In an industry where time is of the utmost importance, maintenance and training when and where you need it can make all the difference. We can reduce your downtime by performing bolting calibration and maintenance on the job-site, in our Bolting Van. The laboratory quality equipment in our Bolting Van is ISO 17025 accredited and powered by Norbar.

We offer on-site services for all brands, nationwide, including:

  • Repair
  • Calibration
  • Testing
  • Demonstration
  • Training
  • Certification
  • Setup
  • Troubleshooting & Assistance


  • Repair and Testing
  • Calibration and Certification
  • Demonstration, Training and Setup
  • Troubleshooting and Assistance


  • Hydraulic Torque Wrenches
    (Square Drives and Cassettes)
  • Pneumatic and Electric Torque Wrenches
  • Manual Torque Wrenches


  • Controlled Bolting
  • Tool Specific Training
  • Solutions and Recommendations for Your Application


In the bolting world, calibration measures the accuracy and quality of torque produced by bolting equipment. While we recommend regularly calibrating all tools, calibration is especially critical for torque wrenches. With complex moving parts and constant exposure to harsh environments, torque wrenches tend to naturally drift out of calibration. This causes bolting equipment to produce less accurate or inconsistent results.

The need to calibrate is based on tool-specific ISO standards, which state how many cycles can be performed before equipment requires service. As a general rule, the more often a tool is used, the more often it will need calibration to ensure safe and accurate operation. In the very least, ISO standard 17025 recommends calibrating torque wrenches every 5,000th cycle or once per year.


During a torque tool calibration, our technician will compare your equipment to a calibrated tool. This comparison allows the technician to check if the level of torque produced by your equipment matches the amount produced by the calibrated tool.

If the amount of torque applied by your equipment does not match the amount applied by the calibrated tool, your equipment will be adjusted to meet the standard. Upon completion, the amount of torque you set your equipment to apply will actually be the amount of torque produced by the tool during use.

John Gibbs

Bolting Repair Technician

Detroit Headquarters


Contact our Bolting Repair Technician, John Gibbs, to setup an appointment
at your job-site.

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