![]() International Organization for Standardization. ^ ISO 261:1998 ISO general purpose metric screw threads – General plan.^ ISO 68-1:1998 ISO general purpose screw threads – Basic profile – Part 1: Metric screw threads.Table 3: The market share of each screw thread, p. ^ ISO/TC/ 1 Business Plan,, Version 1.3.Unified Thread Standard (UTS, UNC, UNF, UNEF and UNS) – a US/Canadian/British thread standard that uses the same 60° profile as metric threads, but an inch-based set of diameter/pitch combinations.British Standard Whitworth (BSW) – a British thread standard with 55° profile.ANSI/ASME B4.2-1978 (R2009): Preferred Metric Limits and Fits.ANSI/ASME B1.13M: Metric Screw Threads: M Profile.Other (usually smaller) sizes may occur for reasons of weight and cost reduction. Hex head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. ![]() ![]() Below are some common spanner (wrench) sizes for metric screw threads.
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