Oring Gland Design: backup_rings
O-ring gland design dimensions and squeeze parameters per AS568B-2016 (SAE standard) and Parker O-Ring Handbook ORD 5700 (2018). Covers five cross-section size groups (0.070, 0.103, 0.139, 0.210, 0.275 inch) for static radial seals, dynamic reciprocating seals, and face (axial) seals. Includes gland depth, groove width (inches and mm), squeeze percentage ranges, groove surface finish requirements, backup ring pressure thresholds, representative AS568 O-ring dimensions by dash number, dimensional tolerances, and elastomer material compatibility temperature ranges (NBR, FKM, EPDM, silicone, CR).
| seal application | record id | description | notes |
|---|---|---|---|
| backup_rings | br_1_groove | Single Backup Ring Groove Width | Single backup ring: add 0.045-0.060 in to gland width per backup ring; low-pressure side only; prevents extrusion above 1500 psi in dynamic service or above 3000 psi in static; material: PTFE preferred; also leather or nylon |
| backup_rings | br_2_groove | Dual Backup Ring Groove Width | Dual backup rings: add 0.090-0.120 in to gland width; one ring on each side of O-ring; required above 3000 psi dynamic or above 5000 psi static; prevents bidirectional extrusion in high-pressure reversing systems; PTFE backup rings preferred |
| backup_rings | br_pressure_threshold | Backup Ring Pressure Threshold | Backup ring required when clearance gap exceeds: 0.003 in for 70 Shore A at 1500 psi; 0.005 in for 80 Shore A at 1500 psi; 0.009 in for 90 Shore A at 1500 psi; maximum diametral clearance 0.002-0.005 in per series |
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