M5 / 5mm METRIC WASHERS STANDARD FORM A THICK BRIGHT ZINC PLATED BZP DIN 125A
M5 - 5.3 x 10.0 x 1.0mm. Washers are Form A type (standard, thick, most common). These are the standard, most commonly used washers. Bright zinc plated. Zinc platted Form A Washer. M1.6 - 1.7 x 4.0 x 0.3mm.