BS4518 Standard O-ring Sizes

Imperial O‑Ring Sizes & Tolerances (BS1806 & AS568A)
    
     

      
      
        Part No.
        Cross Section (CS) 1.6 ± 0.08mm
      

        Internal Diameter (ID)
        Tol ±
      
0031-163.10.15
0041-164.10.15
0051-165.10.15
0061-166.10.15
0071-167.10.15
0081-168.10.15
0091-169.10.15
0101-1610.10.20
0111-1611.10.20
0121-1612.10.20
0131-1613.10.20
0141-1614.10.20
0151-1615.10.20
0161-1616.10.20
0171-1617.10.20
0181-1618.10.25
0191-1619.10.25
0221-1622.10.25
0251-1625.10.25
0271-1627.10.25
0291-1629.10.25
0321-1632.10.30
0351-1635.10.30
0371-1637.10.30

        Part No.
        Cross Section (CS) 2.4 ± 0.08mm
      

        Internal Diameter (ID)
        Tol ±
      
0036-243.60.15
0046-244.60.15
0056-245.60.15
0066-246.60.15
0076-247.60.15
0086-248.60.15
0096-249.60.15
0106-2410.60.20
0116-2411.60.20
0126-2412.60.20
0136-2413.60.20
0146-2414.60.20
0156-2415.60.20
0166-2416.60.20
0176-2417.60.20
0186-2418.60.25
0196-2419.60.25
0216-2421.60.25
0246-2424.60.25
0276-2427.60.25
0296-2429.60.25
0316-2431.60.30
0346-2434.60.30

  

O-Ring Sizes Table
  
    
      Part No.
      Cross Section (CS) 2.4 ± 0.08mm
    

      Internal Diameter (ID)
      Tol ±
    
0376-2437.60.30
0396-2439.60.30
0416-2441.60.30
0446-2444.60.30
0516-2451.60.40
0546-2454.60.40
0576-2457.60.40
0596-2459.60.40
0616-2461.60.40
0646-2464.60.40
0676-2467.60.40
0696-2469.60.40

      Part No.
      Cross Section (CS) 3.0 ± 0.10mm
    

      Internal Diameter (ID)
      Tol ±
    
0195-3019.50.25
0215-3021.50.25
0225-3022.50.25
0245-3024.50.25
0255-3025.50.25
0265-3026.50.25
0275-3027.50.25
0295-3029.50.25
0315-3031.50.30
0325-3032.50.30
0345-3034.50.30
0355-3035.50.30
0365-3036.50.30
0375-3037.50.30
0395-3039.50.30
0415-3041.50.30
0425-3042.50.30
0445-3044.50.30
0495-3049.50.30
0545-3054.50.40
0595-3059.50.40
0645-3064.50.40
0695-3069.50.40
0745-3074.50.40
0795-3079.50.40
0845-3084.50.50
0895-3089.50.50
0945-3094.50.50
0995-3099.50.50
1045-30104.50.50
1095-30109.50.50
1145-30114.50.50
1195-30119.50.50
1245-30124.50.60
1295-30129.50.60

O-Ring Table

  
    Part No.
    Cross Section (CS) 3.0 ± 0.10mm
  

    Internal Diameter (ID)
    Tol ±
  
1345-30134.50.60
1395-30139.50.60
1445-30144.50.60
1495-30149.50.60
1545-30154.50.60
1595-30159.50.60
1645-30164.50.60
1695-30169.50.60
1745-30174.50.60
1795-30179.50.60
1845-30184.50.80
1895-30189.50.80
1945-30194.50.80
1995-30199.50.80
2095-30209.50.80
2195-30219.50.80
2295-30229.50.80
2395-30239.50.80
2495-30249.50.80

