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Self Tapping Screws

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What are self tapping screws

A self tapping screw is a screw that creates threads in the material that it is being fastened, unlike its machine screw counterpart. Self tapping is not a reference the tip of the screw but how the threads are designed to mate with the materials being joined.

Diffrence between pointed self tapping & self drilling screws

Pointed self tapping screws
2d self tapping screw
Featuring a pointed tip that can penetrate and fasten a wide range of materials including, sheet metal, wood, plastic, and drywall. For thick guage materials, a pilot hole is generally required
Self drilling screws
2d self drilling screw
Some self tapping screws are also self drilling, providing a drill-like fluted tip that looks much like the tip of a center drill. Self Drilling Screws save on installation time and effort by drilling, tapping, and fastening materials in a single operation.

Sheet Metal Screw Size Conversion Chart

Screw Size Closest Fraction Decimal
#0 1/16" 0.060"
#1 5/64" 0.73"
#2 3/32" 0.086"
#3 7/64" 0.099"
#4 7/64" 0.112"
#5 1/8" 0.182"
#6 9/64" 0.138"
#7 5/32" 0.151"
#8 5/32" 0.164"
#9 11/64" 0.177"
#10 3/16" 0.190"
#12 7/32" 0.216"
#14 1/4" 0.242"

Sheet Metal Screw Pilot Hole Sizes

Screw Size Drill Size Hole Diameter
#2 No. 49 Drill Bit 0.720"
#4 No. 41 Drill Bit 0.960"
#6 No. 32 Drill Bit 0.116"
#8 No. 29 Drill Bit 0.138"
#10 No. 21 Drill Bit 0.159"
#12 No. 14 Drill Bit 0.182"
#14 No. 4 Drill Bit 0.211"

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