Rotor Clip E-37ST Mcd External E Style Retaining Ring

Product Description

The ROTOR CLIP E-37ST MCD is an external E style retaining ring designed to secure components on a 3/8 inch shaft. The ring seats in a machined groove on the shaft exterior and uses three prongs to maintain axial retention without the need for threads or adhesives. Manufactured from SAE 1060-1090 stainless steel with a cadmium finish, it delivers corrosion resistance and consistent hardness across the 37-43 HRC range. This ring is specified to Military Specification MS 16633-1037 and conforms to ISO 13485:2015 quality standards, making it appropriate for precision mechanical assemblies where controlled retention and material traceability are required.

The E-37ST MCD is suited for use in compact shaft assemblies where a traditional snap ring or C-clip would be too large for the available clearance. Common applications include light machinery, instrumentation, small motors, valve assemblies, and similar mechanical systems found in HVAC equipment, plumbing hardware, and industrial production lines. The cadmium plating provides additional protection in environments with moderate moisture or chemical exposure. Installation is performed by trade mechanics, millwrights, and equipment service technicians working on shaft diameters of 3/8 inch.

Key Features

• E style external retaining ring with three-prong engagement for secure axial retention on 3/8 inch shafts
• Cadmium finish provides corrosion resistance in moderate-exposure environments
• Hardness rated 37-43 HRC for consistent performance under load
• Meets Military Specification MS 16633-1037 and ISO 13485:2015 quality standards
• Conforms to SAE 1060-1090 and UNS G10600-G10900 material specifications
• Groove width tolerance of 0.0000 to 0.0030 inches for precise fitment

Compatibility

Designed as an OEM-style external E style retaining ring replacement for 3/8 inch shaft diameter applications requiring a 0.303 inch groove diameter with a groove width of 0.039 inches.

Installation Notes

Installation and removal of external retaining rings require appropriate ring pliers rated for E style rings to avoid deforming the prongs or overstressing the ring. Always de-energize and lock out equipment before servicing any shaft assembly. Verify groove dimensions against the specified groove diameter, width, and depth tolerances before installing. Do not substitute cadmium-plated rings in applications where cadmium is restricted by environmental or regulatory requirements.