Back-up Ring Characteristics

CHARACTERISTICS

Back-up rings are used in conjunction with O-ring for both static and dynamic sealing applications. They prevent extrusion of the O-ring when it is subjected to high pressures, or when the extrusion gaps are excessive. Wherever possible two Back-up rings should be used, one on each side of the O-ring.

-Solid PTFE Back-up Ring-

-Spiral PTFE Back-up Ring-

-Split PTFE Back-up Ring-


-Flat Back-up Ring-	-Contoured Back-up Ring-

O-RING		BACK-UP RING
NOMINAL CROSS SECTION	ACTUAL CROSS SECTION	PART NO 19-	W	T
1/16	.070 ±.003	-013 to -050	.053 ±.003	.040 ±.003
3/32	.103 ±.003	-111 to -178	.086 ±.003	.040 ±.003
1/8	.139 ±.004	-205 to -273	.118 ±.004	.040 ±.003
3/16	.210 ±.005	-309 to -375	.183 ±.005	.055 ±.004
1/4	.275 ±.006	-425 to -449	.236 ±.006	.085 ±.005

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