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Flat Head Phillips Tapcon Screws

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Flathead Phillips Tapcon screws come in two designated diameters of 3/16” and 1/4”.  The designated diameter is roughly equal to the mean diameter measurement of the screw.  The outside and inside diameters are approximated as follows:

Size Inside Diameter Outside Diameter
3/16” DIAMETER .15625 .200
1/4” DIAMETER .18750 .245


The length of the flat-headed Tapcon is measured as an overall length including the head. The length of screw is determined by adding the thickness of the material being fastened to the required embedment depth.  Since the top surface of the head of the Tapcon screw is countersunk and flush with the surface of the material being fastened, the head is included in the overall length measurement.

Thread Length

Both diameters of Tapcon screws have the same thread length for each length of the screw.  The 1-1/4” length has a thread length of 1-1/8” and all other sizes have 1-5/8”.  The 1-5/8” thread length ensures that all threads will engage the base material up to the maximum embedment depth of 1-3/4”.

3/16” Diameter 1/4” Diameter
1-1/4” 1-1/4”
1-3/4” 1-3/4”
2-1/4” 2-1/4”
2-3/4” 2-3/4”
3-1/4” 3-1/4”
3-3/4” 3-3/4”
4” 4”

Type of Thread

The threads on the flat head Phillips Tapcon masonry screw are double lead Hi-Lo and have 11 threads per inch for the 3/16” diameter and 15 threads per inch for the 1/4” diameter.

Head Mark

Each screw head is marked with a specific designation to allow embedment depth of the Tapcon screw to be determined once the screw is installed. To determine embedment depth, subtract the overall length of the screw from the thickness of the material being fastened.  The head of each Tapcon brand screw also has a BX stamped on the head designating it as the original American-made Buildex Tapcon brand masonry screw fastener.

Length of Screw Head Mark
1-1/4” ?
1-3/4” A
2-1/4” B
2-3/4” C
3-1/4” D
3-3/4” E
4” F
5” H
6” J

Diameter of Head

The diameter of the head measures .365 on the 3/16” diameter and .471 on the 1/4” diameter, as measured across the flat of the head at the widest point.


The angle of the countersunk head measures 80 degrees for both the 3/16” and 1/4” diameters.

Size of Driver

The 3/16” diameter Tapcon requires the use of a #2 Phillips driver, and the 1/4” diameter requires the use of a #3 Phillips driver.


Each Buildex Tapcon brand screw is manufactured from S.A.E. 1022 carbon steel and coated with a Climaseal™ coating for rust resistance.

Part Number

Diameter and Length Buildex Concrete Fastening Systems
3/16” - #2 Phillips Flat Head    
1-1/4” 3169407 TCF316114
1-3/4” 3171407 TCF316134
2-1/4” 3173407 TCF316214
2-3/4” 3175407 TCF316234
3-1/4” 3177407 TCF36314
3-3/4” 3179407 TCF316334
4” 3181407 TCF3164
1/4” - #3 Phillips Flat Head    
1-1/4” 3183407 TCF14114
1-3/4” 3185407 TCF14134
2-1/4” 3187407 TCF14214
2-3/4” 3189407 TCF14234
3-1/4” 3191407 TCF14314
3-3/4” 3193407 TCF14334
4” 3195470 TCF144
5” 3197407 TCF145
6” 3203407 TCF146

Flat Head Tapcon Information

Blue Flat Head Tapcon Concrete Screw

Purchase Tapcons

Jun 1st 2013 Bob Carlisle

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