For Retaining Ring (Circlip) — ISO / DIN (Series 149) in Grade 12.9 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 12.9 Steel Retaining Ring (Circlip) — ISO / DIN (Series 149) and lists every size we supply.
Why Choose Grade 12.9 Steel for Retaining Ring (Circlip) — ISO / DIN (Series 149)
The highest common strength class, for high-load machine assembly. For retaining ring (circlip) — iso / din (series 149), this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating or black-oxide protection |
Corrosion Behavior in Service
Carbon and alloy steel retaining ring (circlip) — iso / din (series 149) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.
Galvanic & Galling Considerations
For retaining ring (circlip) — iso / din (series 149) in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.
Sizes of Retaining Ring (Circlip) — ISO / DIN (Series 149) Available in Grade 12.9 Steel
| Nominal diameter (mm) | Ring diameter d1 (mm) | Groove diameter d2 (mm) | Thickness s (mm) | Type | Reference standard |
|---|---|---|---|---|---|
| 8 | 7.4 | 7.1 | 0.8 | External | DIN 471 / GB/T 894 |
| 10 | 9.3 | 9.0 | 1.0 | External | DIN 471 / GB/T 894 |
| 12 | 11.1 | 10.8 | 1.0 | External | DIN 471 / GB/T 894 |
| 16 | 15.0 | 14.7 | 1.0 | External | DIN 471 / GB/T 894 |
| 20 | 19.0 | 18.7 | 1.2 | External | DIN 471 / GB/T 894 |
| 25 | 23.9 | 23.6 | 1.2 | External | DIN 471 / GB/T 894 |
| 30 | 28.9 | 28.6 | 1.5 | External | DIN 471 / GB/T 894 |
| 40 | 38.5 | 38.2 | 1.75 | External | DIN 471 / GB/T 894 |
| 50 | 48.5 | 48.2 | 2.0 | External | DIN 471 / GB/T 894 |
| 60 | 58.3 | 58.0 | 2.0 | External | DIN 471 / GB/T 894 |
| 80 | 78.0 | 77.7 | 2.5 | External | DIN 471 / GB/T 894 |
| 100 | 98.0 | 97.7 | 3.0 | External | DIN 471 / GB/T 894 |