--- title: "NBR (Nitrile) O-Ring Seal" description: "NBR (Nitrile) O-Ring Seal (acrylonitrile-butadiene rubber, typically 70 Shore A): good resistance to mineral oil, grease and hydraulic fluid; poor in ozone" url: https://engineeringhardware.com/guide/material/nbr-cad-svg-159-oring/ source: Engineering Hardware & Fasteners --- # NBR (Nitrile) O-Ring Seal Seals · ISO / DIN Temperature range, chemical and fluid compatibility, hardness and the full dimensional range for this compound. NBR (Nitrile) O-Ring Seal are supplied to acrylonitrile-butadiene rubber, typically 70 Shore A. Corrosion behaviour is good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering, the material is non-magnetic, and the usable service range is approx. -30 °C to +100 °C. In practice this grade is the default elastomer for oil and hydraulic sealing. - **Grade:** acrylonitrile-butadiene rubber, typically 70 Shore A - **Corrosion resistance:** Good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering - **Magnetic response:** Non-magnetic - **Service temperature:** approx. -30 °C to +100 °C Property values are typical for the grade. Certified mechanical test data is available on request for production orders. ![NBR (Nitrile) O-Ring Seal reference image](https://engineeringhardware.com/wp-content/uploads/2026/06/O-Ring-Seal-—-ISO-DIN-Series-159-—-ISO-DIN.webp) Material page for o-ring seal in NBR (Nitrile) (acrylonitrile-butadiene rubber, typically 70 Shore A). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering and the service range is approx. -30 °C to +100 °C. ## Why Choose NBR (Nitrile) for O-Ring Seal — ISO / DIN (Series 160) The default elastomer for oil and hydraulic sealing. For o-ring seal — iso / din (series 160), this matters when good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering is the primary requirement. ## Mechanical & Physical Properties | Grade designation | acrylonitrile-butadiene rubber, typically 70 Shore A | | --- | --- | | Magnetic response | Non-magnetic | | Service temperature | approx. -30 °C to +100 °C | | Corrosion characteristic | Good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering | ## Corrosion Behavior in Service Carbon and alloy steel o-ring seal — iso / din (series 160) require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use. ## Comparable Grades For o-ring seal — iso / din (series 160), consider FKM where temperature or chemical exposure is higher, or EPDM where the medium is water, steam or brake fluid rather than oil. Elastomer selection is decided by the medium, the temperature range and whether the seal is static or dynamic — not by strength. ## Sizes of O-Ring Seal — ISO / DIN (Series 160) Available in NBR (Nitrile) | 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 | Dimensions are independent of the material: every size above is available in NBR (Nitrile). Custom manufacturing · Made to drawing ## Need this seal in a grade that is not listed? Nbr is one of the grades the catalog describes. 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 | Product catalog ## 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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. Need help matching O-Ring Seal to your application? Send the assembly, the load and the environment with your enquiry and we will specify the size, material and finish against them. 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 ### How much compression should NBR (Nitrile) o-ring seal — iso / din (series 160) see? The groove or gland decides it, not the seal: a static radial seal is normally designed for roughly 15–30% compression on the section, and a dynamic one for less. Give us the groove dimensions and the pressure and we will confirm the section against them. ### What's the service temperature limit for NBR (Nitrile)? The practical service range is approx. -30 °C to +100 °C. ### Are NBR (Nitrile) O-Ring Seal — ISO / DIN (Series 160) magnetic? NBR (Nitrile) O-Ring Seal — ISO / DIN (Series 160) are non-magnetic. ### What corrosion resistance do NBR (Nitrile) O-Ring Seal — ISO / DIN (Series 160) offer? NBR (Nitrile) O-Ring Seal — ISO / DIN (Series 160) provide good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering with a service range of approx. -30 °C to +100 °C. ### 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. ## Related Pages [View the full O-Ring Seal — ISO / DIN (Series 160) page](https://engineeringhardware.com/fastener/cad-svg-160-oring/) ### More O-Ring Seal — ISO / DIN (Series 160) Guides