This page covers M14 Hex Nut, Fine Pitch to GB/T 6171 / ISO 8673: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (GB/T 6171 / ISO 8673 together with ISO 273, ISO 724 and ISO 898-1 where applicable).
M14 Dimensional Row (GB/T 6171 / ISO 8673)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M14 | 2.0 | 21.0 | 23.36 | 12.8 | ISO 4032 / GB/T 6170 |
Spanner & Drive for M14 Hex Nut, Fine Pitch — GB/T 6171 / ISO 8673 (Series 067)
M14 Hex Nut, Fine Pitch — GB/T 6171 / ISO 8673 (Series 067) have a width across flats of 21.0 mm — fit a 21.0 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 M14 Hex Nut, Fine Pitch — GB/T 6171 / ISO 8673 (Series 067)
M14 Hex Nut, Fine Pitch — GB/T 6171 / ISO 8673 (Series 067) are commonly specified for medium-duty structural joints and motor / chassis mounting.
Installation Tips for M14 Hex Nut, Fine Pitch — GB/T 6171 / ISO 8673 (Series 067)
- 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.
Mating Parts for M14
Pair M14 with the matching M14 bolt or screw, plus a M14 flat washer where required to distribute load on softer materials.