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A325 and A490 Structural Bolts



ASTM A325 bolts are supplied as plain or galvanized (mechanical or hot dipped). We offer A325 bolts as Type 1, Type 3 (weathering steel), or A325T (thread-to-head, in lengths up to four times diameter, and 105 ksi over 1". The Type 1 bolts are made as medium steel with sufficient harden ability to obtain the required properties. The Type 3 bolts are made from composition "A" from Table 2 in the ASTM A325 specification (medium carbon steel with Copper, Nickel, and Chromium additions for weathering purposes). Dimensions are a specified for Heavy Hex Structural Bolts in ANSI/ASME B18.2.6 and threads are UNC (Unified Coarse) per ANSI/ASME B1.1. 


ASTM A325M bolts are supplied as plain or galvanized (mechanical or hot dipped). The chemical and mechanical properties are given in ASTM F568 ("Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners"). The ASTM A325M bolt is equivalent to the properties of an ASTM F568 class 8.8 bolt. These properties are essentially identical to class 8.8 in ISO 898/I. Surface discontinuity limits are specified in ASTM F788/F788M. The ASTM A325M bolts are produced to the dimensions for heavy hex structural bolts as specified in ANSI B18.2.3.7M. The threads are rolled as specified in ANSI B1.13M, to a metric coarse thread with grade 6g tolerance.


ASTM A490 bolts are supplied as plain (black) only. These bolts are heat treated to a tensile strength range of greater than 150 ksi. Medium carbon, alloy steel is used for these bolts. Dimensions are as specified for Heavy Hex Structural Bolts in ANS/ASME B1.1.

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To order standard fasteners, contact a sales representative

Repeat customers may fax your orders to (336) 852-9730.

Fax orders for Standard fasteners to 336-852-9730 or email

Call Atlantic Fasteners toll free at 1-800-233-6932

Atlantic Fasteners, Inc
PO BOX 19066
Greensboro, NC 27419-9066
(336) 852-0700 or (800) 233-6932 Fax: (336) 852-9730