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POWER-Skru Bolt Anchors
Additional Information
POWER-Skru Tech Data
Industry Technical Manual
2014 Order Guide

Ultimate and Allowable Load (lbs)

Anchor Dia.

Drill Bit Dia.

Nominal
Embed.

Allowable Load Data

Ultimate Load Data

3000 psi concrete

6000 psi concrete

3000 psi concrete

6000 psi concrete

in.

in.

in.

Tension

Shear

Tension

Shear

Tension

Shear

Tension

Shear

1/4

1/4

1-3/16

190

427

256

671

760

1708

1025

2684

2-1/2

601

442

863

712

2404

1768

3452

2848

3/8

3/8

2

919

890

1062

2060

3676

3560

4248

8240

3-1/2

2086

2048

2788

3007

8344

8192

11152

12028

1/2

1/2

2

853

1088

1190

2267

3412

4352

4760

9068

3-1/2

2190

2235

3007

3667

8760

8940

12028

14668

5/8

5/8

2-1/2

873

1191

1172

3162

3492

4764

4688

12648

3-1/2

2324

2389

3341

5915

9296

9556

13364

23660

3/4

3/4

2-1/2

1078

1569

1761

3536

4312

6276

7044

14144

5-3/4

3290

3959

6752

7933

13160

15836

27008

31732

Note: The data presented in this table is based on independent laboratory testing at critical anchor spacing and edge distance.

*Tested in accordance with ASTM E488

Load Adjustment Factors - Spacing*

Anchor Diameter

1/4

3/8

1/2

5/8

3/4

Embedment

hnom

1-3/16

2-1/2

2

3-1/2

2

3-1/2

2

3-1/2

2-1/2

4

Critical

Spacing

Scr

3

3

6

6

8

8

10

10

12

12

Minimum

Spacing

Smin

1

1

1-1/2

1-1/2

2

2

2-1/2

2-1/2

3

3

Actual

Spacing

Sact

1-1/2

0.69

0.63

0.70

0.60

2

0.75

0.69

0.76

0.64

0.75

0.70

2-1/2

0.81

0.75

0.80

0.70

0.77

0.73

0.85

0.79

3

0.87

0.81

0.84

0.76

0.80

0.77

0.87

0.81

3-1/4

0.91

0.87

0.88

0.82

0.84

0.81

0.89

0.85

0.75

0.70

4

1.00

1.00

0.92

0.88

0.88

0.84

0.90

0.88

0.80

0.77

5

0.96

0.94

0.91

0.88

0.91

0.90

0.84

0.78

6

1.00

1.00

0.94

0.92

0.92

0.93

0.87

0.81

7

0.97

0.95

0.94

0.95

0.89

0.84

8

1.00

1.00

0.96

0.97

0.90

0.88

9

0.98

0.98

0.91

0.91

10

1.00

1.00

0.94

0.97

11

0.97

0.97

12

1.00

1.00

Load Adjustment Factors – Edge*

Anchor Diameter

1/4

3/8

1/2

5/8

3/4

Embedment

hnom

1-3/16

2-1/2

2

3-1/2

2

3-1/2

2

3-1/2

2-1/2

4

Critical Edge

Ccr

2

2

2-3/4

4-1/8

3-3/4

6

5

6-1/4

6-1/2

7-1/4

Minimum Edge

Cmin

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

1-3/4

Actual

Edge

Cact

1-3/4

0.88

0.71

0.79

0.77

0.62

0.64

0.70

0.60

0.75

0.60

2

0.94

0.77

0.88

0.82

0.72

0.68

0.76

0.66

0.77

0.62

2-1/4

1.00

0.83

0.92

0.84

0.76

0.70

0.78

0.68

0.78

0.63

2-1/2

0.90

0.96

0.86

0.80

0.72

0.80

0.70

0.79

0.64

2-3/4

0.95

1.00

0.88

0.84

0.74

0.83

0.72

0.80

0.65

3

1.00

0.90

0.88

0.76

0.85

0.74

0.81

0.66

3-1/4

0.92

0.92

0.78

0.86

0.76

0.82

0.67

3-1/2

0.94

0.96

0.80

0.87

0.78

0.83

0.68

3-3/4

0.96

1.00

0.82

0.88

0.80

0.84

0.69

4

0.98

0.84

0.90

0.82

0.85

0.70

4-1/8

1.00

0.86

0.94

0.84

0.86

0.71

4-1/2

0.88

0.96

0.86

0.87

0.72

4-3/4

0.90

0.98

0.88

0.88

0.73

5

0.92

1.00

0.90

0.89

0.74

5-1/4

0.94

0.92

0.90

0.78

5-1/2

0.96

0.94

0.92

0.81

5-3/4

0.98

0.96

0.94

0.85

6

1.00

0.98

0.96

0.89

6-1/4

1.00

0.98

0.94

6-1/2

1.00

0.95

6-3/4

0.97

7

0.99

7-1/4

1.00


Allowable loads are calculated at one-fourth of the maximum tensile and shear capacities to reach the recommended 4:1 safety factor. Information provided only for use of qualified engineer. Use of technical data by persons not qualified could cause serious damages, injury or even death.


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