briquetting machine 1/4 28x5/8

steel press machines | ruf briquetting systems

Whether in mechanical engineering, the automotive industry, aviation, steelworks or foundries: steel chips accure in many machining processes. They are usually contaminated with cooling lubricants like oil or emulsions and often have low bulk densities.

By briquetting alloyed (stainless steel) and/or unalloyed chips you streamline internal logistics, save storage space and costs and also recovers expensive cooling lubricants. A briquetting press for steel chips is therefore not only an ecological but also an economical alternative for chip processing.

Our hydraulic briquetting presses operate with a specific pressing power of up to 5,000 kg/cm and are suitable for a wide range of steel types (e.g. stainless steel, structural steel, machining steel, case hardened steel, X5CrNi18-10, tool steel, V2A & V4A, heat treatable steel or duplex steel). In each case the result is compact briquettes.

In the field of stainless steel machining, the customer produces for various industrial sectors such as measuring and control technology. The steel chips which accrue in the continuous 3-shift operation are reduced to small pieces directly at the processing machine and briquetted at once. This way, the different alloys can be cleanly separated, in order to achieve the highest possible marketing revenue. In addition, pressed out cooling lubricants are directly returned to the cooling lubricant circuit of the processing machine and chip logistics is significantly minimized right at the point of chip accrual. The customer now uses 18 individual RUF briquetting systems. The first one has already been in operation since 2009 and still impresses with its high uptime.

Christ & Heiri produce fine gearing parts of the highest precision. In this process, brass as well as steel alloys are processed. In the past, centrifuges and also competitor briquetting systems were used for chip processing. Two RUF systems replaced these in 2018, one for briquetting brass chips, the other one is used for steel chips. The machines convince with their low space requirements, high oil recovery rates and reliable operation combined with locally provided high-quality service.

With now two briquetting systems Lauble GmbH is enormously simplifying the handling of steel chips which accrue during the production of precision-turned parts. By switching from centrifuging to pressing, space is saved, large skip containers are not needed and at the same time forklift traffic is reduced considerably. The steel chips which are compacted into briquettes are largely dry, because pressing the chips reduces the amount of adhering cutting oil from 10-15 to three percent. The pressed out cutting oil is treated in order to be reused in the company's turning centres.

At the production plant the time needed in every shift to handle loose chips with about 16 chip trolleys was exactly analysed. It was very long. Briquetting significantly reduces the effort required for chip logistics. This is achieved with a machine equipped with a lift and tilt device and a slat-band chain conveyor for discharging the briquettes into a container. Thus 100-120 tons of steel chips per month are processed automatically, saving 60 man-hours monthly (which were previously needed for internal chip logistics). Furthermore, an additional revenue of 10 EUR per ton of briquettes is achieved. In order to prevent premature wear, high quality wear parts are used. Since its commissioning 2.5 years ago, the plant has run for about 7,000 hours.

In general, almost all materials can be made into briquettes. However, the chip particles should not be bigger than 50mm. The chips should not contain any impurities. For Wood & Biomass the moisture content should be less than 12 % (max 15 %).

We have many years of experience in briquetting which means that our experts are well-qualified to provide you with professional advice in choosing the right briquette press. We work with you to identify your individual requirements on the basis of the material in question and the production conditions. This then allows us to offer you custom-made briquetting machines or even complete briquetting solutions.

In addition to our briquette presses, we also offer additional peripheral equipment, such as conveyors, silos or chip hoppers. These allow the material flow of your chips to be optimised, and RUF peripheral devices can also be used to enable the briquetting of your chips to be fully-automated. Your briquette press will always be individually custom-made in accordance with your specific requirements.

wood briquette machine | ruf briquetting systems

The RUF wood briquette machine forms briquettes from your wood chips to enable profitable sales. The LIGNUM wood chip briquette machine range has the flexibility to process various different grain sizes of the material into briquettes of a consistently high density and quality. The LIGNUM range works with a very high level of energy efficiency thanks to our innovative RUF hydraulics. Due to its compact structure, the sawdust press is easy to incorporate into existing production processes and is suitable for 24h operation.

Thanks to the great number of wood chip machines we have sold, RUF briquettes are popular all over the world as a sustainable, high-quality fuel. A consistent length and a constant weight of the briquettes can largely be ensured, even with different bulk densities, through our highly developed system of briquette length regulation. To be able to press wood chips, it is important that the water content of the material is below 15%. Depending on customer requirements, we offer wood briquette machines for throughputs between 410 and 1,050 kg per hour.

