'O' Ring Guide
'O' Ring Guide
'O' Ring Guide
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Header Non-standard sizes<br />
Methods of production<br />
Using one of the following techniques, we<br />
are able to produce any size of ‘O’ ring<br />
you require.<br />
Precision moulded<br />
For this, our main method of production,<br />
we hold a growing inventory of over 8,000<br />
mould tools. We also have one of the<br />
largest presses of its type in Europe for<br />
moulding endless rings up to 2.2m (87<br />
inch) diameter.<br />
This press is used to produce highintegrity<br />
seals, including those for nuclear<br />
fuel transportation flasks. The nature of<br />
such an application demands stringent<br />
quality procedures. James Walker design<br />
technologists worked closely with our<br />
customer with this successful project.<br />
Extruded & mould joined<br />
This approach is particularly economical<br />
when a high degree of precision is<br />
unnecessary: for example, large diameter<br />
non-standard ‘O’ rings for static duties.<br />
The ring is made from extruded cord<br />
by vulcanising the ends together in a<br />
mould tool. <strong>Ring</strong>s must have a minimum<br />
section diameter of 3mm (0.12 inch)<br />
and a minimum ID of 200mm (7.9 inch).<br />
Maximum ID is unlimited.<br />
NOTE: This method must not be confused<br />
with rings joined by contact adhesive.<br />
Generally, the use of such adhesives<br />
results in a less secure join, with operating<br />
temperature limits below that of the cord<br />
material.<br />
Mould & mould-joined<br />
This method is used when the nonstandard<br />
‘O’ ring must have a diameter<br />
section to very close tolerances and a<br />
mould-join is acceptable.<br />
It is often applied to sizes above 2.2m<br />
diameter, when two or more smaller rings<br />
are manufactured, then cut and mouldjoined.<br />
Tolerances for moulded<br />
‘O’ rings of non-standard sizes<br />
These tables show the tolerances on<br />
diameter section A and inside diameter B.<br />
They meet the requirements for nonstandard<br />
sizes in BS ISO 3601-1.<br />
A<br />
Tolerances on Diameter Section A<br />
Above<br />
Nominal section<br />
mm / inch<br />
Up to and including<br />
Limits<br />
mm / inch<br />
- 3.15 / 0.124 ± 0.08 / 0.003<br />
3.15 / 0.124 4.5 / 0.177 ± 0.10 / 0.004<br />
4.5 / 0.177 6 / 0.236 ± 0.12 / 0.005<br />
6 / 0.236 6.3 / 0.248 ± 0.13 / 0.005<br />
6.3 / 0.248 8.4 / 0.331 ± 0.15 / 0.006<br />
8.4 / 0.331 10 / 0.394 ± 0.21 / 0.008<br />
10 / 0.394 12.7 / 0.50 ± 0.25 / 0.010<br />
Tolerances on Inside Diameter B<br />
B<br />
Internal diameter<br />
mm / inch<br />
Limits<br />
mm / inch<br />
Above Up to and including Nominal<br />
- 3 / 0.118 ± 0.08 / 0.003<br />
3 / 0.118 18 / 0.709 ± 0.13 / 0.005<br />
18 / 0.709 22 / 0.866 ± 0.20 / 0.008<br />
22 / 0.866 30 / 1.181 ± 0.23 / 0.009<br />
30 / 1.181 50 / 1.969 ± 0.28 / 0.011<br />
50 / 1.969 80 / 3.150 ± 0.40 / 0.016<br />
80 / 3.150 120 / 4.724 ± 0.50 / 0.020<br />
120 / 4.724 180 / 7.087 ± 0.60 / 0.024<br />
180 / 7.087 250 / 9.843 ± 0.80 / 0.031<br />
250 / 9.843 300 / 11.81 ± 1.00 / 0.039<br />
300 / 11.81 400 / 15.75 ± 1.50 / 0.059<br />
400 / 15.75 500 / 19.69 ± 1.90 / 0.075<br />
500 / 19.69 720 / 28.35 ± 2.40 / 0.094<br />
720 / 28.35 860 / 33.86 ± 3.56 / 0.140<br />
860 / 33.86 1010 / 39.76 ± 4.06 / 0.160<br />
1010 / 39.76 1165 / 45.87 ± 4.57 / 0.180<br />
1165 / 45.87 1325 / 52.17 ± 5.08 / 0.200<br />
1325 / 52.17 1700 / 66.95 ± 6.00 / 0.236<br />
1700 / 66.95 - ± 7.00 / 0.276<br />
Note: For tolerances for<br />
extruded and mould-joined,<br />
and mould and mould-joined<br />
non-standard size <strong>'O'</strong> rings,<br />
please consult our Technical<br />
Support Team.<br />
24<br />
To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz
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