Hex Cap Csrews

These properties ar etested only on machined specimens when the testing machine cannot provide for full testing of the parts.
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Product Details

Name: HEX CAP SCREW OR BOLT DIN931Description :A cap screw made from medium carbon steel and heat-treated and stainless steel A2 and A4

Applications or Advantages: Has greater tensile strength than a Grade-2 or Grade-5 orGrade-8 Yield-to-tensile ratio is the lowest of all heat treated steels.


Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw.

ASME
HEX CAP SCREWS B18.2.1-1996

Nominal or
Basic Product
Diameter

E

F

G

H

J

LT

Y

Body
Diameter

Width Across Flats

Width Across
Corners

Head Height

Wrenching
Height

Thread Length

Transition
Thread
Length

For Screw
Lengths
≤ 6 in.

For Screw
Lengths
> 6 in.

Max

Min

Basic

Max

Min

Max

Min

Basic

Max

Min

Min

Ref

Ref

Max

1/4

0.2500

0.2500

0.2450

7/16

0.438

0.428

0.505

0.488

5/32

0.163

0.150

0.106

0.750

1.000

0.250

5/16

0.3125

0.3125

0.3065

1/2

0.500

0.489

0.577

0.557

13/64

0.211

0.195

0.140

0.875

1.125

0.278

3/8

0.3750

0.3750

0.3690

9/16

0.562

0.551

0.650

0.628

15/64

0.243

0.226

0.160

1.000

1.250

0.312

7/16

0.4375

0.4375

0.4305

5/8

0.625

0.612

0.722

0.698

9/32

0.291

0.272

0.195

1.125

1.375

0.357

1/2

0.5000

0.5000

0.4930

3/4

0.750

0.736

0.866

0.840

5/16

0.323

0.302

0.215

1.250

1.500

0.385

9/16

0.5625

0.5625

0.5545

13/16

0.812

0.798

0.938

0.910

23/64

0.371

0.348

0.250

1.375

1.625

0.417

5/8

0.6250

0.6250

0.6170

15/16

0.938

0.922

1.083

1.051

25/64

0.403

0.378

0.269

1.500

1.750

0.455

3/4

0.7500

0.7500

0.7410

1-1/8

1.125

1.100

1.299

1.254

15/32

0.483

0.455

0.324

1.750

2.000

0.500

7/8

0.8750

0.8750

0.8660

1-5/16

1.312

1.285

1.516

1.465

35/64

0.563

0.531

0.378

2.000

2.250

0.556

1

1.0000

1.0000

0.9900

1-1/2

1.500

1.469

1.732

1.675

39/64

0.627

0.591

0.416

2.250

2.500

0.625

1-1/8

1.1250

1.1250

1.1140

1-11/16

1.688

1.631

1.949

1.859

11/16

0.718

0.658

0.461

2.500

2.750

0.714

1-1/4

1.2500

1.2500

1.2390

1-7/8

1.875

1.812

2.165

2.066

25/32

0.813

0.749

0.530

2.750

3.000

0.714

1-1/2

1.5000

1.5000

1.4880

2-1/4

2.250

2.175

2.598

2.480

1-5/16

0.974

0.902

0.640

3.250

3.500

0.833


Tolerance on Length

Nominal Screw
Size

Nominal Screw Length

Up to 1 in., incl.

Over 1 in. to
2-1/2 in., incl.

Over 2-1/2 in. to
4 in., incl.

Over 4 in. to 6 in., incl.

Longer than 6 in.

1/4 to 3/8

-0.03

-0.04

-0.06

-0.10

-0.18

7/16 and 1/2

-0.03

-0.06

-0.08

-0.10

-0.18

9/16 to 3/4

-0.03

-0.08

-0.10

-0.10

-0.18

7/8 and 1

....

-0.10

-0.14

-0.16

-0.20

1-1/8 to 1-1/2

....

-0.12

-0.16

-0.18

-0.22

1

GRADE-5 HEX CAP SCREW

Description

A cap screw made from medium carbon steel and heat-treated.

Applications

steels.

Has greater tensile strength than a Grade-2. Yield-to-tensile ratio is the lowest of all heat treated

Heat Treatment

Grade-5 cap screws shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum tempering

temperature of 800°F.

Material

Medium carbon steel. Use of an alloy steel is also acceptable.

Core Hardness

1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34.

1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30.

Surface Hardness

1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum.

1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum.

Proof Load

1/4 through 1 in. diameter, all lengths: 85,000 psi.

1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi.

Yield Strength*

1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum

1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum

Tensile Strength

1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum

1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum

Elongation*

14% minimum (all diameters)

Reduction of Area*

35% minimum (all sizes)


GRADE-8 HEX CAP SCREW

Description

A cap screw made from medium carbon alloy steel and heat-treated.

Applications/

Advantages

Has greater tensile strength than a Grade-5. Designed for use in high stress applications. See specifications below for more information on how the

Grade-8 exceeds the strength of a Grade-5.

Heat Treatment

Grade-8 cap screws shall be heat-treated, oil-quenched and tempered at a minimum temperature of 800°F.

Material

Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 inch, it is permissible to use AISI 1541 steel.

Core Hardness

1/4 through 1-1/2 in. diameter, all lengths: Rockwell C33 - C39.

Surface Hardness

1/4 through 1-1/2 in. diameter, all lengths: Rockwell 30N58.6 maximum.

Proof Load

1/4 through 1-1/2 in. diameter, all lengths: 120,000 psi.

Yield Strength*

1/4 through 1-1/2 in. diameter, all lengths: 130,000 psi. minimum

Tensile Strength

1/4 through 1-1/2 in. diameter, all lengths: 150,000 psi. minimum

Elongation*

12% minimum (all diameters)

Reduction of

Area*

35% minimum (all sizes)


· These properties ar etested only on machined specimens when the testing machine cannot provide for full testing of the parts.

· Product standards require the manufacturer’s head marking to appear on the top of all cap screws1/4” diameter and larger. “X” represents on location such a marking may appear.


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