O-Ring JISB2401 G Series (for Fixing)

Brand :

NOK

Caution

The product images are representative only. Specifications may vary by part number, including shape and color.
Items without parentheses are black.

Product Description

Annular packing with an O-shaped (circular) cross section that can be used as a seal for a wide variety of fluids such as oil, water, air, and gas.
[Features]
·Features unique mix design, and designed materials also conform to JIS standard.
·Manufactured under consistent quality management system ranging from raw materials to products.
· Evaluation and analysis capabilities based on well-equipped testing facilities.
·In order to maintain the same sealing performance over a long period of time, the manufacturer selects materials and dimensions suitable for the usage conditions.
[Applications]
·Available for fixing and dynamic applications. If not suitable for usage conditions, cutting, swelling, pressing crack, etc., will occur.

Drawing

O-ring

For cylindrical surface mount

For Flat Surface Mount

Groove shape: No backup ring

Groove shape: Backup ring on one side (only for dynamic and cylindrical surface mount)

Groove shape: Backup ring on both sides (only for dynamic and cylindrical surface mount)

(Note) The chamfer finish is based on NOK's recommended value.

Product Specification

Material	JIS symbol	NBR-70-1	NBR-90	NBR-70-2	VMQ-70	FKM-70
	Old JIS symbol	Class 1 A	Class 1 B	Class 2	Class 4C	Class 4D
	NOK symbol	A305	A105	A122	S503	F201

