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Category: Mechanical Fastening & Fixings

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  1. Shear and Tension Capacity of stainless steel bolts

    This article covers how to design stainless steel bolts (fasteners) subject to shear and tension forces. Shear and tension capacities for bolts of property class 50, 70 and 80 from diameter M10 to M24 are given. (207)

  2. Stainless Steel BSENISO 3506 Fastener Grades A1, A2, (A3), & A4 (A5)

    BSENISO 3506 replaces BS6105. Part 1 covers bolts, screw and studs, part 2 nuts and part 4 tapping screws. The chemical compositions are common to the various parts. Austenitic grades A1 A2 and A4 are shown and compared to bar grades 303 304 349S17 316 and 394S17. Mechanical properties for property class 50 70 and 80 austenitic bolts and studs and property class 20H 25H 30H and 40H tapping screws are tabulated and the fastener designations, such as A2-70 and A4-25H described. Duplex FA (ferritic-austenitic similar to 1.4462 (2205) of EN 10088-1) is a likely future grade for inclusion in the standard. Fastener grade selection is covered in annexes to the standards. The standards lists grades 1.4439 1.4539 (904L) 1.4529 (6% molybdenum austenitic) and 1.4462 (2205) as suitable for reducing the risk of chloride induced stress corrosion cracking failures in applications such as indoor swimming pools.

  3. Tightening torques for stainless steel bolts

    Maximum breaking torque values for property class 50, 70 and 80 austenitic fastener grades A1, A2, A3 A4 and A5 taken from BS EN ISO 3506-1 are shown. A link is provided to the Bulten Stainless web site where maximum tightening torque, yield load and failure load for austenitic stainless steel fasteners are tabulated.

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