"This is the perfect solution to our handling and space problems. And the waste aluminium in the compact briquette shape largely cleaned of the cooling lubricant emulsion achieves a higher profit when sold on ."

"First and foremost I am impressed by the good price-performance ratio, the quality and the reliability of the machines. Besides I truly appreciate the excellent personal relationship I have experienced with the family business and their Senior Director Hans Ruf from day one."

"Our collaboration with company RUF has started in 2002 and has been successful through all these years. RUF is not just a world known machinery producer name and the leader in briquetting technologies market. RUF is your trustful business partner as it has been a reliable and supporting partner for us during both periods of the sales peaks and during market depression. Its our luck to have the same business philosophy with our main business partner the RUF company. When both of you have the same aim, you achieve it faster!"

"We do not have one unsatisfied customer with a RUF machine and we have sold some 40 systems here in Australia and New Zealand. That in itself speaks volumes for the RUF company and its equipment. In our opinion the RUF briquette press cannot be matched from a performance basis. Although it is more expensive than most competing machines from a capital cost point of view, the ongoing trouble free performance and maintenance of the RUF machines put them well ahead of the opposition."

The merger of RUF and C.F. Nielsen means that the worlds biggest range of solutions from a single provider has been opened up to users of briquetting machines: Hydraulic Briquetting Systems (rectangular briquettes), Mechanical Briquetting Systems (round briquettes) und Extruder Briquetting Systems (dense briquettes suitable for carbonization) Almost irrespective of the throughputs that are needed, the quality of the material and chips, and the production conditions that prevail we can always find the optimal briquetting solution in order to bring the greatest possible benefit to our customers.

In general, almost all materials can be made into briquettes. However, the chip particles should not be bigger than 50mm. The chips should not contain any impurities. For Wood & Biomass the moisture content should be less than 12 % (max 15 %).

The costs of a briquette press depend on various factors, such as the starting material, required throughput and briquette density. Our experts will be happy to advise you on a one-to-one basis and can draw up a non-binding quote.

ruf 4-11 | ruf briquetting systems | ruf brikettierpressen und brikettiersysteme hersteller

Unsere Our RUF 4-11 metal press series is best suited to small to medium quantities of metal chips. The value of your metallic residues can be increased through the process of briquetting. At the same time, expensive cooling lubricants are recovered, which our briquette presses squeeze out of the damp metal chips. The throughput is between 40 and 300 kg/hour, depending on the material to be briquetted. The briquette machines can be adapted to your individual requirements.

In addition to our briquette presses, we also offer additional peripheral equipment, such as conveyors, silos or chip hoppers. These allow the material flow of your chips to be optimised, and RUF peripheral devices can also be used to enable the briquetting of your chips to be fully-automated. Your briquette press will always be individually custom-made in accordance with your specific requirements.

briquetting - an overview | sciencedirect topics

Briquetting is a way to make use of biomass residues that would otherwise go to waste, and replace the use of wood and charcoal (often produced unsustainably) as well as fossil fuels, thus cutting greenhouse gas emissions.

Briquetting is a compaction technology that has been around for many years. Fines are pushed into the nip of two counter-rotating wheels using a screw or gravity feeder. High hydraulic pressure is applied and the rotating wheels compress the feed between the pockets to form briquettes. Unlike pelletization, briquetting does not always require a binder, but generally some amount of molasses, starch, or tar pitch is used. A traditional application for briquetting is the agglomeration of coal.

Most applications of briquetting in the iron and steel industry involve waste materials, such as mill scale and process dusts, sludges, and filter cakes [27]. In the DR industry, a number of facilities briquette their hot DRI product to produce a higher-density product for safer shipping. This material is known as HBI (hot briquetted iron), as discussed in Section 1.2.3.

Briquetting machines, with dies and punches, driven by a single bullock, have been developed by the School of Applied Research in Maharashtra, India. They cost about US$ 2400 each. The machine is very sturdy but the problem is the limited maximum production 25 kg/hr and the price of the equipment.

The same school has also developed a briquetting machine with two plungers driven by a 3 horse powermotor. The maximum capacity is 100 kg/hr and the price about US$ 4000. However, the pressure on the briquettes is not very high and it is necessary either to use a binder or to handle the briquettes with great care.

