Tool Crib: What It Is, How Checkout Works and How to Manage It

What is a tool crib?

A tool crib is the one place a plant, shop or contractor keeps its shared tools. It is often a caged room or a counter with a service window. A tool goes out only against a name, and comes back to the same shelf. So at any moment the crib can say what is on the shelf and who has the rest.

A crib holds durables and consumables, and they follow different rules. Durables, such as torque wrenches, drills and gauges, go out on loan and must come back. Consumables, such as drill bits, carbide inserts and gloves, are issued by quantity against a job and never return. Logged as loans, they would fill the overdue list with items nobody was meant to bring back.

A tool crib is not quite a toolroom. Wikipedia's toolroom entry notes that the word first meant a room where tools are stored, which is a tool crib. In a factory it now usually means the shop where tools, jigs and fixtures are made and repaired. So the crib stores and issues tools, while the toolroom makes and mends them.

How a tool checkout system works

A tool checkout system writes one row each time a tool crosses the counter. The row says who took the tool, which tool, for which job, when, and when it is due back. A return is a new row that closes the loan. Every report the crib runs, from overdue loans to shrinkage, starts from those rows.

Cribs differ in who writes the row. At an attended window, the tool crib attendant scans the badge and the tool, and can refuse a loan. A vending machine or a locker bank writes the row when the badge reads. On open shelves the borrower writes it, if they remember.

A plant with more than one shift can split the work. Gauges and costly tools stay behind the attended window. Vending machines or lockers cover consumables and common hand tools around the clock. If a locker cannot refuse a gauge past its calibration date, keep gauges at the window.

What to record at checkout and return

At checkout, record who took which tool, for which job, when, when it is due and its condition. At return, record the loan it closes and the condition again. A small team with a few shared tools and one person handing them out can get by on a simpler equipment sign out sheet. A crib that serves several shifts, charges jobs and holds gauges needs every field below.

• Every row: an ID, the type, the time, the item, the quantity, the badge and the terminal. The type is loan, return, issue, send-out, transfer, write-off or unfilled, and most reports filter on it. A transfer moves an open loan to another badge when a tool changes hands on the floor. The time comes from the terminal clock and is never typed. The terminal names the window, machine or locker that wrote the row.
• Durables: the asset ID. It names the exact tool, so you know which wrench is out, not just how many. It stays blank on consumable issues, where the quantity does the work.
• Loans and issues: a charge code. It puts the cost and the tool time on the job or work order. Make it required at issue, because nobody adds it later.
• Loans and send-outs: a due date and a destination. The due date defaults by kind of tool, and for a gauge it never runs past the calibration date. The destination is where the borrower said the tool was going.
• Loans and returns: the condition. Good, worn or damaged, from a fixed list so out and back compare. Anything below good goes to quarantine.
• Returns: the loan it closes. Each return points at its loan, so an open loan is simply a loan nothing points at. A return can carry a different badge from its loan. Keep both, because that is how tools drift between crews.

The crib checkout log has these columns plus notes, a comment line for each field and six example rows. They include a gauge loan capped at its calibration date, a damaged return under another badge and an unfilled request. Use it as the column list when you look at software, or as the log itself in a shared spreadsheet.

Never edit a row once it is written. A return, a send-out and a write-off are each a new row. You can then rebuild the crib as it stood on any past date. That is what an auditor or a damage dispute asks for.

Download the crib checkout log (CSV)

How to handle returns and overdue loans

Take every return the same way at the window, and send the overdue list at each shift change. Checkout is the easy half. The record goes wrong at the return. A tool is left on the counter at shift change, a return is never logged, or nobody reads the overdue list.

1. Scan the tool first, then the badge. The open loan is found from the asset ID, so a tool brought back by someone else still closes the right loan. A return with no open loan is still logged as a return, with a note that no loan matched. It means a loan was never written.
2. Record the condition from the fixed list. Anything below good goes to a marked quarantine bin until someone inspects it. OSHA makes the employer responsible for the safe condition of tools employees use, including their own (29 CFR 1910.242(a)). The return check is the crib's part of that.
3. Check the calibration date. A gauge that is due soon goes to the calibration shelf, not back to the bin.

Send the overdue list at each shift change, grouped by destination. The lead then walks Line 4 once instead of chasing six badges. Escalate on fixed days: the borrower first, then the supervisor. After a set time, mark the tool lost and block the badge from new loans.

