1/4-20x2 1/2 six lobe flat floor board screw type f black phosphate. Thread-cutting type-f threaded screws are used in heavy gauge sheet metal, aluminum, zinc and lead die castings, cast iron, brass and plastic. In stainless steel, material into which the screw is to cut threads should have a lower hardness by 10-20 rockwell hardness.
- Flat head screws are used when protrusion of the fastener above the mating surface is unacceptable
- Typically 100 degree flat or for fastening softer materials, 82 degrees flat.
- Package qty 750
- Drive 6 lobe
- Finish Black phosphate
- Length inches 2 1/2
- Manufacturers part number 1440ftfbt27
- Head Flat
- Size 1/4-20
- Country of origin Import
