Low Head Socket Head Cap Screw Black Steel 1/2-13 * 2-1/2" Grade 8 [Cup Point] [Allen Drive] asme_b18-9 is the distance a nut

is the distance a nut or handle moves with one revolution of the lead screw

The rod has a length of 36" and a thread of 1-1/2-6

The screws have a thread of 5/8-11 and a length of 15

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

Low Head Socket Head Cap Screw Black Steel 1/2-13 * 2-1/2" Grade 8 [Cup Point] [Allen Drive] asme_b18-9 is the distance a nutMade of alloy steel, these low profile screws are nearly twice as strong as their stainless steel counterparts. With half the height of a standard socket head, these low profile screws fit in tight spaces, but are weaker than standard socket heads. Length is measured from under the head. Black oxide steel screws are mildly corrosion resistant in dry environments. Coarse threads are the industry standard: choose these screws if you dont know the pitch