--- title: "What Are O-Ring Seal Used For?" description: "O-Ring Seals (ISO / DIN) are used for containing fluid or excluding contamination at a static or dynamic interface. Catalogued 5 mm to 100 mm." url: https://engineeringhardware.com/applications/cad-svg-159-oring/ source: Engineering Hardware & Fasteners --- # What Are O-Ring Seal Used For? Seals · ISO / DIN · Application guide Typical applications, the industries that specify o-ring seal, and how to choose the right size, material and finish for the joint. O-Ring Seals are used for containing fluid or excluding contamination at a static or dynamic interface. They are manufactured to ISO / DIN, and selection is driven by the inside diameter, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Containing fluid or excluding contamination at a static or dynamic interface - **Governing standard:** ISO / DIN - **Inside diameter range:** 5 mm to 100 mm - **Category:** Seals Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are O-Ring Seal Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/06/O-Ring-Seal-—-ISO-DIN-Series-159-—-ISO-DIN.webp) O-Ring Seals (ISO / DIN) are specified where the joint requires containing fluid or excluding contamination at a static or dynamic interface. The sections below cover the typical end-uses by industry, the size and material decisions for each, assembly practice, and the applications this fastener type is not suited to. Stocked across roughly 5 mm to 100 mm, they cover general to heavy-duty work. ## Typical Applications for O-Ring Seal — ISO / DIN (Series 160) The most common settings where these are specified: - **General machine building:** fastening covers, brackets, motors and sub-assemblies on production equipment. - **Maintenance & repair (MRO):** a stocked size for servicing existing plant where the original fastener spec must be matched. - **Fabrication & metalwork:** bench and on-site assembly of steel frames, enclosures and weldments. 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This product spans 5 mm–100 mm; check the full table below for the exact dimensions of each size. - **Material:** Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance. - **Environment:** For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient. - **Standard:** This product is supplied to ISO / DIN. Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where O-Ring Seal — ISO / DIN (Series 160) Are Not the Right Choice Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure. Custom manufacturing · Made to drawing ## Need a o-ring seal outside the standard range? A special seal is almost always a compound change rather than a size change — the same dimensions in a material that survives the medium. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom seal manufacturing](https://engineeringhardware.com/custom/seals/)[Send a drawing](https://engineeringhardware.com/custom/seals/#rfq) ## Technical Drawing Dimensioned line drawing of 5 O-Ring Seal — ISO / DIN (Series 160). 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 ## Dimensions & Specifications (ISO / DIN) | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Wire dia (mm) | Material | Working temp range | Reference standard | | --- | --- | --- | --- | --- | --- | | 5 | 9 | 2 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 8 | 12 | 2 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 10 | 16 | 3 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 15 | 21 | 3 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 20 | 26 | 3 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 25 | 33 | 4 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 30 | 38 | 4 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 40 | 50 | 5 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 50 | 60 | 5 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 60 | 72 | 6 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 80 | 92 | 6 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | | 100 | 114 | 7 | NBR 70 | -30 to +110 C | ISO 3601 / GB/T 3452 | 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](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 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](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 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 ### What are O-Ring Seal — ISO / DIN (Series 160) used for? Containing fluid or excluding contamination at a static or dynamic interface. They are supplied to ISO / DIN. ### Which industries use O-Ring Seal — ISO / DIN (Series 160)? They are commonly specified in general machine building, maintenance & repair (mro) and fabrication & metalwork, among other sectors. ### How do I choose the right size of O-Ring Seal — ISO / DIN (Series 160)? Select on inside diameter and on the fit the assembly requires. This product is available from 5 mm to 100 mm; the full dimension table on this page lists each size. ### Are O-Ring Seal — ISO / DIN (Series 160) made to a recognized standard? Yes — they are manufactured to ISO / DIN, so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for O-Ring Seal — ISO / DIN (Series 160) in the size and material I need? Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time. ## Related Pages Product page: [O-Ring Seal — ISO / DIN (Series 160) — specifications & sizes](https://engineeringhardware.com/fastener/cad-svg-160-oring/) ### O-Ring Seal — ISO / DIN (Series 160) Specification Guides ### Related Fastener Applications