M24 Thin Hex Nut, Fine Pitch (GB/T 6173 / ISO 8675) are specified by thread size, length and head dimensions. The M24 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M24 Dimensional Row (GB/T 6173 / ISO 8675)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M24 | 3.0 | 36.0 | 39.98 | 12.0 | ISO 4035 / GB/T 6172 |
Spanner & Drive for M24 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M24 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056) have a width across flats of 36.0 mm — fit a 36.0 mm open-ended spanner or socket. Use a 6-point socket for tight clearances and to reduce rounding; for repeated assembly choose a torque wrench so the joint preload is repeatable.
Common Applications for M24 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M24 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056) are commonly specified for structural joints, flange connections and heavy equipment foundations.
Installation Tips for M24 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- On flanged or serrated variants, do NOT add a separate flat washer — the flange already spreads the load and the washer can defeat the locking serrations.
- At M24 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M24
Pair M24 with the matching M24 bolt or screw, plus a M24 flat washer where required to distribute load on softer materials.