Wrench Size Spec Table
3 types of spec data
A quick-lookup table mapping metric bolt sizes to wrench (spanner) sizes. Covers the across-flats (AF) for hex bolts per ISO 4014, the hex-key size for socket cap screws per ISO 4762, and the reduced AF for flange bolts per DIN 6921, from M3 through M48. Use it for on-site tool selection, socket-set verification, and maintenance. Note that some Japanese equipment uses a semi-JIS AF (M10 = 14 mm, M12 = 17 mm) — verify with calipers when unsure.