Hobson technical document
Metric Spanner Size Chart for Hex Bolts and Nuts, M1.6 to M110
Hobson's one-page chart of the spanner size, in millimetres, for metric hex bolts and nuts from M1.6 to M110. It gives the size for each standard, because the same thread size can have a different hex across flats depending on the standard it is made to.
What this covers
- Bolt size
- AS 1110, AS 1111, AS 1112, ISO 4014
- AS 1252.1
- DIN 931, DIN 933, DIN 934
- DIN 6921
- JIS B1189
Applies to Bolt Blank, Flange & SEMS Bolts, Hex Bolts & Set Screws, Hex Bolt & Nut (XL Thread), Hex Nut, Lock, Barrel & Specialty Nut, All-Metal Prevailing Torque Nut and Structural Nut.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Covers bolt sizes M1.6 to M110.
- AS 1110, AS 1111, AS 1112 and ISO 4014 bolts and nuts: M6 10mm, M8 13mm, M10 16mm, M12 18mm, M16 24mm, M20 30mm, M24 36mm.
- DIN 931, DIN 933 and DIN 934 differ in some sizes: M10 17mm, M12 19mm, M14 22mm, M22 32mm. Most other sizes match AS 1110.
- AS 1252.1 structural bolts take a bigger spanner: M12 21mm, M16 27mm, M20 32mm, M24 41mm, M30 50mm, M36 60mm.
- DIN 6921 flange bolts take a smaller spanner from M10: M10 15mm, M12 16mm, M16 21mm, M20 27mm. JIS B1189 sizes are listed from M5 to M16.
Who it helps: Anyone sizing a spanner or socket for a metric bolt or nut, especially when mixing AS and DIN parts.
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