O-Ring Engineering Reference

Reference set for dash-size lookup, engineering failure modes, and usage/submission workflow aligned with the Akrivis O-ring gland calculator.

O-Ring Size Lookup

Standard

Dash / Size Code

Cross Section

Material Family

Hardness

Loading entries...

AS568 links use direct dash pattern: /dash-number~247/o-rings-2~/

Identifier	ID (in)	CS (in)	OD (in)	ID (mm)	CS (mm)	OD (mm)	Std	Material	Hardness	Part	Actions

Lookup table is loaded from the internal O-ring reference dataset. If external data is unavailable, built-in fallback rows are used.

Failure Mode Engineering

Failure Mode / Symptom	Primary Trigger in Tool	Typical Cause	Engineering Action
Low squeeze leakage	Compression incl. R below mode limits	Gland too deep, CS too small, eccentricity effect	Increase squeeze by reducing gland depth or increasing CS; verify eccentric min compression.
High squeeze friction / heat / wear	Compression incl. R above mode limits	Gland too shallow, oversized CS	Reduce squeeze by increasing depth or reducing CS; re-check dynamic service limits.
Overfill / volume lock	Housing Fill (%) above target	Groove volume too low for installed section	Increase groove width/depth or reduce CS; keep thermal expansion margin.
ID overstretch damage	Stretch OR Inside-Ø (%) outside range	Selected ring ID too small for installed diameter	Select larger ID dash size; validate installed CS and squeeze after change.
Compression loss at eccentricity	Eccentric Min Compression low	Large diametral clearance, stack-up runout	Reduce clearance E, tighten tolerances, or increase nominal squeeze.
Extrusion / nibbling risk	Gap g high with pressure loading	Clearance too large for pressure/hardness	Reduce gap, raise hardness, or add backup ring for high-pressure duty.
Thermal mismatch drift	Large operating-temperature delta	Material and hardware CTE mismatch	Use temperature-adjusted dimensions and material-grade selection at duty temperature.
Spiral failure in dynamic duty	Dynamic mode with high friction loading	High squeeze + high speed + poor lubrication	Lower squeeze, improve finish/lubrication, and verify hardness and material compatibility.

Use this matrix with your calculator outputs, not as standalone pass/fail. Pressure, media, speed, and surface finish still govern final seal validation.

Usage + Submission Guide

Recommended Calculator Workflow

Select seal mode: Radial Outer, Radial Inner, or Axial.
Select service state: Static or Dynamic.
Open O-ring search and enter dash number or dimensions.
Apply selected ring, then review tolerance worksheet defaults.
Set fit classes/tolerances; if values are nonstandard, use custom.
Enter geometry and diametral clearance, then calculate.
Review concentric and eccentric compression, fill, stretch, and gap.
Resolve warning/failure mode items before release.

For production release, evaluate pressure, media compatibility, surface finish, and thermal conditions in addition to geometric checks.

Submission Template (Copy/Paste)

O-Ring Design Submission
Project:
Component:
Engineer:
Date:

Seal Mode (Radial Outer / Radial Inner / Axial):
Service (Static / Dynamic):
Units (in / mm):

Selected Ring Standard:
Dash Number:
ID x CS:
Material:
Hardness:
Temperature Range:

Input Geometry:
- Bore / Rod / Groove Diameters:
- Groove Width:
- Groove Depth:
- Groove Radius:
- Diametral Clearance:

Calculator Outputs:
- Compression Concentric (%):
- Compression Eccentric Min/Max (%):
- Housing Fill (%):
- Stretch (%):
- Gap g (min/max):

Risk Review:
- Leakage risk:
- Extrusion risk:
- Wear/friction risk:
- Thermal risk:

Disposition:
- Approved / Needs Revision
- Notes:

Open O-Ring Calculator

Primary references in this build: internal O-ring database, ISO/AS context used by the Akrivis calculator implementation, and deterministic geometry checks from the active calculator engine.