Confirmed

Inner Dia. do (or d)(mm)
- 22.1
Wire Dia. W(mm)
- 3.5
Material
Nitrile Rubber
Application
JIS Nominal Number
- P22.4
Type
- NPA
CAD
- 2D
- 3D
Est. shipping days
- All
- Same-day shipping possible

O-Rings / P Series (NPA22.4)

CatalogP.2-1423

Part number:

NPA22.4

Clear

Outline drawing and specifications table
Part number list
More Information
Catalog

Outline drawing and specifications table

Dimensional Drawings

P Series
NPA, NPB, NPSW, NPSK, NPF, NPFH, NPEG

Back-Up Ring
NPBR

For surface mounting /
For external pressure

For surface mounting /
For internal pressure

For Fixing Cylinder Surface

For Motion

No Back-Up Ring

Back-Up Ring on One Side

Back-Up Rings on Both Sides

Detailed Fitting Size

Type	No,	G Dimension (Tolerance + 0.25 0)			H Dimension H±0.05	R Dimension Max. Value
Type	No,	No Back-Up Ring	Back-Up Ring on One Side	Back-Up Rings on Both Sides	H Dimension H±0.05	R Dimension Max. Value
NPA NPB NPSW NPSK NPF NPFH NPEG	3 to 10	2.5	3.9	5.4	1.4	0.4
	10 A to 22	3.2	4.4	6.0	1.8	0.4
	22 A to 50	4.7	6.0	7.8	2.7	0.8
	50 A to 80	7.5	9.0	11.5	4.6	0.9

(1) For O-rings for surface mounting, design the piping system in such a way that, when the internal pressure is applied, the outer circumference of O-rings is put in close contact with the outer wall of the groove; and when an external pressure is applied, the inner circumference of O-rings is put in close contact with the inner wall of the groove.
(2) When using an O-ring for surface mounting for an internal pressure, if the length of D is 30 mm or less, make the length approximately 0.2 to 0.3 mm longer.
(3) The groove dimensions are for reference.

Product Specifications

Type	[M] Material	JIS Material Identification Symbol	[H]Hardness (JIS Hs)	Color	Operable Temperature Range	Old JIS Symbol	Applications:	Features
NPA	Nitrile Rubber	NBR-70-1	70±5	Black	－30 to 100°C	Class 1 A	Mineral Oil Resistant	Most representative material with superior oil / abrasion resistance and heat stability.
NPB	Nitrile Rubber	NBR-90	90±5	Black	－25 to 100°C	Class 1 B	Mineral Oil Resistant
NPSW	Silicon Rubber	-	50±5	Milky White	－50 to 200°C	—	Heat Resistant	Having excellent high and low temperature resistances, this material covers the widest range of operating temperatures among synthetic rubbers. NPSW is semitransparent and there are individual differences in color. NPSW and NPSK conform to Food Sanitation Act.
NPSK	Silicon Rubber	VMQ-70	70±5	Scarlet Red	－50 to 200°C	Class 4 C	Heat Resistant
NPF	Fluoro Rubber	FKM-70	70±5	Black	－15 to 200°C	Class 4 D	Heat Resistant	Best in oil / chemical resistance and heat stability as synthetic rubber. Suitable for a wide range of applications. Chemical Resistance (Reference)
NPFH	Fluoro Rubber	FKM-90	90±5	Black	－15 to 200°C	—	Heat Resistant
NPEG	Ethylene Propylene Rubber	EPDM-70	70±5	Black	－45 to 130°C	—	For weather resistant items	Excellent material in weather resistance, ozone resistance and electrical characteristics.
NPBR	Fluororesin	-	-	White	Subject to O-ring	—	For high voltage use	Used when the pressure resistance of O-ring is insufficient.

[ ! ] There are individual differences in whether the surface is glossy or not.
[ ! ] The service life is not constant depending on the operating environment.
* Please also consider products that are heat resistant and chemical resistant.

Specification Table

Part Number

NPA3

JIS B 2401 P Series O-Ring (For Mounting, Dynamic)

