O-rings, in the two standards your machines actually use.
Metric for European equipment, inch for anything American or older. Both come from the same mould range, so the answer to “can you get this size” does not depend on which standard you quote.
01 · Metric
Metric O-rings
DIN 3771 and ISO 3601, the standard range used across European hydraulic and pneumatic equipment. If your drawing gives a millimetre dimension with no standard reference, it is almost certainly this series.
| Inside diameter | Quoted range 3 – 500 mm; wider moulds available on request |
| Cross section | 1.0 / 1.5 / 1.78 / 2.0 / 2.5 / 2.62 / 3.0 / 3.53 / 3.55 / 4.0 / 5.33 / 6.99 mm |
| Material | NBR 70 as standard; FKM 70 and A90 on request |
| Typical use | Threaded connections, flange joints, end caps, pump covers |
| Packing | Bags of 100 / 500 / 1000, labelled with size, material and batch |
02 · Inch
AS568 & BS1806
The American series, in the five cross sections that cover almost everything: -0xx at 1.78 mm, -1xx at 2.62 mm, -2xx at 3.53 mm, -3xx at 5.33 mm, -4xx at 6.99 mm. BS1806 uses the same dimensions, so one enquiry answers both.
| How to order | Send the number — AS568-214, BS1806-214, or the dash number on its own |
| Coverage | -001 to -4xx series, subject to mould availability |
| Material | NBR 70 as standard; FKM on request |
| Useful to know | An AS568 dash number is a metric dimension in disguise — -214 is 31.50 mm ID × 3.53 mm CS |
Production trays at our partner mould shop, Shenzhen. We do not hold this stock ourselves — we draw from it against your order.
03 · Kits
O-ring kits
For the van, the workshop shelf, or the counter. A compartmented box with a printed size index, so a fitter can find a ring without opening a catalogue.
| Format | 15 to 30 compartments, clear lid, printed index card |
| Contents | Metric assortment as standard; a size list of your own on request |
| Material | NBR 70 standard. FKM kits available but rarely worth the cost for general workshop use |
| Minimum | Confirmed per kit configuration in the quotation |
Also available
Other sealing products, against your part number.
Oil seals, hydraulic seals, back-up rings and cut gaskets are supplied to order but are not listed here, because we would rather answer accurately than advertise a range we have not verified. Send the number or the drawing and we will tell you what is possible.
Not sure which standard you have?
Send a photograph of the ring next to a ruler, or the machine make and model. Identifying the series is part of the job.
Send an enquiry