LBS Catalog

Technical Information

HEX CAP SCREWS DIMENSIONAL DATA ANSI B18:2.1

Resources

THREADS TO CLASS 2A TOLERANCE

THREAD

THREADS PER INCH

PITCH DIAMETER

THREAD LENGTH

BODY DIAMETER

WIDTH ACROSS FLATS

HEIGHT OF HEAD

HEX ACROSS CORNERS

SIZE

TL

D

A

H

B

Nom.

Min.

Max.

Min.

Min.

Max.

Nom.

Min.

Max.

Nom.

Min.

Max.

Min.

Max.

NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF NC NF

20 28 18 24 16 24 14 20 13 20 12 18 11 18 10 16

0.2127 0.2225 0.2712 0.2806 0.3287 0.3430 0.3850 0.3995 0.4435 0.4619 0.5016 0.5205 0.5589 0.5828 0.6773 0.7029 0.7946 0.8216 0.9100 0.9463 1.0228 1.0631 1.1476 1.1879 1.2563 1.3127 1.3812 1.4376

0.2164 0.2258 0.2752 0.2843 0.3331 0.3468 0.3897 0.4037 0.4485 0.4662 0.5068 0.5250 0.5644 0.5875 0.6832 0.7079 0.8009 0.8270 0.9168 0.9519 1.0300 1.0691 1.1550 1.1941 1.2643 1.3190 1.3893 1.4440

1/4

3/4

.2450

.2500

7/16

.4280

.4375

5/32

.150

.163

.488

.505

5/16

7/8

.3065

.3125

1/2

.4890

.5000

13/64

.195

.211

.557

.577

3/8

1

.3690

.3750

9/16

.5510

.5625

15/64

.226

.243

.628

.650

7/16

1-1/18

.4305

.4375

5/8

.6120

.6250

9/32

.272

.291

.698

.722

1/2

1-1/4

.4930

.5000

3/4

.7360

.7500

5/16

.302

.323

.840

.866

9/16

1-3/8

.5545

.5625

13/16

.7980

.8125

23/64

.348

.371

.910

.938

5/8

1-1/2

.6170

.6250

15/16

.9220

.9375

25/64

.378

.403

1.051

1.083

3/4

1-3/4

.7410

.7500

1-1/8

1.1000

1.1250

15/32

.455

.483

1.254

1.299

9

7/8

2

.8660

.8750

1-5/16

1.2850

1.3125

35/64

.531

.563

1.465

1.516

14

8

1

2-1/4

.9900

1.0000

1-1/2

1.4690

1.5000

39/64

.591

.627

1.675

1.732

14

7

1-1/8

2-1/2

1.1140

1.1250

1-11/16

1.6310

1.6875

11/16

.658

.718

1.859

1.949

12

7

1-1/4

2-3/4

1.2390

1.2500

1-7/8

1.8120

1.8750

25/32

.749

.813

2.066

2.165

12

6

1-3/8

3

1.3630

1.3750

2-1/16

1.9940

2.0625

27/32

.810

.878

2.273

2.382

12

6

1-1/2

3-1/4

1.4880

1.5000

2-1/4

2.1750

2.2500

15/16

.902

.974

2.480

2.598

12

ASTM, SAE AND ISO GRAD MARKINGS AND MECHANICAL PROPERTIES FOR STEEL FASTERNERS

Tensile Strength min.,ps i

Grade Marking

Specification

Material

Bolt and Screw

Proof Load.

Size in.

psi

1/4 thru 1-1/2 1/4 thru 1-1/2

33,000 33,000 55,000 33,000 85,000 74,000 85,000 74,000 55,000 85,000 78,000 74,000

60,000 60,000 55,000 74,000 60,000 120,000 105,000 120,000 105,000 90,000 120,000 115,000 105,000

SAE-Grade 1 ASTM-A 307 SAE-Grade 2 SAE-Grade 5 ASTM-A 449

Low Carbon Steel

Over 1-1/2 thru 4

1/4 thru 3/4

Low Carbon Steel

Over 3/4 thru 1-1/2

1/4 thru 1

Assortments A-12 Fasteners F-72

Over 1 thru 1-1/2

Medium Carbon Steel, Quenched and Tempered

1/4 thru 1

Over 1 thru 1-1/2 Over 1-1/2 thru 3

Cutting Tools C-329

1/2, 5/8, 3/4

Medium Carbon Steel Quenched and Tempered

ASTM-A 325

7/8, 1

1-1/8 thru 1-1/2

Pipe Fittings P-546 Electrical E-709 Hydraulics H-749

SAE-Grade 8

Medium Carbon Alloy Steel, Quenched and Tempered Alloy Steel, Quenched and Tempered Alloy Steel, Quenched and Tempered

1/4 thru 1-1/2

120,000

150,000

ASTM-A 354 Grade BD

1/2 thru 2-1/2

120,000 105,000

150,000 140,000

ASTM-A 490

Abrasives AB-787 MRO M-838

Over 2-1/2 thru 4

ASTM Specifications

A 307- Low Carbon Steel Externally and Internally Threaded Standard Fasteners A 325- High Strength Steel Bolts for Structural Steel Joints, Including Suitable Nuts and Plain Hardened Washers. A 449 - Quenched and Tempered Steel Bolts and Studs A 490 - High Strength Alloy Steel Bolts for Structural Steel Joints, including Suitable Nuts and Plain Hardened Washers.

Tel: (225) 272-6200

Fax: (225) 272-7001

sales@lbsbr.com

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R-864