5mm x 40mm O Rings, Pack of 10 – A4 316 Marine Grade Stainless Steel Welded Polished Round Ring for Bag Making, Dog Collars, Webbing, Equestrian, Boat & DIY Craft

• A4 316 MARINE GRADE STAINLESS STEEL – CORROSION RESISTANT IN SALTWATER & OUTDOOR USE Manufactured from A4 316 stainless steel — the premium marine-grade alloy containing molybdenum for superior resistance to saltwater corrosion, rust, and pitting compared to standard 304 grade. Suitable for permanent marine, coastal, and outdoor applications including boat rigging, sailing gear, equestrian tack, and outdoor bag hardware where lesser materials would corrode within months.
• FULLY WELDED CONSTRUCTION – NO WEAK JOINT TO FAIL UNDER LOAD Each O ring is precision welded closed at the junction point and finish-polished smooth, eliminating the weak split or butt joint found on cheaper unwelded alternatives. The welded construction means the ring will not spring open, deform, or fail under sudden load — critical for safety-relevant applications including dog leads and collars, equestrian tack, lifting straps, sailing rigs, and any load-bearing strap connection.
• 5 x 40mm – PACK OF 10 STAINLESS STEEL O RINGS Each pack contains 10 individual O rings with 5mm wire thickness and 40mm internal diameter. Suitable for heavy equestrian tack, marine rigging, cargo strap connections, industrial webbing, lanyards, and DIY craft. The 40mm internal diameter accommodates standard 35–40mm webbing, leather strapping, and paracord. Free-running shape ideal where the strap needs to move smoothly around the ring.
• POLISHED MIRROR FINISH – CLEAN PROFESSIONAL APPEARANCE Highly polished mirror finish for a clean, professional look that resists staining and wipes clean easily. The smooth polished surface glides freely against fabric, leather, webbing, and nylon — preventing wear or fraying on the strap material it carries. Maintains its bright finish indefinitely with no plating to wear off, even after years of outdoor or marine use.
• VERSATILE – BAG MAKING, DOG COLLARS, EQUESTRIAN, MARINE & CRAFT Genuinely multi-purpose: a single pack covers bag and rucksack hardware, dog collar and lead attachment, harness fittings, leathercraft and saddlery, webbing strap connectors, equestrian bridles and tack, boat rigging and sailing hardware, lanyards, paracord projects, and decorative metalwork. Available across our full size range — browse our store for other wire thicknesses and internal diameters.

5mm Stainless Steel O Ring Welded Marine Grade Polished Finish 5mm x 40mm - (pack of 10) [→ ROUND RINGS KNOWN AS O RINGS ] These stainless steel round rings are finished in polished stainless steel, marine grade A4-AISI 316. Invisible welds and perfect for dog collars, horse bridles, webbing and diving gear. [→STAINLESS STEEL ROUND RINGS ] : superior strength and rust resistance with high precision polished for sleek appearance. . [→MARINE GRADE O RINGS ] : Good quality anti-rust durable round rings. Non-rusting stainless steel ring - versatile strap, binding and rigging hardware Perfect for marine, diving and outdoor harsh-condition applications; luggage & bags, saddles [→WELDED RINGS MADE OF STAINLESS STEEL ] : A4 grades of stainless steel are usually reserved for use in highly caustic environments where improved resistance to pitting corrosion is required, i.e Marine and exhausts. Pitting corrosion occurs once the chromium becomes exhausted through self-passivation after caustic attack - the effects as usually local to the exposed areas. The pitting forms as the Iron atoms become exposed to Oxygen and form 'rust'. [→STAINLESS STEEL MARINE GRADE RINGS ] : Rings are sized by ring thickness by inside diameter Wire range of sizes and quantity: 3 x 20mm, 3 x 30mm, 4 x 25mm, 4 x 30mm, 4 x 35mm, 5 x 30mm, 5 x 40mm