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Free torque wrench calibration record template

A free Excel record for checking click torque wrenches in-house against the ISO 6789-1 limits. Enter five analyzer readings at the lowest marked value, 60% and 100% of maximum. The sheet works out each deviation, passes or fails each reading and sets the next due date.

Download the Excel template .xlsx, 14 KB, 3 sheets

What's inside the workbook

Instructions

How to set the tolerance, take the readings and read the result, plus the interval and analyzer rules from ISO 6789.

Blank record

Yellow cells for the wrench, its range and tolerance, the analyzer and the date. The As found and As left tables take five readings at each of three test points.

Filled example

A 20 to 100 N·m Type II Class A click wrench. One reading at 100 N·m is +4.10%, so it fails as found. After adjustment every reading passes.

How to check a torque wrench

  1. Fill in the wrench details, its lowest marked value and maximum torque, the tolerance and the analyzer you are using.
  2. Set the wrench to the lowest marked value and release it five times on the analyzer. Enter each reading.
  3. Repeat at 60% and 100% of maximum. The set values fill in from the range you entered.
  4. Each reading is checked against the tolerance on its own. One reading outside it fails the wrench.
  5. If it fails and you adjust it, repeat all three points in the As left table. The status uses the As left result.

Tolerances in ISO 6789-1:2017

The maximum permissible deviation depends on the wrench type and class, and on whether its maximum torque is above 10 N·m. Use the maker's figure if it is tighter.

  • Type II (setting) Classes A, B and C: ±4% above 10 N·m maximum, ±6% at or below 10 N·m.
  • Type II Classes D, E, F and G: ±6%.
  • Type I (indicating) Classes A and D: ±6%.
  • Type I Classes B, C and E: ±4% above 10 N·m maximum, ±6% at or below 10 N·m.

How often to calibrate a torque wrench

Without a procedure of your own, ISO 6789-2:2017 clause 4.1 gives 12 months or 5,000 cycles, whichever comes first, counted from first use. Check sooner after an overload above 125% of maximum, a repair, a drop or other mishandling. A wrench in heavy use reaches 5,000 cycles long before a year is up, so set the interval from your own results once you have them.

Which formula the record uses

ISO 6789-1 works out the deviation as (analyzer reading - set value) / set value x 100. ISO 6789-2 divides by the analyzer reading instead and reverses the sign. The same reading can pass one and fail the other: 104.10 N·m at a 100 N·m setting is +4.10% under Part 1, outside ±4%, but -3.94% under Part 2. The ±4% and ±6% limits come from Part 1, so the record uses Part 1.

The torque analyzer

Use an analyzer whose error is no more than a quarter of the wrench tolerance, so ±1% for a ±4% wrench, with a current calibration certificate. Without a procedure of your own, ISO 6789-2 allows up to 24 months between analyzer calibrations.

What this record is not

It is an in-house check against the ISO 6789-1 limits. An ISO 6789-2 calibration certificate also states the measurement uncertainty at each test point and comes from a calibration lab, often one accredited to ISO/IEC 17025.

Common questions

  • How often should a torque wrench be calibrated?

    ISO 6789-2 gives 12 months or 5,000 cycles, whichever comes first, when you have no procedure of your own, and sooner after an overload, a repair or a drop. Many shops then adjust the interval from their own results.

  • What is the tolerance for a click torque wrench?

    Under ISO 6789-1:2017, a Type II Class A click wrench with a maximum above 10 N·m may deviate up to ±4% at each test point, and ±6% at or below 10 N·m. Every single reading must be inside that limit.

  • Can we check our torque wrenches in-house?

    Yes, with a torque analyzer that is accurate to a quarter of the wrench tolerance and calibrated itself. This record is for that check. A customer or auditor who needs a stated measurement uncertainty will ask for an ISO 6789-2 certificate from a lab.

  • What is the difference between ISO 6789-1 and ISO 6789-2?

    Part 1 sets the requirements and the conformance test, including the ±4% and ±6% limits. Part 2 covers calibration and the measurement uncertainty a calibration certificate states. Both are 2017 editions.

  • Is the template free?

    Yes. Download it without an email address. If you want reminders and every wrench's history in one place, Axiospec is free for up to 50 instruments.

The record helps you check a torque wrench against the ISO 6789-1 limits. It does not replace the standard, the maker's instructions or a calibration certificate.

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