Active standard astm a574 developed by subcommittee. Fastener basics page 1 copyright 20002019 bolt depot inc. Longer caps are easier to see when fastened, while button and flat head caps are less apt to snag. From the original jeepl list to the xjlist to the board, a. With a deeper drive than flat and rounded head screws, socket head screws withstand more torque for a tighter hold. Standards for bolt strength grades are set according to a system devised by the society of automotive engineers. Grainger has the hex head cap screws, nuts, washers and other fasteners you need for machine maintenance and general construction. Our astm a574 nut bolts hex bolts, tab bolts, flange bolts, carriage bolts, shoulder bolts and t head bolts are used to attach machine threaded fasteners when joining materials together.
Astm, sae and iso grade markings for steel fasteners. Astm a574 bolts, astm a574 alloy steel socket head cap. A complete range of unbrako stainless steel fasteners including socket head screws, hex head screws and nuts. In fact, the bolt diameter is a little smaller and the nut diameter a little larger. For metric m5 and larger, the property class and manufacturers i. These numbers have no quantitative relationship to strength properties, except that increasing numbers represent increasing tensile strengths.
All holokrome products are made in the usa and used in a wide variety of market application which demand highquality, highstrength precision components. The tightening torque will change, if fixing takes place with materials. Lb is the minimum body length and is the length of the unthreaded cylindrical portion of the shank. For alloy socket screws, yield strength is 180 ksi until 12. Bolt torque specs for socket head cap screws for machine. Hex head cap screws, used to join two or more parts together, come in different sizes and grades. They have a round cap with a hex head and are tightened with a socket wrench drive. Zinc plated alloy steel is most often available in grade a, grade c, grade 2, grade 5 and grade 8. Service manual supplement july 2016 fastener torque specifications 4 sae and metric fastener torque specifications sae plain and zinc plated hex and socket head cap. The basic thread lengths lt listed directly below the nominal sizes in the table above represents the nominal length up to which all screws of that diameter shall be fully threaded. Applications ideal for precision assembly work with close tolerances and applications needing a well tooled appearnace. It is suggested that the user verify performance for critical applications. Choose the right cap head for your specific application. Boltport can manufacture both metric and inch sized hexagon socket head cap screws for high strength application with reference to astm a574 specification.
An astm designation number identifies a unique version of an astm standard. Unbrako fasteners known for quality, safety and innovation for over 100 years, are now available in 304 and 316 stainless steel ad 2000 merkblatt wo certified. Steel grade sae 5 sae 8 socket head cap screws property class 8. Socket head cap bolt 41 grade mark reference standards. Socket head cap screws are commonly used in machine assembly, especially for removable panels and parts.
The three grades 36, 55 and 105 designate the minimum yield strength ksi of the anchor bolt. Torq bolt manufactures astm a574 bolts, a574 aisi 4037 bolts to your custom specifications, and we guarantee to meet your delivery schedule. Metric has two strength levels, property classes 12. Astm a574 17 standard specification for alloy steel socket.
In general the proper torque spec is usually around 6570% of the failure torque rate. Proper torque spec varies depending on the material, bolt grade or wether lubrication is used such as oil, wax, or antiseize always go. Mechanical properties proof loadpsi yield strength min psi tensile strength min psi nogrademark sae j429 grade 1 bolts, screws, studs low or medium carbon. Fastener warehouse is a wholesale distributor of industrial grade fasteners and construction supplies for construction, industrial, marine, and auto industries. The above specification is for coarse threads only. Proper torque spec varies depending on the material, bolt grade or wether lubrication is used such as oil, wax, or antiseize always go to the manufacturer for proper torque specs if needed. Zinc plated alloy steel is a common material that fasteners are manufactured in. Bolt grades i have been on a quite a few online email lists over the last 7 years or so, basically since they first came out. It is made of alloy steel and has six radial lines on the top of the bolt head. Standard specification for alloy steel sockethead cap screws.
Sae plain and zinc plated hex and socket head cap screws 4 metric plain and zinc plated hex and socket head cap screws 8 sae coated hex head and socket head cap screws. Alloy steel is highly hardened and usually black oxide andor oil coated, o. Lubricate all contact areas of the bolts and washers. Elongation after of screw range permanent strain fracture. A domed head sits above the surface of your material. Table 3 suggested torque values and clamp loads for sae. Lubrication added to a dry bolt will typically reduce the torque value 1525%.
Quality is frequently defined as conformance to specification, and at holokrome a great deal of effort is expended in ensuring that the products shipped do. Performance data listed are for standard production items only. Supplies greater tensile strength than equivalent sizes of grade 5 or grade 8 hex head cap screws while requiring less surface area or counterbore since the fastener is. Holokrome socket head cap screws contribute in important ways in carrying out modern design techniques which call for smooth contours and surfaces, elimination of clumsy, bulky parts and use of lighter constructions as they apply to flanges, lugs, pockets, and cover plates. Socket head cap screw specifications smith fastener. Socket head cap screw shcs screw and bolt dimensions, hole.
