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The ASTM A490 specification covers quenched and tempered, alloy steel, heavy hex  structural bolts from 1/2″ diameter through 1-1/2″ diameter with a minimum 150 ksi tensile. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. Refer to the Structural Bolts page of our site for thread lengths and other related dimensions. A490 bolts are similar in application and dimensions to A325 heavy hex structural bolts but are made from an alloy steel rather than a medium carbon steel, resulting in a higher strength fastener. The A490 specification is applicable to heavy hex structural bolts only. For bolts with different thread lengths than specified for structural bolts but with similar mechanical properties, see Specification A354 grade BD. ASTM A490 bolts shall not be coated by hot-dip galvanizing, mechanical deposition, or electroplating with zinc due to the potential risk of hydrogen embrittlement. ASTM has approved coating A490 bolts with Zinc/Aluminum Corrosion Protective Coatings per ASTM F1136 Grade 3, commercially called dacromet. Additional testing in the form of Magnetic Particle Inspection for Longitudinal Discontinuities and Transverse Cracks is a requirement of the A490 specification.

A490 Types

 TYPE 1Medium carbon and alloy steel.
 TYPE 2Withdrawn in 2002.
 TYPE 3Weathering steel.
MMetric A490.

A490 Connection Types

SCSlip critical connection.
NBearing type connection with threads included in the shear plane.
XBearing type connection with threads excluded from the shear plane.

A490 Mechanical Properties

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
1/2 - 1-1/2150-1731301440

A490 Chemical Properties

Type 1 Bolts
Element Sizes 1/2 to 1-3/8 Size 1-1/2
Carbon, max0.30 - 0.48%0.35 - 0.53%
Phosphorus, max0.040%0.040%
Sulfur, max0.040%0.040%
Alloying Elements**
* Steel, as defined by the American Iron and Steel Institute, shall be considered to be alloy when the maximum range given for the content of alloying elements exceeds one of more of the following limits: Manganese, 1.65%, silicon, 0.60%, copper, 0.60%, or in which a definite range or a minimum quantity of any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: aluminum, chromium up to 3.99%, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium or any other alloying elements added to obtain a desired alloying effect.
Type 3 Bolts
Element Sizes 1/2 to 3/4 Size above 3/4
Carbon0.20 - 0.53%0.30 - 0.53%
Manganese, min0.40%0.40%
Phosphorus, max0.035%0.035%
Sulfur, max0.040%0.040%
Copper0.20 - 0.60%0.20 - 0.60%
Chromium, min0.45%0.45%
Nickel, min0.20%0.20%
Molybdenum, min0.15%0.15%

A490 Recommended Hardware

Nuts Washers
Type 1 Type 3 Type 1 Type 3

Note: Nuts conforming to A194 Grade 2H are a suitable substitute for use with A490 heavy hex structural bolts. Follow the link for an ASTM A563 Nut Compatibility Chart.


ASTM Specifications for Bolt Fasteners

 - Alloy steel and stainless steel bolting materials for high temperature or high pressure service.
  •  - Carbon steel bolts and studs, 60,000 psi tensile strength.
  •  - Alloy steel and stainless steel bolting materials for low temperature service.
  •  - Structural bolts, steel, heat treated, 120/105 ksi minimum tensile strength.
  •  - Quenched and tempered alloy bolts, studs, and other externally threaded fasteners.
  •  - Quenched and tempered steel bolts and studs for general use.
  •  - High temperature Bolting with expansion co-efficient comparable to Austenitic Stainless Steel
  •  - Structural bolts, alloy steel, heat treated, 150 ksi minimum tensile strength.
 - Standard for metric bolts, screws and studs that are used in general engineering applications
  •  - Stainless steel bolts, hex cap screws, and studs.
  •  - Anchor bolts designed to anchor structural supports to concrete foundations.

ASTM Specifications for Nuts

ASTM Specifications for Washers

- Specification for Hardened Steel Washers , carbon steel, steel, washers, weathering steel, Hardened steel washers
  • - Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use
  • - Standard Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners


Astm A490 Structural bolts Application Industries

Sunflex Metal Industries are engaged in manufacturing of robust quality of Astm A490 Structural bolts. These Astm A490 Structural bolts are widely used in the following industries:

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