ISO 3601-1 — Dimensions and tolerances
ISO 3601-1:2012 covers the inside diameter, the cross-section and their tolerances. The catalogue drawings apply class A (annex A).
Official ISO reference ↗ · The 2012 edition has a corrigendum and a 2019 amendment; check the edition required in the order.
ISO 3601-3 — Surface imperfections
ISO 3601-3:2005 and its amendment 1:2018 define acceptance criteria for surface imperfections. Limits depend on the type of imperfection, the cross-section and the grade selected.
| Grade | Use |
|---|---|
| N | General purpose |
| S | Special |
| CS | Critical service |
Dimensional class A does not determine the surface-quality grade. Catalogue O-rings are supplied to grade N per ISO 3601-3; grades S and CS are available on request.
Visual inspection may cover flash, parting-line offset, tears, flow marks, non-fills and inclusions. Numerical limits must come from the applicable standard and the specification.
Storage of unfitted parts
NF L 17-104 covers storage periods; NF L 17-103 covers packaging and storage conditions. The table below reproduces the values of the extract provided, whose notes a and b are not fully available.
| Group | Families in the list | Before delivery | Before fitting |
|---|---|---|---|
| II | NBR | 3 years | 8 years |
| III | CR, EPDM | 4 years | 10 years |
| IV | VMQ, FVMQ | 5 years (b) | 12 years (b) |
| V | FPM / FKM | 5 years (b) | 15 years (b) |
These periods are not cumulative. They are neither a service life after fitting nor a shelf-life guarantee for the delivered product. Confirm the notes, manufacturing date, storage conditions and contract requirements before use.
To specify in your request
Dimensions, material, quantity, fluid, temperature range, pressure, static or dynamic use, surface grade and required documents.
Prepare my request