Hydraulic Through Bolt (Hydraulic Tensioning Bolt / Threaded Hydraulic Stud)

1. Product Overview
The Hydraulic Through Bolt is a high-precision fastening solution designed for applications requiring consistent, repeatable, and accurate bolt preload. Unlike traditional torque tightening methods, this through-bolt utilizes hydraulic tensioning to achieve exact clamp loads, eliminating the friction variables commonly associated with torque wrenches.

2. Key Features

• Through-Hole Design: The axial through-hole allows for direct connection to a hydraulic tensioning tool, enabling simultaneous stretching of the bolt and easy nut rundown.

• High Preload Accuracy: Achieves ±5% or better preload accuracy, significantly reducing scatter compared to torque methods.

• Friction-Free Tensioning: Hydraulic force is applied directly to the bolt shank, bypassing thread friction and under-head friction for superior joint integrity.

• Durable Material: Manufactured from high-strength alloy steel (e.g., 42CrMo4 / AISI 4140) with optional surface treatments (zinc plating, Dacromet, Xylan, or PTFE coating).

• Customizable Threads: Available in metric (M series), inch (UNC/UNF), or custom thread forms to match specific flange or joint requirements.

3. Applications

• Wind turbine tower flange connections

• High-pressure pipeline and valve fastening

• Hydraulic press and heavy machinery assembly

• Offshore and marine bolted joints

• Bridge and structural engineering pre-stressing

4. Technical Specifications (Typical)