GAKO-Spezialmaschenen in West Germany produces briquetting equipment that uses the piston extruder compacting method and produces good quality briquettes because of the high pressure although this results in higher prices and power consumption. A 150 kg/hr machine costs about US$ 12 900 and a 60 kg/hr machine about US$ 8800 and requires a power load of 8.5 kW.

T & P Intertrade Corporation Ltd in Thailand markets a press-screw system briquetter that heats the agro-waste before compression. This means that good briquettes can be produced without needing a binder and at lower pressure, resulting in cheaper equipment. Their Ecofumac has a capacity of about 150 kg/hr, needs a 15 hp motor and three 2000 watt heaters and costs about US$ 5850. The grinder needs a 5 hp motor. Unfortunately a lot of energy is used by the heaters and there have also been some problems with other components.

It can be seen, therefore, that even if equipment does exist, the problems are not totally solved. Either equipment is too expensive with little capacity and too high an energy use, or poor quality briquettes result. There is still a need for a medium-size briquetting machine that is inexpensive, easy to operate, repairable using local tools and commonsense, energy efficient, reliable and which can handle different types of raw material. The advantage of medium-sized equipment is that capital investment is low and mechanized drying and special storage space is not required. In addition it would be practical for use in villages and in places with small wood industries or small agro-industries like groundnut oil mills, sugar mills, saw mills and paper mills. The briquettes could be used locally in bakeries, brickworks, potteries, curing houses, breweries, drieries or simply for cooking.

Briquetting is like pelletising a process in which the raw material is compressed under high pressure, which causes the lignin in the wood or biomass to be liberated so that it binds the material into a firm briquette.

The most appropriate water content in the raw material for briquetting varies and depends on the raw material. However, the normal water content is between 6% and 16%. If the water content is over 16% the quality of the briquettes will be reduced, or the process will not be possible.

There are hydraulic presses for small capacities from 50 to 400kg/hour. The raw material is fed into the press by a time-controlled dosing screw, which means that it is the volume of the raw material and not the weight, which is controlled. Briquettes have a fairly good uniform length (square briquettes) and they are mainly used by domestic consumers.

Mechanical presses are available with capacities from 200kg/hour up to 1800kg/hour. Briquettes from these presses are normally round and short and they are used in heating plants for larger industries and for district heating plants. A mechanical press is built like an eccentric press. A constantly rotating eccentric connected to a press piston presses the raw material through a conic nozzle. The required counter pressure can be adjusted only by using a nozzle with a different conicity. A mechanical press receives raw material from a speed-controlled dosing screw. The speed of the dosing screw determines the production rate of the press. A change in the specific gravity of the raw material will change the hardness of the briquettes. A mechanical briquetting press will produce a long length of material a briquette string which, however, breaks into random lengths depending on the binding capacity of the raw material. A saw or cutter is used to cut the briquette string into briquettes of uniform length.

The briquette string pushed out of the press is very hot because of the friction in the nozzle. The quality of the briquettes depends mainly on the cooling and transport line mounted on the press. A cooling/transport line of at least 15m is recommended for wood briquettes. The longer the time a briquette remains in the cooling line the harder it will become. Cooling lines up to 50m long are common.

Biomass briquetting technology can compress some biomass raw materials, such as wood shavings, sawdust, crop straw, and other solid waste biomass fuel through pressurizing and heating. It is conducive to the transportation, storage and combustion and can largely improve the efficiency of combustion and fuel utilization. At present, there are three main types of solid shaping, including screw extrusion, piston punch, and roller forming.

Thermochemical conversion involves biomass structure degradation with oxygenic or anoxygenic atmosphere at high temperature [100]. It includes three kinds of technology, namely biomass gasification, biomass pyrolysis, and direct liquefaction.

Biomass gasification is a chemical reaction process that reacts with gasifying agent (air, oxygen, and water) at high temperatures in gasifiers. The main problem of biomass gasification technology is that the tar obtained in the gasification of gas is difficult to purify, which has become the main factor restricting the biomass gasification technology.

Pyrolysis is a thermal process in which the organic polymer molecules in the biomass are quickly broken into short chain molecules, coke, bio-oil and noncondensable gas in the absence of oxygen or a small amount of oxygen under high temperatures. Biomass liquid fuel could provide an alternative to petroleum up to a certain extent. After some modification, industrial oil fired boilers and internal combustion engines can use bio-oil as fuel directly.

