Product Overview
TECHNICAL GUIDE – MECHANICAL ANCHORS ©2021 DEWALT – REV. E
A
NCHORS & FASTENERS
REFERENCE DATA (ASD)
Mechanical anchors
4
Allowable Load Capacities for Screw-Bolt+ in Normal-Weight Concrete
1,2,3,4,5
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)
330
(1.5)
415
(1.8)
350
(1.6)
440
(2.0)
385
(1.7)
480
(2.1)
430
(1.9)
520
(2.3)
430
(1.9)
520
(2.3)
1-5/8
(41)
710
(3.2)
415
(1.8)
750
(3.3)
440
(2.0)
815
(3.6)
480
(2.1)
815
(3.6)
520
(2.3)
815
(3.6)
520
(2.3)
2-1/2
(64)
915
(4.1)
505
(2.2)
965
(4.3)
535
(2.4)
1,050
(4.7)
585
(2.6)
1,070
(4.8)
635
(2.8)
1,070
(4.8)
635
(2.8)
3/8
1-1/2
(38)
660
(2.9)
890
(4.0)
720
(3.2)
975
(4.3)
835
(3.7)
1,125
(5.0)
1,020
(4.5)
1,375
(6.1)
1,020
(4.5)
1,590
(7.1)
2
(51)
920
(4.1)
1,080
(4.8)
1,005
(4.5)
1,185
(5.3)
1,160
(5.2)
1,365
(6.1)
1,180
(5.2)
1,585
(7.1)
1,365
(6.1)
1,585
(7.1)
3-1/4
(83)
1,855
(8.3)
1,580
(7.0)
2,035
(9.1)
1,735
(7.7)
2,265
(10.1)
2,000
(8.9)
2,265
(10.1)
2,140
(9.5)
2,590
(11.5)
2,140
(9.5)
4-1/2
(114)
2,725
(12.1)
1,580
(7.0)
2,985
(13.3)
1,735
(7.7)
3,450
(15.3)
2,000
(8.9)
3,770
(16.8)
2,140
(9.5)
3,770
(16.8)
2,140
(9.5)
1/2
1-3/4
(44)
710
(3.2)
1,495
(6.7)
780
(3.5)
1,640
(7.3)
900
(4.0)
1,895
(8.4)
1,100
(4.9)
2,320
(10.3)
1,100
(4.9)
2,675
(11.9)
2-1/2
(64)
1,670
(7.4)
2,010
(8.9)
1,830
(8.1)
2,200
(9.8)
2,115
(9.4)
2,540
(11.3)
2,115
(9.4)
2,885
(12.8)
2,115
(9.4)
2,885
(12.8)
4-1/4
(108)
3,315
(14.7)
2,350
(10.5)
3,630
(16.1)
2,575
(11.5)
4,120
(18.3)
2,970
(13.2)
4,120
(18.3)
3,380
(15.0)
4,120
(18.3)
3,380
(15.0)
5-1/2
(140)
3,935
(17.5)
2,350
(10.5)
4,310
(19.2)
2,575
(11.5)
4,975
(22.1)
2,970
(13.2)
5,330
(23.7)
3,380
(15.0)
5,330
(23.7)
3,380
(15.0)
5/8
2-1/2
(64)
1,435
(6.4)
2,655
(11.8)
1,570
(7.0)
2,910
(12.9)
1,815
(8.1)
3,355
(14.9)
2,220
(9.9)
4,110
(18.3)
2,220
(9.9)
4,295
(19.1)
3-1/4
(83)
2,440
(10.9)
3,015
(13.4)
2,670
(11.9)
3,305
(14.7)
3,085
(13.7)
3,815
(17.0)
3,085
(13.7)
4,295
(19.1)
3,085
(13.7)
4,295
(19.1)
5
(127)
3,615
(16.1)
3,420
(15.2)
3,960
(17.6)
3,745
(16.7)
4,570
(20.3)
4,325
(19.2)
4,825
(21.5)
4,870
(21.7)
5,570
(24.8)
4,870
(21.7)
6-1/4
(159)
5,130
(22.8)
3,420
(15.2)
5,620
(25.0)
3,745
(16.7)
6,490
(28.9)
4,325
(19.2)
7,945
(35.3)
4,870
(21.7)
7,945
(35.3)
4,870
(21.7)
3/4
2-1/2
(64)
1,510
(6.7)
2,905
(12.9)
1,655
(7.4)
3,180
(14.1)
1,910
(8.5)
3,675
(16.3)
2,340
(10.4)
4,500
(20.0)
2,340
(10.4)
5,195
(23.1)
4-1/4
(108)
2,975
(13.2)
4,265
(19.0)
3,260
(14.5)
4,670
(20.8)
3,765
(16.7)
5,395
(24.0)
4,435
(19.7)
6,070
(27.0)
5,125
(22.8)
6,070
(27.0)
5
(127)
4,755
(21.2)
4,265
(19.0)
5,210
(23.2)
4,670
(20.8)
6,015
(26.8)
5,395
(24.0)
7,365
(32.8)
6,070
(27.0)
7,365
(32.8)
6,070
(27.0)
6-1/4
(159)
5,125
(22.8)
4,265
(19.0)
5,615
(25.0)
4,670
(20.8)
6,480
(28.8)
5,395
(24.0)
7,940
(35.3)
6,070
(27.0)
7,940
(35.3)
6,070
(27.0)
1. Tabulated load values are for anchors installed in uncracked concrete. Concrete compressive strength must be at the specified minimum at the time of installation.
2. Allowable load capacities are calculated using an applied safety factor of 4.0 to average ultimate load capacities.
3. Allowable load capacities must be multiplied by reduction factors when anchor spacing or edge distances are less than critical distances.
4. Linear interpolation may be used to determine allowable loads for intermediate embedments and compressive strengths.
5. For lightweight concrete multiply tabulated allowable load values by a reduction factor of 0.60.