B1/4-28 x 1 3/4 MS90727, Alloy Steel B1821 Fine Cap Screw Per ASTM A354BD Zinc Yellow DFAR 4-22 while the 6-lobe truss head

while the 6-lobe truss head offers a low profile and prevents cam-out during installation

The indented hex washer head provides a secure grip for tightening and loosening

They are made of steel and are zinc plated for corrosion resistance

It meets the specifications of IFI-111 and is grade 8

B1/4-28 x 1 3/4 MS90727, Alloy Steel B1821 Fine Cap Screw Per ASTM A354BD Zinc Yellow DFAR 4-22 while the 6-lobe truss headB1 4 28 x 1 3 4 MS90727 is an Alloy Steel B1821 Fine Cap Screw that conforms to the specifications of ASTM A354BD. It has a diameter of 1 4 inch and a length of 1 3 4 inches. The screw is zinc plated yellow and meets the requirements of the Defense Federal Acquisition Regulation Supplement (DFARS). It is typically used in applications where high strength and corrosion resistance are required.