Calculation of thread lengths Typical, unless specified in a product standard, dimensions for thread lengths (b) is calculated as follow: for l <= 125 mm: b = 2d + 6mm for 125 mm < l <= 200 mm: b = 2d + 12mm for l > 200mm: b = 2d + 25mm Where l is length of the bolt and b is the threaded part of the bolt. For bolt, where lengths l <= 0.
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ISO 9001:2015 Final Draft International Standard (FDIS) has been issued on 09 July 2015. ISO member countries have 2 months to form a national position and vote on the latest draft of the standard before the 9 September deadline. As there will be a time of up to 3 years to go through approval to the latest version, our company is already closely working on preparations on transition from ISO 9001:2008 to 9001:2015.
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Extracts from standards and technical documentation: BS 4320 / DIN 125-1 Basic dimensions Form A washers for selected sizes BS 4320 Basic dimensions Form G washers for selected sizes BS 4464 Square Spring Washers - Basic dimensions BS 7419 Holding down bolts - Basic dimensions BS EN 14399 Mechanical properties for Washers BS EN 14399-3 Basic bolt dimensions (HR Bolts) BS EN 14399-3 Basic nuts dimensions (HR Nuts) BS EN 14399-3 System HR - Proof Load values for Nuts BS EN 14399-5 Plain washers - Basic dimensions BS EN 14399-6 Plain chamfer washers - Basic dimensions BS EN 14399-7 Basic countersunk bolt dimensions (HR CSK Bolts) BS EN 14399-9 Basic dimensions for Nut Face Washers & Bolt Face Washers BS EN 14399-9 Compression loads for DTI washers BS EN 14399-9 Dimensions of Direct Tension Indicators washers DIN 267 Mechanical properties for Nuts DIN 439/936 Lock Nut (Hexagon Thin Nut) - basic dimensions DIN 6334 Hexagon Stud Connector, Coupling Nut - General specification (coarse thread) DIN 7991 Hexagon socket countersunk head cap screws - basic dimensions DIN 933 Hexagon Setscrew (Screw) - Basic dimensions DIN 934 Hexagon nuts - Basic dimensions DIN 976-1 Basic Dimensions for fully threaded studding, threaded bar, stud bolt DIN 985 Nylon Insert Lock Nut - Basic dimensions ISO 4017 Hexagon head screws - Basic dimensions ISO 4032 Hexagon regular nuts - Basic dimensions ISO 7091 Plain washers - Basic dimensions ISO 888 Thread lengths for ISO metric fasteners (bolts) ISO 898-1 Carbon Steel and Alloy Steel - Bolts, screws and studs ISO 898-2 Carbon Steel and Alloy Steel - Nuts Lindapter FloorFast - basic dimensions Lindapter Hollo-Bolts - basic dimensions Lindapter Lindibolt 2 - basic dimensions Mechanical properties for Austenitic Stainless Steel Nord-lock washers - Dimensions for popular sizes of steel washers Suitability test requirements (BS EN 15048) - CE & UKCA Marking Technical specification for T-head bolts (ANSI/AWWA C111/A21.
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