ASTM A490/A490 Type 1 Heavy Hex Structural Bolts
ASTM A490 Type 1 is a high tensile bolting grade manufactured from high tensile alloy steel intended for use in structural connections. Type 1 Bolts are produced from 1/2" to 1-1/2" in imperial size as per ASTM A490 & from M12 to M36 in metric size as per ASTM A490M. These A490 type 1 bolts can be supplied with zinc, cadmium or dacromet coatings in accordance to ASTM F1136. Ferrobend stocks raw material for quick manufacturing and shorter delivery times. We supply Type 1 boltings with EN 10204 type 3.1 certification. Please browse through the page for complete detail on chemical requirement, hardness requirement, tensile requirement, recommended nuts and washers for A490/A490M Type 1 Bolts.
ASTM A490 Type 1 Chemical Composition
| Element |
Heat Analysis % |
Product Analysis % |
| Carbon |
|
|
| For sizes through 1-3/8" |
0.30 - 0.48 |
0.28 - 0.50 |
| For sizes 1-1/2" |
0.35 - 0.53 |
0.33 - 0.55 |
| Phosphorus, max |
0.040 |
0.045 |
| Sulfur, max |
0.040 |
0.045 |
ASTM A490M Type 1 Mechanical Requirement (Metric)
| Nominal Diameter, mm |
Tensile Strength, min, Mpa |
Yield Strength, min, Mpa |
Elongation in 4D, min, % |
Reduction in Area, min, % |
| M12 to M36, Inclusive |
1040 - 1210 |
940 |
14 |
40 |
ASTM A490 Type 1 Mechanical Requirement (Imperial)
| Nominal Diameter, inch |
Tensile Strength, min, ksi |
Yield Strength, min, ksi |
Elongation in 4D, min, % |
Reduction in Area, min, % |
| 1/2" to 1-1/2", Inclusive |
150 - 173 |
130 |
14 |
40 |
Hardness Requirements for ASTM A490M Bolts (Metric)
| Bolt Size, mm |
Bolt Length*, mm |
Brinell |
Rockwell C |
| min |
max |
min |
max |
| M12 to M24, inclusive |
Less than 2D |
311 |
352 |
33 |
39 |
| M12 to M24, inclusive |
2D and over |
-- |
352 |
-- |
39 |
| M25 to M36, Inclusive |
Less than 3D |
311 |
352 |
33 |
39 |
| M25 to M36, Inclusive |
3D and over |
-- |
352 |
-- |
39 |
Note* : Heavy Hex Structural Bolts M24 and smaller and shorter than 2D are subject only to minimum and maximum hardness. Heavy hex structural bolts larger than M24 through M36 inclusive in diameter and shorter than 3D are subject only to minimum and maximum hardness.
Hardness Requirements for ASTM A490 Bolts (Imperial)
| Bolt Size, mm |
Bolt Length*, mm |
Brinell |
Rockwell C |
| min |
max |
min |
max |
| 1/2" to 1", inclusive |
Less than 2D* |
311 |
352 |
33 |
39 |
| 1/2" to 1", inclusive |
2D and over |
-- |
352 |
-- |
39 |
| 1-1/8" to 1-1/2", inclusive |
Less than 3D |
311 |
352 |
33 |
39 |
| 1-1/8" to 1-1/2", inclusive |
3D and over |
-- |
352 |
-- |
39 |
Note* : Heavy Hex Structural Bolts 1" and smaller and shorter than 2D are subject only to minimum and maximum hardness. Heavy hex structural bolts larger than 1" through 1-1/2" inclusive in diameter and shorter than 3D are subject only to minimum and maximum hardness.
ASTM A490/A490M Type 1 Heat Treatment
Type 1 and Type 3 bolts shall be heat treated by quenching in oil from the austenitic temperature and then tempered by reheating to a temperature of not less then 800°F.
Recommended Nuts
| Bolt Type and Finish |
Nut Class and Finish Specification |
| Plain (noncoated) |
ASTM A563-DH, DH3, plain (uncoated) |
| Weathering steel |
ASTM A563-DH3, weathering steel |
Recommended Washers
| Bolt Type and Finish |
Washer Finish |
| Plain (noncoated) |
Plain (uncoated) |
| Weathering steel |
Weathering steel |
ASTM A490/A90M Type 1 Bolt Marking
| Grade |
Marking |
| A490 / A490M Type 1 |
A490 / A490M |