Ponn Machine Cutting Company

O-Ring Groove Design



    Diametral
Squeeze
(Minimum)
Gland Depth F Groove Width G
+/-.003
Diametral
Clearance
(Maximum) D
   
Uniform
Dash
Number
Actual
Cross Section
Diameter
Dynamic1 Static Dynamic1
+.000
-.001
Static
+.000
-.004
No
Backup
Ring
One
Backup
Ring
Two
Backup
Rings
500 PSI 1500 PSI Eccentricity
(Maximum)
Radius (R)
-.001 .040 +.003 .004 .006 .033 .031 .056 - - .005 .0025 .002 .010
-.002 .050 +.003 .005 .008 .042 .039 .070 - - .006 .003 .002 .010
-.003 .060 +.003 .009 .009 .051 .048 .084 - - .007 .0035 .002 .016
-.004 thru -.050 .070 +.003 .007 .011 .060 .056 .098 .140 .207 .008 .004 .002 .016
-.102 thru -.178 .103 +.003 .010 .015 .090 .085 .144 .173 .240 .009 .004 .002 .016
                         
-.201 thru -.284 .139 +.004 .014 .021 .121 .114 .195 .210 .277 .010 .006 .003 .031
-.309 thru -.395 .210 +.005 .021 .032 .184 .173 .294 .313 .412 .011 .007 .004 .031
-.425 thru -.475 .275 +.006 .028 .042 .241 .227 .385 .410 .540 .012 .008 .005 .047

Note 1. The following sizes are not normally recommended for dynamic service.
    -001 thru -003   -013 thru -050   -117 thru -118   -223 thru -284   -350 thru -395   -164 thru -475  
Note 2. Clearances shown are based on 70 durometer values.
Note 3. TIR between groove and adjacent bearing surface. Surfaces and corners must be free of tool marks and scratches.




TO CALCULATE O-RING GROOVE DIMENSIONS:

Rod Seal

Given:    
Rod Diameter C
O-ring Cross Section W
Dynamic application
No back-ups required
Example
= .500
= 3/32 nominal
Piston Seal

Given:    
Cylinder Bore A
O-ring Cross Section W
Static application
No back-ups required
Example
= 1.000
= 1/8 nominal
Determine:
O-ring size


Gland depth F

Groove width G

Rod Gland D



= AS-568-112
(1/2 ID x 3/32 W
nominal dimensions)
= .090 +.000 -.001
(from chart)
= .144 +/-.003
(from chart)
= C + 2F = .500 + 2x.090 = .680


Determine:
O-ring size


Gland depth F

Groove width G

Rod Gland D



= AS-568-210
(1 OD x 1/8 W
nominal dimensions)
= .114 + .000 - .004
(from chart)
= .195 +/-.003
(from chart)
= A - 2F = 1.000 -2x.114 = .772


  20A Cross Street, Woburn MA  01801   USA Tel: (781) 937-3373 Fax: (781) 937-0372 E-mail: sales@ponnmachine.com