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O-Ring Groove Design

Groove Design for O-Ring Installation

Daemar DMR O-Ring Installation Groove Design

Uniform Dash Numbers Actual Cross Section Diameter Diametrical Squeeze (Minimum) Gland Depth F Groove Width G +/- .003 Flange Groove Diametrical Clearance (Maximum) D Eccentricity3 Radius (R)
Dynamic Static Dynamic +.000 -.001 Static +.000 -.004 No Backup Ring One Backup Ring Two Backup Rings Depth H K min 500 PSI 1500 PSI
– 001 .040 + .003 .004 .006 .033 .031 .056 .028/.032 .068 .005 .0025 .002 .010
– 002 .050 + .003 .005 .008 .042 .039 .070 .037/.041 .078 .006 .003 .002 .010
– 003 .060 + .003 .006 .009 .051 .048 .084 .045/.050 .091 .007 .0035 .002 .016
– 004 thru –050 .070 + .003 .007 .011 .056 .051 .098 .140 .207 .051/.061 .095 .008 .004 .002 .016
102 thru –178 .103 + .003 .010 .015 .090 .082 .144 .173 .240 .081/.091 .140 .009 .004 .002 .016
-201 thru –284 .139 + .004 .014 .021 .121 .114 .195 .210 .277 .110/.120 .190 .010 .006 .003 .031
-309 thru –395 .210 + .005 .021 .032 .184 .173 .294 .313 .412 .170/.180 .280 .011 .007 .004 .031
-425 thru – 475 .275 + .006 .028 .042 .241 .227 .385 .410 .540 .231/.241 .370 .012 .008 .005 .047

 

Note 1. The following sizes are no normally recommended for dynamic service, although special applications may permit there use:

– 001 thru – 003 – 013 thru – 050
– 117 thru – 178 – 223 thru – 284
– 350 thru – 395 – 461 thru – 475

Note 2. Clearances shown based on 70 durometer materials. The clearances must be held to an absolute minimum consistent with design requirments for temperature variations and should not exceed the values shown.

Note 3. Total indicator reading between groove and adjacent bearing surface. All surfaces and corners must be free of tool marks and scratches.

 

O-Ring groove and dimensions may be calculated as follows (please refer to chart above)

Given: Example Given: Example
Rod Diameter C = 500 Cylinder Bore A = 1000
O-ring Cross Section W = 3/32″ nominal O-ring Cross Section W = 1/8″ nominal
Dynamic Application Static application
No back-ups required No back-ups required
Determine Determine
O-ring size = AS-568-112(1/2″ ID x 3/32″W) O-ring size = AS-568-320(1″ OD x 1/8″ W)
Gland Depth F = 0.090 +.000/-.001″ (from chart) Gland Depth F = 0.114 + .000/-.004″(from chart)
Groove Width G = .144 +/- .003″ (from chart) Groove Width G = .198 +/-.003″ (from chart)
Rod Gland D = C + 2F
= .500″ + 2 x .090″
= .680″
= A-2F
= 1.000″ -2 x .114
= .772″

 

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