M12 Spring Lock Washer (GB/T 93) (GB/T 93 / DIN 127B) are specified by thread size, length and head dimensions. The M12 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M12 Dimensional Row (GB/T 93 / DIN 127B)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Width b (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|---|
| M12 | 12.2 | 21.1 | 3.5 | 3.0 | GB/T 93 / DIN 127B |
Spanner & Drive for M12 Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081)
Drive geometry for M12 Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081) is given by the row above; match the tool to the listed values.
Common Applications for M12 Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081)
M12 Spring Lock Washer (GB/T 93) — GB/T 93 / DIN 127B (Series 081) are commonly specified for medium-duty structural joints.
Mating Parts for M12
A M12 flat washer pairs with a M12 bolt/screw and matching M12 nut.
When to Step Up or Down from M12
When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 often saves weight and cost without losing the safety margin.