ASTM A325 Threaded Rods

ASTM A325 Threaded Rods are continuous, full-length threaded bars manufactured using material that meets the high-strength requirements of the A325 structural specification. Though A325 is primarily a hex bolt standard, the material grade is frequently applied to these rods to serve as high-strength anchor bolts, foundation bolts, or tie rods. They are made from medium carbon steel that is quenched and tempered, achieving the high tensile and yield strength necessary for critical structural connections. When assembled with matching A325-compatible nuts and washers, these rods are vital for heavy-duty anchoring in bridges, large buildings, and machinery installations where substantial loads must be safely secured.

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ASTM A325 Threaded Rods

ASTM A325 Type 1 Bolting Chemical Composition

Element Content (%)
Carbon (C) 0.30 – 0.52
Manganese (Mn) 0.60 min
Phosphorus (P) 0.035 max
Sulfur (S) 0.045 max
Silicon (Si) 0.10 min
Boron (B) Optional

ASTM A325 Threaded Rods Mechanical Properties

Property 1/2" to 1" Diameter (min) 1-1/8" to 1-1/2" Diameter (min)
Tensile Strength 120 ksi (827 MPa) 105 ksi (724 MPa)
Yield Strength (0.2% Offset) 92 ksi (634 MPa) 81 ksi (558 MPa)
Elongation in 4D 14% 14%
Hardness (Brinell max) 319 HB 319 HB

ASTM A325 Threaded Rods Feature Products