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 5 and comply with dimensional

5 and comply with dimensional standards

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

It is made of black plated and thus provide medium resistance to corrosion in both dry and wet environments

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 5 and comply with dimensionalWith 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.