For retaining ring (circlip), GB T 894 is the governing document for the dimensions listed below. Mechanical and performance requirements for this part family are set by its own standards, not by the bolt and screw property-class documents.
GB T 894 — Scope
GB T 894 is "Retaining rings (circlips) for shafts". GB/T 894 is the Chinese national adoption of the same document. The groove dimensions on the shaft are part of the specification, not only the ring.
Tolerance & Product Grades
GB T 894 does not divide retaining ring (circlip) — iso / din (series 147) into product grades. Tolerances are given as limits on the individual dimensions in the table.
Where a general-tolerance class is cited on the drawing instead, it applies to the dimensions not otherwise toleranced.
Dimensions Specified by GB T 894
| Nominal shaft diameter (mm) | Ring free diameter (mm) | Groove diameter (mm) | Ring thickness s (mm) | Type | Reference standard |
|---|---|---|---|---|---|
| 8 | 7.4 | per DIN 471 - confirm for this size | 0.8 | External | DIN 471 / GB/T 894 |
| 10 | 9.3 | per DIN 471 - confirm for this size | 1.0 | External | DIN 471 / GB/T 894 |
| 12 | 11.1 | per DIN 471 - confirm for this size | 1.0 | External | DIN 471 / GB/T 894 |
| 16 | 15.0 | per DIN 471 - confirm for this size | 1.0 | External | DIN 471 / GB/T 894 |
| 20 | 19.0 | per DIN 471 - confirm for this size | 1.2 | External | DIN 471 / GB/T 894 |
| 25 | 23.9 | per DIN 471 - confirm for this size | 1.2 | External | DIN 471 / GB/T 894 |
| 30 | 28.9 | per DIN 471 - confirm for this size | 1.5 | External | DIN 471 / GB/T 894 |
| 40 | 38.5 | per DIN 471 - confirm for this size | 1.75 | External | DIN 471 / GB/T 894 |
| 50 | 48.5 | per DIN 471 - confirm for this size | 2.0 | External | DIN 471 / GB/T 894 |
| 60 | 58.3 | per DIN 471 - confirm for this size | 2.0 | External | DIN 471 / GB/T 894 |
| 80 | 78.0 | per DIN 471 - confirm for this size | 2.5 | External | DIN 471 / GB/T 894 |
| 100 | 98.0 | per DIN 471 - confirm for this size | 3.0 | External | DIN 471 / GB/T 894 |
Equivalent Standards
Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent Retaining Ring (Circlip) — ISO / DIN (Series 147) page.
Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.
When to Specify GB T 894
Choose GB T 894 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for retaining ring (circlip) — iso / din (series 147).
Custom manufacturing · Made to drawing
Need a retaining ring to this standard in a non-standard size?
Parts built to GB T 894 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down. Made by stamping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
