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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