Mechanical properties, corrosion behaviour and the full dimensional range for this grade.
A2 Stainless Steel Metric O-Rings (ISO 3601) are supplied to ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70. Corrosion behaviour is good general corrosion resistance, the material is largely non-magnetic, and the usable service range is approx. -200 °C to +400 °C, subject to the property class and the joint. In practice this grade is the most common stainless group for indoor and general outdoor fasteners.
Property values are typical for the grade. Certified mechanical test data is available on request for production orders.
A2 Stainless Steel is not a material metric o-rings (iso 3601) are supplied in. Metric O-Rings (ISO 3601) are specified by inside diameter, and this combination does not describe a part that exists.
The materials that do apply are: NBR (Nitrile), FKM (Viton®-type), EPDM, Silicone (VMQ), PTFE.
See the Metric O-Rings (ISO 3601) product page for the specifications that do apply →
Customize the parameters below — every spec field is editable, and the drawing redraws to match the values you choose. Changing the size will snap the other fields to that size's standard values; you can then override any individual value.
The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.
| Cross-section (mm) | Typical inside-diameter range (mm) | Common compounds | Notes |
|---|---|---|---|
| 1.0 | 1.0 u2013 20 | NBR, FKM, EPDM, silicone | miniature and pneumatic |
| 1.5 | 2.0 u2013 40 | NBR, FKM, EPDM, silicone | small pneumatic and instrument |
| 1.78 | 1.78 u2013 50 | NBR, FKM, EPDM | nearest metric equivalent to the 1/16 in section |
| 2.0 | 3.0 u2013 100 | NBR, FKM, EPDM, silicone | general hydraulic and pneumatic |
| 2.5 | 5.0 u2013 150 | NBR, FKM, EPDM | general hydraulic |
| 3.0 | 6.0 u2013 200 | NBR, FKM, EPDM | general hydraulic |
| 3.5 | 10 u2013 250 | NBR, FKM | hydraulic |
| 4.0 | 12 u2013 300 | NBR, FKM | hydraulic and larger flanges |
| 5.0 | 20 u2013 400 | NBR, FKM | large flanges and covers |
| 5.33 | 20 u2013 400 | NBR, FKM | nearest metric equivalent to the 3/16 in section |
| 6.0 | 25 u2013 500 | NBR, FKM | large covers and housings |
Where Metric O-Rings are used, and what decides the specification in each case. Stocked from 1.0 to 6.0 (inside diameter).
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail.
Head dimensions and under-head radius checked at set-up and per shift.
Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch.
Go / no-go ring gauges to ISO 965 tolerance class 6g.
Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it.
Core hardness and tensile tested per lot to ISO 898-1.
Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list.
Coating thickness and neutral salt spray hours to ISO 9227.
A2 Stainless Steel Metric O-Rings (ISO 3601) provide good general corrosion resistance with a service range of approx. -200 °C to +400 °C, subject to the property class and the joint.
For Metric O-Rings (ISO 3601), A2 Stainless Steel suits general indoor and outdoor use; A4 (316) is preferred for marine, coastal and chemical environments. Choose by corrosion exposure first.
Yes — stainless on stainless is prone to thread galling under load, especially at smaller sizes. Use an anti-galling lubricant or wax thread compound, and slow the tightening rate where possible.
A2 (304) is widely accepted for food contact in non-chloride environments; A4 (316) is preferred where chlorides are present.
Use the technical drawing on this page to pick the exact configuration, then submit it with the quote form. We respond within one business day.
