A torque multiplier is a precision gearbox that multiplies the torque you apply by hand — letting one person reach several thousand Newton-metres safely, without an impact wrench. When a fastener spec exceeds the practical hand limit of a torque wrench (roughly 1,000 Nm), a multiplier is how you reach it accurately and repeatably.
How a Torque Multiplier Works
Inside is a planetary gear train with a fixed ratio — for example 5:1 or 25:1. A reaction arm braces against an adjacent surface to absorb the output reaction force. At a 25:1 ratio, an input of 120 Nm on the wrench becomes 3,000 Nm at the output, with a controlled, repeatable result that an impact wrench cannot match.
When You Need One
Reach for a torque multiplier on large structural and flange bolts, heavy machinery, wind, rail, and energy equipment, and any joint specified above the comfortable range of a hand torque wrench. They deliver high torque quietly and accurately, which matters where bolt preload must be controlled.
Choosing the Right Multiplier
Match three things: the ratio needed to reach your target torque from a comfortable input, the stated accuracy (better multipliers hold tight tolerances), and a reaction arm suited to your joint geometry. Like torque wrenches, multipliers should be calibrated to ISO 6789 on a regular cycle.
Phil Industries’ Take: Torque Multiplier Applications We See in Singapore
Phil Industries supplies Mountz torque multipliers to Singapore shipyards, petrochemical plants in Jurong Island, and heavy industrial maintenance teams across the island. The application we see most often is flange bolt torquing on pressure vessels and piping — environments where fasteners are specified at 800–2,500 Nm and hand torquing is physically impossible. In these contexts, the gear ratio accuracy of the multiplier matters as much as the output torque value, since under-torqued flanges are a process safety risk.
A question we frequently get is whether torque multipliers require their own calibration certificate. The answer is yes — the multiplier introduces its own gear ratio tolerance (typically ±4%), so the output torque must be verified independently. We can arrange calibration of the complete torque wrench-plus-multiplier assembly at our Ubi facility.
For Singapore enquiries on Mountz torque multipliers, reaction arms, and accessories, contact Phil Industries at +65 6555 1745 or email kenneth@phil-industries.com.sg.
Frequently Asked Questions
What is a torque multiplier?
A geared tool that multiplies hand-applied torque by a fixed ratio (such as 5:1 or 25:1), using a reaction arm to absorb the output force, so one operator can reach very high torque accurately.
How much torque can a multiplier reach?
Several thousand Newton-metres. For example, a 25:1 multiplier turns a 120 Nm input into 3,000 Nm output — well beyond a hand torque wrench.
Do torque multipliers need calibration?
Yes. Like torque wrenches, they should be calibrated to ISO 6789 on a regular interval to keep their output accurate and traceable.
Reach High Torque Accurately
Phil Industries supplies Mountz torque multipliers in Singapore, with calibration handled locally. Tell us your target torque and joint and we will specify the ratio and reaction arm. Call +65 6555 1745 or request a quote.