Specifications Table

Part number							JIS dimension identification code		O-ring dimensions
Type Dimension code	Material code					* In the *, please enter the material code on the left	[Reference] old JIS nominal number	Thickness W	Inner diameter d0	Tolerance of inner diameter d0			Composite burr dimension f
	NBR-70-1	NBR-90	NBR-70-2	VMQ-70	FKM-70					A305 (NBR-70-1) A105 (NBR-90) A122 (NBR-70-2)	S503 (VMQ-70)	F201 (FKM-70)
	Class 1 A A305	Class 1 B A105	Class 2 A A122	Class 4C S503	Class 4D F201					A305 (NBR-70-1) A105 (NBR-90) A122 (NBR-70-2)	S503 (VMQ-70)	F201 (FKM-70)
CO00200	A	B	C	L	R6	OR * G25-N	G25	3.1 +/- 0.1	24.4	+/- 0.25	+/- 0.37	+/- 0.3	0.12 or less
CO00201					U0	OR * G30-N	G30		29.4	+/- 0.29	+/- 0.43	+/- 0.34
CO00202					U2	OR * G35-N	G35		34.4	+/- 0.33	+/- 0.49	+/- 0.39
CO00203					U2	OR * G40-N	G40		39.4	+/- 0.37	+/- 0.55	+/- 0.44
CO00204					U2	OR * G45-N	G45		44.4	+/- 0.41	+/- 0.61	+/- 0.49
CO00205					U0	OR * G50-N	G50		49.4	+/- 0.45	+/- 0.67	+/- 0.54
CO00206					R8	OR * G55-N	G55		54.4	+/- 0.49	+/- 0.73	+/- 0.58
CO00207					U0	OR * G60-N	G60		59.4	+/- 0.53	+/- 0.79	+/- 0.63
CO00208					Q6	OR * G65-N	G65		64.4	+/- 0.57	+/- 0.85	+/- 0.68
CO00209					U2	OR * G70-N	G70		69.4	+/- 0.61	+/- 0.91	+/- 0.73
CO00210					U2	OR * G75-N	G75		74.4	+/- 0.65	+/-0.97	+/- 0.78
CO00211					U2	OR * G80-N	G80		79.4	+/- 0.69	+/- 1.03	+/- 0.82
CO00212					Q1	OR * G85-N	G85		84.4	+/- 0.73	+/- 1.09	+/- 0.87
CO00213					U2	OR * G90-N	G90		89.4	+/- 0.77	+/- 1.15	+/- 0.92
CO00214					U2	OR * G95-N	G95		94.4	+/- 0.81	+/- 1.21	+/-0.97
CO00215					U2	OR * G100-N	G100		99.4	+/- 0.85	+/- 1.27	+/- 1.02
CO00216					U2	OR * G105-N	G105		104.4	+/- 0.87	+/- 1.30	+/- 1.04
CO00217					U2	OR * G110-N	G110		109.4	+/- 0.91	+/-1.36	+/- 1.09
CO00218					U2	OR * G115-N	G115		114.4	+/- 0.94	+/- 1.41	+/- 1.12
CO00219					R0	OR * G120-N	G120		119.4	+/- 0.98	+/- 1.47	+/- 1.17
CO00220					U2	OR * G125-N	G125		124.4	+/- 1.01	+/- 1.51	+/- 1.21
CO00221					U2	OR * G130-N	G130		129.4	+/- 1.05	+/- 1.57	+/- 1.26
CO00222					U2	OR * G135-N	G135		134.4	+/- 1.08	+/- 1.62	+/- 1.29
CO00223					X0	OR * G140-N	G140		139.4	+/- 1.12	+/- 1.68	+/- 1.34
CO00224					U2	OR * G145-N	G145		144.4	+/- 1.16	+/- 1.74	+/- 1.39
CO00225	A	B	C	L	U3	OR * G150-N	G150	5.7 +/- 0.13	149.3	+/- 1.19	+/- 1.78	+/- 1.42	0.16 or less
CO00226					U3	OR * G155-N	G155		154.3	+/- 1.23	+/- 1.84	+/- 1.47
CO00227					U3	OR * G160-N	G160		159.3	+/- 1.26	+/- 1.89	+/- 1.51
CO00228					U3	OR * G165-N	G165		164.3	+/- 1.30	+/- 1.95	+/- 1.56
CO00229					U3	OR * G170-N	G170		169.3	+/- 1.33	+/- 1.99	+/- 1.59
CO00230					U3	OR * G175-N	G175		174.3	+/- 1.37	+/- 2.05	+/- 1.64
CO00231					W0	OR * G180-N	G180		179.3	+/- 1.40	+/- 2.10	+/- 1.68
CO00232					U3	OR * G185-N	G185		184.3	+/- 1.44	+/- 2.16	+/- 1.72
CO00233					U3	OR * G190-N	G190		189.3	+/- 1.47	+/- 2.20	+/- 1.76
CO00234					U3	OR * G195-N	G195		194.3	+/- 1.51	+/- 2.26	+/- 1.81
CO00235					U3	OR * 200 G-N	G200		199.3	+/- 1.55	+/- 2.32	+/- 1.86
CO01968*		-	-	-	H0	OR * G205-N*	G205*		204.3	+/- 1.58	-	+/- 1.90
CO00236		B	C	L	V0	OR * G210-N	G210		209.3	+/- 1.61	+/- 2.41	+/- 1.93
CO03303*		-	-	-	O0	OR * G215-N*	G215*		214.3	+/- 1.65	-	+/- 1.98
CO00237		B	C	L	U3	OR * G220-N	G220		219.3	+/- 1.68	+/- 2.52	+/- 2.01
CO02011*		-	-	-	P0	OR * G225-N	G225*		224.3	+/- 1.71	-	+/- 2.05
CO00238		B	C	L	U3	OR * G230-N	G230		229.3	+/- 1.73	+/- 2.59	+/- 2.07
CO02031*		-	-	-	O0	OR * G235-N*	G235*		234.3	+/- 1.78	-	+/- 2.14
CO00239		B	C	L	U3	OR * G240-N	G240		239.3	+/- 1.81	+/- 2.71	+/- 2.17
CO02060*		-	-	-	G0	OR * G245-N*	G245*		244.3	+/- 1.85	-	+/- 2.22
CO00240		B	C	L	U3	OR * G250-N	G250		249.3	+/- 1.88	+/- 2.82	+/- 2.25
CO02079*		-	-	-	H0	OR * G255-N*	G255*		254.3	+/- 1.91	-	+/- 2.29
CO00241		B	C	L	U3	OR * G260-N	G260		259.3	+/- 1.94	+/- 2.91	+/- 2.32
CO06543*		-	-	-	H0	OR * G265-N*	G265*		264.3	+/- 1.98	-	+/- 2.38
CO00242		B	C	L	U3	OR * G270-N	G270		269.4	+/- 2.01	+/- 3.01	+/- 2.41
CO02100*		-	-	-	H0	OR * G275-N*	G275*		274.3	+/- 2.04	-	+/- 2.45
CO00243		B	C	L	U3	OR * G280-N	G280		279.3	+/- 2.07	+/- 3.10	+/- 2.48
CO03210*		-	-	-	H0	OR * G285-N*	G285*		284.3	+/- 2.11	-	+/- 2.53
CO00244		B	C	L	U3	OR * G290-N	G290		289.3	+/- 2.14	+/- 3.21	+/- 2.56
CO06566*		-	-	-	P0	OR * G295-N	G295*		294.3	+/- 2.17	-	+/- 2.60
CO00245		B	C	L	U3	OR * G300-N	G300		299.3	+/- 2.20	+/- 3.30	+/- 2.64
CO01137*		-	-	-	G0	OR * G305-N*	G305*		304.3	+/-2.24	-	+/- 2.69
CO02158*						OR * G310-N*	G310*		309.3	+/-2.27		+/-2.72
CO08811*						OR * G315-N*	G315*		314.3	+/- 2.30		+/- 2.76
CO02176*						OR * G320-N*	G320*		319.3	+/- 2.33		+/- 2.80
CO08812*						OR * G325-N*	G325*		324.3	+/- 2.36		+/-2.83
CO08813*						OR * G330-N*	G330*		329.3	+/- 2.39		+/- 2.87
CO08814*						OR * G335-N*	G335*		334.3	+/- 2.42		+/- 2.90
CO02206*						OR * G340-N*	G340*		339.3	+/- 2.45		+/- 2.94
CO02216*						OR * G345-N*	G345*		344.3	+/- 2.48		+/- 2.98
CO02223*						OR * G350-N*	G350*		349.3	+/- 2.51		+/- 3.01
CO08815*						OR * G355-N*	G355*		354.3	+/- 2.54		+/- 3.05
CO02244*						OR * G360-N*	G360*		359.3	+/- 2.57		+/- 3.08
CO08816*						OR * G365-N*	G365*		364.4	+/- 2.60		+/- 3.12
CO08817*						OR * G370-N*	G370*		369.3	+/- 2.63		+/- 3.16
CO08818*						OR * G375-N*	G375*		374.3	+/- 2.67		+/- 3.20
CO02272*						OR * G380-N*	G380*		379.3	+/- 2.70		+/- 3.24
CO08819*						OR * G385-N*	G385*		384.3	+/- 2.73		+/- 3.28
CO02287*						OR * G390-N*	390 G*		389.3	+/- 2.77		+/- 3.32
CO08820*						OR * G395-N*	G395*		394.3	+/- 2.79		+/- 3.35
CO02301*						OR * G400-N*	G400*		399.3	+/- 2.82		+/- 3.38
CO08821*						OR * G405-N*	G405*		404.3	+/- 3.00		+/- 3.60	0.16 or less
CO08822*						OR * G410-N*	G410*		409.3
CO02336*						OR * G415-N*	G415*		414.3
CO08823*						OR * G420-N*	G420*		419.3
CO02358*						OR * G425-N*	G425*		424.3
CO08824*						OR * G430-N*	G430*		429.3
CO08825*						OR * G435-N*	G435*		434.3
CO08826*						OR * G440-N*	G440*		439.3
CO08827*						OR * G445-N*	G445*		444.3
CO02417*						OR * G450-N*	G450*		449.3
CO08828*						OR * G455-N*	G455*		454.3	+/- 3.30		+/- 4.00	0.16 or less
CO02441*						OR * G460-N*	G460*		459.3
CO06715*						OR * G465-N*	G465*		464.3
CO02460*	OR * G470-N*					G470*	469.3
CO08829*	OR * G475-N*					G475*	474.3
CO08830*	OR * G480-N*					G480*	479.3
CO08831*	OR * G485-N*					G485*	484.3
CO08832*	OR * G490-N*					G490*	489.3
CO08833*	OR * G495-N*					G495*	494.3
CO08834*	OR * G500-N*					G500*	499.3

