M20 Spring Lock Washer (GB/T 93 / DIN 127B) are specified by thread size, length and head dimensions. The M20 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M20 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 |
|---|---|---|---|---|---|
| M20 | 20.2 | 33.6 | 5.5 | 5.0 | GB/T 93 / DIN 127B |
Spanner & Drive for M20 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)
Drive geometry for M20 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) is given by the row above; match the tool to the listed values.
Common Applications for M20 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)
M20 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) are commonly specified for high-load load-spreading on structural joints.
Mating Parts for M20
A M20 flat washer pairs with a M20 bolt/screw and matching M20 nut.
When to Step Up or Down from M20
When the joint preload approaches the proof load of M20 class 8.8, step up to M24 class 8.8 (or move to M20 class 10.9). When the joint is over-specified, M16 often saves weight and cost without losing the safety margin.