0116 275 4720 sales@m-seals.co.uk


At M Seals we stock all ranges of o-rings including British Imperial (BS1806), British Metric (BS4518). European Metric (ISO/DIN 3601), including German (DIN 3771), Swedish (SMS 1586/1588) and French (NFT 47 501). American (SAE AS568A, MS 29 513) and Japanese Metric (JISB 2401).

Many of our o-rings are available with various approvals including Norsok M710, FDA, WRC, WRAS, UL, DVGW, KTW, BGVV, KIWA, USP, NSF/ANSI, EN549, EN681-1 and EN682.

All approvals can be provided with full certification.

Contact us on
0116 275 4720 or
with your o-ring requirements or challenges.
Our technical experts will be happy to help.


The following materials and advanced versions of them are available in a number of colours and shore hardness.

  • Nitrile (Buna-N)
  • Viton® (FPM, FKM)
  • Neoprene® (CR)
  • EPDM
  • Silicone (VMQ)
  • Kalrez®
  • High Nitrile
  • Aflas® (Tetrafluoroethylene Propylene, FEPM)
  • Fluorosilicone (FVMQ)
  • Polyurenthane
  • HNBR
  • SBR (Styrene-Butadiene)
  • Natural Rubber
  • Polyacrylate (ACM)
  • Butyl (IIR)
  • PTFE
  • Hypalon®
  • Vamac® (AEM ) – Ethylene Acrylic
  • Perfluoroelastomers
  • XNBR -Carboxylated Nitrile
  • ECO – Epichlorohydrin Rubber
  • PTFE Encapsulated

Many of the above are available with various approvals, including full certification Norsok M710, FDA, WRC, WRAS, UL, DVGW, KTW, BGVV, KIWA, USP, NSF/ANSI, EN549, EN681-1 & EN682.


M Seals has a goal which is to be recognised globally for quality, reliability and expertise in all aspects of our business. It is also our intent to provide the highest quality products to our customers while complying with customers’ contractual requirements, our company policies and procedures, and applicable safety, quality and environmental regulations. M Seals Leicester are approved to BSI ISO9001-2015 and Newcastle to BSI BS EN9120-2018.



Download our British Standard O-Ring Size Guide


Download our O-Ring Catalogue