The JIS dimension identification code represents model + material standard + dimension standard + class of product appearance.
For nominal numbers with *, the rubber materials are limited to A305 and F201 only.
JASO also has the same dimensions, and has class 3 (SBR material), class 4 E, class 5, and H materials.

JIS nominal number	Groove section dimensions
	d Dimension		D dimension		G dimension (tolerance	+0.25 0	)	H Dimension	R dimension	Max misalignment (TIR) of D and d for cylindrical surface mount and dynamic
	Dimensions	Tolerance	Dimensions	Tolerance	No backup ring	Backup ring on one side	Backup ring on both sides	H +/- 0.05	Maximum value
G25	25	0 -0.10	30	+0.10 0	4.1	5.6	7.3	2.4	0.7	0.08
G30	30		35
G35	35		40
G40	40		45
G45	45		50
G50	50		55
G55	55		60
G60	60		65
G65	65		70
G70	70		75
G75	75		80
G80	80		85
G85	85		90
G90	90		95
G95	95		100
G100	100		105
G105	105		110
G110	110		115
G115	115		120
G120	120		125
G125	125		130
G130	130		135
G135	135		140
G140	140		145
G145	145		150
G150	150	0 -0.10	160	+0.10 0	7.5	9.0	11.5	4.6	0.8	0.10
G155	155		165
G160	160		170
G165	165		175
G170	170		180
G175	175		185
G180	180		190
G185	185		195
G190	190		200
G195	195		205
G200	200		210
G205	205		215
G210	210		220
G215	215		225
G220	220		230
G225	225		235
G230	230		240
G235	235		245
G240	240		250
G245	245		255
G250	250		260
G255	255		265
G260	260		270
G265	265		275
G270	270		280
G275	275		285
G280	280		290
G285	285		295
G290	290		300
G295	295		305
G300	300		310
G305	305		315
G310	310		320
G315	315		325
G320	320		330
G325	325		335
G330	330		340
G335	335		345
G340	340		350
G345	345		355
G350	350		360
G355	355		365
G360	360		370
G365	365		375
G370	370		380
G375	375		385
G380	380		390
G385	385		395
390G	390		400
G395	395		405
G400	400		410
G405	405		415
G410	410		420
G415	415		425
G420	420		430
G425	425		435
G430	430		440
G435	435		445
G440	440		450
G445	445		455
G450	450		460
G455	455		465
G460	460		470
G465	465		475
G470	470	480
G475	475	485
G480	480	490
G485	485	495
G490	490	500
G495	495	505
G500	500	510

