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Japanese Metric O-Rings (JIS) and Sizes

The Japanese Industrial Standard (JIS B 2401) contains three groups; aerospace group, general purpose group, and traditional group. These o-ring sizes are unique to Japan’s automotive, semiconductor, and manufacturing industries.

JIS O-Ring Groups
Aerospace Group367 sizes and follows ISO 3601-1 very closely (with a few extra sizes).
Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter “A” is appended to indicate use in aerospace applications.
General Purpose GroupContains 445 sizes and matches ISO 3601-1 very closely (with a few extra sizes).
Each size is designated by its dimension: ID × cross-section. Subsequent to the dimension, the letter “G” is appended to indicate use in general purpose applications.
Traditional GroupContains 194 sizes
Each size is designated by a letter followed by a nominal number. 

Letter indicates the intended application: “P” – dynamic; “G” – static; “V” – vacuum flange.

Listed below are size charts from the traditional group.

TRADITIONAL P SERIES (DYNAMIC)

SizeID
(mm)
+/-C/S (W)
(mm)
ID (inches)+/-C/S (W) (inches)+/-
P-32.80.121.90.1100.0050.0750.003
P-43.80.121.90.1500.0050.0750.003
P-54.80.121.90.1890.0050.0750.003
P-65.80.121.90.2280.0050.0750.003
P-76.80.121.90.2680.0050.0750.003
P-87.80.121.90.3070.0050.0750.003
P-98.80.121.90.3460.0050.0750.003
P-109.80.121.90.3860.0050.0750.003
P-10A9.80.122.40.3860.0050.0940.003
P-1110.80.122.40.4250.0050.0940.003
P-11.211.00.122.40.4330.0050.0940.003
P-1211.80.122.40.4650.0050.0940.003
P-12.512.30.122.40.4840.0050.0940.003
P-1413.80.122.40.5430.0050.0940.003
P-1514.80.122.40.5830.0050.0940.003
P-1615.80.122.40.6220.0050.0940.003
P-1817.80.122.40.7010.0050.0940.003
P-2019.80.152.40.7800.0060.0940.003
P-2120.80.152.40.8190.0060.0940.003
P-2221.80.152.40.8580.0060.0940.003
P-22A21.70.153.50.8540.0060.1380.004
P-22.422.10.153.50.8700.0060.1380.004
P-2423.70.153.50.9330.0060.1380.004
P-2524.70.153.50.9720.0060.1380.004
P-25.525.20.153.50.9920.0060.1380.004
P-2625.70.153.51.0120.0060.1380.004
P-2827.70.153.51.0910.0060.1380.004
P-2928.70.153.51.1300.0060.1380.004
P-29.529.20.153.51.1500.0060.1380.004
P-3029.70.153.51.1690.0060.1380.004
P-3130.70.153.51.2090.0060.1380.004
P-31.531.20.153.51.2280.0060.1380.004
P-3231.70.153.51.2480.0060.1380.004
P-3433.70.153.51.3270.0060.1380.004
P-3534.70.153.51.3660.0060.1380.004
P-35.535.20.153.51.3860.0060.1380.004
P-3635.70.153.51.4060.0060.1380.004
P-3837.70.153.51.4840.0060.1380.004
P-3938.70.153.51.5240.0060.1380.004
P-4039.70.153.51.5630.0060.1380.004
P-4140.70.253.51.6020.0100.1380.004
P-4241.70.253.51.6420.0100.1380.004
P-4443.70.253.51.7200.0100.1380.004
P-4544.70.253.51.7600.0100.1380.004
P-4645.70.253.51.7990.0100.1380.004
P-4847.70.253.51.8780.0100.1380.004
P-4948.70.253.51.9170.0100.1380.004
P-5049.70.253.51.9570.0100.1380.004
