1/4-20 x 3/4 inch Black Zinc Button Head Socket Cap Screw. High-utility fastener designed for smooth, low-profile connections. In modular framing, this specific length is a staple for assembling light to medium duty 10 series fractional aluminum T-slot extrusion ( which uses 1 inch base and a 1/4 inch hardware channel).
 
Technical Specifications & Attributes
 
Thread Pitch: 1/4"-20 (1/4-inch major diameter with 20 threads per inch, standard Unified Coarse Thread/UNC).
 
Length: 3/4 inch (measured from directly underneath the low-profile head to the very tip of the screw).
 
Drive Style: 5/32" Hex / Allen Key socket drive
 
Head Profile: Button Head, which features a wider, rounded dome top and a completely flat underside. T
 
Finish Performance: Black Zinc plating provides basic indoor corrosion protection and chemical resistance. Structurally, it offers a matte/semi-gloss black finish that perfectly hides shiny hardware lines on black-anodized aluminum frames.