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), Kalrez®, Viton™ (or FKM/FPM), Viton™ A, Viton™ B, Viton™ GF, Viton™ GLT, Viton™ GFLT, Viton™ ETP, Ethylene 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.
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.
- ISO3601 (BS1806) Imperial Range
- Metric Range
- BS4518 Metric Range
- O Ring Quality Standards
- A Guide to O Ring Housings
- Housing Details For O Rings
- O Rings for Pipe Fittings (inch sizes only)
If you are technical and understand your requirements please use the RFQ Form.
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:
- High-Temperature Seals (310°C)
- Low-Temperature Seals (-46°C)
- Extreme Pressure / Cryogenic Seals
- AD / RGD Resistance Seals
- Sour Gas (H2S) Seals
- Hygienic Seals
- Specialist Custom Parts
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 Seals, Rotary Shaft Seals, Cartridge Seals, Hydraulic Seals, Hygienic (FDA) Seals, Specialist Hygienic Seals: Garlock’s Gylon Bio Line, Pneumatic Seals, Gaskets, Fasteners, Sealing Kits, Shaft Repair Kits, Special Rubber Mouldings, UK Manufactured Seals, D 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.
To find out more about our Easter Competition, click here.
No limitation to dimensions with over 10,000 different sizes available from stock
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
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).
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
Injection Moulded, Compression Moulded, Hot Vulcanised, Room Temperature Vulcanised (RTV), Butt / Scarf Joints, CNC Machined, Cleanroom Prepared
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™ is a trademark of The Chemours Company FC, LLC. M Barnwell Services does not manufacture Viton™ 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