Delivering Fluid Sealing Solutions Since 1972

O Rings

O Rings – The UK’s largest collection from stock

M Barnwell Services are the largest independent manufacturer, stockist and distributor of O Rings and Back-Up Rings in the UK. With 50 million in stock, we supply to over 5000 customers globally every month – quickly and reliably.

We have an extensive range of seal materials including Perfluoroelastomer (FFKM), Nitrile (NBR), Hydrogenated Nitrile (HNBR), Viton™ (or FKM/FPM)Viton™ A, Viton™ B, Viton™ GF, Viton™ GLT, Viton™ GFLT, Viton™ ETPEthylene Propylene (EPDM)Silicone (VMQ), Polytetrafluoroethylene (PTFE) Fluorosilicone (FVMQ) and Medical Grade. These can all be measured to imperial (BS1806, ISO 3601) and metric (BS4518) sizes, shore hardness and to a range of International, National and industry specifications, grades and approval standards.

We also offer a comprehensive range of quality FEP/PFA Encapsulated Rubber Seals, O Ring Cord and Hot Vulcanised Seals.

If you would like more information about our range, download our catalogue, or contact a member of the team.

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The high-quality range is competitively priced and if you are unsure on the material or size our expert team will help in all aspects of production, including prototyping, testing, and final part manufacture. Depending on the application M Barnwell Services and it’s manufacturing partners offer full batch traceability throughout the manufacturing process. Use the following links to view specific technical detail that may assist your fluid sealing selection.

If you are technical and understand your requirements please use the RFQ Form.

Standards

Fluid sealing standards are usually defined as documents that provide requirements, specifications, guidelines, or characteristics that can be used consistently to ensure that materials, products, processes, and services are fit for their purpose. The most commonly used O Ring standards include British Imperial (BS1806) and Metric (BS4518), European Metric (ISO 3601), including German (DIN 3771), Swedish (SMS 1586/1588) and French (NFT 47 501), American (SAE, AMS, AS568) and Japanese Metric (JISB 2401), SAE J515 and ISO8434-3 (SAE O ring boss hydraulic adaptors).

Grades, Approvals & Compliance

M Barnwell Services continually endeavours to meet the requires of the customer and their applications. In certain industries and applications it is essential that products and services meet specific industry criteria. Some of these approvals include WRC, WRAS, FDA, DVGW, KTW, BGVV, KIWA, USP Class VI, NSF, ACS, EU2002/72, EN681-1, EN549, 3A Sanitary, NORSOK, NACE TM0297, NACE TM0187, NORSOK M710, TOTAL GS PVV 142, ISO 23936-2, ISO 10423 API 6A, SHELL SPE 85/301, ISIR and EN682.

Visit the Approvals, Standards and Regulations page for a full breakdown of all relevant O Ring grades, and approvals.

Global Fluid Sealing Specialist Since 1972

As the UK’s leading supplier of O Rings, we recognize the complexity of specific applications and understand the language of engineering. As the experts we can also offer a range of other specialist products that include:

Visit the Industries Page for more information on relevant sealing products and gaskets by industry.

Visit the Products page for a full product listing. Other popular products include Oil Seals, Oil SealsRotary Shaft SealsCartridge SealsHydraulic SealsHygienic (FDA) SealsSpecialist Hygienic Seals: Garlock’s Gylon Bio LinePneumatic SealsGasketsFastenersSealing KitsShaft Repair KitsSpecial Rubber Mouldings, UK Manufactured SealsD Rings and many more.

You Are In Safe Hands

As a trusted supply partner to some of the world’s largest OEM manufacturing companies, M Barnwell Services are committed to providing quality products, whilst offering a first class, if not world class service.

With over £4 million sealing inventory and five strategically located branches throughout the UK, we are well placed to service your requirements and hope to exceed your expectations.

If you would like more information about our range, download our catalogue, visit the Seal Maker Page or contact a member of the team.

To find out more about our Easter Competition, click here.

Sizes

No limitation to dimensions with over 10,000 different sizes available from stock

Materials

Nitrile (NBR), Viton® (FKM/FPM), Ethylene propylene (EPDM), EnDura™ (Steam Resistant), Silicone (VMQ), Fluorosilicone (FVMQ), ), Viton® A, Viton® B, Viton® GF, Viton® GLT, Viton® GFLT, Viton® ETP

Perfluoroelastomers (FFKM) including: Perlast™, Perlast Ice™, Simriz™, Gplast®, Kalrez®, Chemraz®, and others

Polyurethane (AU), Hydrogenated Nitrile (HNBR), Aflas® (FEPM), Polytetrafluoroethylene (PTFE), Neoprene (CR), Encapsulated (FEP/PFA) Styrene Butadiene (SBR), Anti Explosive Decompression Compounds (AED), Viton Extreme®, Metal Detectable, X-Ray Detectable, & many more.

O-Ring shore hardness - range from 40 Shore to 90 Shore.

O-Ring colours - A range of different colours available, which subject to minimum production quantities

O-Ring installation - Coating to aid lubrication can also be supplied

Standards

British Imperial (BS1806) and Metric (BS4518). European Metric (ISO 3601), including German (DIN 3771), Swedish (SMS 1586/1588) and French (NFT 47 501). American (SAE, AMS, AS568) and Japanese Metric (JISB 2401), SAE J515 and ISO8434-3 (SAE O ring boss hydraulic adaptors).

Approvals

WRC, WRAS, FDA, DVGW, KTW, BGVV, KIWA, USP Class VI, NSF, ACS, EU2002/72, EN681-1, EN549, 3A Sanitary, NORSOK and EN682 and many more

Manufacturing Capabilities

Injection Moulded, Compression Moulded, Hot Vulcanised, Room Temperature Vulcanised (RTV), Butt / Scarf Joints, CNC Machined, Cleanroom Prepared

Kits

O-Ring Metric and Imperial Kits, Selection Boxes, Splicing Kits & Top-up Bags are available

Bespoke O Ring Kits and selection Boxes are also available

Viton™ Information

Viton™ is a trademark of The Chemours Company FC, LLC. M Barnwell Services does not manufacture Viton™ products

Associated Products

Encapsulated O-Rings (FEP/PFA), Lube, Gauge / O Ring material tester, Quad Rings® (X-Rings) / Nu-lip Rings, O-Ring Cord, Tube, Anti-extrusion Rings, Splicing Kits, Back-up Rings, Anti-extrusion Rings, Lubricants and Adhesives