Square Head Screw Fine & Full Thread Black-Oxide Alloy Steel 3/4-16 * 4" Grade 8 [Cup Point] [External Square Drive] Quantity:Unity these are designed for through-hole

these are designed for through-hole applications

This hexagonal bolt has a length of 6" with a threading of 1-3/8-6 [Partially Threaded]

This hexagonal bolt has a length of 5-1/2" with a threading of 1-8 [Partially Threaded]

but their holding power lessens with each use

The screw has a length of 2-1/4" and a thread of 1-8

Square Head Screw Fine & Full Thread Black-Oxide Alloy Steel 3/4-16 * 4" Grade 8 [Cup Point] [External Square Drive] Quantity:Unity these are designed for through-holeUse these set screws for light duty holding. A square head allows them to be turned by hand, or fastened with a wrench when you need more torque. The cup point has a thin edge that digs into the contact surface for a secure hold. Length is measured from under the head. The screw has a length of 4" and a thread of 3 4 16.