O-Ring Gland Calculator

About O-Ring Gland Calculator

The O-Ring Gland Calculator is a professional tool for mechanical design engineers. Once an O-Ring is selected, the groove depth and width directly determine seal effectiveness. This calculator provides precise groove dimension recommendations based on Parker O-Ring Handbook and ISO 3601-2 standards.

How to Use

1. Select standard system (AS568/JIS/ISO) or enter custom dimensions
2. Choose O-Ring part number, system auto-fills cross section and ID
3. Select application type: static or dynamic seal
4. Review groove dimension recommendations and validation results
5. Adjust compression ratio to optimize seal performance

Formula Explanation

Groove Depth formula: Groove Depth = CS × (1 - Compression%). Fill Ratio formula: Gland Fill = (π × (CS/2)²) / (Groove Depth × Groove Width) × 100%. These formulas follow Parker O-Ring Handbook and ISO 3601-2 standards.

Compression Ratio Guide

• Static Seal (15-25%): No relative motion, e.g., flanges, end caps
• Dynamic Seal (10-16%): Reciprocating or rotating motion, e.g., hydraulic cylinders
• Excessive compression causes permanent deformation; insufficient compression leads to poor sealing

FAQ

What is fill ratio and why is it important?

Fill ratio is the O-Ring cross-section area divided by gland cross-section area. Recommended: 70-85%, leaving room for thermal and fluid expansion. Excessive fill can damage the O-Ring.

When do I need a backup ring?

When working pressure exceeds 3.5 MPa (500 psi), the O-Ring may extrude into the gap. Backup rings prevent extrusion and extend seal life.

What is the difference between AS568 and JIS?

AS568 is the US standard using inch dimensions; JIS B 2401 is the Japanese standard using metric. Cross-section series differ between standards.