BBI Floorboard Thread Cutting Screw, Type F, Measurement System: Imperial, Six Lobe Drive, 1/4-20 Thread, 3 in Overall Length, Phosphate Coated, Flat Head, UNC Thread, HRC 45 min Surface/28-38 Core (After Tempering) Hardness

ITEM FEATURES:

• A thread cutting screw with machine screw thread with blunt tapered point, have multi-cutting edges and chip cavities
• For heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic