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M4, 4mm SCHNORR Brand Stainless Type "S" Regular Duty Disc Spring Lock Washer This safety disc washer is a reliable and economic bolt locking device. SCHNORR washers provide security through friction and mechanical locking. For Bolt Diameter: 4mm Inner Diameter: 4.3mm Outer Diameter: 7.0mm Height: 1.0mm Material Thickness: 0.5mm Material: A2 / 304 Stainless Steel A2 Stainless Steel is corrosion resistant under typical use where damp or wet conditions are present. Endless applications. Common applications include automotive, machine and plant engineering, photovoltaics, green energy, exposed environments. Qty 35 Pieces Per Package