    Part No.
    Cross Section (CS) 5.7 ± 0.12mm
  

    Internal Diameter (ID)
    Tol ±
  
0443-5744.30.30
0453-5745.30.30
0493-5749.30.30
0523-5752.30.40
0543-5754.30.40
0593-5759.30.40
0623-5762.30.40
0643-5764.30.40
0693-5769.30.40
0743-5774.30.40
0793-5779.30.40
0843-5784.30.50
0893-5789.30.50
0943-5794.30.50
0993-5799.30.50
1043-57104.30.50
1093-57109.30.50
1143-57114.30.50
1193-57119.30.50
1243-57124.30.60
1293-57129.30.60
1343-57134.30.60
1393-57139.30.60
1443-57144.30.60
1493-57149.30.60
1543-57154.30.60
1593-57159.30.60
1643-57164.30.60

  
    Part No.
    Cross Section (CS) 5.7 ± 0.12mm
  

    Internal diameter (ID)
    Tol ±
  
1693-57169.30.60
1743-57174.30.60
1793-57179.30.80
1843-57184.30.80
1893-57189.30.80
1943-57194.30.80
1993-57199.30.80
2093-57209.30.80
2193-57219.30.80
2293-57229.30.80
2393-57239.30.80
2493-57249.30.80
2593-57259.31.00
2693-57269.31.00
2793-57279.31.00
2893-57289.31.00
2993-57299.31.00
3193-57319.31.50
3393-57339.31.50
3593-57359.31.50
3793-57379.31.50
3993-57399.31.50
4193-57419.32.00
4393-57439.32.00
4593-57459.32.00
4793-57479.32.00
4993-57499.32.00

    Part No.
    Cross Section (CS) 8.4 ± 0.15mm
  

    Internal diameter (ID)
    Tol ±
  
1441-84144.10.60
1491-84149.10.60
1541-84154.10.60
1591-84159.10.60
1641-84164.10.60
1741-84174.10.60
1791-84179.10.60
1841-84184.10.80
1891-84189.10.80
1941-84194.10.80
1991-84199.10.80
2041-84204.10.80
2091-84209.10.80
2191-84219.10.80
2291-84229.10.80
2341-84234.10.80
2391-84239.10.80
2491-84249.10.80

BS4518 Standard O-ring Sizes

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Location

Part No.	Cross Section (CS) 1.6 ± 0.08mm
Part No.	Internal Diameter (ID)	Tol ±
0031-16	3.1	0.15
0041-16	4.1	0.15
0051-16	5.1	0.15
0061-16	6.1	0.15
0071-16	7.1	0.15
0081-16	8.1	0.15
0091-16	9.1	0.15
0101-16	10.1	0.20
0111-16	11.1	0.20
0121-16	12.1	0.20
0131-16	13.1	0.20
0141-16	14.1	0.20
0151-16	15.1	0.20
0161-16	16.1	0.20
0171-16	17.1	0.20
0181-16	18.1	0.25
0191-16	19.1	0.25
0221-16	22.1	0.25
0251-16	25.1	0.25
0271-16	27.1	0.25
0291-16	29.1	0.25
0321-16	32.1	0.30
0351-16	35.1	0.30
0371-16	37.1	0.30
Part No.	Cross Section (CS) 2.4 ± 0.08mm
Part No.	Internal Diameter (ID)	Tol ±
0036-24	3.6	0.15
0046-24	4.6	0.15
0056-24	5.6	0.15
0066-24	6.6	0.15
0076-24	7.6	0.15
0086-24	8.6	0.15
0096-24	9.6	0.15
0106-24	10.6	0.20
0116-24	11.6	0.20
0126-24	12.6	0.20
0136-24	13.6	0.20
0146-24	14.6	0.20
0156-24	15.6	0.20

