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Manual Torque Multipliers

Norbar gearboxes are built to an extremely high standard of precision. All gears rotate on needle roller bearings about hardened and ground journal pins. As a result, Norbar HandTorques can be relied upon to have a torque multiplication accuracy of +/-4%, throughout the operating range, taking the uncertainty out of high torque tightening.

No gearbox is 100% efficient and so the velocity ratio (the number of turns that the input has to make to achieve one revolution of the output) is not the same as the torque multiplication ratio. Norbar multipliers are engineered such that each gear stage has a velocity ratio of typically 5.45:1 which results in a true torque multiplication factor of 5:1.

Torque output calculations are therefore a matter of simple arithmetic with little risk of incorrect bolt loading due to conversion errors. Other manufacturer's multipliers often require graphs or formulae to calculate the input torque to achieve a particular output.

The Norbar HandTorque is the most comprehensive multiplier range available. Standard products are available up to 47,500 N·m (35,000 lbf·ft) and 'specials' to 300,000 N·m (220,000 lbf·ft). A range of 'nose extensions' for reaching difficult to access bolts and full range of torque transducers for highly accurate torque monitoring are available.

HT3

HandTorque HT3 Multipliers are tough, versatile and well priced multiplier kits, up to 2700 N·m.

They have true 5:1 multiplication and are supplied with two reaction styles for maximum versatility. Ideal for heavy vehicle tool kits.

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HT4

The robust construction of the HT4 means minimal maintenance and long life, providing torques up to 4500 N·m.

High ratios allow the use of a small torque wrench.  Accuracy guaranteed better than ±4%, each tool is supplied in a carry case with a replacement square drive.

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Compact Series

The compact dimensions of this range allows excellent access and easy, safe handling with a guaranteed accuracy of better than +/-4%, up to 7000 N·m.

All Compact Series multipliers are supplied with a calibration certificate.

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Small Diameter Series

The HandTorque HT30 and HT60's reduced diameter enables better access, particularly on pipe flanges, for torques up to 6000 N·m.

The reaction foot can slide on the high strength spline to allow for sockets of various length.

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Standard Series

The Standard Series of HandTorque multipliers have a guaranteed accuracy of +/-4%, and electronic torque transducers can be fitted for precise torque monitoring.

Models available up to 300,000 N·m and other reaction styles can be designed to suit specific applications.

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Use Our Calculators

Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas:

  1. Unit conversion to assist international measurement definitions.
  2. Torque extension for setting correct values
  3. Torque tension to identify precise levels of torque to be applied for individual applications.
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Norbar Torque Tools Inc. 36400 Biltmore Place, Willoughby, Ohio 44094, USA