M16 Flat Penny Washer (Pack of 10) Large OD Plain Wide Round Metal Alloy Steel Washers for Screws – Zinc Coated Plated Galvanized Heavy Duty Certified Standart ISO7093 M16 (17mm x 50mm) :
Flat Washer Diameters
M16 x 50 x 3mm Penny Washers - A2 Stainless Steel
M5 - M24, Washers, Form B, Zinc, BZP, DIN 125 B, BS4320 – Fixaball Ltd. Fixings and Fasteners UK
What are the differences between different forms of washers?