M14 Hex Nuts, Grade C are manufactured to ISO 4034 with a coarse thread pitch of 2 mm. This page lists the controlling dimensions for the M14 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M14 Dimensional Row (ISO 4034)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Nut height m (mm) | Product grade | Reference standard |
|---|---|---|---|---|---|---|
| M14 | 2.0 | 22.0 | 24.49 | 12.8 | Grade C | ISO 4034 / DIN 555 |
Spanner & Drive for M14 Hex Nuts, Grade C
M14 Hex Nuts, Grade C have a width across flats of 22.0 mm — fit a 22.0 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 Nuts, Grade C
M14 Hex Nuts, Grade C are commonly specified for medium-duty structural joints and motor / chassis mounting.
Installation Tips for M14 Hex Nuts, Grade C
- 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.