A missing torque wrench costs you the price of a torque wrench. A torque wrench that is past its calibration date and still tightening wheel nuts, flange bolts or scaffold couplers costs you rework, failed inspections and awkward conversations with customers. That is what separates torque wrenches from the rest of the tool register: you are not just tracking where the wrench is, you are tracking whether it can be trusted.
What you will learn
- Why a torque wrench is not an ordinary tool
- The register: what to record per wrench
- Labelling a calibrated instrument
- Check-outs and the custody trail
- Running the calibration cycle
- Tools that make this easier
- FAQ
Why a torque wrench is not an ordinary tool
A torque wrench is a measuring instrument that happens to look like a spanner, and it loses accuracy in ways nobody notices:
- Drops and knocks. A fall from a bench can shift the mechanism without leaving a mark.
- Misuse. Breaking seized fasteners loose, or torquing past the top of the range, stresses the internals.
- Storage under tension. A click-type wrench left wound up to its working setting between jobs drifts faster than one wound down.
- Time. Even a babied wrench needs periodic recalibration to stay inside tolerance.
The consequence is unusual too. If a wrench is found out of tolerance at its next calibration, every joint it tightened since the last good check is suspect. Without a record of who held the wrench and when, you cannot scope the problem - which is why quality systems care so much about an unbroken chain of custody for calibrated tools.
The register: what to record per wrench
The register has to answer two questions at any moment: where is this wrench, and is it in calibration. That means a few fields beyond a normal tool record:
| Field | Why it matters |
|---|---|
| Asset ID | The number on the label - what people quote and what the log hangs off |
| Make, model, drive size, range | ”The 1/2-inch 40-200 Nm one” is not a unique identifier when you own six |
| Serial number | Ties your record to the lab’s calibration certificate |
| Last calibration date + certificate number | The evidence an auditor asks for first |
| Calibration due date | The single field that keeps an expired wrench off the job |
| Purchase date + price | Repair-or-replace decisions, and insurance if a kit goes missing |
| Status | In service, out for calibration, quarantined after a drop, retired |
| Current holder | Who to ask, and who held it if a check later fails |
Attach the calibration certificates to the record as documents. A certificate that lives in an email thread from the lab is a certificate you will not find during an audit.
Labelling a calibrated instrument
Most torque wrenches arrive back from the lab with a calibration sticker showing the test date. Useful, but it is not an identity - stickers from the lab are small, generic and fall off. Add your own permanent label:
- Put a durable QR label on the body or shaft, away from the scale window and the grip adjuster, where it will not be worn by hands or obscure a reading.
- Label the case as well. Wrenches that live in blow-moulded cases get identified by the case nine times out of ten, and a labelled case makes the “whose is this?” moment instant.
- Choose laminated or polyester stock. A torque wrench lives in toolboxes and van drawers; paper labels do not.
Scanning the label should surface the calibration due date before the wrench gets used - that is the whole point of putting the identity on the tool rather than in a folder.
Check-outs and the custody trail
Run torque wrenches on a strict sign-out model: each wrench is either in the crib or checked out to exactly one named person. A paper equipment sign-out sheet can do this; the important part is that issue and return are recorded as events with dates, not as a name pencilled in a margin.
On return, capture condition - and specifically ask about drops. A fitter will mention a drop at hand-back if there is a box to tick; they will not drive back to the yard to report it otherwise.
Tip: treat the calibration due date as a hard gate, not a note. The day a wrench expires, change its status and pull it from the board - a wrench that is in the rack gets used, whatever the spreadsheet says.
Running the calibration cycle
The cycle itself is simple; staying ahead of it is the work:
- Plan by due date, not panic. Review what falls due next month and book it in, so wrenches go to the lab in ones and twos instead of all at once.
- Stagger the fleet. If every wrench was calibrated the same week, every wrench expires the same week. Spread the dates so the job always has covered wrenches available.
- Quarantine expired and dropped wrenches. A separate status and a separate shelf. Mixing them with serviceable stock is how out-of-tolerance work happens.
- Log the result, not just the trip. Date, lab, pass or adjust, certificate, new due date - all on the wrench’s record, so the calibration log builds itself.
Tools that make this easier
A spreadsheet can hold all of these columns, and plenty of workshops run one. It fails in two places: the due dates only work if someone remembers to look at the sheet, and the certificates end up scattered across inboxes and shared drives where the auditor cannot follow them.
AMPthilly keeps the whole thing on the asset. Each wrench gets a profile with serial, purchase details and custom fields for the calibration due date and certificate number; certificates attach to the record as documents; check-outs and returns are logged events, so the custody trail and the calibration log build themselves; and the printable QR label opens the wrench’s record in any phone browser, so a fitter can confirm the due date at the bench. The free plan covers 3 users and 25 assets - enough for most workshops’ calibrated tool set. See pricing for what the paid tiers add.
FAQ
How often should a torque wrench be calibrated? Per the manufacturer’s interval or your quality system - typically a fixed period or a cycle count, whichever comes first - and sooner after heavy use or any drop. The register’s job is knowing which wrench is due when.
What should a torque wrench register include? Asset ID, make/model/range, serial, purchase details, last calibration date, certificate number, due date, status, and current holder - with certificates attached to the record.
How do I keep a torque wrench calibration log? Log each calibration as an event on the wrench: date, lab, result, certificate, new due date. The history of one wrench on one page is what audits ask for.
Should torque wrenches be signed out to individuals? Yes - one named holder at a time. If a wrench is later found out of tolerance, the custody trail is how you scope which work is suspect.
What should happen when a torque wrench is dropped? Quarantine it, log the incident against the asset, and send it for a check before it tightens anything else.
The takeaway
Torque wrench tracking is custody plus calibration. Give every wrench a permanent identity, record calibrations as events with the certificate attached, sign wrenches out to named people, and gate use on the due date. Do that and the question is never “is this wrench in cal?” - the label answers it before the first fastener.