STU Bolt Tensioner – Metric

Description

STU Series Subsea Bolt Tensioners – Engineered for Harsh Underwater Environments

The STU series subsea bolt tensioners are specifically designed to meet the rigorous demands of divers working in challenging underwater conditions. Built for reliability and ease of use, the STU series features a robust two-piece system: a quick-fit/release threaded puller and a hydraulic load cell with an integrated bridge.

With an extended 30 mm piston stroke, these tensioners significantly reduce the need for frequent resets, increasing productivity and safety during underwater bolting operations.

Key Features:

• Tensioning capacities ranging from 256 to 2482 kN

• Suitable for bolt sizes from M24 to M90 diameter

• Working pressure up to 1500 bar

• Single-acting hydraulic design with manual piston retraction

• Constructed from high-grade alloy steel for superior durability

• Simple two-piece design ideal for diver-friendly operation

• Visible stroke indicator ensures safe and accurate tensioning

• Dual quick-connect couplings for efficient subsea connection

• Compatible with most ANSI, API, and some Compact flanges

Modular & Interchangeable Design:

Each hydraulic load cell is compatible with multiple thread sizes, and interchangeable quick-fit pullers can be purchased separately. This allows for:

• Greater flexibility in bolt size accommodation

• Cost savings by eliminating the need for multiple full tensioner sets

• Easy maintenance and reusability across various subsea applications

Applications:

Ideal for tensioning subsea flanges, pipeline joints, pressure vessels, and other bolted connections where safety, speed, and precision are critical.

Custom Solutions Available:

Specially designed subsea tensioners are available on request for non-standard applications or unique operational requirements.