O-Ring Groove Identifier — Reverse Engineering Tool

Identify an O-Ring from an Existing Groove

Have an existing groove but don’t know which o-ring fits it? Enter your groove measurements below and this tool will search the full AS568 catalog to find matching o-rings ranked by seal quality.

Use this when: You’re reverse-engineering an existing seal — e.g., replacing a failed o-ring in a legacy system with no documentation, or identifying a groove found during teardown.

📐 Designing a new groove? Use the O-Ring Groove Calculator to size it from scratch with squeeze, fill, and stretch targets.

Groove Measurements

Face Seal (Boss / Flange)
Piston Seal (ID seals against bore)
Rod Seal (OD seals against bore)

How It Works

This tool scores each AS568 o-ring against your groove geometry based on three critical seal parameters:

  • Squeeze (15-25%) – How much the o-ring cross-section is compressed. Too little = leaks. Too much = excessive friction and extrusion risk.
  • Groove Fill (75-85%) – Percentage of groove volume occupied by the o-ring. Must leave room for thermal expansion while maintaining seal contact.
  • Stretch/Compression (varies by seal type) – How much the o-ring diameter changes when installed. Face seals: 0-2%. Piston seals: 2-5%. Rod seals: 1-3%.

Results are ranked by a weighted score and color-coded: Excellent fits are ready to spec. Acceptable fits work but are not ideal. Marginal fits should be used with caution.

Need to design a new groove? Use the O-Ring Groove Calculator to go from o-ring size to optimal groove dimensions.