Retaining Ring Size Calculator

Retaining rings are essential components used to secure parts on shafts or within housings. Here’s a comprehensive table summarizing the key information about retaining ring sizes and types:

Retaining Ring Size and Type Overview

Ring Type	Size Range (Inch)	Size Range (mm)	Typical Materials	Applications
Internal	0.250 to 1.500	6.35 to 38.1	Carbon steel, Stainless steel	Retaining components in bores
External	0.125 to 10.00	3.175 to 254	Steel, Stainless steel	Retaining components on shafts
Custom	0.050 to 60.00	1.27 to 1524	Various options	Various custom applications

Key Points to Remember

1. Size Variations: Retaining ring sizes can range from very small (0.250″ or 6.35 mm) to very large (up to 60″ or 1524 mm for custom sizes).
2. Material Options: Common materials include carbon steel, stainless steel, and various alloys for specific applications1.
3. Types:
   • Internal rings: Used for securing components within bores or housings.
   • External rings: Used for retaining components on shafts.
   • Custom rings: Available for specialized applications.
4. Standards: Many retaining rings conform to ANSI standards, such as ANSI B27.7 for metric sizes3.
5. Groove Design: Proper groove dimensions are crucial for effective retaining ring installation. This includes groove diameter, width, and depth34.
6. Tolerances: Specific tolerances are applied to ring free diameters, thicknesses, and groove dimensions to ensure proper fit and function34.
7. Special Varieties:
   • Extra-thick rings for high-curvature lenses
   • Stress-free rings for sensitive applications
   • Plastic rings for gentler contact with optics
   • Vacuum-compatible unanodized aluminum rings2
8. Industry Applications: Retaining rings are used in various industries, including aerospace, automotive, medical, and oil & gas1.
9. Selection Factors: When choosing a retaining ring, consider the application, environment, load requirements, and compatibility with the assembly12.
10. Installation: Proper tools, such as retaining ring pliers, are often required for installation and removal5.

By understanding these key aspects of retaining ring sizes and types, engineers and designers can select the most appropriate ring for their specific application, ensuring secure and reliable component retention.