Astm a574m is a complete metric companion to specification astm a574. Astm a307 grade b is a special low carbon steel grade of bolt used in piping and flange work. Install in a counterbored hole or above the surface. Below is a list of bolt torques compiles from various machine tool manufacturers. This specification covers complete requirement for quenced and tempered high strength alloy steel hexagon socket head cap screws, 0. In addition to the indicated grade marking, all grades, except a563 grades o, a and b, must be marked for manufacturer identification. Critical application fasteners since its formation in 1929, holokrome has been at the forefront of fastener development and innovation. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch. Glossary of fastener terms the bolt supply house ltd. The markings shown for all grades of a194 nuts are for cold formed and hot forged nuts.
Astm a574 standard specification for alloy steel socket head cap screws. Socket head cap screws unbrako precision high grade. Nonstock items may vary due to variables in methods of manufacture. Grainger approved fastener tech sheet, screw and bolt heads. Alloy steel socket head cap screws will most likely have a greater strength than sae grade 8 unless their manufacturer says otherwise. Flat and oval head screws are angled under the head to. One advantage cap screw fasteners have over welds or rivets is that they allow for easy disassembly for repairs and maintenance. For metric bolts strength is according iso 898 mechanical properties of fasteners made of carbon steel and alloy steel described by property classes with designations 4. To determine the threaded portion of the screws with a nominal length greater. Contact american fastener with any questions or for a custom quote. Corrosion resistance of special grade a2 and a4 stainless steel.
The screws shall be fabricated from steel made to fine grain practice and shall be alloy steel. This specification covers the requirements for quenched and tempered alloy steel sockethead cap screws. Identifying bolt grades and head markings for us grades 2, 5 and 8. The markings shown for all grades of a194 nuts are for cold formed and hot forged. Socket head cap screws metric body and grip lengths. We provide both stocked and custom anchor bolts, anchor bolt assemblies, threaded rod, bolts, bent bolts, nuts, washers, turnbuckles, clevises and more. Browse metric socket head cap screws din 912 in the coburnsmyers online catalog and search by type, diameter, pitch, length, material and finish. Astm a574a574m covers chemical, mechanical, tensile, wedge test requirement, etc. The information available from our sources is usually sufficient for all computer related drill or screw requirements world wide. These hightensile fasteners offer excellent corrosion resistance. Download a complimentary pdf of our fastener markings chart. Astm a574 hex cap screws also known as machine bolts or hex bolts are available in various bolt grade markings and strengths. Some of our customers do have unique shear strength requirements that can only be satisfied by grade 10.
Astm a574 bolts manufacturer, astm a574 hex bolts, astm a574 12point bolts, astm a574 grade aisi 4037 bolts, astm a574 aisi 4042 bolts supplier, astm a574m socket head cap bolts, astm a540 grade aisi 4340 bolts, grade aisi 8740 bolts manufacturer in mumbai, india. Screws round head screws 11 various head styles machine scerws 12 to 123 tapping screws approx. A grade 8 bolt is stronger than the more commonly used grade 5. Fully threaded hex bolts are also known as tap bolts. Suggested seating torque values, only apply to metric grade 12. When nuts are machined from bar stock the nut must be additionally marked with the letter b. Socket head cap screws 51 button head and flat head socket cap screws 52. Z socket head cap screw, grade 8, zinc the information below lists the required dimensional, chemical and physical characteristics of the products in this purchase order. The most important reasons for the use of socket head cap screws in industry are safety, reliability and economy. Grade marking required markings astm a 193 grade b8 class 1 regular series and heavy series. But neither the external threads of the bolt nor the internal threads of the nut are exactly.
Socket head cap screw shcs screw and bolt dimensions, hole size, counter bore size, head measurement, body dimensions, shcs hex socet size, shcs allen wrench size. Metric steel bolts grades and property classes metric steel bolts, screws and studs proof and tensile strength. Grade 2 requirements for sizes 14 through 34 in apply only to bolts and screws 6 in. The greater the steels tensile strength, the more torque the bolt can take and the tighter the bolted joint will be. The bolts can either be cut or roll threaded and a weldable grade. Socket head cap screw markings fasteners, bolts, screws. For example, a bolt and nut may be described as being. Grades of fasteners in the sae system, grades are designated by numbers from 1 through 8. From the original jeepl list to the xjlist to the board, a common question comes. Zinc plating creates corrosion resistance and gives the bolts a shiny finish. Includes screws such as pan, button, binding, and truss head screws.
Inch socket head cap screws 1960 series continued nominal screw diameter nominal screw length length tolerances 716 through 34 through 1 inch 0. It is a mandatory requirement in sae and astm standards that fasteners of the medium carbon and alloy steel strength grades be marked for grade identification. Mmcc stocks socket head cap screws in the standard grades 8. Performance data listed is for standard production items only. Quick and easy online shopping for grade 8 hex bolts hex head cap screws with coarse uss thread. An externally threaded fastener with a sixsided head that is wider than that of a standard hex bolt. Looking for grainger approved fastener tech sheet, screw and bolt heads 5dff0. Lubricated refers to fasteners in the as received condition, which is normally a light preservative oil coating on unplated fasteners and no oil coating on plated fasteners. Socket head cap screw size chart if all else fails, you may want to use our drill size conversion table or our tap drill size calculator. Identification grade mark specification fastener description material nominal size range in. Alloy socket head cap screws, inch series barnhill bolt. Threaded bolt stress area threaded bolts tensile stress area.
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