Bolt Technical Data Chart (A1 Poster): Head Markings, Spanner Sizes and Thread Pitch

Key things to remember

The essentials from this document in plain words. Check the full document before you rely on a figure.

• ✓Head markings for metric class 4.6, 8.8, 10.9 and 12.9, stainless A2 (class 50 and 70) and A4 (class 50, 70 and 80), imperial BSW grade 2, grade 5 and grade 8, and BUMAX 88 and 109, each with material and standard (for example class 8.8 hex head, AS 1110.1).
• ✓Metric spanner and socket sizes run M1.6 to M110 for AS1110/1 (ISO 4014), AS1252.1, DIN 931/3/4, DIN 6921 and JIS B1189. For example M12: 18mm (AS1110), 21mm (AS1252), 19mm (DIN), 16mm (DIN 6921), 15mm (JIS).
• ✓More rows: M16 24mm (AS1110), 27mm (AS1252); M20 30mm (AS1110), 32mm (AS1252); M24 36mm (AS1110), 41mm (AS1252). Imperial AS2465 sizes run 1/4" (7/16") to 4" (6").
• ✓Pitch table: M12 coarse 1.75mm, fine 1.5mm, extra fine 1.25mm; M16 2.0mm and 1.5mm; M20 2.5mm and 1.5mm, with UNC, UNF, BSW and BSF threads per inch alongside.
• ✓Washer gauge converter, gauge 8 to 30: gauge 8 is 3.99mm, gauge 12 is 2.52mm, gauge 16 is 1.59mm and gauge 30 is 0.31mm.
• ✓Also shows bolt types by head (hex, cup head, socket head, plow, track, structural, purlin, tension control and more) and labels the parts of a thread.

Who it helps: Workshops, fabricators and staff who need a bolt's class, spanner size or pitch at a glance.