Internal circlips, also known as internal retaining rings, internal snap rings, or circlips for bores, are spring steel fasteners designed to be installed into a machined groove on the inside diameter of a cylindrical housing or bore. Their primary function is to prevent components such as bearings, gears, or piston pins from moving axially within the housing, ensuring precise positioning and reliable operation under dynamic loads.
Applicable Standards
| Standard | Description |
|---|---|
| DIN 472 | Internal circlips (retaining rings for bores) – metric series, nominal diameters 8mm to 950mm |
| GB/T 893 | Chinese national standard for internal circlips (equivalent to DIN 472) |
| ASME B18.27 | Inch series retaining rings for North American applications |
| BS 3673-4:1977 | British standard specification for carbon steel retaining rings |
Materials & Surface Finishes
Common Applications
| Industry | Specific Applications |
|---|---|
| Automotive | Transmission assemblies, piston pin retainers, axle shafts |
| Industrial Machinery | Gearboxes, hydraulic cylinders, pneumatic actuators, bearing housings |
| Electric Motors | Bearing retention on rotor shafts |
| Aerospace | High-reliability components requiring precise axial positioning |
| Hydraulic & Pneumatic Systems | Piston rod positioning, cylinder end caps, valve assemblies |
| Renewable Energy | Wind turbine gearboxes and rotating assemblies |
| Construction Equipment | Heavy machinery gearbox and drive train components |
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