Part No.	Cross Section (CS) 2.4 ± 0.08mm
Part No.	Internal Diameter (ID)	Tol ±
0376-24	37.6	0.30
0396-24	39.6	0.30
0416-24	41.6	0.30
0446-24	44.6	0.30
0516-24	51.6	0.40
0546-24	54.6	0.40
0576-24	57.6	0.40
0596-24	59.6	0.40
0616-24	61.6	0.40
0646-24	64.6	0.40
0676-24	67.6	0.40
0696-24	69.6	0.40
Part No.	Cross Section (CS) 3.0 ± 0.10mm
Part No.	Internal Diameter (ID)	Tol ±
0195-30	19.5	0.25
0215-30	21.5	0.25
0225-30	22.5	0.25
0245-30	24.5	0.25
0255-30	25.5	0.25
0265-30	26.5	0.25
0275-30	27.5	0.25
0295-30	29.5	0.25
0315-30	31.5	0.30
0325-30	32.5	0.30
0345-30	34.5	0.30
0355-30	35.5	0.30
0365-30	36.5	0.30
0375-30	37.5	0.30
0395-30	39.5	0.30
0415-30	41.5	0.30
0425-30	42.5	0.30
0445-30	44.5	0.30
0495-30	49.5	0.30
0545-30	54.5	0.40
0595-30	59.5	0.40
0645-30	64.5	0.40
0695-30	69.5	0.40
0745-30	74.5	0.40
0795-30	79.5	0.40

Part No.	Cross Section (CS) 3.0 ± 0.10mm
Part No.	Internal Diameter (ID)	Tol ±
1345-30	134.5	0.60
1395-30	139.5	0.60
1445-30	144.5	0.60
1495-30	149.5	0.60
1545-30	154.5	0.60
1595-30	159.5	0.60
1645-30	164.5	0.60
1695-30	169.5	0.60
1745-30	174.5	0.60
1795-30	179.5	0.60
1845-30	184.5	0.80
1895-30	189.5	0.80
1945-30	194.5	0.80
1995-30	199.5	0.80
2095-30	209.5	0.80
2195-30	219.5	0.80
2295-30	229.5	0.80
2395-30	239.5	0.80
2495-30	249.5	0.80
Part No.	Cross Section (CS) 5.7 ± 0.12mm
Part No.	Internal Diameter (ID)	Tol ±
0443-57	44.3	0.30
0453-57	45.3	0.30
0493-57	49.3	0.30
0523-57	52.3	0.40
0543-57	54.3	0.40
0593-57	59.3	0.40
0623-57	62.3	0.40
0643-57	64.3	0.40
0693-57	69.3	0.40
0743-57	74.3	0.40
0793-57	79.3	0.40
0843-57	84.3	0.50
0893-57	89.3	0.50
0943-57	94.3	0.50
0993-57	99.3	0.50
1043-57	104.3	0.50
1093-57	109.3	0.50
1143-57	114.3	0.50

Part No.	Cross Section (CS) 5.7 ± 0.12mm
Part No.	Internal diameter (ID)	Tol ±
1693-57	169.3	0.60
1743-57	174.3	0.60
1793-57	179.3	0.80
1843-57	184.3	0.80
1893-57	189.3	0.80
1943-57	194.3	0.80
1993-57	199.3	0.80
2093-57	209.3	0.80
2193-57	219.3	0.80
2293-57	229.3	0.80
2393-57	239.3	0.80
2493-57	249.3	0.80
2593-57	259.3	1.00
2693-57	269.3	1.00
2793-57	279.3	1.00
2893-57	289.3	1.00
2993-57	299.3	1.00
3193-57	319.3	1.50
3393-57	339.3	1.50
3593-57	359.3	1.50
3793-57	379.3	1.50
3993-57	399.3	1.50
4193-57	419.3	2.00
4393-57	439.3	2.00
4593-57	459.3	2.00
4793-57	479.3	2.00
4993-57	499.3	2.00
Part No.	Cross Section (CS) 8.4 ± 0.15mm
Part No.	Internal diameter (ID)	Tol ±
1441-84	144.1	0.60
1491-84	149.1	0.60
1541-84	154.1	0.60
1591-84	159.1	0.60
1641-84	164.1	0.60
1741-84	174.1	0.60
1791-84	179.1	0.60
1841-84	184.1	0.80
1891-84	189.1	0.80
1941-84	194.1	0.80