Bolts

 

US (Imperial) Bolts

Mechanical Properties
Grade and Material Nominal Size Range(inches) Proof Load(psi) Min. Yield Strength (psi) Min. Tensile Strength(psi)

Grade 2

No Markings. Low or medium carbon steel
1/4 thru 3/4 55,000 57,000 74,000
Over 3/4 thru 1-1/2 33,000 36,000 60,000

Grade 5

3 Radial Lines. Medium Carbon Steel, Quenched and Tempered
1/4 thru 1 85,000 92,000 120,000
Over 1 thru 1-1/2 74,000 81,000 105,000
Grade 8 6 Radial Lines. Medium Carbon Alloy Steel, Quenched and Tempered

1/4 thru 1-1/2 120,000 130,000 150,000

18-8 Stainless

Markings vary. Most is non-magnetic. Alloy w/17-19% Chromium & 8-13% Nickel
1/4 thru 5/8 40,000 Min. 80,000 – 90,000 Typical 100,000 – 125,000 Typical
3/4 thru 1 40,000 Min. 45,000 – 70,000 Typical 100,000 Typical
Above 1 80,000 – 90,000 Typical

Metric bolts

Class and Material Nominal Size Range(mm) Mechanical Properties
Proof Load(MPa) Min. Yield Strength(MPa) Min. Tensile Strength(MPa)

Class 8.8

Medium Carbon Steel, Quenched and Tempered
All Sizes below 16mm 580 640 800
16mm – 72mm 600 660 830
Class 10.9 Alloy Steel, Quenched and Tempered

5mm – 100mm 830 940 1040
Class 12.9 Alloy Steel, Quenched and Tempered

1.6mm – 100mm 970 1100 1220
A-2 Stainless Markings vary. Most is non-magnetic. Alloy w/17-19% Chromium & 8-13% Nickel

All Sizes thru 20mm 210 Min.450 Typical 500 Min.700 Typical
Tensile Strength: maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.  Yield Strength: 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.

1MPa = 1N/mm2 = 145 pounds/inch2

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