Practical Maintenance Blog Archive Socket Head Cap Screws. Socket head cap screws are used for applications with limited space. They have cylindrical head and internal wrenching features mostly hexagon socket that allow them to be used in locations where externally wrenched fasteners arent desirable. They are used for critical vehicle applications, machine tools, tools and dies, earth moving and mining machinery, and a wide range of engineering applications. The most important reasons for the increasing use of socket head cap screws in industry are safety, reliability and economy. In this article information is given on 1. Series socket head cap screws, advantages of socket head cap screws, product and dimensions standards, advantages of Unbrako socket head cap screws, information on metric socket head cap screws made by Unbrako as per ANSI standard and countersunk head screws with hexagon socket. Bs En Iso 4762 Din 912 Specification' title='Bs En Iso 4762 Din 912 Specification' />A325 bolts Manufacturer Supplier Manufacting highclass A325 bolts in India Buy A325 bolts, A325 Nuts, A325 Bolts, A325 Screws, A325 washers for perfect connection. Monel 400 Fasteners,provide premier finish of Monel 400 Fasteners,Monel 400 Nuts, Monel 400 Bolts with minimum burr. Collar Eyebolts 2 2 continued However they are in effect hanging on by their fingertips and not strong enough to take the load When the current British Standard was. Series and 1. 96. Series. This term is generally used in America. The original configuration of socket head cap screws didnt maintain consistent relationships among the nominal shank diameter, head diameter, and socket size throughout the available size range. This limited the performance potential of some sizes. In the 1. 95. 0s, one socket screw manufacturer in America performed extensive studies to optimize performance based on geometry, fastener material strength, and applications. These studies resulted consistent dimensional relationships throughout the size range. Eventually, these relationships were accepted as industry standards and the year of acceptance 1. The term 1. 93. 6 Series was selected to identify the older style for replacement requirement. Advantages of socket head cap screws. Manufacturer of high integrity Metric nuts e. Nut Bolt, SS Nuts, Metric hex nuts, Stainless steel 188, 201415 Rate list. TESAs product 1 Finest raw materials 2 Guaranteed precision throughout the measuring range 3 Latest technology 4. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. Vol. 7, No. 3, 200405. Study on Bilinear Scheme and Application to Threedimensional Convective Equation Itaru Hataue and Yosuke Matsuda. Vol. 7, No. 3, May, 2004. Mathematical and Natural Sciences. Study on Bilinear Scheme and Application to Threedimensional Convective Equation Itaru Hataue and Yosuke. The standards for metric, alloy steel socket head cap screws, ASTM A574M also specifies one strength level. This strength level is equivalent to ISO 898 Property. No. name series dwg 1 06dr7180da3670 eng. As compared to ordinary fasteners, less socket screws of the same size can achieve the same clamping force in a joint. As fewer screws are required for a given job, fewer holes are required to be drilled and tapped. There is weight reduction as fewer screws are used. There will be weight reduction on account of smaller size of the component parts since the cylindrical heads of socket screws need less space than hex heads and require no additional wrench space. Product and dimensions standards. Product and dimensions standards used for socket head cap screws in various countries are as under. ANSI ASTM A5. 74, B 1. B 1. 8. 3. 1. M IS 2. ISO 4. 76. 2 DIN 9. BS 2. 47. 0, BS EN ISO 4. Information on ANSI, IS and ISO standard is given below. ANSI Standards. As per ANSI, an alloy steel socket head cap screw means a part made in accordance with ASTM A5. The standard requires that dimensions of product shall conform to the requirement of ANSI B 1. The finished screws shall have hardness and tensile strength as under. Itunes 32 Bit For Ubuntu on this page. Product Size. Hardness, HRCTensile Strength, ksi. The standards for metric, alloy steel socket head cap screws, ASTM A5. M also specifies one strength level. This strength level is equivalent to ISO 8. Property Class 1. The dimensions shall be as per ANSI B 1. M. IS Standards. IS 2. M1. 6 to M3. 6. They are made as per product grade A IS 1. Their threads shall be metric coarse pitch, 6g as per IS 4. The nominal dimensions and preferred length size combination are given in the specification. Their mechanical properties shall be as under. As per property class 1. IS 1. 36. 