M16 Hex Thick Nut (DIN 6330 / GB/T 56) are specified by thread size, length and head dimensions. The M16 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M16 Dimensional Row (DIN 6330 / GB/T 56)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M16 | 2.0 | 24.0 | 26.75 | 14.8 | ISO 4032 / GB/T 6170 |
Spanner & Drive for M16 Hex Thick Nut — DIN 6330 / GB/T 56 (Series 052)
M16 Hex Thick Nut — DIN 6330 / GB/T 56 (Series 052) have a width across flats of 24.0 mm — fit a 24.0 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 M16 Hex Thick Nut — DIN 6330 / GB/T 56 (Series 052)
M16 Hex Thick Nut — DIN 6330 / GB/T 56 (Series 052) are commonly specified for medium-duty structural joints and motor / chassis mounting.
Mating Parts for M16
Pair M16 with the matching M16 bolt or screw, plus a M16 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M16
When the joint preload approaches the proof load of M16 class 8.8, step up to M20 class 8.8 (or move to M16 class 10.9). When the joint is over-specified, M12 often saves weight and cost without losing the safety margin.