Set the days to fit your shifts, and apply them to everyone. A blocked badge can hold up a line, so give supervisors a logged override with a reason. Every override then shows up in the weekly review.

Once a week, match the HR leavers list against open loans by badge. A tool still out on a leaver's badge has nobody left to bring it back.

Where a tool goes after it leaves the crib

After checkout, a tool goes wherever the borrower takes it, and the checkout log only knows where they said it was going. The micrometer sent for calibration could be on the lab's dock, or sitting unlogged in your own receiving area. The wrench loaned to Line 4 may be in a van on its way to another site.

A crowdsourced tag on the tool shows where it was last seen, with a date. It needs no wiring and no data plan, and its battery lasts up to six years, depending on its size. Small tools were rarely tracked, because nothing this small could carry a tracker with web access and site alerts. A coin-sized tag now can, so it fits on a torque wrench or a gauge case.

Any phone that passes reports where it heard the tag. These networks are large (Apple counts over a billion iPhone, iPad and Mac devices, and Google over a billion Android devices).

Tie each tag to the tool's asset ID, and locations join the checkout log on one column. The useful report is the mismatch list. It shows tools the log says are in the crib but were last seen at another site. It also catches loans to Line 4 that were last seen off site.

An exit alert on a geofence around the plant, a boundary drawn on the map, flags a tool that leaves. Without one, the loss waits for the next count.

How to handle calibrated gauges

Handle calibrated gauges with one hard stop at checkout and one query for the day a gauge fails. The hard stop caps a gauge loan at its calibration date and refuses a gauge past its date.

Sending a gauge to the lab is a send-out row, with the lab as destination and the promised date as due. A late lab then lands on the same overdue list as a late borrower.

The query starts when a gauge fails calibration. ISO 9001 then asks you to decide whether earlier measurements are still valid (ISO 9001:2015, clause 7.1.5.2). List every loan of that gauge since its last good calibration, and join each to its charge code. That gives you the work orders to review.

The wider record-keeping, from calibration intervals to audit evidence, is in ISO 9001 asset traceability.

Tool crib management KPIs and how to compute them

Tool crib management KPIs come from the checkout log, joined where needed to your item list. Overdue loans, on-time returns and fill rate need the log alone. Shrinkage, consumable turns and calibration compliance also need item costs, stock on hand and calibration dates.

Consumable turns follow the standard inventory turnover ratio: cost of goods sold over average inventory. For a crib, the cost of consumables issued stands in for cost of goods sold.

Fill rate needs a row for each unfilled request, because otherwise the request leaves no trace. Add unfilled to the row types, and log it at the window in a few seconds.

What to ask of tool crib software

Ask tool crib software to keep a checkout log with no gaps, with a row for every tool or consumable that crosses the counter. If a CMMS storeroom module is on your list, CMMS vs asset tracking covers what a CMMS does and does not track.

Scanning a badge and a tool is the easy part of any equipment checkout software. The differences show in the rows it keeps. Test it against your own log, not the demo, and ask to see these five working.

• Returns are written as their own rows that point at the loan, and loan rows are never overwritten.
• Consumables are issued by quantity against a charge code, apart from durables on loan.
• Gauge loans are refused past the calibration date, and the due date is capped at it.
• An unfilled request takes a few seconds to log at the window.
• Rows come out by export or API with the asset ID on every one, so tag locations and other systems can join to them.

A shared spreadsheet built on the download holds up while one window writes every row. Once machines, lockers or several shifts write rows at the same time, the crib needs software.

What to expect from tags on crib tools

Expect tags on crib tools to update as people pass them, and to show the right building or site.

• Updates come from passing phones. Any phone that passes reports the tag. A plant with people on the floor updates through each shift. A tool left on a bench over a quiet weekend updates when the plant opens again.
• Building-level position. Expect the right building or site, not the right bench or drawer. The asset ID on the tool does the rest.
• Tag the durables and gauges. Consumables are issued and gone. Steel weakens the signal, so a tag inside a closed steel cabinet reports less often. The asset tracking tags guide covers mounting on metal and plastic.
• Where, not who. A tag shows where a tool was last seen. The checkout log shows who took it and for which job, so it stays the custody record.