Overview
Rotor Clip HO-137ST internal retaining rings are tapered-section axially assembled circlips engineered for industrial bearing housings, gearboxes, pumps, and machinery assemblies. These rings prevent axial movement of components in grooved bores by providing a protruding shoulder that locks parts in place. Manufactured from carbon spring steel with phosphate plating, they deliver reliable retention in demanding environments.
Key Features
- Axially assembled internal design fits 1.375″ housing bore diameter
- Tapered section design ensures contact with the groove along the entire periphery
- Lug holes for ease of installation and removal using specialized pliers
- Rated for 9,846 lbs thrust load (ring safety factor of 4) and 5,050 lbs groove load (safety factor of 2)
- Carbon spring steel construction with phosphate plating for corrosion resistance
- Installed into machined grooves in housings/bores
- Pack of 25 units, new in box condition
Technical Specifications
The following dimensions and properties apply to the HO-137ST series across all finish options (PA, PD, ZD, SS):
| Series | HO (Internal Housing) |
| Housing Bore Diameter | 1.375 inches |
| Ring Thickness | 0.050 inches |
| Free Outside Diameter | 1.526 inches |
| Groove Diameter | 1.461 inches |
| Groove Width | 0.056 inches |
| Groove Depth | 0.043 inches |
| Lug Hole Diameter | 0.078 inches |
| Material | Carbon Spring Steel |
| Finish Options | PA (Phosphate), PD (Phosphate), ZD (Zinc Dichromate), SS (Stainless Steel) |
| Thrust Load Rating (Ring Safety Factor 4) | 9,846 lbs |
| Groove Load Rating (Safety Factor 2) | 5,050 lbs |
| Quantity Per Pack | 25 rings |
| Installation Type | Axially Assembled (Horizontal) |
| Condition | New in Box |
Typical Applications
- Electric motor and gearbox housings
- Pump and compressor bearing retention
- Industrial machinery spindle assemblies
- Drive shaft bearing bores
- Industrial automation and machine tool bearings
- General manufacturing and assembly operations
Compatibility & Replacements
Compatible With
- Any application requiring 1.375″ bore internal retaining ring with 0.050″ thickness
- Standard grooved housing bore designs per ISO 15149 and DIN 471 equivalent
- Industrial bearing assemblies from major OEMs (SKF, Timken, NSK, FAG, NTN)
- Machinery across automotive, industrial, agricultural, and construction sectors
Replaces / Drop-In Replacement For
- Rotor Clip HO-137ST (all finish variants: PA, PD, ZD, SS)
- Generic internal 1.375″ bore circlips with matching groove specifications
- Standard tapered section internal retaining rings for 35mm bore applications
Works With
- Rotor Clip specialized retaining ring pliers and installation tools
- Rotor Clip Pneumatic Kick Jr. automatic installation tools
- Standard bearing and machinery assembly procedures
- Related Rotor Clip HO series rings (HO-100 through HO-275 for various bore sizes)
- Inverted option: HOI-137ST for applications requiring reversed lugs