Burning biomass to obtain heat energy, as a direct utilization mode, has been more and more widely employed based on the mature experiences during development of fossil fuel power plants. When biomass is used as the boiler fuel, its thermal efficiency is close to the level of fossil fuels. Compared with fossil fuels, for example, coal, biomass fuel contains more hydrogen element, is more volatile, and has less carbon and sulfur content.

Bioconversion technology of biomass refers to the process by which microorganisms produce high-grade energy through biochemical action with agricultural and forestry wastes. Anaerobic fermentation and ethanol fermentation are the two main conversion types. With the help of anaerobic bacteria, organic matter can be converted to combustible gas, for example, methane under a certain temperature, humidity, pH, and anoxygenic conditions. The ethanol is produced by microzyme with the carbohydrate hydrolyzed by enzymes.

Renewed interest in briquetting coal has arisen because of (i) the increasing amounts of fine coal being generated in mining and preparation which are stockpiled or disposed of in tailings dams and lead to uneconomic land use and environmental problems; (ii) the need for easily handled and convenient coal products; and (iii) the demand for smokeless solid fuels.

Briquette quality depends on composition (type of coal and binder), particle sizes and processing conditions. In this study various data are presented on the influences of such factors on mechanical strength and water resistance of briquettes formed from high rank coals using a molasses/lime binder alone and also including bagasse. These data relate to Hardgrove grindability index (HGI), coal size, moisture and curing time.

White Energy developed the BCB technology at pilot scale in Australia, after initial work by CSIRO. In partnership with Bayan Group, White Energy formed PT Kaltim Supa Coal, and constructed a commercial scale 1 Mtpa plant at Tabang in East Kalimantan. The BCB process takes 4200 kcal/kg GAR feed and produces a 6100 GAR product. Its difference from Kobelcos UBC process is that BCB does not use any binder to reconstitute the dried product.

This project has been terminated due to commercial differences between the partners. The financial model used a sub-20 coal price delivered from mine mouth to plant. Bayan Group changed the price to follow the Indonesian Reference Price which more than doubles the feedstock cost. The parties are in negotiations to settle the dispute (White Energy, 2011).

Generally, briquette manufacture (briquetting) involves the collection of combustible materials that are not usable as such because of their low density, and compressing them into a solid fuel product of any convenient shape that can be burned like wood or charcoal. Thus the material is compressed to form a product of higher bulk density, lower moisture content, and uniform size, shape, and material properties. Briquettes are easier to package and store, cheaper to transport, more convenient to use, and their burning characteristics are better than those of the original organic waste material.

The raw material of a briquette must bind during compression; otherwise, when the briquette is removed from the mold, it will crumble. Improved cohesion can be obtained with a binder but also without, since under high temperature and pressure, some materials such as wood bind naturally. A binder must not cause smoke or gummy deposits, while the creation of excess dust must also be avoided. Two different sorts of binders may be employed. Combustible binders are prepared from natural or synthetic resins, animal manure or treated, dewatered sewage sludge. Noncombustible binders include clay, cement, and other adhesive minerals. Although combustible binders are preferable, noncombustible binders may be suitable if used in sufficiently low concentrations. For example, if organic waste is mixed with too much clay, the briquettes will not easily ignite or burn uniformly. Suitable binders include starch (5%10% w/w) or molasses (15%25% w/w) although their use can prove expensive. It is important to identify additional, inexpensive materials to serve as briquette binders in Kenya and their optimum concentrations. The exact method of preparation depends upon the material being briquetted as illustrated in the following three cases of compressing sugar bagasse, sawdust, and urban waste into cooking briquettes.

Rural villages in developing countries are connected to the drinking water supply without a sewer system. Other places in urban and semi-urban communities have no sewage treatment networks. Instead under each dwelling there is a constructed septic tank where sewage is collected or connected directly to the nearest canal through a PVC pipe. Some dwellings pump their sewage from the septic tank to a sewer car once or twice a week and dump it elsewhere, usually at a remote location.

