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Hex Washer Head Tapcon Screws

Friday, May 31, 2013
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The standard hex headed Tapcon comes in diameters of 3/16” and 1/4”.  These designated diameters do not equal either the outside diameter or inside diameter but are approximately equal to the mean diameter. This allows for a simpler, easier to understand product description. The approximately measured diameters are as follows:

Designated DiameterInside DiameterOutside Diameter
3/16” .15625 .200
1/4” .1875 .245


The length of all hex head Tapcon screws are measured from underneath the head. They are measured this way because the hex head sits above the surface of the material being fastened and is not used to compute the length of screw required for any specific application.  A table showing the different lengths for each diameter is found below:

Diameter of Tapcon 3/16”Diameter of Tapcon 1/4”
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” 36-3/4”
4” 4”


Each tapcon is manufactured with only a portion of the shank threaded. The length of threads on each tapcon is 1-5/8”, with the exception of the 1-1/4” which has threads that are 1-1/8”. The thread length is designed to be equal to the maximum embedment in the base material. The threads are called double lead HI-Lo threads with 11 threads per inch on the 3/16” diameter and 15 threads per inch on the 1/4”.

Head Diameter

Measured from flat to flat on the hex head, the 3/16” diameter measures 1/4” and the 1/4” measures 5/16”. The diameter of the attached washer is .355” for the 3/16” diameter and .415” for the 1/4”.

Head Height

The height of the 3/16” diameter tapcons head is .140” and the 1/4” is .180”.

Driver Size

The size of the driver used for the hex washer headed Tapcon screw is equal to the diameter of the hex as measured from flat to flat.  The 3/16” diameter tapcon requires a 1/4” driver and the 1/4” tapcon requires a 5/16” driver.


The tapcon is manufactured out of a low carbon steel SAE1022.


All hex headed Tapcon concrete screws are coated with a special coating called Climaseal™ that is blue in color and helps prevent rusting.

Part Numbers Chart

The chart below allows easy cross-reference of part numbers to ensure that the exact match is made.

SizeBuildexConcrete Fastening Systems
  Part Number Part Number
3/16” x 1-1/4” 3139407 TCH316114
3/16” x 1-3/4” 3141407 TCH316134
3/16” x 2-1/4” 3143407 TCH16214
3/16” x 2-3/4” 3145407 TCH316234
3/16” x 3-1/4” 3147407 TCH36314
3/16” x 3-3/4” 3149407 TCH316334
3/16” x 4” 3151407 TCH3164
1/4" x 1-1/4” 3153407 TCH14114
1/4" x 1-3/4” 3155407 TCH14134
1/4" x 2-1/4” 3157407 TCH14214
1/4" x 2-3/4” 3159407 TCH14234
1/4" x 3-1/4” 3161407 TCH14314
1/4" x 3-3/4” 3163407 TCH14334

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Always use personal protective equipmentAs with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.

Article Written By:
Mike Pistorino, Vice-President Operations





Concrete Fastening Systems, Inc. has over 40 years of experience selling concrete fasteners. We can ship out one box or a whole pallet of concrete anchors. Our products are of the highest quality... "your satisfaction is guaranteed". We ship all orders the same day the order is received.

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