7, part 3 for steel bolts and As per A2 7. A2 8. 0 for d 2. IS 1. As per the standard, screw shall be designated by nomenclature, thread size, length, number of the standard and material. Thus a hexagon socket head cap screw of size M1. Hexagon Socket Head Cap Screw M1. IS 2. 26. 9 steel. Caution Although the ANSI and IS standard specifies only one strength level, metric socket screws are manufactured around the world to various standards. These standards allow strength levels and materials different from the ANSI and IS standard. For example Property Class 6. MPa only one half of Property Class 1. MPa. Therefore, there are metric socket screws in distribution that look similar but have different strengths. Thus the user of metric socket screws must be aware of the strength level of the fasteners he or she is buying. Purchasing by the simple description metric socket head cap screw can result in one of many strength levels being sold. This can result in undesirable product performance. ISO Standard. Information on ISO standard 4. Material. Class 1. Carbon 0. 2. 0 0. Phosphorous 0. 0. Sulfur 0. 0. 35 maximum and one or more of chromium, nickel, molybdenum or vanadium. Heat Treatment. Class 1. C minimum. Hardness. Rockwell C 3. 9 4. Vickers HV 3. 85 4. Tensile Strength. Nmm. 2 minimum. Proof Load. Nmm. 2 minimum. Elongation. Plating. Class 1. Note. Class 1. 2. U. S. alloy steel socket cap screws. Information on dimensions is as under. Basic. Screw. Diameter. Thread. Pitch. DHKCFSETWBody Diameter. Head. Diameter. Head Height. Top. Chamferor Radius. Fillet. Transition. Diameter. Socket Size. Across the Flats. Socket Size. Across the. Corners. Key. Engage ment. Wall. Thick ness. Max. Min. Max. Min. Max. Min. Max. Max. Max. Min. Min. Min. Min. M1. 6. 0. 3. M2. 0. 4. 2. 0. 01. M2. 5. 0. 4. 52. 5. M3. 0. 5. 3. 0. 02. M4. 0. 7. 4. 0. 03. M5. 0. 8. 5. 0. 04. M6. 16. 0. 05. 8. M8. 1. 2. 58. 0. 07. M1. 01. 5. 10. 0. M1. 21. 7. 51. 2. Windows 8 Professional Rtm. M1. 62. 16. 0. 01. M2. 02. 5. 20. 0. M2. 43. 24. 0. 02. M3. 03. 5. 30. 0. M3. 64. 36. 0. 03. M4. 24. 5. 42. 0. M4. 85. 48. 0. 04. M5. 65. 5. 56. 0. M6. 46. 64. 0. 06. Advantages of Unbrako socket head cap screws. Unbrako has developed and maintained certain manufacturing advantages that continue to set them apart from others. Below is a summary of these advantages. All socket cap screws have forged heads and hex sockets. The ASTM A5. 74 Inch Specifications and the ASTM A5. M Metric Specifications mandate cold or hot formed heads through 1 12 or M2. In all other sizes sizes above 1 or 2. All unbrako socket cap screw heads and their hex sockets are forged. All socket cap screws have rolled threads. The ASTM A5. 74 Inch Specifications and the ASTM A5. M Metric Specifications require rolled threads through 58 diameter and for screw lengths through 4, or respectively with metrics requiring rolled threads through M2. Larger products may be rolled, cut, or ground at the option of the manufacturer. Ground threads are not produced because of excessive costs. But all Unbrako socket cap screws are roll threaded. Higher minimum tensile strengths. The ASTM A5. 74 Inch Specifications and the ASTM A5. M Metric Specifications specify minimum tensile strength of 1. Mega Pascals The corresponding requirements for core hardness are HRC 3. HRC 3. 7 to 4. 5 for 58 sizes and larger. Unbrako tensile specifications are 1. MPa for metric fasteners while maintaining the core hardness range. Radiused root thread runout. At the beginning of 1. MIL S 8. 87. 9, was released. In Revision A of this spec, it stated that the runout threads must have root radii as large or larger than the normal root radius of the threads. Large radius of runout root provides a smooth form that distributes stress and increases fatigue life of thread run out. The purpose of this requirement was to strengthen this specific area of the fastener, because this was where most fastener failures occurred. The initial use of this specification was for aircraft fasteners, and while it certainly proved its worthiness in these applications, it has never been added to any commercial fastener standard. However, Unbrako SPS saw the merits of this technological advancement, embraced this concept, and developed a Radiused Root Runout as a standard feature on all of their socket cap screws. WR Thread Form. This is an SPS proprietary thread form that fits within the standard UNR thread profile. WR stands for WIDE ROOT. This unique thread form has two major differences, and they are both achieved with special thread roll dies made by their Hi Life Tool division. First, the root of the thread is made as wide as the Unified Screw Thread Series permits.