P-48A47.60.255.71.8740.0100.2240.006
P-50A49.60.255.71.9530.0100.2240.006
P-5251.60.255.72.0310.0100.2240.006
P-5352.60.255.72.0710.0100.2240.006
P-5554.60.255.72.1500.0100.2240.006
P-5655.60.255.72.1890.0100.2240.006
P-5857.60.255.72.2680.0100.2240.006
P-6059.60.255.72.3460.0100.2240.006
P-6261.60.255.72.4250.0100.2240.006
P-6362.60.255.72.4650.0100.2240.006
P-6564.60.255.72.5430.0100.2240.006
P-6766.60.255.72.6220.0100.2240.006
P-7069.60.255.72.7400.0100.2240.006
P-7170.60.405.72.7800.0160.2240.006
P-7574.60.405.72.9370.0160.2240.006
P-8079.60.405.73.1340.0160.2240.006
P-8584.60.405.73.3310.0160.2240.006
P-9089.60.405.73.5280.0160.2240.006
P-9594.60.405.73.7240.0160.2240.006
P-10099.60.405.73.9210.0160.2240.006
P-102101.60.405.74.0000.0160.2240.006
P-105104.60.405.74.1180.0160.2240.006
P-110109.60.405.74.3150.0160.2240.006
P-112111.60.405.74.3940.0160.2240.006
P-115114.60.405.74.5120.0160.2240.006
P-120119.60.405.74.7090.0160.2240.006
P-125124.60.405.74.9060.0160.2240.006
P-130129.60.605.75.1020.0240.2240.006
P-132131.60.605.75.1810.0240.2240.006
P-135134.60.605.75.2990.0240.2240.006
P-140139.60.605.75.4960.0240.2240.006
P-145144.60.605.75.6930.0240.2240.006
P-150149.60.605.75.8900.0240.2240.006
P-150A149.50.608.45.8860.0240.3310.006
P-155154.50.608.46.0830.0240.3310.006
P-160159.50.608.46.2800.0240.3310.006
P-165164.50.608.46.4760.0240.3310.006
P-170169.50.608.46.6730.0240.3310.006
P-175174.50.608.46.8700.0240.3310.006
P-180179.50.608.47.0670.0240.3310.006
P-185184.50.808.47.2640.0310.3310.006
P-190189.50.808.47.4610.0310.3310.006
P-195194.50.808.47.6570.0310.3310.006
P-200199.50.808.47.8540.0310.3310.006
P-205204.50.808.48.0510.0310.3310.006
P-209208.50.808.48.2090.0310.3310.006
P-210209.50.808.48.2480.0310.3310.006
P-215214.50.808.48.4450.0310.3310.006
P-220219.50.808.48.6420.0310.3310.006
P-225224.50.808.48.8390.0310.3310.006
P-230229.50.808.49.0350.0310.3310.006
P-235234.50.808.49.2320.0310.3310.006
P-240239.50.808.49.4290.0310.3310.006
P-245244.50.808.49.6260.0310.3310.006
P-250249.50.808.49.8230.0310.3310.006
P-255254.50.808.410.0200.0310.3310.006
P-260259.50.808.410.2170.0310.3310.006
P-265264.50.808.410.4130.0310.3310.006
P-270269.50.808.410.6100.0310.3310.006
P-275274.50.808.410.8070.0310.3310.006
P-280279.50.808.411.0040.0310.3310.006
P-285284.50.808.411.2010.0310.3310.006
P-290289.50.808.411.3980.0310.3310.006
P-295294.50.808.411.5940.0310.3310.006
P-300299.50.808.411.7910.0310.3310.006
P-315314.51.008.412.3820.0390.3310.006
P-320319.51.008.412.5790.0390.3310.006
P-335334.51.008.413.1690.0390.3310.006
P-340339.51.008.413.3660.0390.3310.006
P-355354.51.008.413.9570.0390.3310.006
P-360359.51.008.414.1540.0390.3310.006
P-375374.51.008.414.7440.0390.3310.006
P-385384.51.008.415.1380.0390.3310.006
P-400399.51.008.415.7280.0390.3310.006

TRADITIONAL G SERIES (STATIC)

SizeID

(mm)
+/-C/S (W)

(mm)
ID

(inches)
+/-C/S (W)

