U-Turn - 5/16-24 x 3/4" Button Head Socket Cap Screws 18-8 Stainless Steel, Allen Hex Drive
SPECIFICATIONS
Thread Pitch: 5/16-24 UNF
Length: 3/4" (0.75")
Allen Hex Socket Drive Size: 3/16" Hex
Head Diameter: .527" - .547"
Head Height: .152" - .166
Material: 18-8 Stainless Steel
A button head cap screw is a cap screw with a button head. Most button head cap screws have hex drives, making them button head socket cap screws.
The allen drive allows the screw to be turned with an allen wrench, meaning button head cap screws can be installed in tighter places than hex cap screws that must be installed with a hex socket or hex wrench.
The button head spreads the force of the screw over a wider bearing area than a socket head cap screw.