Bolt Grade Markings And Strength Chart - Head Markings, Material, Proof, Yield, Tensile Strength n2q5b

Bolt Grade Markings and Strength Chart - Head Markings, Material, Proof, Yield, Tensile Strength

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Fastener Information General

Bolt Grade Markings and Strength Chart Printer friendly version

Measuring Fasteners

Thread Pitches

Head Markings

Grade or Class

Nominal Size Range

Material

Material Grade

(Inches)

Mechanical Properties Proof Load (psi)

Minimum Yield Strength (psi)

Minimum Tensile Strength (psi)

1/4 thru 3/4

55,000

57,000

74,000

Over 3/4 thru 1-1/2

33,000

36,000

60,000

1/4 thru 1

85,000

92,000

120,000

Over 1 thru 1-1/2

74,000

81,000

105,000

120,000

130,000

150,000

American Bolts

Bolt Grade Markings and Strength Chart

Grade 2

Low or Medium Carbon Steel

Unit Conversions Other Useful Information

Printable Fastener Tools

No Markings

Grade 5

More Printable Tools Our Printable PDF Tools Page has more charts and tools, in PDF format, that you can print and use in your shop.

Medium Carbon Steel, Quenched and Tempered

3 Radial Lines

Grade 8

Medium Carbon Alloy Steel, Quenched and Tempered

1/4 thru 1-1/2

18-8 Stainless

Steel alloy with 1719% Chromium and 8-13% Nickel

1/4 thru 5/8

80,000 – 90,000

100,000 – 125,000

3/4 thru 1

45,000 – 70,000

100,000

6 Radial Lines

Stainless markings vary. Most stainless is nonmagnetic

Above 1

80,000 – 90,000

Metric Bolts Class 8.8

Medium Carbon Steel, Quenched and Tempered

8.8

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All Sizes thru 1-1/2

85,000

92,000

120,000

Bolt Grade Markings and Strength Chart - Head Markings, Material, Proof, Yield, Tensile Strength Class 10.9

Alloy Steel, Quenched and Tempered

All Sizes thru 1-1/2

A-2 Stainless

Steel alloy with 1719% Chromium and 8-13% Nickel

120,000

130,000

150,000

1/4 thru 5/8

80,000 – 90,000

100,000 – 125,000

3/4 thru 1

45,000 – 70,000

100,000

10.9 Stainless markings vary. Most stainless is nonmagnetic

Above 1

80,000 – 90,000

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Yield Strength: The maximum load at which a material exhibits a specific permanent deformation Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.

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