ASTM A490 Hex Head HDG YZP BLACK ZP Steel Hex Bolt

Place of Origin CHINA
Brand Name QBH
Certification ISO9001
Model Number ASTM A490 1/2 to 1-1/2
Minimum Order Quantity 900kg
Price Negotiation
Packaging Details 25kg Carton+900kg/Pallet
Delivery Time 30days
Payment Terms L/C, T/T,OA
Supply Ability 500TON/MONTH

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Product Details
Material Carbon Steel Size 1/2 To 1-1/2
Surface Treatment Plain,Zinc,Black,H.D.G Grade A325
Process Cold Forging,Hot Forging Sample Free Sample
Packaging 25kg Carton+900kg/Pallet Head Type Hex Head
Application Industry,BUILDING Length 10mm-800mm
High Light

A490 Steel Hex Bolt


ZP Steel Hex Bolt


ASTM Heavy Hex Structural Bolts

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Product Description

ASTM A490 Hex Head HDG YZP BLACK ZP Steel Hex Bolt


This specification covers two types of quenched and tempered, alloy steel, heavy hex structural bolts having a tensile strength of 150 to 173 ksi.

Formerly under the jurisdiction of Committee F16 on Fasteners, this specification was withdrawn in May 2016 and replaced by Specification F3125/F3125M for High Strength Structural Bolts, Steel and Alloy Steel, Heat Treated, 120 ksi (830 MPa) and 150 ksi (1040 MPa) Minimum Tensile Strength, Inch and Metric Dimensions. Specification F3125/F3125M supersedes and replaces specifications; A325, A325M, A490, A490M, F1852 and F2280. The unified Specification F3125/F3125M corrects known inconsistencies in the original documents and the combination will assure that requirements of the products covered under the original standards stay aligned.


ASTM Standards

A194/A194M Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

A325 Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength

A354 Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners

A490M Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints (Metric)

A563 Specification for Carbon and Alloy Steel Nuts

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

D3951 Practice for Commercial Packaging

E384 Test Method for Knoop and Vickers Hardness of Materials

E709 Guide for Magnetic Particle Testing

E1444 Practice for Magnetic Particle Testing

F436 Specification for Hardened Steel Washers

F606 Test Methods for Determining the Mechanical Properties of Externally and Internally Threaded Fasteners, Washers, Direct Tension Indicators, and Rivets

F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series

F959 Specification for Compressible-Washer-Type Direct Tension Indicators for Use with Structural Fasteners

F1136 Specification for Zinc/Aluminum Corrosion Protective Coatings for Fasteners

F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

F1789 Terminology for F16 Mechanical Fasteners

F2328 Test Method for Determining Decarburization and Carburization in Hardened and Tempered Threaded Steel Bolts, Screws, Studs, and Nuts

F2833 Specification for Corrosion Protective Fastener Coatings with Zinc Rich Base Coat and Aluminum Organic/Inorganic Type

G101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels

ASME Standards

B1.1 Unified Screw Threads

B18.2.6 Fasteners for Use in Structural Applications

B18.24 Part Identification Number (PIN) Code System Standard for B18 Fastener Products






ASTM A490 Hex Head HDG YZP BLACK ZP Steel Hex Bolt 0

Screw Thread
1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2
ds max
s Nominal Size
e max
k Nominal Size
b Ref.
0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404 1.531
0.482 0.605 0.729 0.852 0.976 1.098 1.223 1.345 1.47
7/8 1-1/16 1-1/4 1-7/16 1-5/8 1-13/16 2 2-3/16 2-3/8
0.875 1.062 1.25 1.438 1.625 1.812 2 2.188 2.375
0.85 1.031 1.212 1.394 1.575 1.756 1.938 2.119 2.3
1.01 1.227 1.443 1.66 1.876 2.093 2.309 2.526 2.742
0.969 1.175 1.383 1.589 1.796 2.002 2.209 2.416 2.622
5/16 25/64 15/32 35/64 39/64 11/16 25/32 27/32 15/16
0.323 0.403 0.483 0.563 0.627 0.718 0.813 0.878 0.974
0.302 0.378 0.455 0.531 0.591 0.658 0.749 0.81 0.902
1 1.25 1.38 1.5 1.75 2 2 2.25 2.25




Note: In 2016, ASTM A490 was officially withdrawn and replaced by ASTM F3125, in which A490 now becomes a grade under the F3125 specification. The F3125 specification is a consolidation and replacement of six ASTM standards, including; A325, A325M, A490, A490M, F1852, and F2280. We are choosing to keep this technical information about the now obsolete A490 specification on our website for reference and informational purposes only.



Prior to its withdrawl in 2016, the ASTM A490 specification covered 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 Geomet. 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 1 Medium carbon and alloy steel.
TYPE 2 Withdrawn in 2002.
TYPE 3 Weathering steel.
M Metric A490.

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 Bolts
Element Sizes 1/2 to 1-3/8 Size 1-1/2
Carbon, max 0.30 - 0.48% 0.35 - 0.53%
Phosphorus, max 0.040% 0.040%
Sulfur, max 0.040% 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
Carbon 0.20 - 0.53% 0.30 - 0.53%
Manganese, min 0.40% 0.40%
Phosphorus, max 0.035% 0.035%
Sulfur, max 0.040% 0.040%
Copper 0.20 - 0.60% 0.20 - 0.60%
Chromium, min 0.45% 0.45%
Nickel, min 0.20% 0.20%
Molybdenum, min 0.15% 0.15%

A490 Recommended Hardware

Nuts Washers
Type 1 Type 3 Type 1 Type 3
A563DH A563DH3 F436-1 F436-3
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.




Process flow


Cold forging

Annealing treatment(if need) ➨ wiredrawing ➨ clod forging ➨ thread rolling ➨make heat treatmentFinish Packing


Hot forging

Cutting material hot forging turning shrink diameter(half thread)thread rolling make heat treatmentFinish Packing






Materials and Chemical compstition




C Si Mn P S Cr Ni Cu
0.45 0.23 0.58 0.014 0.006 0.057 0.008 0.016



C Si Mn P S Cr Ni Cu
0.4 0.21 0.54 0.015 0.008 0.95 0.02 0.02



C Si Mn P S Cr Ni Cu Mo
0.35 0.22 0.59 0.01 0.003 0.93 0.01 0.01 0.21




C Si Mn P S Cr Ni Cu Mo
0.42 0.27 0.92 0.013 0.004 1.01 0.03 0.04 0.2



















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The advantages of QBH

  • QBH brand sales to the main quality assurance.
  • Years of export trade management, excellent service, word-of-mouth guarantee.
  • By working with TUV,escort for quality.
  • Customization of non-standard parts can be made according to customer's requirements and drawings.
  • For quality customers,we can provide a certain credit period.


Heavy hex head structural bolts from QBH company help you secure steel-to-steel structural connections. These rugged steel bolts come in galvanized, hot dipped galvanized, yellow zinc and plain finishes. Choose the thread size, thread length and overall length you need from a selection that numbers more than 1ton. When you need structural bolts, come to QBH first and get the job done right.