5/16-18 x 1 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc 20NCUP188 These high-quality nuts meet DIN

These high-quality nuts meet DIN 934 standards

while the deck screw design is optimized for use with decking materials

It has a slotted drive and a flat undercut head

It is made from durable steel and features a black zinc and bake finish for added corrosion resistance

They meet ASTM standards for quality and durability

5/16-18 x 1 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc 20NCUP188 These high-quality nuts meet DINThis 5 16 18 x 1 Serrated Hex Flanged Washer Full Thread Screw Case Hard Zinc is a high quality fastener designed for a variety of applications. The serrated hex flange washer head provides a secure grip and prevents the screw from loosening. The full thread design allows for maximum holding power. The case hardened zinc coating provides excellent corrosion resistance. This screw is perfect for use in automotive, construction, and other industrial