Product Overview
TECHNICAL GUIDE – MECHANICAL ANCHORS ©2021 DEWALT – REV. E
A
NCHORS & FASTENERS
REFERENCE DATA (ASD)
3
Mechanical anchors
Ultimate Load Capacities for Screw-Bolt+ in Normal-Weight Concrete
1,2
Nominal
Anchor
Diameter
in.
Minimum
Nominal
Embedment
Depth
in.
(mm)
Minimum Concrete Compressive Strength
f'c = 2,500 psi
(17.3 MPa)
f'c = 3,000 psi
(20.7 MPa)
f'c = 4,000 psi
(27.6 MPa)
f'c = 6,000 psi
(41.4 MPa)
f'c = 8,000 psi
(55.2 MPa)
Tension
lbs
(kN)
Shear
lbs
(kN)
Tension
lbs
(kN)
Shear
lbs
(kN)
Tension
lbs
(kN)
Shear
lbs
(kN)
Tension
lbs
(kN)
Shear
lbs
(kN)
Tension
lbs
(kN)
Shear
lbs
(kN)
1/4
1
(25)
1,325
(5.9)
1,660
(7.4)
1,400
(6.2)
1,755
(7.8)
1,530
(6.8)
1,910
(8.5)
1,725
(7.7)
2,080
(9.3)
1,725
(7.7)
2,080
(9.3)
1-5/8
(41)
2,835
(12.6)
1,660
(7.4)
2,995
(13.3)
1,755
(7.8)
3,265
(14.5)
1,910
(8.5)
3,265
(14.5)
2,080
(9.3)
3,265
(14.5)
2,080
(9.3)
2-1/2
(64)
3,650
(16.2)
2,025
(9.0)
3,855
(17.1)
2,140
(9.5)
4,200
(18.7)
2,335
(10.4)
4,270
(19.0)
2,545
(11.3)
4,270
(19.0)
2,545
(11.3)
3/8
1-1/2
(38)
2,630
(11.7)
3,550
(15.8)
2,880
(12.8)
3,890
(17.3)
3,330
(14.8)
4,490
(20.0)
4,075
(18.1)
5,500
(24.5)
4,075
(18.1)
6,355
(28.3)
2
(51)
3,670
(16.3)
4,320
(19.2)
4,020
(17.9)
4,735
(21.1)
4,645
(20.7)
5,465
(24.3)
4,725
(21.0)
6,345
(28.2)
5,455
(24.3)
6,345
(28.2)
3-1/4
(83)
7,420
(33.0)
6,325
(28.1)
8,130
(36.2)
6,930
(30.8)
9,065
(40.3)
8,000
(35.6)
9,065
(40.3)
8,565
(38.1)
10,350
(46.0)
8,565
(38.1)
4-1/2
(114)
10,905
(48.5)
6,325
(28.1)
11,945
(53.1)
6,930
(30.8)
13,795
(61.4)
8,000
(35.6)
15,075
(67.1)
8,565
(38.1)
15,075
(67.1)
8,565
(38.1)
1/2
1-3/4
(44)
2,840
(12.6)
5,985
(26.6)
3,115
(13.9)
6,555
(29.2)
3,595
(16.0)
7,570
(33.7)
4,400
(19.6)
9,270
(41.2)
4,400
(19.6)
10,705
(47.6)
2-1/2
(64)
6,680
(29.7)
8,035
(35.7)
7,320
(32.6)
8,800
(39.1)
8,450
(37.6)
10,160
(45.2)
8,450
(37.6)
11,545
(51.4)
8,450
(37.6)
11,545
(51.4)
4-1/4
(108)
13,260
(59.0)
9,395
(41.8)
14,525
(64.6)
10,290
(45.8)
16,480
(73.3)
11,885
(52.9)
16,480
(73.3)
13,520
(60.1)
16,480
(73.3)
13,520
(60.1)
5-1/2
(140)
15,730
(70.0)
9,395
(41.8)
17,235
(76.7)
10,290
(45.8)
19,900
(88.5)
11,885
(52.9)
21,310
(94.8)
13,520
(60.1)
21,310
(94.8)
13,520
(60.1)
5/8
2-1/2
(64)
5,735
(25.5)
10,615
(47.2)
6,285
(28.0)
11,630
(51.7)
7,255
(32.3)
13,425
(59.7)
8,885
(39.5)
16,445
(73.2)
8,885
(39.5)
17,170
(76.4)
3-1/4
(83)
9,755
(43.4)
12,065
(53.7)
10,685
(47.5)
13,220
(58.8)
12,340
(54.9)
15,265
(67.9)
12,340
(54.9)
17,170
(76.4)
12,340
(54.9)
17,170
(76.4)
5
(127)
14,455
(64.3)
13,675
(60.8)
15,830
(70.4)
14,980
(66.6)
18,280
(81.3)
17,295
(76.9)
19,295
(85.8)
19,485
(86.7)
22,280
(99.1)
19,485
(86.7)
6-1/4
(159)
20,520
(91.3)
13,675
(60.8)
22,475
(100.0)
14,980
(66.6)
25,955
(115.5)
17,295
(76.9)
31,785
(141.4)
19,485
(86.7)
31,785
(141.4)
19,485
(86.7)
3/4
2-1/2
(64)
6,035
(26.8)
11,615
(51.7)
6,610
(29.4)
12,725
(56.6)
7,635
(34.0)
14,690
(65.3)
9,350
(41.6)
17,995
(80.0)
9,350
(41.6)
20,775
(92.4)
4-1/4
(108)
11,900
(52.9)
17,055
(75.9)
13,035
(58.0)
18,685
(83.1)
15,050
(66.9)
21,575
(96.0)
17,745
(78.9)
24,270
(108.0)
20,490
(91.1)
24,270
(108.0)
5
(127)
19,020
(84.6)
17,055
(75.9)
20,835
(92.7)
18,685
(83.1)
24,055
(107.0)
21,575
(96.0)
29,460
(131.0)
24,270
(108.0)
29,460
(131.0)
24,270
(108.0)
6-1/4
(159)
20,495
(91.2)
17,055
(75.9)
22,450
(99.9)
18,685
(83.1)
25,920
(115.3)
21,575
(96.0)
31,750
(141.2)
24,270
(108.0)
31,750
(141.2)
24,270
(108.0)
1. Tabulated load values are for anchors installed in uncracked concrete with no edge or spacing considerations. Concrete compressive strength must be at the specified minimum at the
time of installation.
2. Ultimate load capacities must be reduced by a minimum safety factor of 4.0 or greater to determine allowable working load.