M6 x 20mm Black Rubber Penny Washers (Pack of 10) size: 6.2mm Inside Diameter Outside 2mm Thickness

FLEXIBLE BLACK RUBBER – WATERTIGHT SEAL & VIBRATION DAMPENING IN ONE Manufactured from durable flexible black rubber that compresses on tightening to form a watertight seal around the bolt and substrate. Provides excellent vibration dampening, noise reduction, and shock absorption — preventing rattles, leaks, and mechanical wear at the fixing point. Naturally non-conductive, weather-resistant, and chemically stable across a wide temperature range. WIDE-FORM PENNY DESIGN – LARGE 20mm OUTER DIAMETER FOR LOAD SPREADING With a 6.2mm inner bore and 20mm outer diameter, this wide-form "penny" or "fender" rubber washer spreads bolt clamping force across a wide contact area. The oversized footprint protects soft materials like sheet metal, fibreglass, and plastic panels from being crushed or pulled through, while delivering excellent seal coverage around the drilled hole — essential for waterproof fixings on bodywork, panels, and roofing. M6 x 20mm – PACK OF 10 BLACK RUBBER PENNY WASHERS Each pack contains 10 individual M6 rubber washers with 6.2mm inner bore, 20mm outer diameter, and 2mm thickness. Suitable for automotive bodywork and chassis fixings, caravan and motorhome panel sealing, plumbing connections, sheet metal roofing, electrical enclosure isolation, garden machinery, marine fixings above waterline, and any project requiring a sealing, vibration-dampening washer. SEALS, DAMPENS & PROTECTS – THREE FUNCTIONS IN ONE WASHER Unlike metal washers that simply spread load, rubber washers deliver three benefits simultaneously: a watertight seal around the bolt hole, vibration absorption that prevents fasteners loosening over time, and surface protection that stops the bolt head crushing or scratching painted, plastic, or composite materials. The 2mm thickness compresses to roughly 1mm under typical tightening, creating consistent reliable sealing pressure. UNIVERSAL M6 FIT – COMPATIBLE WITH ALL STANDARD M6 BOLTS & SCREWS With a 6.2mm inner bore, these rubber penny washers are universally compatible with all M6 metric bolts, machine screws, coach bolts, threaded rod, and wood screws across all major brands. Pair with stainless steel or zinc-plated penny washers on top to combine waterproofing with mechanical load spreading — the classic "rubber-then-steel" stack used in roofing and bodywork. Available in M5 through M12 — browse our store for the complete rubber washer range.