O-Ring Compression Set

The biggest reason of O-ring failure is compression set. An effective O-ring seal requires a continuous “seal line” between the sealed surfaces. The establishment of this “seal line” is a function of gland design and seal cross-section which determines the correct amount of squeeze (compression) on the O-ring to maintain seal integrity without excessive deformation of the seal element.

The following suggestions may improve the rate of compression set:

1. Use “Low Compression Set” O-ring material whenever possible.

2. Select O-ring material compatible for the intended service conditions (a material with higher temperature capability or greater chemical resistance).

3. Reduce the system operating temperature.

4. Check frictional heat build-up at seal interface and reduce if excessive.

5. Verify groove dimensions are consistent with recommended Parker practices


For further Information
Website - https://www.fitcorings.com
Email - fitco@fitcorings.com

O Ring Tolerence Chart

Fitco are oring provider since 1995, We have in-house manufacturing and worldwide manufacturing partners for supply all size oring and seals according to international standard: AS 568, ISO 3601, DIN 3771, JIS B2401. We are exporting o-ring worldwide and supply in various materials.

O-Ring is selected as the bore or rod/shaft diameter and housing dimensions in both metric and inch size, so you know exactly which part you need. 

Standard O Rings Cross section widely used 

BS 1806  BS ISO 3601-1 SAE AS 568	Aerospace sizes to  BS ISO 3601-1	BS 4518	Inch sizes
0.070" 1.78mm	0.071" 1.80mm	1.6mm	0.063"
0.103" 2.62mm	0.104" 2.65mm	2.4mm	0.094"
0.139" 3.53mm	0.140" 3.55mm	3.0mm	0.125"
0.210" 5.33mm	0.209" 5.30mm	5.7mm	0.188"
0.275" 6.99mm	0.276" 7.00mm	8.4mm	0.250"

ISO O Rings Tolerance Chart

Fitco O Rings Tolerence Chart

For further details : fitco@fitcoseals.com
https://www.oringstore.com