(inches)
+/-
G-2524.40.153.10.9610.0060.1220.004
G-3029.40.153.11.1570.0060.1220.004
G-3534.40.153.11.3540.0060.1220.004
G-4039.40.153.11.5510.0060.1220.004
G-4544.40.253.11.7480.0100.1220.004
G-5049.40.253.11.9450.0100.1220.004
G-5554.40.253.12.1420.0100.1220.004
G-6059.40.253.12.3390.0100.1220.004
G-6564.40.253.12.5350.0100.1220.004
G-7069.40.253.12.7320.0100.1220.004
G-7574.40.403.12.9290.0160.1220.004
G-8079.40.403.13.1260.0160.1220.004
G-8584.40.403.13.3230.0160.1220.004
G-9089.40.403.13.5200.0160.1220.004
G-9594.40.403.13.7170.0160.1220.004
G-10099.40.403.13.9130.0160.1220.004
G-105104.40.403.14.1100.0160.1220.004
G-110109.40.403.14.3070.0160.1220.004
G-115114.40.403.14.5040.0160.1220.004
G-120119.40.403.14.7010.0160.1220.004
G-125124.40.403.14.8980.0160.1220.004
G-130129.40.603.15.0940.0240.1220.004
G-135134.40.603.15.2910.0240.1220.004
G-140139.40.603.15.4880.0240.1220.004
G-145144.40.603.15.6850.0240.1220.004
G-150149.30.605.75.8780.0240.2240.006
G-155154.30.605.76.0750.0240.2240.006
G-160159.30.605.76.2720.0240.2240.006
G-165164.30.605.76.4690.0240.2240.006
G-170169.30.605.76.6650.0240.2240.006
G-175174.30.605.76.8620.0240.2240.006
G-180179.30.605.77.0590.0240.2240.006
G-185184.30.805.77.2560.0310.2240.006
G-190189.30.805.77.4530.0310.2240.006
G-195194.30.805.77.6500.0310.2240.006
G-200199.30.805.77.8460.0310.2240.006
G-210209.30.805.78.2400.0310.2240.006
G-220219.30.805.78.6340.0310.2240.006
G-230229.30.805.79.0280.0310.2240.006
G-240239.30.805.79.4210.0310.2240.006
G-250249.30.805.79.8150.0310.2240.006
G-255254.30.805.710.0120.0310.2240.006
G-260259.30.805.710.2090.0310.2240.006
G-270269.30.805.710.6020.0310.2240.006
G-280279.30.805.710.9960.0310.2240.006
G-290289.30.805.711.3900.0310.2240.006
G-300299.30.805.711.7830.0310.2240.006

TRADITIONAL V SERIES (VACUUM)

SizeID (mm)+/-C/S (W)

(mm)
ID

(inches)
+/-C/S (W)

(inches)
+/-
V-1514.50.154.00.5710.0060.1570.004
V-2423.50.154.00.9250.0060.1570.004
V-3433.50.154.01.3190.0060.1570.004
V-4039.50.154.01.5550.0060.1570.004
V-5554.50.254.02.1460.0100.1570.004
V-7069.00.254.02.7170.0100.1570.004
V-8584.00.404.03.3070.0160.1570.004
V-10099.00.404.03.8980.0160.1570.004
V-120119.00.404.04.6850.0160.1570.004
V-150148.50.604.05.8460.0240.1570.004
V-175173.00.604.06.8110.0240.1570.004
V-225222.50.806.08.7600.0310.2360.006
V-275272.00.806.010.7090.0310.2360.006
V-325321.51.006.012.6570.0390.2360.006
V-380376.01.006.014.8030.0390.2360.006
V-430425.51.206.016.7520.0470.2360.006
V-480475.01.2010.018.7010.0470.3940.012
V-530524.51.6010.020.6500.0630.3940.012
V-585579.01.6010.022.7950.0630.3940.012
V-640633.51.6010.024.9410.0630.3940.012
V-690683.01.6010.026.8900.0630.3940.012
V-740732.52.0010.028.8390.0790.3940.012
V-790782.02.0010.030.7870.0790.3940.012
V-845836.52.0010.032.9330.0790.3940.012
V-950940.52.5010.037.0280.0980.3940.012
V-10551044.03.0010.041.1020.1180.3940.012

