A325 / A490 Structural Heavy Hex Bolts – Heavy hex bolt with flat and washer faced bearing surface and chamfered point. Ideal for applications for structural steel joints in heavy construction. Heavy hex bolt with flat and washer faced bearing surface and chamfered point.
Material: Available in alloy steel, ASTM A325/A490.
Size range: From 1/2″ to 2″ diameter to custom
Finishes: plain, zinc-plated, or galvanized
Options: TC (Tension Control) Bolts : “Twist-off” Bolts
Thread: American Standard, Metric, Custom and Specialty
Heavy hex bolts have a head that is larger than a standard (finish) hex head. Standard heavy hex structural bolts are made of low to mid carbon steel. The large head offers a greater bearing surface that distributes the clamping load over a greater area.
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4″ through 4″ diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar. There are three grades A, B, and C which denote tensile strength, configuration, and application.
The ASTM A193 standard covers alloy steel and stainless steel bolting materials for high temperature or high pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in UNC national coarse thread, diameters above one inch are typically specified 8 threads per inch (tpi).
ADDITIONAL SPECIFICATION
HEAVY HEX BOLTS
TORQUE VALUES FOR A307B HEAVY HEX BOLTS
TORQUE VALUES FOR A325 HEAVY HEX BOLTS
TORQUE VALUES FOR A490 HEAVY HEX BOLTS
TORQUE VALUES FOR A193 B7 HEAVY HEX BOLTS
HEAVY HEX BOLTS – MECHANICAL PROPERTIES
Heavy Hex Bolt Specifications
General heavy hex bolts include ASTM A307 specifications, which covers carbon steel bolts and studs ranging from 1/4” through 4” in diameter. This is the most common heavy hex bolt and includes Grades A, B, and C which denote tensile strength, configuration, and its intended use. ASTM A490M Bolt Nut Washer
The ASTM A193 specification covers alloy steel and stainless steel bolt materials for high temperature and high pressure applications.
Heavy hex structural bolts are designed for steel-to-steel connections and include ASTM A325 and A490 specifications, which covers bolts from 1/2” up to 1-1/2” in diameter. Since these heavy hex bolts are intended for structural connections, they have shorter thread lengths than standard hex bolts.
As a national distributor of heavy hex bolts, WINDO Fasteners carries a huge selection of bolt sizes, lengths, materials and finishes, however if you need any assistance fining the heavy hex bolt you need for your application, please contact us today. Our knowledgeable staff is here to help!
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