SS Slotted CSK Machine Screw:M4 x 40mm - DIN 963/A2

This product is a metric machine screw featuring a slotted head with a countersunk profile, constructed from A2 stainless steel. It conforms to the DIN 963 standard, ensuring reliable dimensional accuracy for general engineering applications. The A2 stainless steel composition provides adequate corrosion resistance for indoor environments or areas with mild moisture exposure, distinguishing it from carbon steel alternatives that require plating. Buyers typically select this item for lightweight assemblies where the head must sit flush with the material surface. To choose the correct specification, verify that the M4 nominal diameter matches your fastening hole and that the 40mm nominal length provides sufficient engagement within the workpiece without protruding excessively.