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DIN 6923: Hexagon nuts with flange: Withdrawn: DIN EN 1661: EN 1661: DIN 6924: Prevailing torque type hexagon nuts with nonmetallic insert: Withdrawn: DIN EN ISO 7040, DIN EN ISO 10512: ISO 7040, ISO 10512: DIN 6925: Prevailing torque type all-metal hexagon nuts: Withdrawn: DIN EN ISO 7042, DIN EN ISO 10513: ISO 7042, ISO 10513: DIN 6926
Fastener terminology of hex nuts: d: Nominal thread diameter k: Wrench size (width across flats) h: Thickness e: Width across corners = Width across flats is the distance between two parallel surfaces on the head of a screw, bolt or nut. The width across flats will define the size of the spanner or wrench needed.
Hexagonal (generally abbreviated to "hex") head widths (width across flats, spanner size) are for DIN 934 hex nuts and hex head bolts. Other (usually smaller) sizes may occur to reduce weight or cost, including the small series flange bolts defined in ISO 4162 which typically have hexagonal head sizes corresponding to the smaller 1st choice ...
Standard Name Type Example ASME B1.1-2003 (R2018) Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form: 1 ⁄ 4 ″-20 UNC #4-40 UNC ASME B1.5-1997 (R2014) Acme Screw Threads: Trapezoidal Thread Form: Tr 60×9 ANSI/ASME B1.9-1973 (R2017) Buttress Inch Screw Threads: Breech-Lock Thread Form: ASME B1.10M-2004 (R2014) Unified ...
Square nut: Four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening) [citation needed] Swage nut: Self-clinching nut Used on sheet metal.
An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.