STS Industrial - Bolts & Screws

 

ASTM F3125 GRADE A325 STRUCTURAL HEAVY HEX HEAD BOLTS

GOVERNING STANDARDS:
ASTM F3125  Covers material requirements for high strength heavy hex structural bolts from 1/2″ diameter through 1-1/2″ diameter.
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.

VARIATIONS:

Available in Type 1 and Type 3 (Type 2 was withdrawn from the standard in 1991). A325 Type 3 bolts are made from a corrosion resistant steel, and are only available in a plain finish. A325-T specifies a fully threaded bolt. A325M 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.

A325 Type 1

Medium Carbon, Carbon Boron, or Medium Carbon Alloy Steel

 ASTM A325 Heavy Hex Head Structural Bolt Head Marking
A325 Type 3

Weathering Steel

 ASTM A325 Type 2 Heavy Hex Head Structural Bolt Head Marking
A325T

Fully Threaded

 ASTM A325T Heavy Hex Head Fully Threaded Structural Bolt Head Marking

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

      MATERIAL PROPERTIES:
      Medium Carbon, Carbon Boron, or Medium Carbon Alloy Steel

      DIAMETER

      PROOF LOAD

      YIELD STRENGTH

      TENSILE STRENGTH

      CORE HARDNESS

      1/2″ through 1″ 85,000 psi 92,000 psi 120,000 psi C24 to C35
      1-1/8″ through 1-1/2″ 74,000 psi 81,000 psi 105,000 psi C19 to C31
      Elongation 14% Minimum (All Diameters)
      Reduction of Area 35% Minimum (All Diameters)
      Material strengths listed are minimum acceptable per governing standard. Core hardness based on Rockwell scale.

       

      DIMENSIONAL SPECIFICATIONS:

      ASTM A325 Heavy Hex Head Structural Bolt 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.