ASTM A325 Hex Head Screws
ASTM A325 Hex Head Screws (also called A325 Hex Bolt/ ASTM A325 Structural Bolt/ High-Strength Hex Head Cap Screw/ A325 Heavy Hex Bolt/ ASTM A325 Hexagonal Head Bolt/ Structural High-Strength Hex Screw(A325)/ High Strength Hex Head Screw) are high-strength structural fasteners widely used in steel-to-steel and steel-to-wood connections. Designed for heavy-duty applications, they are indexed extensively by Google under various industry terms and remain a staple in construction and engineering.
Thread sizes: 1/2" to 1-1/2" (metric equivalents available)
Thread type: UNC (coarse) or 8-thread series for sizes >=1"
Materials: Medium-carbon steel (quenched and tempered)
Mechanical properties: Minimum tensile strength of 120 ksi (827 MPa) for 1/2" to 1" sizes; 105 ksi (724 MPa) for 1-1/8" to 1-1/2" sizes
ASTM A325 is equivalent to F1852 (a newer standard for tension control bolts) in performance but differs in installation method.
Not directly comparable to metric grades, but its strength approximates ISO 8.8 and 10.9 classes in specific applications.
Type 1: Carbon steel (most common)
Type 3: Weathering steel (for corrosion resistance in outdoor applications)
ASTM A325 Hex Head Screws are primarily used in structural applications requiring high clamping force:
- Wood-to-steel connections in commercial buildings
The ASTM A325 Hex Head Screw is a high-strength, heavy-duty fastener designed for structural steel connections. With its standardized properties, different grades (Type 1 & Type 3), and multiple finishes, it remains one of the most reliable fasteners for construction and engineering projects worldwide. ASTM A325 Hex Head Screws are critical components in structural engineering, valued for their high strength and reliability.
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