Many sizes and four materials should cover your needs. Please contact us if you cannot find what you are looking for.
M12 Washers
Here are the sizes we have (inner x outer x height)
12.5mm × 18mm × 1.0mm 12.5mm × 18mm × 1.2mm 12.5mm × 18mm × 1.6mm 12.5mm × 20mm × 1.0mm 12.5mm × 20mm × 1.6mm 12.5mm × 20mm × 2.0mm 13.0mm × 21mm × 1.0mm 13.0mm × 21mm × 2.5mm (ISO Small) 12.5mm × 22mm × 1.6mm 12.5mm × 22mm × 2.3mm (JIS Small) 13.0mm × 24mm × 2.5mm (ISO) 12.5mm × 25mm × 3.2mm 12.5mm × 25mm × 4.5mm 12.5mm × 26mm × 1.0mm 12.5mm × 26mm × 1.6mm 12.5mm × 26mm × 2.0mm 12.5mm × 26mm × 2.3mm (JIS) 12.5mm × 28mm × 1.0mm 12.5mm × 28mm × 1.6mm 12.5mm × 28mm × 2.3mm 12.5mm × 28mm × 3.2mm 12.5mm × 30mm × 3.0mm 12.5mm × 30mm × 3.2mm 12.5mm × 32mm × 2.3mm 12.5mm × 32mm × 3.2mm 12.5mm × 32mm × 4.0mm 12.5mm × 32mm × 5.0mm 12.5mm × 34mm × 4.5mm 12.5mm × 40mm × 2.3mm 12.5mm × 40mm × 3.2mm