| Structural Bolts, A325 & A490: Head & Thread Dimensions (ASME 18.2.6-1996) | |||||||||||||||
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Nominal * or Basic Product Diameter Click on Size to Shop Products |
Body Diameter (E) | Width Across Flats (F) |
Width Across Corners (G) | Head Height (H) | Radius of Fillet (R) | Thread Length (LT) | Transition Thread Length (Y) | ||||||||
| Max | Min | Basic | Max | Min | Max | Min | Basic | Max | Min | Max | Min | Ref | Max Ref | ||
| 1/2 | .5000 | .515 | .482 | 7/8 | .875 | .850 | 1.010 | .969 | 5/16 | .323 | .302 | .031 | .009 | 1.00 | .19 |
| 5/8 | .6250 | .642 | .605 | 1-1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 25/64 | .403 | .378 | .062 | .021 | 1.25 | .22 |
| 3/4 | .7500 | .768 | .729 | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.383 | 15/32 | .483 | .455 | .062 | .021 | 1.38 | .25 |
| 7/8 | .8750 | .895 | .852 | 1-7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 35/64 | .563 | .531 | .062 | .031 | 1.50 | .28 |
| 1 | 1.0000 | 1.022 | .976 | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 39/64 | .627 | .591 | .093 | .062 | 1.75 | .31 |
| 1-1/8 | 1.1250 | 1.149 | 1.098 | 1-13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 11/16 | .718 | .658 | .093 | .062 | 2.00 | .34 |
| 1-1/4 | 1.2500 | 1.277 | 1.223 | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 25/32 | .813 | .749 | .093 | .062 | 2.00 | .38 |
| 1-3/8 | 1.3750 | 1.404 | 1.345 | 2-3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 27/32 | .878 | .810 | .093 | .062 | 2.25 | .44 |
| 1-1/2 | 1.5000 | 1.531 | 1.470 | 2-3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 15/16 | .974 | .902 | .093 | .062 | 2.25 | .44 |
* Click on the nominal size to find products.
| Structural Bolts, A325 & A490: Tolerance on Length | ||||
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| Nominal Screw Size |
Nominal Screw Length | |||
| Up to 6" | Longer than 6" | |||
| 1/2 | -.12 | -.19 | ||
| 5/8 | -.12 | -.25 | ||
| 3/4 - 1 | -.19 | -.25 | ||
| 1-1/8 - 1 | -.25 | -.25 | ||
| Structural Bolts, A325 & A490 : Performance & Mechanical Stats | ||||
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ASTM A490, Type 3
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| Description | A heavy hex bolt made of medium carbon steel. The bearing surface shall be flat and washer faced, and the point is chamfered. | A heavy hex bolt made of alloy steel. The bearing surface shall be flat and washer faced, and the point is chamfered. | ||
| Applications | Commonly used in structural steel joints in heavy construction. | Used in structural steel joints in heavy construction when greater yield strengths than those of an A325 bolt are required. | Used in structural steel joints in heavy construction when greater yield strengths than those of an A325 bolt are required. A Type 3 bolt is approx. twice as resistant to corrosion as Type 1 bolt. | |
| Material |
Carbon steel | Alloy Steel | Corrosion-Resistant Steel | |
| Heat Treatment | Heat treated, quenched in a liquid medium from above the austenitizing temperature and then tempering by reheating to a temperature of at least 800 Degrees (F) | Heat treated, quenched in oil from above the transformation temperature and then tempered by reheating to a temperature of at least 800 Degrees (F). | Heat treated, quenched in a suitable liquid from above the transformation temperature then tempered by reheating to a temperature of at least 800 Degrees (F). | |
| Hardness |
1/2"- 1" D: Rockwell C24-35 1-1/8"- 1-1/2" D: Rockwell C19-31 |
Rockwell C33-38 | ||
| Proof Load |
1/2"- 1" D: 85,000 psi 1-1/8"- 1-1/2" D: 74,000 psi |
120,000 psi |
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| Yield Strength |
1/2"- 1" D: 92,000 psi min 1-1/8"- 1-1/2" D: 81,000 psi min |
130,000 psi min |
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| Tensile Strength |
1/2"- 1" D: 120,000 psi min 1-1/8"- 1-1/2" D: 105,000 psi min |
150,000 - 170,000 psi |
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