TRADITIONAL S SERIES

SizeID

(mm)
+/-C/S (W)

(mm)
ID

(inches)
+/-C/S (W)

(inches)
+/-
S-32.50.151.50.0980.0060.0590.004
S-43.50.151.50.1380.0060.0590.004
S-54.50.151.50.1770.0060.0590.004
S-65.50.151.50.2170.0060.0590.004
S-76.50.151.50.2560.0060.0590.004
S-87.50.151.50.2950.0060.0590.004
S-98.50.151.50.3350.0060.0590.004
S-109.50.151.50.3740.0060.0590.004
S-11.210.70.151.50.4210.0060.0590.004
S-1211.50.151.50.4530.0060.0590.004
S-12.512.00.151.50.4720.0060.0590.004
S-1413.50.151.50.5310.0060.0590.004
S-1514.50.151.50.5710.0060.0590.004
S-1615.50.151.50.6100.0060.0590.004
S-1817.50.151.50.6890.0060.0590.004
S-2019.50.151.50.7680.0060.0590.004
S-2221.50.151.50.8460.0060.0590.004
S-22.421.90.152.00.8620.0060.0790.004
S-2423.50.152.00.9250.0060.0790.004
S-2524.50.152.00.9650.0060.0790.004
S-2625.50.152.01.0040.0060.0790.004
S-2827.50.152.01.0830.0060.0790.004
S-2928.50.152.01.1220.0060.0790.004
S-3029.50.152.01.1610.0060.0790.004
S-31.531.00.152.01.2200.0060.0790.004
S-3231.50.152.01.2400.0060.0790.004
S-3433.50.152.01.3190.0060.0790.004
S-3534.50.152.01.3580.0060.0790.004
S-35.535.00.152.01.3780.0060.0790.004
S-3635.50.152.01.3980.0060.0790.004
S-3837.50.152.01.4760.0060.0790.004
S-3938.50.152.01.5160.0060.0790.004
S-4039.50.152.01.5550.0060.0790.004
S-4241.50.252.01.6340.0100.0790.004
S-4443.50.252.01.7130.0100.0790.004
S-4544.50.252.01.7520.0100.0790.004
S-4645.50.252.01.7910.0100.0790.004
S-4847.50.252.01.8700.0100.0790.004
S-5049.50.252.01.9490.0100.0790.004
S-5352.50.252.02.0670.0100.0790.004
S-5554.50.252.02.1460.0100.0790.004
S-5655.50.252.02.1850.0100.0790.004
S-6059.50.252.02.3430.0100.0790.004
S-6362.50.252.02.4610.0100.0790.004
S-6564.50.252.02.5390.0100.0790.004
S-6766.50.252.02.6180.0100.0790.004
S-7069.50.252.02.7360.0100.0790.004
S-7170.50.402.02.7760.0160.0790.004
S-7574.50.402.02.9330.0160.0790.004
S-8079.50.402.03.1300.0160.0790.004
S-8584.50.402.03.3270.0160.0790.004
S-9089.50.402.03.5240.0160.0790.004
S-9594.50.402.03.7200.0160.0790.004
S-10099.50.402.03.9170.0160.0790.004
S-105104.50.402.04.1140.0160.0790.004
S-110109.50.402.04.3110.0160.0790.004
S-112111.50.402.04.3900.0160.0790.004
S-115114.50.402.04.5080.0160.0790.004
S-120119.50.402.04.7050.0160.0790.004
S-125124.50.402.04.9020.0160.0790.004
S-130129.50.602.05.0980.0240.0790.004
S-132131.50.602.05.1770.0240.0790.004
S-135134.50.602.05.2950.0240.0790.004
S-140139.50.602.05.4920.0240.0790.004
S-145144.50.602.05.6890.0240.0790.004
S-150149.50.602.05.8860.0240.0790.004