Setting the Torque Limit of X4 Torque Limiters

Home Setting Torque Limit

Setting the Torque Limit

  • Attach a calibrated torque measuring device to the output drive square (1) of the torque limiter and, while holding the body (5) stationary, determine the torque required to force the mechanism to release.
  • If the measured torque is not within the desired range, remove the snap ring (2) and locking plate (3).
  • Adjust the nut (4) with an open-end wrench; clockwise to increase the torque setting, counter-clockwise to decrease the setting.
  • Re-measure the breakaway torque and repeat the preceding step until the desired setting is achieved.
  • Replace the locking plate fitting it into the notches of the limiter body and install the snap ring. If the locking plate does not fully seat within the assembly it will be necessary to rotate the nut slightly either clockwise or counter-clockwise to align the notches of the plate and the body until the plate falls into place. The direction in which to rotate the nut is determined by whether a slightly higher or slightly lower breakaway torque is desired.

Statement of Performance Expectation

  • The desired torque limit can be preset either by the user or X-4 Tool.
  • The design of the locking plate does not allow for infinite adjustment since a limited number of locking points are possible. Check the tool for the closest point to the desired release point. If the locking plate will not "seat" in the tool, turn the adjusting nut either slightly clockwise (thereby increasing the torque setting at which the limiter will release) or counter-clockwise (decreasing torque release). The direction of that small adjustment is best determined by whether a minimum torque or maximum toque is desired.
  • The standard X-4 Perf-A-Torq™ Torque Limiter is designed to be used as a torque limiter in either the clockwise or the counterclockwise direction. One-way torque limiters are available that release in one direction and lock in the other.
  • When the torque release setting is established in either direction, clockwise or counterclockwise, the user may expect repeatability from release-to-release with ±5 percent of setting. Generally, however, as you approach the midrange or higher of any particular model, the repeatability percentage from release-to-release will improve. In models 38A, 38B, 12A and 12B there are 12 releases in 360 degrees (every 30 degrees). In model 12D there are 18 releases (every 20 degrees) and in model 12E there are 24 releases (every 15 degrees).

Phone: 781-933-1400

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