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Seals · ISO / DIN

ISO 3601 O-Ring Seal Specification

Dimensional table, tolerance classes and the DIN / ISO / ASME parts that supersede or match this standard.

ISO 3601 specifies the dimensions and tolerances for o-ring seal. The full dimensional table is reproduced below, followed by the DIN, ISO and ASME parts that match or supersede it.

Standard
ISO 3601
Product
O-Ring Seal — ISO / DIN (Series 159)
Governing standards
ISO / DIN

Equivalence between national standards is dimensional, not always metallurgical. Check the property class separately when substituting.

ISO 3601 O-Ring Seal Specification reference image

For o-ring seal, ISO 3601 is the governing document for the dimensions listed below. Mechanical and performance requirements for this part family are set by its own standards, not by the bolt and screw property-class documents.

ISO 3601 — Scope

The table below lists the dimensions catalogued for o-ring seal — iso / din (series 159) under ISO 3601. The scope of ISO 3601 itself is not summarised here — where a figure matters, confirm it against the published document.

Tolerance & Product Grades

Product grade is a concept from dimensional fastener standards and does not apply to ISO 3601. Tolerances for this part are the limits shown against each dimension in the table.

Dimensions Specified by ISO 3601

Inner diameter d1 (mm)Outer diameter d2 (mm)Wire dia (mm)MaterialWorking temp rangeReference standard
592NBR 70-30 to +110 CISO 3601 / GB/T 3452
8122NBR 70-30 to +110 CISO 3601 / GB/T 3452
10163NBR 70-30 to +110 CISO 3601 / GB/T 3452
15213NBR 70-30 to +110 CISO 3601 / GB/T 3452
20263NBR 70-30 to +110 CISO 3601 / GB/T 3452
25334NBR 70-30 to +110 CISO 3601 / GB/T 3452
30384NBR 70-30 to +110 CISO 3601 / GB/T 3452
40505NBR 70-30 to +110 CISO 3601 / GB/T 3452
50605NBR 70-30 to +110 CISO 3601 / GB/T 3452
60726NBR 70-30 to +110 CISO 3601 / GB/T 3452
80926NBR 70-30 to +110 CISO 3601 / GB/T 3452
1001147NBR 70-30 to +110 CISO 3601 / GB/T 3452

Equivalent Standards

Where direct equivalents exist (ISO ↔ DIN, ISO ↔ ASME), they are listed on the parent O-Ring Seal — ISO / DIN (Series 159) page.

Always confirm against the dimensions on this page, since some "equivalent" standards differ in tolerances and head geometry.

When to Specify ISO 3601

Choose ISO 3601 for international engineering work and OEM supply where ISO standards are the contractual reference. It is the default modern specification for o-ring seal — iso / din (series 159).

Custom manufacturing · Made to drawing

Need a seal to this standard in a non-standard size?

Parts built to ISO 3601 are already in the catalog, so a special is usually a variation on existing tooling rather than a new design — which is what keeps the cost down.

Minimum order from 2,000 pieces; samples within 7 days of drawing approval.

Custom seal manufacturingSend a drawing

Technical Drawing

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.

Dimensioned line drawing of 5 O-Ring Seal — ISO / DIN (Series 159). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected.
Outer diameter d2 (mm)
9
Wire dia (mm)
2
Material
NBR 70
Working temp range
-30 to +110 C
Sends the selected values to the quote form below.

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The form below follows the current technical drawing configuration. Change the drawing values above and the request details update automatically.

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Specification
Business Information

Dimensions & Specifications (ISO / DIN)

Inner diameter d1 (mm)Outer diameter d2 (mm)Wire dia (mm)MaterialWorking temp rangeReference standard
592NBR 70-30 to +110 CISO 3601 / GB/T 3452
8122NBR 70-30 to +110 CISO 3601 / GB/T 3452
10163NBR 70-30 to +110 CISO 3601 / GB/T 3452
15213NBR 70-30 to +110 CISO 3601 / GB/T 3452
20263NBR 70-30 to +110 CISO 3601 / GB/T 3452
25334NBR 70-30 to +110 CISO 3601 / GB/T 3452
30384NBR 70-30 to +110 CISO 3601 / GB/T 3452
40505NBR 70-30 to +110 CISO 3601 / GB/T 3452
50605NBR 70-30 to +110 CISO 3601 / GB/T 3452
60726NBR 70-30 to +110 CISO 3601 / GB/T 3452
80926NBR 70-30 to +110 CISO 3601 / GB/T 3452
1001147NBR 70-30 to +110 CISO 3601 / GB/T 3452

Applications & Industries

O-Ring Seal are bought for a small number of well-defined jobs. These are the ones we ship them for. Stocked from 5 to 100 (inside diameter).

Industries that specify O-Ring Seal

  • Process & food equipment Sealing at joints that are cleaned and inspected.
  • Hydraulics & pneumatics Static and dynamic sealing in cylinders and valve bodies.

Typical applications

  • excluding dust and moisture from a housing
  • sealing a joint against fluid or air pressure

Service conditions to specify against

Sealed joints
Used where the fixing has to keep water or air out as well as hold — the elastomer, not the fastener, decides service life.

Full application guide: where O-Ring Seal are used, how to specify them, and the cases they are wrong for

Video: ISO 3601 O-Ring Seal Specification

Video: ISO 3601 O-Ring Seal Specification

Third-party video, selected automatically for this topic. It is not produced by Engineering Hardware and is not a specification source — use the tables on this page for dimensional data.

Inside the plant

Manufactured in our own plant

This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.

  1. Wire rod feeding into a cold heading machine
    01

    Cold heading

    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.

  2. Thread rolling machine producing bolt threads
    02

    Thread rolling

    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.

  3. Baskets of bolts staged for heat treatment
    03

    Heat treatment

    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.

  4. Zinc plated bolts in a treatment basket
    04

    Surface treatment

    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.

Frequently Asked Questions

Can I substitute ISO 3601 for the corresponding DIN standard on a drawing?

On modern drawings the ISO standard is the master reference; the older DIN equivalent is a cross-reference. For most dimensional purposes the parts are interchangeable, but check tolerance grades and the head height — these are the most common points of divergence.

Which edition of ISO 3601 does this table follow?

The table reproduces the dimensions we supply o-ring seal — iso / din (series 159) to. We do not publish an edition year against it, so where the edition is contractually significant, cite the edition you require on the enquiry and we will confirm it against the table before quoting.

How do I request a quotation?

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.