Part Number		JIS	W	I.D.				Matching Material
Type	No.	Nominal		do	NPA·NPB	NPSK·NPSW	NPF·NPFH	d	Tolerance	D	Tolerance
		Number			Tolerance	NPEG	Tolerance
						Tolerance
NPA	3	P3	1.9±0.08	2.8	±0.14	±0.21	±0.16	3	0 -0.05	6	+0.05 0
(Nitrile Rubber, Black)	4	P4		3.8	±0.14	±0.21	±0.16	4		7
	5	P5		4.8	±0.15	±0.22	±0.18	5		8
	6	P6		5.8	±0.15	±0.22	±0.18	6		9
NPB	7	P7		6.8	±0.16	±0.24	±0.19	7		10
(Nitrile Rubber, Black)	8	P8		7.8	±0.16	±0.24	±0.19	8		11
	9	P9		8.8	±0.17	±0.25	±0.20	9		12
	10	P10		9.8				10		13
NPSW	10 A	P10A	2.4±0.09	9.8				10	0 -0.06	14	+0.06 0
(Silicon Rubber, Milky White)	11	P11		10.8	±0.18	±0.27	±0.21	11		15
	11.2	P11.2		11.0	±0.18	±0.27	±0.21	11.2		15.2
	12	P12		11.8	±0.19	±0.28	±0.22	12		16
NPSK	12.5	P12.5		12.3				12.5		16.5
(Silicon Rubber, Vermilion)	14	P14		13.8				14		18
	15	P15		14.8	±0.20	±0.30	±0.24	15		19
	16	P16		15.8	±0.20	±0.30	±0.24	16		20
NPF	18	P18		17.8	±0.21	±0.31	±0.25	18		22
(Fluoro Rubber, Black)	20	P20		19.8	±0.22	±0.33	±0.26	20		24
	21	P21		20.8	±0.23	±0.34	±0.27	21		25
	22	P22		21.8	±0.24	±0.36	±0.28	22		26
NPFH	22 A	P22A	3.5±0.1	21.7				22	0 -0.08	28	+0.08 0
(Fluoro Rubber, Black)	22.4	P22.4		22.1				22.4		28.4
	24	P24		23.7				24		30
	25	P25		24.7	±0.25	±0.37	±0.30	25		31
NPEG	25.5	P25.5		25.2	±0.25	±0.37	±0.30	25.5		31.5
(Ethylene Propylene Rubber, Black)	26	P26		25.7	±0.26	±0.39	±0.31	26		32
	28	P28		27.7	±0.28	±0.42	±0.33	28		34
	29	P29		28.7	±0.29	±0.43	±0.34	29		35
	29.5	P29.5		29.2				29.5		35.5
	30	P30		29.7				30		36
	31	P31		30.7	±0.30	±0.45	±0.36	31		37
	31.5	P31.5		31.2	±0.31	±0.46	±0.37	31.5		37.5
	32	P32		31.7	±0.31	±0.46	±0.37	32		38
	34	P34		33.7	±0.33	±0.49	±0.39	34		40
	35	P35		34.7	±0.34	±0.51	±0.40	35		41
	35.5	P35.5		35.2				35.5		41.5
	36	P36		35.7				36		42
	38	P38		37.7	±0.37	±0.55	±0.44	38		44
	39	P39		38.7				39		45
	40	P40		39.7				40		46
	41	P41		40.7	±0.38	±0.57	±0.45	41		47
	42	P42		41.7	±0.39	±0.58	±0.48	42		48
	44	P44		43.7	±0.41	±0.61	±0.49	44		50
	45	P45		44.7	±0.41	±0.61	±0.49	45		51
	46	P46		45.7	±0.42	±0.63	±0.50	46		52
	48	P48		47.7	±0.44	±0.66	±0.52	48		54
	50	P50		49.7	±0.45	±0.67	±0.54	50		56
	50 A	P50A	5.7±0.13	49.7	±0.45	±0.67	±0.54	50	0 -0.10	60	+0.10 0
	52	P52		51.6	±0.47	±0.70	±0.56	52		62
	53	P53		52.6	±0.48	±0.72	±0.57	53		63
	55	P55		54.6	±0.49	±0.73	±0.58	55		65
	56	P56		55.6	±0.50	±0.75	±0.60	56		66
	58	P58		57.6	±0.52	±0.78	±0.62	58		68
	60	P60		59.6	±0.53	±0.79	±0.63	60		70
	62	P62		61.6	±0.55	±0.82	±0.66	62		72
	63	P63		62.6	±0.56	±0.84	±0.67	63		73
	65	P65		64.6	±0.57	±0.85	±0.68	65		75
	67	P67		66.6	±0.59	±0.88	±0.70	67		77
	70	P70		69.6	±0.61	±0.91	±0.73	70		80
	71	P71		70.6	±0.62	±0.93	±0.74	71		81
	75	P75		74.6	±0.65	±0.97	±0.78	75		85
	80	P80		79.6	±0.69	±1.03	±0.82	80		90

JIS B 2407 Back-Up Rings (For the P Series, Bias Cut)

Part Number		Applicable O-rings Nominal Number	W		d		D		T
Type	No.	Applicable O-rings Nominal Number	W		d		D		T
NPBR (Fluororesin, White)	15	P15	2.0	+0.03 －0.05	15	+0.15 0	19	0 －0.15	1.25	±0.1
	16	P16			16		20
	18	P18			18		22
	20	P20			20		24
	21	P21			21		25
	22	P22			22		26
	22 A	P22A	3.0		22	+0.20 0	28	0 －0.20
	24	P24			24		30
	25	P25			25		31
	26	P26			26		32
	28	P28			28		34
	30	P30			30		36
	32	P32			32		38
	34	P34			34		40
	38	P38			38		44
	40	P40			40		46
	42	P42			42		48
	48	P48			48		54
	50	P50			50		56

Technical Information

■Chemical Resistance (Reference)

Type	Material	Gasoline / Light Oil	Water	Strong Acid	Strong Alkali	Ether	Ketone
NPA NPB	Nitrile Rubber	△	○	△	○	△	×
NPSW NPSK	Silicon Rubber	×	○	×	○	△	○
NPF NPFH	Fluoro Rubber	○	○	×	○	△	×
NPEG	Ethylene Propylene Rubber	×	○	○	○	○	○
NPBR	Fluororesin	Subject to O-ring

○= Good △ = Acceptable × = Not Acceptable
Since no data is available, general information is provided. Not guaranteed values.

Product Specifications

Part number list

Number of items

Part number

NPA22.4

Inner Dia. do (or d)

(mm)

Wire Dia. W

(mm)

Material

Application

Material Code, JIS

O.D.

(Ø)

JIS Nominal Number

Applicable O-Ring Nominal Number

Minimum order quantity

22.1

3.5

Nitrile Rubber

Mineral Oil Resistant / Heat Resistant / Abrasion Resistance

Class 1 A

P22.4

1 pieces

Unit price (excluding VAT)(Unit price including VAT)	Standard shipping days

0.38 €

( 0.45 € )

Stock item: 1 working dayAvailable for same-day shipping

More Information

Basic information

Basic information

[One O-ring, P series.

Catalog

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Part number has been confirmed