M8 is one of the standard coarse-thread sizes for spring lock washer under GB/T 93 / DIN 127B. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M8 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 |
|---|---|---|---|---|---|
| M8 | 8.1 | 14.8 | 2.5 | 2.0 | GB/T 93 / DIN 127B |
Spanner & Drive for M8 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)
Drive geometry for M8 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 M8 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082)
M8 Spring Lock Washer — GB/T 93 / DIN 127B (Series 082) are commonly specified for general-purpose load-spreading and locking under machine bolts.
Mating Parts for M8
A M8 flat washer pairs with a M8 bolt/screw and matching M8 nut.
When to Step Up or Down from M8
When the joint preload approaches the proof load of M8 class 8.8, step up to M10 class 8.8 (or move to M8 class 10.9). When the joint is over-specified, M6 often saves weight and cost without losing the safety margin.