5/16"-18 Star Drive Flat Head Type F Thread Cutting Floorboard Screws Black Phosphate & Oil Finish

5/16"-18 Star Drive Flat Head Thread Cutting Screws - Black Phosphate and Oil Finish - Type F Point

Diameter - Thread Pitch: 5/16"-18

5/16"-18 Thread Cutting screws feature a thread cutting tip which makes threads in existing or pre-drilled holes.

Drill Bit Sizes for Thread Cutting Screws

  • Provide a tight fit
  • High resistances to torque, shear, and tension when applied
  • Feature a machine screw style thread
  • Blunt tapered point with multi-cutting edges and chip cavities
  • Star drive style to designed to reduce the chance of slip out during proper installation
  • Minimizes the chance to stripping

Sizes Listed As:
Diameter - Thread Pitch x Length from Top of Head

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Product Specifications
Corrosion Resistant
Head Diameter
Max 0.597 - Min 0.556
C1022 Steel - Black Phosphate + Oil Finish
Point Type
Thread Diameter
(5/16") Max 0.3152 - Min 0.3065
Thread Pitch (Count)
18 Per Inch (Coarse)
Torx Drive
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