Product Overview
TECHNICAL GUIDE – MECHANICAL ANCHORS ©2021 DEWALT – REV. E
A
NCHORS & FASTENERS
STRENGTH DESIGN (SD)
Mechanical anchors
18
FACTORED RESISTANCE STRENGTH (ØN
n
AND ØV
n
) CALCULATED IN ACCORDANCE WITH ACI 318-14 CHAPTER 17:
1- Tabular values are provided for illustration and are applicable for single anchors installed in normal-weight
concrete with minimum slab thickness, h
a
= h
min
, and with the following conditions:
- c
a1
is greater than or equal to the critical edge distance, c
ac
(table values based on c
a1
= c
ac
).
- c
a2
is greater than or equal to 1.5 times c
a1
.
2- Calculations were performed according to ACI 318-14, Chapter 17. The load level corresponding to the
controlling failure mode is listed. (e.g. For tension: steel, concrete breakout and pullout; For shear: steel, concrete
breakout and pryout). Furthermore, the capacities for concrete breakout strength in tension and pryout strength in
shear are calculated using the effective embedment values, h
ef
, for the selected anchors as noted in the design
information tables. Please also reference the installation specifications for more information.
3- Strength reduction factors (ø) were based on ACI 318-14 Section 5.3 for load combinations.
Condition B is assumed.
4- Tabular values are permitted for static loads only, seismic loading is not considered with these tables.
5- For designs that include combined tension and shear, the interaction of tension and shear loads must be
calculated in accordance with ACI 318-14, Chapter 17.
6- Interpolation is not permitted to be used with the tabular values. For intermediate base material compressive
strengths please see ACI 318-14, Chapter 17. For other design conditions including seismic considerations
please see ACI 318-14, Chapter 17.
Ca1
Ca2
ha
Tension and Shear Design Strength Installed in Cracked Concrete
Nominal
Anchor
Diameter
(in.)
Nominal
Embed.
Depth
h
nom
(in.)
Minimum Concrete Compressive Strength
f’c = 2,500 psi f’c = 3,000 psi f’c = 4,000 psi f’c = 6,000 psi f’c = 8,000 psi
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
1/4
1-5/8 495 780 525 855 575 980 645 980 705 980
2-1/2 920 1,225 970 1,225 1,060 1,225 1,195 1,225 1,305 1,225
3/8
2 845 915 930 1,000 1,070 1,155 1,315 1,415 1,515 1,635
2-1/2 1,280 1,375 1,400 1,510 1,620 1,740 1,980 2,080 2,290 2,080
3-1/4 2,040 2,200 2,235 2,410 2,580 2,605 3,165 2,605 3,650 2,605
1/2
2-1/2 1,070 1,270 1,170 1,395 1,355 1,610 1,655 1,970 1,915 2,275
3 1,635 1,900 1,790 2,085 2,070 2,405 2,535 2,945 2,925 3,400
4-1/4 3,055 4,325 3,345 4,735 3,865 5,470 4,735 6,695 5,465 6,705
5/8
3-1/4 1,850 1,995 2,030 2,185 2,345 2,525 2,870 3,090 3,315 3,570
4 2,700 4,155 2,960 4,550 3,415 5,255 4,185 6,435 4,830 7,385
5 3,980 6,040 4,360 6,615 5,035 7,640 6,165 9,350 7,120 9,350
3/4 4-1/4 2,985 6,135 3,270 6,720 3,780 7,760 4,625 9,505 5,340 10,975
■ - Anchor Pullout/Pryout Strength Controls ■ - Concrete Breakout Strength Controls ■ - Steel Strength Controls
Tension and Shear Design Strength Installed in Uncracked Concrete
Nominal
Anchor
Diameter
(in.)
Nominal
Embed.
Depth
h
nom
(in.)
Minimum Concrete Compressive Strength
f’c = 2,500 psi f’c = 3,000 psi f’c = 4,000 psi f’c = 6,000 psi f’c = 8,000 psi
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
f
N
n
Tension
(lbs.)
f
V
n
Shear
(lbs.)
1/4
1-5/8 1,155 980 1,265 980 1,460 980 1,785 980 2,065 980
2-1/2 2,110 1,225 2,310 1,225 2,665 1,225 2,950 1,225 2,950 1,225
3/8
2 1,495 1,610 1,640 1,765 1,890 2,035 2,315 2,080 2,675 2,080
2-1/2 1,805 1,945 1,980 2,080 2,285 2,080 2,795 2,080 3,230 2,080
3-1/4 2,880 2,605 3,155 2,605 3,645 2,605 4,465 2,605 5,155 2,605
1/2
2-1/2 2,255 1,780 2,475 1,950 2,855 2,255 3,495 2,760 4,040 3,185
3 2,495 2,685 2,730 2,940 3,155 3,395 3,865 4,160 4,460 4,805
4-1/4 4,530 6,050 4,960 6,630 5,725 6,705 7,015 6,705 8,100 6,705
5/8
3-1/4 3,270 3,520 3,580 3,855 4,135 4,455 5,065 5,455 5,845 6,295
4 3,810 5,815 4,175 6,370 4,820 7,355 5,905 7,385 6,820 7,385
5 5,620 8,455 6,155 9,265 7,110 9,350 8,705 9,350 10,050 9,350
3/4 4-1/4 4,745 8,590 5,195 9,410 6,000 10,865 7,350 11,555 8,485 11,555
■ - Anchor Pullout/Pryout Strength Controls ■ - Concrete Breakout Strength Controls ■ - Steel Strength Controls