B1/2-13 x 2 3/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR KWN and the 2/3 thread allows

and the 2/3 thread allows for easy penetration and withdrawal

5 x 50 Metric Socket Head Cap Screw Class 12

The 5/16-18 x 1 Coarse Thread Socket Set Screw Cup Plain is a cylindrical fastener with a hexagonal head and a threaded socket in the center

The 2-inch length and fully threaded shank provide a secure hold

B1/2-13 x 2 3/4 MS90728, Alloy Steel B1821 Coarse Cap Screw Per ASTM A354BD Zinc Yellow DFAR KWN and the 2/3 thread allowsB1 2 13 x 2 3 4 MS90728 is a coarse thread cap screw made of alloy steel B1821 and meets the specifications of ASTM A354BD. It has a diameter of 1 2 inch, a length of 2 3 4 inches, and a zinc yellow finish. The screw is designed for use in high strength applications and is compliant with the Defense Federal Acquisition Regulation Supplement (DFARS). It is commonly used in aerospace, automotive, and industrial settings.