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JASO F404 O-Ring Size Chart

Complete JASO F404 (Japan Automotive Standards Organisation) O-ring dimensional reference — inside diameter (ID), cross-section (CS) and tolerances in millimetres and inches, as manufactured by FITCO. Used primarily in Japanese-designed automotive and automotive-adjacent equipment.

Source: JASO F404 dimensional standard, cross-referenced against FITCO's manufacturing range. This table is provided for engineering reference only. For a production order, confirm the exact size, tolerance class and compound with FITCO's engineering team.

JASO F404 (Japan Automotive Standards Organisation)

1000 series (CS 1.90mm)

SizeID (mm)± (mm)CS (mm)± (mm)ID (in)± (in)CS (in)± (in)
10032.800.131.900.080.1100.0050.0750.003
10043.800.141.900.080.1500.0060.0750.003
10054.800.151.900.080.1890.0060.0750.003
10065.800.161.900.080.2280.0060.0750.003
10076.800.171.900.080.2680.0070.0750.003
10087.800.171.900.080.3070.0070.0750.003
10098.800.181.900.080.3460.0070.0750.003
10109.800.191.900.080.3860.0070.0750.003
101111.000.201.900.080.4330.0080.0750.003
101212.300.211.900.080.4840.0080.0750.003
101313.000.211.900.080.5120.0080.0750.003
101413.800.221.900.080.5430.0090.0750.003
101514.800.231.900.080.5830.0090.0750.003
101615.800.231.900.080.6220.0090.0750.003
101716.800.241.900.080.6610.0100.0750.003
101817.800.251.900.080.7010.0100.0750.003
101918.800.261.900.080.7400.0100.0750.003
102019.800.261.900.080.7800.0100.0750.003
102121.000.271.900.080.8270.0110.0750.003
102222.100.281.900.080.8700.0110.0750.003
102323.300.291.900.080.9170.0110.0750.003
102524.700.301.900.080.9720.0120.0750.003
102626.200.311.900.081.0310.0120.0750.003
102827.700.321.900.081.0910.0130.0750.003
103029.700.341.900.081.1690.0130.0750.003
103131.200.351.900.081.2280.0140.0750.003
103333.200.361.900.081.3070.0140.0750.003
103535.200.381.900.081.3860.0150.0750.003

JASO F404 (Japan Automotive Standards Organisation)

2000 series (CS 2.40mm)

SizeID (mm)± (mm)CS (mm)± (mm)ID (in)± (in)CS (in)± (in)
20109.800.192.400.090.3860.0070.0940.004
201111.000.202.400.090.4330.0080.0940.004
201212.300.212.400.090.4840.0080.0940.004
201313.000.212.400.090.5120.0080.0940.004
201413.800.222.400.090.5430.0090.0940.004
201514.800.232.400.090.5830.0090.0940.004
201615.800.232.400.090.6220.0090.0940.004
201716.800.242.400.090.6610.0090.0940.004
201817.800.252.400.090.7010.0100.0940.004
201918.800.262.400.090.7400.0100.0940.004
202019.800.262.400.090.7800.0100.0940.004
202120.800.272.400.090.8190.0110.0940.004
202222.100.282.400.090.8700.0110.0940.004
202323.300.292.400.090.9170.0110.0940.004
202524.700.302.400.090.9720.0120.0940.004
202626.200.312.400.091.0310.0120.0940.004
202827.700.322.400.091.0910.0130.0940.004
203029.700.342.400.091.1690.0130.0940.004
203131.200.352.400.091.2280.0140.0940.004
203333.200.362.400.091.3070.0140.0940.004
203535.200.382.400.091.3860.0150.0940.004
203737.200.392.400.091.4650.0150.0940.004
204039.200.402.400.091.5430.0160.0940.004
204242.200.422.400.091.6610.0170.0940.004
204544.700.442.400.091.7600.0170.0940.004
204747.200.462.400.091.8580.0180.0940.004
205049.700.482.400.091.9570.0190.0940.004
205352.600.502.400.092.0710.0200.0940.004
205655.600.522.400.092.1890.0200.0940.004
206059.600.552.400.092.3460.0220.0940.004
206362.600.572.400.092.4650.0220.0940.004
206766.600.602.400.092.6220.0230.0940.004
207170.600.622.400.092.7800.0250.0940.004

JASO F404 (Japan Automotive Standards Organisation)

3000 series (CS 3.50mm)

SizeID (mm)± (mm)CS (mm)± (mm)ID (in)± (in)CS (in)± (in)
302222.100.283.500.100.8700.0110.1380.004
302423.700.293.500.100.9330.0110.1380.004
302524.700.303.500.100.9720.0120.1380.004
302625.700.313.500.101.0120.0120.1380.004
302827.700.323.500.101.0910.0130.1380.004
303029.700.343.500.101.1690.0130.1380.004
303131.200.353.500.101.2280.0140.1380.004
303231.700.353.500.101.2480.0140.1380.004
303433.700.363.500.101.3270.0140.1380.004
303535.200.383.500.101.3860.0150.1380.004
303837.700.393.500.101.4840.0150.1380.004
303938.700.403.500.101.4840.0150.1380.004
304039.700.413.500.101.5630.0160.1380.004
304241.700.423.500.101.6420.0170.1380.004
304443.700.443.500.101.7200.0170.1380.004
304544.700.443.500.101.7600.0170.1380.004
304847.700.463.500.101.8780.0180.1380.004
305049.700.483.500.101.9570.0190.1380.004
305352.600.503.500.102.0710.0200.1380.004
305655.600.523.500.102.1890.0200.1380.004
306059.600.553.500.102.3460.0220.1380.004
306362.600.573.500.102.4650.0220.1380.004
306766.600.603.500.102.6220.0230.1380.004
307170.600.623.500.102.7800.0250.1380.004
307574.600.653.500.102.9370.0260.1380.004
308079.600.693.500.103.1340.0270.1380.004
308584.600.723.500.103.3310.0280.1380.004
309089.600.753.500.103.5280.0300.1380.004
309594.600.793.500.103.7240.0310.1380.004
310099.600.823.500.103.9210.0320.1380.004
3106105.600.863.500.104.1570.0340.1380.004
3112111.600.903.500.104.3940.0360.1380.004
3118117.600.943.500.104.6300.0370.1380.004
3125124.600.993.500.104.9060.0390.1380.004
3132131.601.043.500.105.1810.0410.1380.004
3140139.601.093.500.105.4960.0430.1380.004
3150149.601.163.500.105.8900.0460.1380.004

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