This page covers M12 Tab Lock Washer for Round Nut to GB/T 858: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (GB/T 858 together with ISO 273, ISO 724 and ISO 898-1 where applicable).
M12 Dimensional Row (GB/T 858)
| For shaft / nut size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Tab length (mm) | Reference standard |
|---|---|---|---|---|---|
| M12 | 12.5 | 25 | 1.0 | 9 | GB/T 858 |
Spanner & Drive for M12 Tab Lock Washer for Round Nut — GB/T 858 (Series 072)
Drive geometry for M12 Tab Lock Washer for Round Nut — GB/T 858 (Series 072) is given by the row above; match the tool to the listed values.
Common Applications for M12 Tab Lock Washer for Round Nut — GB/T 858 (Series 072)
M12 Tab Lock Washer for Round Nut — GB/T 858 (Series 072) 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.