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How to Install a Flat Head Concrete Screw

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Flat Head Tapcon Screws

The complete name of a flat-headed tapcon is a “flat Phillips countersunk tapcon." The flat-headed tapcon has a Phillips drive so that a Phillips type screwdriver can be used. The 3/16” flat-headed tapcon utilizes a #2-bit tip and the 1/4” requires a #3-bit tip.

Diameter of Flat Head Tapcons

The two diameters that are available in the flat-headed tapcon are 3/16” diameter and 1/4” diameter.

Length of Flat Head Tapcon Concrete Screws

The flat-headed tapcon length is measured as an overall length of the screw including the head. Flat-headed tapcons are manufactured in seven lengths for the 3/16” diameter: 1-1/4”, 1-3/4”, 2-1/4”, 2-3/4”, 3-1/4”, 3-3/4” and 4”. The 1/4” diameter is available in nine lengths: 1-1/4”, 1-3/4”, 2-1/4”, 2-3/4”, 3-1/4”, 3-3/4” and 4”, 5”, 6”.

Embedment Depth

Minimum embedment depth of a flat-headed tapcon is 1." Maximum embedment depth of a flat-headed tapcon is 1-3/4”.

Hole Diameter

The hole diameter that needs to be drilled into the base material is critical because the tolerance between the flat-headed tapcon diameter and hole size is critical. The hole must be drilled with a hammer-type drill and by using a carbide-tipped drill bit that meets ANSI standards. The 3/16” diameter hex head tapcon requires a 5/32” hole and the 1/4” diameter flat-headed tapcon requires a 3/16” hole.

Hole Depth

The depth of the hole in the base material needs to be a minimum of 1/4” deeper than the flat-headed tapcon will penetrate. This will ensure space for the dust that is created during the tapping process to fall out of the way, ensuring that the flat-headed tapcon will not bottom-out in the hole.

Hold Values for Flat-Headed Tapcon Screws

Diameter Minimum Embedment 2000 PSI Concrete 2000 PSI Concrete
3/16” 1” 600 lbs (tension) 720 lbs (shear)
1/4” 1” 1380 lbs 1200 lbs

Flat Head Tapcon Product Information

Each flat-headed tapcon comes packaged with one correct diameter and length bit per box.

Description Part Number Bit Length x Diameter Quantity Per Box
3/16” x 1-1/4 TCF316114 5/32” x 3-1/2” 100
3/16” x 1-3/4” TCF316134 5/32” x 3-1/2” 100
3/16” x 2-1/4” TCF316214 5/32” x 4-1/2” 100
3/16” x 2-3/4” TCF316234 5/32” x 4-1/2” 100
3/16” x 3-1/4” TCF316314 5/32” x 4-1/2” 100
3/16” x 3-3/4” TCF316334 5/32” x 5-1/2” 100
3/16” x 4” TCF3164 5/32” x 5-1/2” 100
1/4” x 1-1/4” TCF14114 3/16” x 3-1/2” 100
1/4” x 1-3/4” TCF14134 3/16” x 3-1/2” 100
1/4” x 2-1/4” TCF14214 3/16” x 4-1/2” 100
1/4” x 2-3/4” TCF14234 3/16” x 4-1/2” 100
1/4” x 3-1/4” TCF14314 3/16” x 4-1/2” 100
1/4” x 3-3/4” TCF14334 3/16” x 5-1/2” 100
1/4” x 4” TCF144 3/16” x 5-1/2” 100
1/4” x 5” TCF145 3/16” x 6-1/2” 100
1/4” x 6” TCF146 3/16” x 7-1/2” 100

Installing Flat Head Tapcon Screws

  • Drill a hole in the base material using a hammer drill and correct diameter bit for the flat-headed tapcon screw being installed.
  • Depth of hole should be drilled a minimum of 1/4” deeper than flat-headed tapcon would penetrate the base material.
  • Clean the hole of all dust by using a wire brush, vacuum or compressed air.
  • Insert flat-headed tapcon into the predrilled hole in the base material and turn clockwise until the head of tapcon is snug against the fixture.

Purchase Anchors

Feb 12th 2011 Mike Pistorino

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