Socket Head Cap Screw Fine Thread Black Steel 1-3/8-12 * 4-1/2" Grade 8 [Cup Point] [Allen Drive] thread_size_9-16-18 It is made of 316

It is made of 316 stainless steel

The screws have a thread of 1-1/4-7 and a length of 7

They're angled under the head to sit flush within countersunk holes

The shackles have a diameter of 1-1/4

The screw has a length of 4-1/2" and a thread of 1-3/4-5

Socket Head Cap Screw Fine Thread Black Steel 1-3/8-12 * 4-1/2" Grade 8 [Cup Point] [Allen Drive] thread_size_9-16-18 It is made of 316With a tensile strength of 170,000 psi, these Alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head. The screw has a length of 4 1 2 and a thread of 1 3 8 12. Alloy steel screws are mildly corrosion resistant in dry environments. Fine and extra fine threads are closely spaced to prevent loosening from vibration: the finer the thread, the better the resistance. They are not compatible with coarse threads.