---
publication_id: "OT-2026-000002903"
title: "Hydraulic torque wrench"
published_at: "2026-09-15T19:16:03.928844Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000002903"
categories:
  - "tools-tooling/clamping-tools"
keywords:
  - "b25b21/005"
  - "b25b21/005"
  - "b25b23/145"
  - "b25b23/145"
  - "b25b23/145"
  - "b25b21/00"
---

# Hydraulic torque wrench

## Abstract

A hydraulic torque wrench ( 10 ), comprising: an input, for pressurised hydraulic fluid; a drive connector ( 14 ); a drive connector ( 13 ), driven by hydraulic fluid introduced at the input and arranged to drive the drive connector ( 14 ) to rotate; a drive member ( 1 ) for connecting to an item to be rotated by the hydraulic torque wrench ( 10 ), the drive member ( 1 ) comprising: a drive member ( 16 ), which engages the drive connector ( 14 ) so as to be driven by the drive connector ( 14 ) and a second part ( 18 ) arranged to be coupled to the item to be rotated. In which the drive member ( 1 ) comprises a retention mechanism which has two states: a first state, in which it prevents removal of the drive member ( 1 ) from the drive connector ( 14 ); and, a second, state in which it permits removal of the drive member ( 1 ) from the drive connector ( 14 ). In which the retention mechanism remains connected to the drive member ( 1 ) in the first state and in the second state. In which the retention mechanism comprises at least one retractable pin in the drive member ( 1 ), the retractable pin extending from the drive member ( 1 ) into the drive connector ( 14 ) in the first state and retracting into the drive member ( 1 ) in the second state. In which the drive member ( 16 ) of the drive member ( 1 ) has splines ( 15 ), and the drive connector ( 14 ) has splines ( 15 ) complementary to those of the drive member ( 16 ) of the drive member ( 1 ). In which each pin protrudes from the splines ( 15 ) of the drive member ( 1 ). There is no need to remove a separate retention member to change the drive member ( 16 ).