Large Diameter Tapcon® Concrete Screws Technical Information

Purchase Tapcon®
Concrete Screws

Ultimate Tension* and Shear Values in Concrete

    2000 PSI 3000 PSI 4000 PSI
Diameter (in.) Embedment Depth (in.) Tension (lbs.) Shear (lbs.) Tension (lbs.) Shear (lbs.) Tension (lbs.) Shear (lbs.)
3/8 1-1/2 1336 2108 1652 2764 1968 3416
  2 1492 3036 2024 3228 2552 3420
  2-1/2 3732 3312 3748 3364 3760 3424
  3 5396 3312 6624 368 7852 3428
1/2 2 3580 5644 3908 6512 4236 7380
  3-1/2 7252 6436 8044 7288 8836 8140
  4-1/2 10,176 7384 10,332 7968 10,488 8552
5/8 2-3/4 5276 8656 6560 11064 7844 13476
  3-1/2 7972 10224 9848 12144 11724 14060
  4-1/2 11568 12316 13432 13580 16892 14840
3/4 3-1/4 6876 7140 9756 10728 12636 14316
  4-1/2 10304 13120 14424 16868 18540 20612
  5-1/2 13048 17908 18156 21718 23268 25652

*Allowable values are based upon a 4 to 1 safety factor.

Recommended Edge & Spacing requirements for Tension Loads*
Carbon and Stainless Steel

Diameter (in.) Embedment 
Depth (in.)		 Edge Distance Measured to Obtain Max. Working Load (in.) Load Factor Applied at Min. Edge Distance 1-3/4" Inches Spacing Distance Required to Obtain Max. Working Load (in.) Load Factor Applied at Min. Spacing Distance 3" Inches
3/8" 1-1/2 2 70% 6 44%
  2 2 70% 6 44%
  2-1/2 3 70% 6 44%
  3-1/2 4 70% 6 44%
1/2 2 2-1/4 65% 8 27%
  2-1/2 3 65% 8 27%
  4-1/2 4 65% 8 27%

*Edge and spacing distance shall be divided by .75 when anchors are place in structural lightweight concrete.
Linear interpolation may be used for intermediate spacing and edge distances.

For 5/8" and 3/4" LDT anchors, the critical edge distance for these anchors is 10 times the anchor diameter.
The edge distance of these anchors may be reduced to 1-3/4" provided a 0.65 load factor is used for tension loads, a 0.15 load factor is used for shear loads applied perpendicular to the edge, or a 0.60 load factor is used for shear loads applied parellel to the edge. Linear interpolation may be usd for intermediate edge distances.

Recommended Edge & Spacing requirements for Shear Loads*
Carbon and Stainless Steel

Diameter (in.) Embedment 
Depth (in.)		 Edge Distance Measured to Obtain Max. Working Load (in.) Load Factor Applied at Min. Edge Distance 1-3/4" Inches Spacing Distance Required to Obtain Max. Working Load (in.) Load Factor Applied at Min. Spacing Distance 3" Inches
3/8" 1-1/2 3 25% 6 57%
  2 4 25% 6 57%
  2-1/2 5 25% 6 57%
  3-1/2 5 25% 6 57%
1/2 2 5 25% 8 60%
  2-1/2 5 25% 8 60%
  4-1/2 5-1/2 25% 8 60%

*Edge and spacing distance shall be divided by .75 when anchors are place in structural lightweight concrete.
Linear interpolation may be used for intermediate spacing and edge distances.

Ultimate Tension* Load in Concrete block
(anchors should be installed by hand in hollow block)

  Hollow
Concrete Block		 Grout Filled
Concrete Block
Anchor Diameter
(in.)		 Minimum Embedment
Depth (in)		 Tension
(lbs.)		 Shear
(lbs.)		 Tension
(lbs.)		 Shear
(lbs.)
3/8 1-1/2 916 3176 1595 3900
1/2 2-1/2 n/a n/a 5924 6680
Diameter Socket Size Washer Diameter LDT Diameter Hole Diameter Through Fixture
3/8" 9/16" 13/16" 3/8" 1/2"
1/2" 3/4" 1" 1/2" 5/8"
5/8" 15/16" 1-13/16" 5/8" 3/4"
3/4" 15/16" 1-3/16" 3/4" 7/8"

Length Identification Code

Code Length of Anchor
A 1-1/2" < 2"
B 2" < 2-1/2"
C 2-1/2" < 3"
D 3" < 3-1/2"
E 3-1/4" < 4"
F 4" < 4-1/2"
G 4-1/2" < 5"
H 5 < 5-1/2"


Product Specifications:

Diameter 3/8", 1/2", 5/8" and 3/4"
Head Style Hex Washer
Finish Zinc (5/8" and 3/4" available in Envirex coating)

Installation Steps in Concrete

  1. Using the proper size carbide bit drill hole at least 1" deeper than minimum embedment.
  2. Using an electric impact wrench or socket wrench- insert anchor.

Installation Steps in Concrete Block (CMU)

(3/8" and 1/2" diameters)

  1. Using the proper size carbide bit drill hole at least 1" deeper than minimum embedment of anchor being used.
  2. Using a socket wrench, insert anchor into hole and hand tighten anchor until fully seated.