Electro Hardware SE-31ST PA-50 E Style Retaining Ring

Product Description

The ELECTRO HARDWARE SE-31ST PA-50 is an external E style retaining ring designed to secure components on shafts in mechanical assemblies. Made from plain-finish spring steel, this ring seats into a groove on the shaft and provides a positive stop against axial movement. The groove diameter is 0.25 inches and the ring is sized for a 5/16 inch shaft diameter. Ring thickness measures 0.025 inches. These rings are installed without special equipment in most cases and are a standard fastener choice for HVAC equipment, pump assemblies, motors, and general industrial hardware applications.

E style retaining rings are used across a wide range of mechanical and electromechanical assemblies where a compact, external retention solution is needed. Common applications include fractional horsepower motor shafts, fan blade retention, gear shaft assemblies, and other rotating or reciprocating components. The plain spring steel construction makes this ring suitable for dry or lightly lubricated environments. This is a single-piece ring sold individually, with a minimum order quantity of 5 pieces per transaction.

Key Features

• E style external profile seats in a shaft groove for axial component retention
• Groove diameter: 0.25 inches
• Shaft diameter: 5/16 inches
• Ring thickness: 0.025 inches
• Spring steel construction with plain finish for general-purpose use
• Inch measurement system; does not meet military specifications

Compatibility

Designed as a standard external E style retaining ring for 5/16 inch shafts with a 0.25 inch groove diameter in mechanical assemblies across HVAC, plumbing, and industrial equipment applications.

Installation Notes

E style retaining rings are typically installed and removed by hand or with needle-nose pliers; dedicated retaining ring pliers reduce the risk of deforming the ring. Ensure the shaft groove is clean and free of burrs before seating the ring. De-energize and lock out any equipment before servicing components that use retaining rings on rotating shafts. Verify groove dimensions match the ring specifications before installation to prevent ring failure under load.