M Barnwell Services Limited

Vast stocks and the shortest lead times in the industry makes M Barnwell Services the trusted supplier of Bonded Seals / Sealing Washers to thousands of engineers. Commonly known as Dowty Seals, M Barnwell Services Bonded Seals and Washers are reliable and dependable in high pressure applications. Particularly suitable for sealing under the heads of bolts and threaded components, for Pipe Couplings and a wide range of connector applications where a perfect face-to-face contact is required for sealing gases, oils, and other fluids. Our Bonded Seals (or Dowty Seals) consist of a rubber sealing element that is bonded to the inner wall of a metal washer. They are useful in applications where high pressures demand greater sealing capacity that can be obtained with Copper or traditional washers. Bonded seals are a preferred choice, especially in hydraulic systems, due to their durability and resilience in high-pressure applications. The outer ring of a Bonded seal forms the base and is usually made made of a hard metal material, such as steel. The inner-rings are usually rubber and are typically made from elastomers including: NBR, Viton™ or EPDM, depending on the requirements. The elastomer provides a necessary versatility and ability to perform under high-pressure conditions, forming a tight seal under pressure. Our Mild Steel / Stainless Steel range offers the highest burst pressure resistance offering tensile strength up to 540 MN/m2 (35 tons f/in2 UTS) minimum. For materials see our material properties page.

M Barnwell Services Hydraulic and Pneumatic seals are known for their longevity and durability and are used by many well-known OEMs in food, construction, pharmaceutical, plant, pneumatic and hydraulic applications. We offer seals in Metric and Imperial sizes. They are available in a variety of materials, including Rubberised Fabric, PTFE (including Virgin, Carbon, Bronze, Glass filled), Polyurethane (AU), Nitrile (NBR), Hydrogenated Nitrile (HNBR). As well as, Viton® (FKM/FPM), Fluorosilicone (FVMQ), Ethylene propylene (EPDM), Silicone (VMQ), Nylon®, Nylatron®, Acetal, Peek, and Leather. Hydraulic and Pneumatic Seals With over 8,000 Hydraulic and Pneumatic Seals in stock, we supply and manufacture to over 5000 customers globally every month. Popular products supplied include (Click for more information): Rod Seals – Also known as a Gland Seal / headbush / neck seals Piston Seals / Piston Rings / Cup Seals Cast Iron Piston Rings Wiper Seals Static Seals Guide Rings We can also provide you with bespoke Hydraulic and Pneumatic Seals and Custom Parts, specially engineered to suit your application. 24 Hour Hydraulic and Pneumatic Seal Maker Service We have a number of Seal Maker machines that can manufacturer standard, bespoke and prototype fluid seals within 24 hours or sooner. provide Visit the Seal Maker Service page for more information about the service. If you would like more information about our range, download our catalogue, visit the Seal Maker Page or contact a member of the team.

At M Barnwell Services, we take pride in offering a vast selection of oil products. Whether you require standard sizes or bespoke specifications, our inventory has you covered. Our offerings include: Manufacturer Oil Seal Designs: A Types (R21, SC, SM), AS Types (R23, TC, BASL), and B Types (R4, BB, B1). Cross Reference Guide: Explore our comprehensive Oil Seal manufacturer cross-reference guide for quick and easy identification. Styles: Rubber Covered, Metal Cased, and Totally Metal Enclosed. Materials: Choose from a variety, including Nitrile (NBR), Viton® (FKM/FPM), Silicone (VMQ), Leather, PTFE, Polyacrylic (ACM), and Neoprene (CR). Specialised Seals: Beyond standard seals, we offer a range of specialised options: Cassette Seals: Explore our Cassette Seals designed for enhanced protection. GACO Seals: Discover high-quality GACO Seals for superior performance. PTFE Shaft Seals: Explore the durability and reliability of our PTFE Shaft Seals. Premium Hub Oil Seals: M Barnwell Services proudly presents OE quality, premium hub oil seals from two leading manufacturers: Stemco – With 60 years of reliable service, Stemco offers a comprehensive selection of hub oil seals, hubodometers, and wheel-end products for buses, trucks, and trailers. Corteco – Corteco provides an unparalleled range of hub oil seals, ensuring precise fit, absolute reliability, and maximum life.

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. 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.