Back-up ring for O-Ring

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1.Application and properties

Suitable for middle-high pressure sealing, installed behind the O-ring to prevent the extrusion of the sealing component. The sealing capacity of the sealing component with the installed backup ring generally increases by 10-30 MPa compared to the sealing component without a backup ring. The performance structure ratio and performance cost ratio are both high, and it has been widely used.
The adaptability to media and operating conditions can be met by choosing suitable materials, so it can be used in various working conditions.
According to whether they are open, backup rings can be divided into open and non-open backup rings. If it is particularly difficult to install non-open backup rings or cannot be installed at all, open backup rings are used. Otherwise, non-open backup rings are preferred.

2.Standard material

PTFE / PU / Rubber

3.Marking method

Mark with Part No. For example: P50, G50

4. Product Dimensions（P series）

Part No. Back-up ring	Back-up ring Dimensions					Matched O-Ring Part No.
	Inner Diameter d		Outer Diameter D		Thickness
	Size	Tolerance	Size	Tolerance	T
P3	3	+0.15 -0	6	+0 -0.15	1.25 ±0.10	P3
P4	4		7			P4
P5	5		8			P5
P6	6		9			P6
P7	7		10			P7
P8	8		11			P8
P9	9		12			P9
P10	10		13			P10
P10A	10	+0.15 -0	14	+0 -0.15		P10A
P11	11		15			P11
P11.2	11		15.2			P11.2
P12	12		16			P12
P12.5	13		16.5			P12.5
P14	14		18			P14
P15	15		19			P15
P16	16		20			P16
P18	18		22			P18
P20	20		24			P20
P21	21		25			P21
P22	22		26			P22
P22A	22	+0.20 -0	28	+0 -0.20		P22A
P22.4	22		28.4			P22.4
P24	24		30			P24
P25	25		31			P25
P25.5	26		31.5			P25.5
P26	26		32			P26
P28	28		34			P28
P29	29		35			P29
P29.5	30		35.5			P29.5
P30	30		36			P30
P31	31		37			P31
P31.5	32		37.5			P31.5
P32	32		38			P32
P34	34		40			P34
P35	35		41			P35
P35.5	36		41.5			P35.5
P36	36		42			P36
P38	38		44			P38
P39	39		45			P39
P40	40		46			P40
P41	41		47			P41
P42	42		48			P42

Part No. Back-up ring	Back-up ring Dimensions					Matched O-Ring Part No
	Inner Diameter d		Outer Diameter D		Thickness
	Size	Tolerance	Size	Tolerance	T
P44	44	+0.20 -0	50	+0 -0.20	1.25 ±0.1	P44
P45	45		51			P45
P46	46		52			P46
P48	48		54			P48
P49	49		55			P49
P50	50		56			P50
P48A	48	+0.25 -0	58	+0 -0.25	1.90 ±0.13	P48A
P50A	50		60			P50A
P52	52		62			P52
P53	53		63			P53
P55	55		65			P55
P56	56		66			P56
P58	58		68			P58
P60	60		70			P60
P62	62		72			P62
P63	63		73			P63
P65	65		75			P65
P67	67		77			P67
P70	70		80			P70
P71	71		81			P71
P75	75		85			P75
P80	80		90			P80
P85	85		95			P85
P90	90		100			P90
P95	95		105			P95
P100	100		110			P100
P102	102		112			P102
P105	105		115			P105
P110	110		120			P110
P112	112		122			P112
P115	115		125			P115
P120	120		130			P120
P125	125		135			P125
P130	130		140			P130
P132	132		142			P132
P135	135		145			P135
P140	140		150			P140
P145	145		155			P145
P150	150		160			P150

Part No. Back-up ring	Back-up ring Dimensions					Matched O-Ring Part No.
	Inner Diameter d		Outer Diameter D		Thickness
	Size	Tolerance	Size	Tolerance	T
P150A	150	+0.30 -0	165	+0 -0.30	2.75 ±0.15	P150A
P155	155		170			P155
P160	160		175			P160
P165	165		180			P165
P170	170		185			P170
P175	175		190			P175
P180	180		195			P180
P185	185		200			P185
P190	190		205			P190
P195	195		210			P195
P200	200		215			P200
P205	205		220			P205
P209	209		224			P209
P210	210		225			P210
P215	215		230			P215
P220	220		235			P220
P225	225		240			P225
P230	230		245			P230
P235	235		250			P235
P240	240		255			P240
P245	245		260			P245
P250	250		265			P250
P255	255		270			P255
P260	260		275			P260
P265	265		280			P265
P270	270		285			P270
P275	275		290			P275
P280	280		295			P280
P285	285		300			P285
P290	290		305			P290
P295	295		310			P295
P300	300		315			P300
P315	315		330			P315
P320	320		335			P320
P335	335		350			P335
P340	340		355			P340
P355	355		370			P355
P360	360		375			P360
P375	375		390			P375
P385	385		400			P385
P400	400		415			P400

Part No. Back-up ring	Back-up ring Dimensions					Matched O-Ring Part No
	Inner Diameter d		Outer Diameter D		Thickness
	Size	Tolerance	Size	Tolerance	T
G25	25	+0.20 -0	30	+0 -0.20	1.25 ±0.10	G25
G30	30		35			G30
G35	35		40			G35
G40	40		45			G40
G45	45		50			G45
G50	50		55			G50
G55	55	+0.25 -0	60	+0 -0.25		G55
G60	60		65			G60
G65	65		70			G65
G70	70		75			G70
G75	75		80			G75
G80	80		85			G80
G85	85		90			G85
G90	90		95			G90
G95	95		100			G95
G100	100		105			G100
G105	105		110			G105
G110	110		115			G110
G115	115		120			G115
G120	120		125			G120
G125	125		130			G125
G130	130		135			G130
G135	135		140			G135
G140	140		145			G140
G145	145		150			G145
G150	150	+0.30 -0	160	+0 -0.30	1.90 ±0.13	G150
G155	155		165			G155
G160	160		170			G160
G165	165		175			G165
G170	170		180			G170
G175	175		185			G175
G180	180		190			G180
G185	185		195			G185
G190	190		200			G190
G195	195		205			G195
G200	200		210			G200
G210	210		220			G210
G220	220		230			G220
G230	230		240			G230
G240	240		250			G240
G250	250		260			G250
G260	260		270			G260
G270	270		280			G270
G280	280		290			G280
G290	290		300			G290
G300	300		310			G300

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