For Wedge / Taper Washer — GB/T 852 (Series 084), T 852 defines dimensions, tolerances and product grades. The sections below describe its scope, what it does NOT cover, and the equivalents across DIN, ISO and ASME.
T 852 — Scope
T 852 specifies the dimensions and tolerances of wedge / taper washer — gb/t 852 (series 084). 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 852, alongside the related GB/T 852 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 852
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Mean thickness t (mm) | Slope | Reference standard |
|---|---|---|---|---|---|
| M3 | 3.5 | 6 | 1.2 | 1:6 | DIN 6917 / GB/T 853 |
| M4 | 4.5 | 8 | 1.6 | 1:6 | DIN 6917 / GB/T 853 |
| M5 | 5.5 | 11 | 2.0 | 1:6 | DIN 6917 / GB/T 853 |
| M6 | 6.5 | 13 | 2.4 | 1:6 | DIN 6917 / GB/T 853 |
| M8 | 8.5 | 17 | 3.2 | 1:6 | DIN 6917 / GB/T 853 |
| M10 | 10.5 | 22 | 4.0 | 1:6 | DIN 6917 / GB/T 853 |
| M12 | 12.5 | 26 | 4.8 | 1:6 | DIN 6917 / GB/T 853 |
| M14 | 14.5 | 30 | 5.6 | 1:6 | DIN 6917 / GB/T 853 |
| M16 | 16.5 | 35 | 6.4 | 1:6 | DIN 6917 / GB/T 853 |
| M18 | 18.5 | 39 | 7.2 | 1:6 | DIN 6917 / GB/T 853 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Wedge / Taper Washer — GB/T 852 (Series 084) page. Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify T 852
Choose T 852 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for wedge / taper washer — gb/t 852 (series 084).