In general, a huge amount of sewage and solid waste, both municipal and agricultural are generated in these villages. Because of the lack of a sewer system and municipal solid waste collection system, sewage as well as garbage are discharged in the water canals. This and the burning of agricultural waste in the field cause soil, water, and air pollution as well as health problems. Some canals are used for irrigation, other canals are used as a source of water for drinking.

Rural communities have had agricultural traditions for thousands of years and future plans for expansion. In order to combine the old traditions with modern technologies to achieve sustainable development, waste should be treated as a byproduct. The main problems facing rural areas nowadays are agricultural wastes, sewage, and municipal solid waste. These represent a crisis for sustainable development in rural villages and to the national economy. However, few studies have been conducted on the utilization of agricultural waste for composting and/or animal fodder but none of them has been implemented in a sustainable form. This chapter combines all major sources of pollution/wastes generated in rural areas in one complex called an eco-rural park (ERP) or environmentally balanced rural waste complex (EBRWC) to produce fertilizer, energy, animal fodder, and other products according to market and need.

The idea of an integrated complex is to combine the above-mentioned technologies under one roof, a facility that will help utilize each agricultural waste with the most suitable technique that suits the characteristics and shape of the waste. The main point of this complex is the distribution of the wastes among the basic four techniques animal fodder, briquetting, biogas, and composting (ABBC) as this can vary from one village to another according to the need and market for the outputs. The complex is flexible and the amount of the outputs from soil conditioner, briquettes, and animal food can be controlled each year according to the resources and the need.

Based on the above criteria, an environmentally balanced rural waste complex (EBRWC) will combine all wastes generated in rural areas in one complex to produce valuable products such as briquettes, biogas, composting, animal fodder, and other recycling techniques for solid wastes, depending upon the availability of wastes and according to demand and need.

The flow diagram describing the flow of materials from waste to product is shown in Figure 7.2. First, the agricultural waste is collected, shredded, and stored to guarantee continuous supply of waste into the complex. Then according to the desired outputs the agricultural wastes are distributed among the basic four techniques. The biogas should be designed to produce enough electrical energy for the complex; the secondary output of biogas (slurry) is mixed with the composting pile to add some humidity and improve the quality of the compost. And finally briquettes, animal feed, and compost are main outputs of the complex.

The environmentally balanced rural waste complex (EBRWC) shown in Figure 7.3 can be defined as a selective collection of compatible activities located together in one area (complex) to minimize (or prevent) environmental impacts and treatment cost for sewage, municipal solid waste, and agricultural waste. A typical example of such a rural waste complex consists of several compatible techniques such as animal fodder, briquetting, anaerobic digestion (biogas), composting, and other recycling techniques for solid wastes located together within the rural waste complex. Thus, EBRWC is a self-sustained unit that draws all its inputs from within the rural wastes achieving zero waste and pollution. However, some emission might be released to the atmosphere, but this emission level would be significantly much less than the emission from the raw waste coming to the rural waste complex.

The core of EBRWC is material recovery through recycling. A typical rural waste complex would utilize all agricultural waste, sewage, and municipal solid waste as sources of energy, fertilizer, animal fodder, and other products depending on the constituent of municipal solid waste. In other words, all the unusable wastes will be used as a raw material for a valuable product according to demand and need within the rural waste complex. Thus a rural waste complex will consist of a number of such compatible activities, the waste of one being used as raw materials for the others generating no external waste from the complex. This technique will produce different products as well as keep the rural environment free of pollution from the agricultural waste, sewage, and solid waste. The main advantage of the complex is to help the national economy for sustainable development in rural areas.

A collection and transportation system is the most important component in the integrated complex of agricultural waste and sewage utilization. This is due to the uneven distribution of agricultural waste that depends on the harvesting season. This waste needs to be collected, shredded, and stored in the shortest period of time to avoid occupying agricultural lands, and the spread of disease and fire.

Sewage does not cause transportation problems as it is transported through underground pipes from the main sewage pipe of the village to the system. Sewage can also be transported by sewage car which is most common in rural areas since pipelines may prove expensive.

Household municipal solid waste represents a crisis for rural areas where people dump their waste in the water canals causing water pollution or burn it on the street causing air pollution. The household municipal solid waste consists of organic materials, paper and cardboard, plastic waste, tin cans, aluminum cans, textile, glass, and dust. The quantity changes from one rural community to another. It is very difficult to establish recycling facilities in rural areas where the quantities are small and change from one place to another. It is recommended to have a transfer station(s) located in each community to separate the wastes, and compact and transfer them to the nearest recycling center as explained in Chapter 5. The transfer station consists of a sorting conveyer belt that sorts all valuable wastes from the organic waste, which is then compacted by a hydraulic press. The collected organic waste can be mixed with other rural waste for composting or biogas as explained above.

