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Its 1/4-20 thread size and 2 1/2-inch length provide a secure hold in various materials
The black oxide and oil coating provides corrosion resistance and a smooth finish
It is also used to prevent the screw or bolt from loosening over time
while the finished hex shape allows for easy tightening and loosening
6-18 x 1 Phillips Round Washer Self Tapping Screw Type A Fully Threaded Zinc 05NCUP188 Its 1/4-20 thread size andThese 6 18 x 1 Phillips Round Washer Self Tapping Screw Type A Fully Threaded Zinc screws are designed for a variety of applications. They are made of zinc plated steel for corrosion resistance and have a Phillips drive for easy installation. The round washer head provides a large bearing surface for added strength. These screws are fully threaded for maximum holding power and are self tapping for easy installation in metal, wood, and plastic.