Selection Support

O-Ring Selection Method

An O-ring is an annular packing with an O-shaped (circular) cross section, and is generally fitted in a groove and compressed appropriately to seal a wide variety of fluids such as oil, water, air, and gas.
Available for fixing and dynamic applications. If not suitable for usage conditions, cutting, swelling, pressing crack, etc., will occur.
In order to maintain the same sealing performance over a long period of time, it is necessary to select materials and dimensions suitable for the usage conditions.

When making a selection, it is necessary to consider the contents of Table 1-1.

Table 1-1

Items	Catalog page	Purpose
a Operating temperature	8	Materials selection
b Object to be sealed	9	Materials selection
c Pressure magnitude	15	Selection of material hardness. Necessity of backup ring.
d Instructions (for dynamic/fixing)	22 to 59, 64	For fixing: JIS P/G/V series, NOK S/SS series, AS568 series, former JASO series, ISO equivalent series, WEX series, NOK polyurethane elastomer material P/G series, SP treatment O-ring series

Model number display

When ordering, specify (1) the JIS dimension identification code and (2) the NOK part number.

Example 1) If you want to purchase NBR-70-1 material with an inner diameter of 24.4 and a thickness of 3.1

JIS dimension identification code: OR NBR-70-1 G25-N
NOK part number: CO 00200 A

Example 2) If you want to purchase FKMI-70 material with an inner diameter of 24.4 and a thickness of 3.1

JIS dimension identification code: OR FKM-70 G25-N
NOK part number: CO 00200 R6

Cautions and Prohibitions

Precautions for storage and storage period

Please note the following points when storing O-rings.

Do not open the package unnecessarily. Contaminant or dust may stick to it, or it may be scratched.
When storing a product that has been opened, be careful not to let contaminant or dust adhere to it or mix it in, or scratch it.
Store it in a place away from direct sunlight with low humidity. Ultraviolet ray and moisture can accelerate the deterioration and dimensional changes of rubber materials.
Do not place it near high temperature heat sources (boilers, stoves, etc.). Heat can accelerate the deterioration of rubber materials.
Do not hang the O-ring on a nail, steel wire, etc., or hang it on a string, as this may cause the O-ring to deform.
Nitrile rubber (NBR) and styrene-butadiene rubber (SBR) may develop ozone cracks (cleavage-like cracks across the entire O-ring surface) when stored in an open or otherwise exposed state to the air.
In particular, avoid storing in the following conditions, as it will accelerate the occurrence of such cracks.
Storing near electric motors (copy machines, etc.) that generate ozone easily.
Storing of the product while it is stretched. (This includes storing with the O-ring installed.)

Storage period

Product	Material	Storage period
Single rubber product	Nitrile rubber (NBR)	10 years
	Silicone rubber (VMQ)	20 years
	Fluoroelastomer (FKM)	20 years

The storage period are for products that are stored indoors in standard packaging, away from direct sunlight, high temperatures, and high humidity.

Behind the Scenes

NOK has established the Shonan Development Center to further reinforce the material technologies it has cultivated over many years.
NOK believes that this center can conduct more comprehensive basic research than ever before, and that the company has established a system that enables it to develop materials that meet an even greater variety of uses and requirements.
In addition, NOK is expanding internationally through its global branches and also completely rebuilt Kumamoto Plant, the hub of the O-ring production in April 2007,
with the aim of making a further leap forward. NOK is proud that this new plant is in a state where the company can aim for further quality improvement and stability by creating a better premises environment.
NOK's o-rings have already earned the trust of a wide range of industries around the world, but the company is not satisfied with the current situation and would like to continue to meet the diversifying and sophisticated needs of customers through continuous material development and production of highly reliable and high-quality o-rings.