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ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength. It defines mechanical properties for bolts that range from 1 ⁄ 2 to 1 + 1 ⁄ 2 inches (13 to 38 mm) in diameter.
This image is a derivative work of the following images: Hex cap screw--001.svg licensed with Cc-by-sa-3.0, GFDL . 2008-11-15T00:21:58Z Three-quarter-ten 102x89 (737 Bytes) {{Information |Description={{en|1=An icon to represent hex-head (i.e., external hex) cap screw.}} |Source=Own work by uploader |Author=[[User:Three-quarter-ten|Three-quarter-ten]] |Date=2008-11-14 |Permission= |other_versions
This image is a derivative work of the following images: File:Hex_cap_screw--001.svg licensed with Cc-by-sa-3.0, GFDL . 2008-11-15T00:21:58Z Three-quarter-ten 102x89 (737 Bytes) {{Information |Description={{en|1=An icon to represent hex-head (i.e., external hex) cap screw.}} |Source=Own work by uploader |Author=[[User:Three-quarter-ten|Three-quarter-ten]] |Date=2008-11-14 |Permission= |other ...
At that time, high-strength structural steel rivets were common in buildings and bridges, but bolts were expected to be safer, quicker, and more economical if technical equivalence could be demonstrated. The council's first Specification [3] identified ASTM A325 bolts as one-to-one replacements for ASTM A141 rivets. [4]
The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...
ASTM A325, standard for bolts 1 ⁄ 2 to 1 + 1 ⁄ 2 inches (12.7 to 38.1 mm) in diameter; ISO 898, standard for metric bolts; Mechanical joint; Screw thread; Socket wrench; Thread angle; Thread-locking compound; Thread pitch gauge; Torque wrench