These are manufactured to DIN Standard 9021. Threaded Bar. Further details are as follows Imperial Flat & Spring Washers. Steel Fasteners. BSW Nuts,
M24 (24mm) Flat Washers (ISO 7089) - 18-8 / 304 Stainless Steel: Accu.co.uk: Washers & Spacers
Washers – Fixaball Ltd. Fixings and Fasteners UK
FORM G WASHERS Wide Thick Flat A4 Marine Grade Stainless Steel Din 9021 M2-M24 £0.99 - PicClick UK
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M4 - 4mm Shakeproof External Washers Locking Washer Stainless Steel A2 DIN 6798A
M3/M4/M5/M6/M8-M20 Din9021 Large Flat Washer 304 Stainless Steel Big Metal Gasket Meson Plain Washers
DIN9021 stainless steel large flat washer M2.5 M3 M3.5 M4 M5 M6 M8 M10 M12 M14 M16 Plain Gasket - AliExpress
10x Square Taper Washer 8 for U-sections DIN 434 Stainless Steel A4 M24 for sale online
M3-M20 ROUND SLEEVING Nut Thread Coupling Connector A2 Stainless Steel Allthread £1.74 - PicClick UK
M3 - M24 FORM G WASHERS A2 STAINLESS STEEL WIDE THICK FLAT DIN 9021 METRIC SIZES
Fastener + Fixing Magazine #75 by Fastener + Fixing Magazine - Issuu