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 Type F has machine screw threads, blunt point, tapered ending threads and Multiple Cutting Edges near the tip.
 Type 23 has machine screw threads and a large cut-out triangular area to allow for more clearance of materials.
 Type 1, similar to Type F, but has only One Cutting Edge.
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» Thread Cutting Screws Alloy
Floor Board Thread Cutting Screws
Typically used to secure wood decking on heavy equipment trailers, 1/4"-20 x 1 1/4" thru 5/6"-18 x 3 1/2".
Flat Head Phillips Thread Cutting Screws, Type F
Type F Thread, Zinc Plated Alloy, #6-32 x 3/8" through 1/4"-20 x 4"
Hex Washer Head, Unslot Thread Cutting Screws, Type 23
Type 23 Thread, Zinc Plated Alloy, #4-40 x 5/8" through 3/8"-16 x 2 1/2"
Hex Washer Head, Slotted Thread Cutting Screws, Type F
Type F Thread, Zinc Plated Alloy, #6-32 x 1/4" through 1/2"-13 x 1"
Pan Head Six-Lobe (Torx) Thread Cutting Screws, Type 1
Type 1 Thread, Zinc Plated Alloy, #8-32 x 1/2" through 5/16"-18 x 2"
Pan Head Six-Lobe (Torx) Thread Cutting Screws, Type 23
Type 23 Thread, Zinc Plated Alloy, #8-32 x 3/8" through 5/16"-18 x 2"
Pan Head Phillips Thread Cutting Screws, Type 23
Type 23 Thread, Zinc Plated Alloy, #10-24 x 1"