Metric Socket Head Cap Screw Black-Oxide Alloy Steel Partial Thread M20 * 2.5 * 340MM, Grade 12.9 [Allen Key] Quantity:Bulk [20] they have a hex head

they have a hex head for a secure grip with a wrench

An irregularlyshaped thread at the top of the nut grips the bolt for a stronger hold than nylon-insert locknuts

The rod has a length of 36 and a thread of 1-3/8-6

The bolt usage limit is 4000 lbs

The screw has a length of 1-3/4" and a thread of 5/8-11

Metric Socket Head Cap Screw Black-Oxide Alloy Steel Partial Thread M20 * 2.5 * 340MM, Grade 12.9 [Allen Key] Quantity:Bulk [20] they have a hex headThis socket head cap screw is 340 mm long and has a M20 * 2. 5 mm thread [partially threaded]. Made of black oxide alloy steel, it offers slight corrosion resistance in dry conditions. The cup point and 12. 9 grade increase its compressive strength and provide a tensile strength and hardness of 170,000 psi Rockwell C39. In addition, it has a shear strength of 102,000 psi. ISO Metric Pitch Coarse threads are an industry standard. These screws are