ASTM A490
A490 is a ASTM International specification for heavy hex structural bolts. A490 covers two types of quenched and tempered, alloy steel heavy hex structural bolts having a tensile strength of 150 to 173 ksi. These bolts are intended for structural connections and are furnished in sizes 1/2" to 1-1/2" inclusive.
ASTM A490
A490 is a ASTM International specification for heavy hex structural bolts.
A490 covered two types of quenched and tempered, alloy steel heavy hex structural bolts having a tensile strength of 150 to 173 ksi. These bolts are intended for structural connections and are furnished in sizes 1/2" to 1-1/2" inclusive. It was withdrawn in 2016 and became a grade of F3125. However, A490 is still commonly referred to, so it is listed here for reference.
A490 TYPES
A490 Type 1:
Medium carbon and alloy steel.
A354 Type 3:
Weathering steel.
NOTE: There are other types of A490. The one listed here is the one we receive the most requests for. For information on other types, please contact one of our salesmen.
A490 CONNECTION TYPES
SC:
Slip critical connection.
N:
Bearing type connection with threads included in the shear plane.
X:
Bearing type connection with threads excluded from the shear plane.
A490 MECHANICAL PROPERTIES |
||||
|---|---|---|---|---|
| Size | Tensile, ksi | Yield, ksi | Elong.% min | RA% min |
| 1/2" - 1-1/2" | 150 - 173 | 130 | 14 | 40 |
A490 CHEMICAL PROPERTIES |
||||
|---|---|---|---|---|
| Type 1 | Type 3 | |||
| Element | 1/2" - 1-3/8" | 1-1/2" | 1/2" - 3/4" | Above 3/4" |
| Carbon | 0.30% - 0.48% | 0.35% - 0.53% | 0.20% - 0.53% | 0.30% - 0.53% |
| Phosphorus, max | 0.040% | 0.040% | 0.035% | 0.035% |
| Sulfur, max | 0.040% | 0.040% | 0.040% | 0.040% |
| Manganese, min | - | - | 0.40% | 0.40% |
| Copper | - | - | 0.20% - 0.60% | 0.20% - 0.60% |
| Chromium, min | - | - | 0.45% | 0.45% |
| Nickel, min | - | - | 0.20% | 0.20% |
| or | ||||
| Molybdenum, min | - | - | 0.15% | 0.15% |
NOTE
Steel, as defined by the American Iron and Steel Institute, shall be considered to be alloy when the max range given for the content of alloying elements exceeds one of more of the following limits:
Manganese 1.65%
Silicon 0.6%
Copper 0.6%
Or in which a definite range or minimum quantity of any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels.
Nickel
Titanium
Tungsten
Vanadium
Zirconium
Aluminum
Chromium (up to 3.99%)
Cobalt
Columbium
Molybdenum
Or any other alloying elements added to obtain a desired alloying effect.
A490 RECOMMENDED HARDWARE |
||
|---|---|---|
| Type | Nut | Washer |
| Type 1 | A563 Grade DH | F436 Type 1 |
| Type 3 | A563 Grade DH3 | F436 Type 3 |
Note: A194 Grade 2H nuts are suitable for use with A490 heavy hex structural bolts.