The outputs of the EBRWC are valuable and needed goods. EBRWC is flexible and can be adjusted with proper calculations to suit every village; moreover inputs and outputs from the complex can be adjusted every year according to the main crops cultivated in the village, which usually varies from year to year. The key element to the success of this solution lies in the integration of these ABBC technologies to guarantee that each type of waste is most efficiently utilized.

The four corner stone technologies for agricultural waste are animal fodder, briquetting, biogas, and composting (ABBC technologies). These technologies can be developed based on demand and need. In principal three agricultural waste recycling techniques can be selected to be the most suitable for the developing communities. These are animal fodder and energy in a solid form (briquetting) or gaseous form (biogas) and composting for land reclamation. There are some other techniques, which might be suitable for different countries according to the needs such as gasification, fiber boards, pyrolysis, etc. These techniques might be integrated into a complex that combine them altogether to allow 100% recycling for the agricultural waste. Such a complex can be part of the infrastructure of every village or community. Not only does it allow to get rid of the harms of the current practice of agricultural waste, but also of great economical benefit.

The amount of agricultural waste varies from one country to another according to type of crops and farming land. These waste occupies the agricultural lands for days and weeks until the simple farmers get rid of these waste by either burning it in the fields or storing it in the roofs of their houses; the thing that affects the environment and allows fire villages and spread of diseases. The main crops responsible for most of these agricultural wastes are the rice, wheat, cotton, corn, etc. These crops were studied and three agricultural waste recycling techniques were set to be the most suitable for these crops. The first technology is animal fodder that allows the transformation of agricultural waste into animal food by increasing the digestibility and the nutritional value. The second technology is energy, which converts agricultural wastes into energy in a solid form (briquetting) or gaseous form (biogas). The briquetting technology that allows the transformation of agricultural waste into briquettes that can be used as useful fuel for local or industrial stoves. The biogas technology can combine both agricultural waste and municipal waste water (sewage) in producing biogas that can be used in generating electricity, as well as organic fertilizer. The last technology is composting, that uses aerobic fermentation methods to change agricultural waste or any organic waste into soil conditioner. The soil conditioner can be converted into organic fertilizer by adding natural rocks to control N: P: K ratio, as explained before. Agricultural waste varies in type, characteristics and shape, thus for each type of agricultural waste there is the most suitable technique as shown in Figure 13.28.

A complex combining these four techniques is very important to guarantee each waste has been most efficiently utilized in producing beneficial outputs like compost, animal food, briquettes and electricity. Having this complex will not only help the utilization of agricultural waste, it will help solving the sewage problem as well that face most of the developing countries, as a certain percentage of the sewage will be used in the biogas production and composting techniques to adjust carbon to nitrogen ratio. An efficient collection system should be well designed to collect the agricultural waste from the lands to the complex in the least time possible to avoid having these wastes occupying agricultural land. These wastes are to be shredded and stored in the complex to maintain continuous supply of agricultural waste to the system and in turns continuous outputs.

china briquette machine, briquette machine manufacturers, suppliers, price

China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including but not limited to: sawdust briquette machine, briquetting machine, charcoal briquette machine. Here we are going to show you some of the process equipments for sale that featured by our reliable suppliers and manufacturers, such as Briquette Machine. We will do everything we can just to keep every buyer updated with this highly competitive industry & factory and its latest trends. Whether you are for group or individual sourcing, we will provide you with the latest technology and the comprehensive data of Chinese suppliers like Briquette Machine factory list to enhance your sourcing performance in the business line of manufacturing & processing machinery.

1/4-28x5/8 170m psi 12 point flange screw plain finish | earnest machine products

You call them Ferry Cap Screws, Counterbore Screws, or Double Hex Screws. We call them 12 Point Flange Screws. Used in many industries, theyre used primarily in diesel motors. The 12 points on the head prevent the edges from rounding out better than the hex head. Earnest carries Grade E9, stronger than Grade 8, to withstand rough conditions. This also allows for the screws to be more securely fastened and used more than once.