'O' Ring Guide

Chart 72: metric sizes
James Walker Chart 72 covers:
l BS 4518: Metric dimensions of toroidal sealing rings (O rings)
and their housings.
If the metric size you want is not available, please use the metric
columns in Chart 50 or Aerospace sizes to BS ISO 3601-1.
Chart 72 back-up rings cover sizes that include those in:
l BS 5106: Dimensions of spiral anti-extrusion back-up rings and
their housings.
Pneumatic & static plug housing details to BS 4518
For applications requiring back-up rings, use dynamic housing sizes
on pages 30-31.
Diameter section A
(mm)
Pneumatic
Radial
depth F
(mm)
Groove width
E (mm)
‘O’ ring only
Static plug
Radial
depth F
(mm)
2.4 2.13 / 2.20 3.1 / 3.3 1.84 / 1.97
3.0 2.70 / 2.77 3.7 / 3.9 2.35 / 2.50
4.1 3.73 / 3.82 5.0 / 5.2 3.30 / 3.45
5.7 5.22 / 5.38 6.4 / 6.6 4.70 / 4.95
8.4 7.75 / 7.96 9.0 / 9.2 7.20 / 7.50
For flange applications, the values of groove inside and outside
diameters (V and W — see Figure 11 on page 29) are shown on
Chart 72.
BS EN ISO 286-2 tolerances H11, h11 are given on page 31.
Housing details can be referred to on pages 29-31.
* Static/dynamic applications
An asterisk symbol (*) denotes that the ring is suitable for both
dynamic and static applications. Other sizes are not recommended
for dynamic duties.
All Chart 72 dimensions are in millimetres (mm).
A
‘O’ ring diameter section A and inside diameter B.
B
Refer to page 29 for List of Symbols
James
Diameters
Flange Groove Diameters
Walker Inside Cyl. Internal Pressure External Pressure
Number Dia. B C, T D V max W (H11) V (h11) W min
1.6 ±0.08mm Diameter Section A
72-0031-16 3.1 ±0.15 3.5 6 1.0 6.3 3.5 7.5
" 0041-16 4.1 " 4.5 7 2.3 7.3 4.5 8.5
" 0051-16 5.1 " 5.5 8 3.3 8.3 5.5 9.5
" 0061-16 6.1 " 6.5 9 4.3 9.3 6.5 10.5
" 0071-16 7.1 " 7.5 10 5.8 10.3 7.5 11.5
" 0081-16 8.1 " 8.5 11 6.8 11.3 8.5 12.5
" 0091-16 9.1 " 9.5 12 7.8 12.3 9.5 13.5
" 0101-16 10.1 ±0.20 10.5 13 8.8 13.3 10.5 14.5
" 0111-16 11.1 " 11.5 14 9.8 14.3 11.5 15.5
" 0121-16 12.1 " 12.5 15 10.8 15.3 12.5 16.5
" 0131-16 13.1 " 13.5 16 11.8 16.3 13.5 17.5
" 0141-16 14.1 " 14.5 17 12.8 17.3 14.5 18.5
" 0151-16 15.1 " 15.5 18 14.0 18.3 15.5 19.5
" 0161-16 16.1 " 16.5 19 15 19.3 16.5 20.5
" 0171-16 17.1 " 17.5 20 16 20.3 17.5 21.5
" 0181-16 18.1 ±0.25 18.5 21 17 21.3 18.5 22.5
" 0191-16 19.1 " 19.5 22 18 22.3 19.5 23.5
" 0221-16 22.1 " 22.5 25 21 25.3 22.5 26.5
" 0251-16 25.1 " 25.5 28 24 28.3 25.5 29.5
" 0271-16 27.1 " 27.5 30 26 30.3 27.5 31.5
" 0291-16 29.1 " 29.5 32 28 32.3 29.5 33.5
" 0321-16 32.1 ±0.30 32.5 35 31 35.3 32.5 36.5
" 0351-16 35.1 " 35.5 38 34 38.3 35.5 39.5
" 0371-16 37.1 " 37.5 40 36 40.3 37.5 41.5
2.4 ±0.08mm Diameter Section A
72-0036-24* 3.6 ±0.15 4 8 – 8.4 4 10
" 0046-24* 4.6 " 5 9 1.0 9.4 5 11
" 0056-24* 5.6 " 6 10 2.5 10.4 6 12
" 0066-24* 6.6 " 7 11 4.0 11.4 7 13
" 0076-24* 7.6 " 8 12 5.0 12.4 8 14
" 0086-24* 8.6 " 9 13 6.4 13.4 9 15
" 0096-24* 9.6 " 10 14 7.4 14.4 10 16
" 0106-24* 10.6 ±0.20 11 15 8.4 15.4 11 17
" 0116-24* 11.6 " 12 16 9.5 16.4 12 18
" 0126-24* 12.6 " 13 17 10.5 17.4 13 19
" 0136-24* 13.6 " 14 18 11.5 18.4 14 20
" 0146-24* 14.6 " 15 19 12.5 19.4 15 21
" 0156-24* 15.6 " 16 20 13.5 20.4 16 22
" 0166-24* 16.6 " 17 21 14.5 21.4 17 23
" 0176-24* 17.6 " 18 22 15.5 22.4 18 24
" 0186-24 18.6 ±0.25 19 23 16.5 23.4 19 25
" 0196-24 19.6 " 20 24 17.5 24.4 20 26
" 0206-24 20.6 " 21 25 18.5 25.4 21 27
" 0216-24 21.6 " 22 26 19.5 26.4 22 28
" 0246-24 24.6 " 25 29 22.5 29.4 25 31
" 0276-24 27.6 " 28 32 25.5 32.4 28 34
" 0296-24 29.6 " 30 34 27.5 34.4 30 36
" 0316-24 31.6 ±0.30 32 36 29.5 36.4 32 38
" 0346-24 34.6 " 35 39 32.5 39.4 35 41
" 0356-24 35.6 " 36 40 33.5 40.4 36 42
" 0376-24 37.6 " 38 42 35.5 42.4 38 44
" 0396-24 39.6 " 40 44 37.5 44.4 40 46
" 0416-24 41.6 " 42 46 39.5 46.4 42 48
" 0446-24 44.6 " 45 49 42.5 49.4 45 51
" 0456-24 45.6 " 46 50 43.5 50.4 46 52
" 0476-24 47.6 " 48 52 45.5 52.4 48 54
" 0496-24 49.6 " 50 54 47.5 54.4 50 56
" 0516-24 51.6 ±0.40 52 56 49.5 56.4 52 58
" 0546-24 54.6 " 55 59 52.5 59.4 55 61
" 0556-24 55.6 " 56 60 53.5 60.4 56 62
" 0576-24 57.6 " 58 62 55.5 62.4 58 64
" 0586-24 58.6 " 59 63 56.5 63.4 59 65
" 0596-24 59.6 " 60 64 57.5 64.4 60 66
" 0616-24 61.6 " 62 66 59.5 66.4 62 68
" 0626-24 62.6 " 63 67 60.5 67.4 63 69
" 0646-24 64.6 " 65 69 62.5 69.4 65 71
" 0676-24 67.6 " 68 72 65.5 72.4 68 74
" 0696-24 69.6 " 70 74 67.5 74.4 70 76
To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 21