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Views: 0 Author: Site Editor Publish Time: 2022-11-04 Origin: Site
US Bolts | |||||
| Head Marking | Grade and Material | Nominal Size Range (inches) | Mechanical Properties | ||
|---|---|---|---|---|---|
| Proof Load (psi) | Min. Yield Strength (psi) | Min. Tensile Strength (psi) | |||
 | 307ALow carbon steel | 1/4" thru 4" | N/A | N/A | 60,000 |
 No Markings | Grade 2Low 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 | ||
 3 Radial Lines | Grade 5Medium 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 | ||
 6 Radial Lines | Grade 8Medium carbon alloy steel, quenched and tempered | 1/4" thru 1-1/2" | 120,000 | 130,000 | 150,000 |
 | Grade A325Carbon or alloy steel with or without boron | 1/2" thru 1-1/2" | 85,000 | 92,000 | 120,000 |
| Stainless Markings Vary | 18-8 & 316 StainlessSteel alloy with chromium and nickel | All sizes thru 1" | N/A | 20,000 Min. 65,000 Typical | 65,000 Min. 100,000 – 150,000 Typical |
 | 651 Silicon bronzeAn alloy of mostly copper and tin with a small amount of silicon | 1/4" thru 3/4" | N/A | 55,000 | 70,000 |
| 7/8" thru 1-1/2" | N/A | 40,000 | 55,000 | ||
 | Aluminum 2024Aluminum alloy with copper, magnesium and manganese; solution heat treated and age hardened | All sizes | N/A | 36,000 | 55,000 |
Metric Bolts | |||||
| Head Marking | Class and Material | Nominal Size Range (mm) | Mechanical Properties | ||
| Proof Load (MPa) | Min. Yield Strength (MPa) | Min. Tensile Strength (MPa) | |||
 | Class 8.8Medium carbon steel, quenched and tempered | All sizes below 16mm | 580 | 640 | 800 |
| 16mm - 72mm | 600 | 660 | 830 | ||
 | Class 10.9Alloy steel, quenched and tempered | 5mm - 100mm | 830 | 940 | 1040 |
 | Class 12.9Alloy steel, quenched and tempered | 1.6mm - 100mm | 970 | 1100 | 1220 |
| Usually Stamped A-2 or A-4 | A-2 & A-4 StainlessSteel alloy with chromium and nickel | All sizes thru 20mm | N/A | 210 Min. | 500 Min. |
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. 1MPa = 1N/mm2 = 145 pounds/inch2 | |||||
