Thread Rod GR B7

 Product Introduction

• Standard Name: Threaded Rod or Stud Bolt.

• Common Names: Full-Thread Stud, Double-Ended Stud, Threaded Rod.

• Product Definition: A fastener with threads machined along its entire shaft, designed for use with nuts at both ends. Commonly employed in applications requiring through-hole connections or length adjustment. GR B7 specifically denotes compliance with ASTM A193 standard's B7 material and performance grade, representing a specialized alloy steel material for high-temperature and high-pressure applications.

Thread Rod GR B7 Key Features

• Material: Chromium-molybdenum alloy steel (typically 4140 steel), heat-treated by quenching and

  tempering for high strength and high-temperature resistance.

• Mechanical Properties: Minimum tensile strength 125 ksi (860 MPa), yield strength 105 ksi (725 MPa),

  elongation 16%, maximum hardness 35 HRC.

• Fully Threaded Design: Uniform thread throughout the rod, facilitating easy cutting and nut fitting,

  and flexible length adjustment.

• Various Sizes: Diameter 1/4"-4" (M6-M100), length 1-12 feet or custom, supports coarse and fine threads.

• Surface Finishes: Common solid colors, zinc plating, hot-dip galvanizing, or coatings, providing different

  corrosion resistance levels.

Working Principle

• Cutting and Fitting: Cut to the required length, fitted with heavy-duty nuts (e.g., A194 2H) and washers

  at both ends.

• Preload Generation: When tightening the nut, the thread generates a strong axial clamping force,

  securing the flange or component.

• Load Transfer: The entire thread evenly distributes tensile, shear, and high-temperature stresses;

  heat treatment ensures fatigue resistance.

• High-Temperature Stability: Chromium-molybdenum alloy resists high-temperature creep; the principle

  involves friction interlocking and material strengthening.

Product Applications

• Oil and Gas: Flange connections, pressure vessels, valves, and pipe bolting.

• Power and Chemical Industries: Boiler, steam pipe, or reactor mounting, resistant to high temperatures

  and pressures.

• Machinery Manufacturing: Heavy equipment bases or structural frames, providing high tensile strength.

• Civil Engineering: Steel structure bolting or foundation anchoring, often with 2H nuts.

• General Industry: Any project requiring high-strength alloy steel threaded rods.