STS Industrial - Bolts & Screws

 

ASTM F3125 GRADE A490 STRUCTURAL HEAVY HEX HEAD BOLTS

GOVERNING STANDARDS:
ASTM F3125 Covers material requirements for high strength heavy hex structural bolts alloy steel, heat treated, 150 ksi minimum tensile strength.
ASME B18.2.6 Covers the complete general and dimensional data for fasteners used in structural applications.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

 

APPLICATIONS:

Intended for use in steel to steel structural connections. High strength hex bolt with heavy pattern head to increase the bearing surface, and distribute the clamping load over a larger area. Higher tensile strength with more stringent limits than A325 structural bolts. 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.

VARIATIONS:

Available in Type 1 and Type 3 (Type 2 was withdrawn from the standard in 2002). A490 Type 3 bolts are made from a corrosion resistant steel. A490M specifies metric dimensions.

CONNECTION TYPES:
 SC

Slip Critical Connection

 N

Bearing type connection with threads in the shear plane.

 X

Bearing type connection with no threads in the shear plane.

A490 Type 1

Medium Carbon and Alloy Steel

 A490 Structural Heavy Hex Head Bolt Head Marking

A490 Type 3

Weathering Steel

 A490 Type 3 Structural Heavy Hex Head Bolt Head Head Marking

Product to be marked with the manufacturer’s head marking as indicated by the X.

      MATERIAL PROPERTIES:
      Medium Carbon and Alloy Steel

      DIAMETER

      PROOF LOAD

      YIELD STRENGTH

      TENSILE STRENGTH

      CORE HARDNESS

      1/2″ through 1-1/2″ 120,000 psi 130,000 psi 150,000 – 173,000psi C33 to C39
      Elongation 14% Minimum (All Diameters)
      Reduction of Area 40% Minimum (All Diameters)
      Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale.

       

      • RECOMMENDED NUTS

        A325 Plain ASTM A563 Grade DH
        A325 Type 3 ASTM A563 Grade DH-3
        ASTM A194 Grade 2H Nuts may by supplied in place of DH nuts at the option of the manufacturer.
      • SIMILAR GRADES

      DIMENSIONAL SPECIFICATIONS:

      A490 Structural Heavy Hex Head Bolt Head Dimensions

      Sources: ASTM Standards for Mechanical Fasteners and Related Processes 2nd Edition, Inch Fastener Standards 8th Edition, Kanebridge Fastener Reference Guide 4th Edition

      Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.