Similar in design to an socket button head cap screw but with an 82 degree countersunk flat head. Part Number: 25C300FSHCSABOCoarse / Fine Threads: CoarseFinish: Black OxideLength Under Head: 3"Diameter / Pitch: 1/4"-20Finish: Alloy Steel Hex Cap Screws 316 Stainless Steel - 1/2-20 x 2-3/4 Partial Thread Black Oxide is not a protective finish and will rust if exposed to moisture. Recommended Hex Socket Allen Key Wrench: 5/32 Inch Shop socket head cap screws for high-strength fastening. Ideal for machinery, tooling, and industrial assembly applications Used when a flush mounting, high stregth screws is required. Commonly used in tools and dies where moving parts pass over fastened area. Flat Socket Cap Head Screws Socket Flat Countersunk Head Cap Screw, 1/4-20 X 1 1/2", Alloy Steel, Black Black Oxide Allen Bolts