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The zinc plating provides additional protection against rust and corrosion
They have a Phillips drive and a hex washer head
The Phillips pan head provides a secure hold and prevents the screw from slipping out
The threads on the bolt help to draw the wood together and create a strong connection
which allows it to be easily driven with a screwdriver or drill
B7/8-9 x 2 1/2 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR NWCNP The zinc plating provides additionalB7 8 9 x 2 1 2 MS90728 is an alloy steel cap screw manufactured according to ASTM A354BD standards. It has a coarse thread pattern and is zinc plated for corrosion resistance. The "B" prefix indicates that the screw is black oxide coated. The "7 8 9" designation refers to the screw's nominal diameter and length in inches, while the "2 1 2" indicates the thread size. The MS90728 designation is a military specification number. The screw is made of B1821
