square head lag bolts

Product Details

Square head lag bolts offer a large bearing area for positive gripping with an open or adjustable wrench. Length is measured from under the head. Head width or wrench size is measured across the flats. Plain finish, or bare metal, may or may not have a coating of light oil to resist corrosion


The information below lists the required dimensional, chemical and physical characteristics of the fasteners in this purchase order. If the order received does not meet these requirements, it may result in a supplier corrective action request, which could jeopardize your status as an approved vendor. Unless otherwise specified, all referenced consensus standards must be adhered to in their entirety.


Nomial Size or Basic Product Diameter

EFHRLT
Full-Size Body DiameterWidth Across FlatsHead HeightRadius of Fillet

Thread Length for Bolts Lengths

6 in. and ShorterOver 6 in.

Max

Min

Basic

Max

Min

BasicMax

Min

Max

Min

Nom

1/4

0.2500

0.260

0.237

3/80.3750.36211/64

0.188

0.156

0.03

0.01

0.750

1.000

5/16

0.3125

0.324

0.298

1/2

0.500

0.484

13/64

0.220

0.186

0.875

1.125

38

0.3750

0.388

0.360

9/16

0.562

0.544

1/4

0.268

0.323

1.000

1.250

7/16

0.4375

0.452

0.421

5/8

0.625

0.603

19/64

0.316

0.278

1.125

1.375

1/2

0.5000

0.515

0.482

3/4

0.750

0.725

21/64

0.348

0.308

1.250

1.500

5/8

0.6250

0.642

0.605

15/16

0.938

0.906

27/64

0.444

0.400

0.06

0.02

1.500

1.750

3/4

0.7500

0.768

0.729

1-1/8

1.125

1.088

1/2

0.524

0.476

1.750

2.000

7/8

0.8750

0.895

0.852

1-5/16

1.312

1.269

19/32

0.620

0.568

2.000

2.250

1

1.0000

1.022

0.976

1-1/2

1.500

1.450

21/32

0.684

0.628

0.09

0.03

2.250

2.500

1-1/8

1.1250

1.149

1.098

1-11/16

1.688

1.631

3/4

0.780

0.720

2.500

2.750

1-1/4

1.2500

1.277

1.223

1-7/8

1.875

1.812

27/32

0.876

0.812

2.750

3.000
1-3/8

1.3750

1.404

1.345

2-1/16

2.062

1.994

29/32

0.940

0.872

3.000

3.250
1-1/2

1.5000

1.531

1.470

2-1/4

2.250

2.1751

1.036

0.964

3.250

3.500


Specification Requirements:

Dimensions: ASME B18.2.1
Material &Mechanical Properties: ASTM A307, Grade A
Thread Requirements: ASME B1.1, UNC & UNF, Class 2A
Finish:Light Protective Oil
Head Marking: Manufacturer ID and 307A

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