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Structural Fasteners

A325 & A490 Steel Fasteners For Industrial Applications

Structural fasteners feature strong, heavy duty materials to affix steel objects together and form steel to steel connections. Fastco Inc. is fully stocked on a complete inventory of A325 and A490 standard structural fasteners. We offer stainless steel bolts, nuts and washers as well as Tension Control bolts and Load Indicating Washers for most industrial applications. All supplied structural fasteners can be plain or hot dip galvanized. Domestic and Import fasteners are all 100% lot controlled with corresponding material test reports. As a leading fastener distributor for over 50 years, we are confident that we can source lock nuts to meet your application requirements. We offer free shipping on all lock nut orders in the US.

Learn more about our structural fasteners below, contact our knowledgeable and experienced Fastco Inc. sales staff or call us at 253-383-1767 for an immediate response.

Structural Fastener Product Offering

Structural Bolts

Structural bolts offer a larger, thicker design than standard bolts. Our A325 Heavy Hex Bolts are intended for structural bolting uses. ASTM A325 heavy hex bolt dimensions range from ½ to 1½ inches in diameter. Bolts have a Minimum tensile strength of 105-120 tensile ksi and are popular in construction and structural bolting projects.


Heavy hex nuts utilize a larger size, thicker profile and are typically made from high-grade steel. They are used in conjunction with heavy bolts. These nuts secure bolts in structural joints and distribute the load over a large area. Grade options in multiple diameters include:
  • A194
  • A563
  • 2H
  • DH
  • Grade

A325 Structural Steel Washers

These structural washers are often used as spacers and load distributors for construction and exterior building applications. Designed for use with A325 structural bolts, studs, and nuts.

Featured Structural Fastener Products

Tension Control Bolts

Tension control bolts are easy to install and feature a rounded head and splined end that shears off when the nut achieves proper torque. Our tension control bolts are manufactured with A325 stainless steel.

Load Indicating Washers

DTI washers are designed for use on a hex assembly to ensure sufficient tension on bolts. DTI washers can save time in construction applications because it is easier to confirm when tension or torque is achieved. These load cell washers are highly accurate and prevent potential disasters resulting from an under-tensioned bolt.

Structural Fastener Industrial Applications

Our hot-dipped galvanized finish option adds corrosion resistance and durability for use in demanding environments. Some frequent industrial applications include but are not limited to:

Not Seeing What You Need?

Please contact our knowledgeable and experienced Fastco Inc. sales staff, or call us at 253-383-1767 for an immediate response.

Need This Customized?

Fastco Inc. offers custom threading, cutting and bending services to meet your project needs.

Add-On Services