T 858 covers the dimensional requirements for tab lock washer for round nut. Reproduced below: the complete size table, the tolerance grades, and the companion and equivalent standards referenced when ordering to this document.
T 858 — Scope
T 858 specifies the dimensions and tolerances of tab lock washer for round nut — gb/t 858 (series 073). Material, property class, surface finish and packaging are governed by separate documents in the same standards family (for example ISO 898-1 for the mechanical property classes of bolts and screws).
Tolerance & Product Grades
T 858, alongside the related GB/T 858 entries on this site, specifies product grades (typically A or B for fine work and C for general engineering) and tolerance classes for the controlling dimensions. Choose the grade against the precision your application requires.
Dimensions Specified by T 858
| For shaft / nut size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Tab length (mm) | Reference standard |
|---|---|---|---|---|---|
| M10 | 10.5 | 21 | 1.0 | 8 | GB/T 858 |
| M12 | 12.5 | 25 | 1.0 | 9 | GB/T 858 |
| M16 | 16.5 | 30 | 1.0 | 10 | GB/T 858 |
| M20 | 20.5 | 38 | 1.5 | 12 | GB/T 858 |
| M24 | 24.5 | 45 | 1.5 | 14 | GB/T 858 |
| M30 | 30.5 | 55 | 1.5 | 16 | GB/T 858 |
| M36 | 36.5 | 65 | 2.0 | 18 | GB/T 858 |
| M48 | 48.5 | 85 | 2.0 | 20 | GB/T 858 |
| M60 | 60.5 | 105 | 2.5 | 24 | GB/T 858 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Tab Lock Washer for Round Nut — GB/T 858 (Series 073) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify T 858
Choose T 858 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for tab lock washer for round nut — gb/t 858 (series 073).