What Should a Tooling Dimensional Inspection Report Include?

Tooling Quality Guide · Shanghai Hongli Metal Forming Technology Co., Ltd

Here is the difference between two punch deliveries. Supplier A sends a punch with a one-line note: "inspected, passed." Supplier B sends a punch with a report that reads: bore 12.012 mm (drawing 12.000^+0.015), OD 24.000 mm H6, concentricity cavity-to-OD 0.003 mm, surface finish Ra 0.15 µm in the working zone, material M2/1.3343, hardness 62 HRC, signed by quality control with a tool number and calibration date.

Both punches might run identically. But only one delivery tells you what you actually bought — and gives you the record you need to reorder a matching spare, catch drift, and hold the supplier accountable if the tool does not perform. That second punch came with a proper tooling dimensional inspection report.

This guide explains what such a report must include, why each field matters, and how to tell a genuine quality document from paperwork. It is written the way a manufacturing engineer would expect — by the numbers.

A "Pass" Is Not a Measurement

The most important idea in this whole guide: a report that only says "pass" or "OK" is not doing its job.

If a dimension reads "pass" against a tolerance of +0.000/−0.005 mm, you have no idea whether the actual value was dead-on the nominal or 0.004 mm from the limit. The two situations are very different for how the tool runs, how much life it has, and whether it will match the next spare you order. An inspection report exists to give you the measured number — the "pass" is just the conclusion the supplier drew from it.

Rule of thumb: you should be able to look at the report and reproduce the tool's geometry in your head from the numbers, without ever seeing the physical part. If you cannot, the report is incomplete.

The Five Sections Every Report Must Carry

A complete dimensional inspection report for a cold forming tool breaks into five parts. Missing any one weakens the document:

1. Identification and traceability — whose tool, which order, when.
2. The dimensions that control the part — the forming geometry, with drawing tolerances.
3. Fits, concentricity and surface finish — the precision characteristics that decide run quality.
4. Material and hardness evidence — what it is made of and how it was treated.
5. Equipment, calibration and approval — how it was measured and who signed off.

Let us go through each one.

Section 1 — Identification and Traceability

Every report needs a header that anchors it to a specific tool and order. Without this, the document is meaningless if there is ever a dispute or a reorder. Look for:

• Customer name and purchase order / reference number.
• Part name and tool number (or die-set number).
• The customer's drawing number and revision it was built to.
• Date of manufacture and date of inspection.

Traceability is what lets you order a spare later that matches the original, and what makes batch-level quality accountability possible. This is the field that turns a one-off purchase into a repeatable tooling relationship.

Section 2 — The Dimensions That Control the Part

This is the heart of the report: the measured geometry of the forming surfaces, each compared against the drawing tolerance. For a cold forming die, the dimensions that control the part typically include:

• Cavity / forming profile dimensions — the shape that produces the fastener head, body, or thread, held to the drawing's stated tolerance.
• Bore and OD diameters — where the tool fits into the holder or accepts the punch.
• Lengths and shoulder positions — shut-height-relevant dimensions.
• Critical angles and radii — on punches, the point angles and corner radii that control forming and stress.

Each line should show three things: the nominal dimension and its tolerance from the drawing, the measured value, and the conclusion (in/out). General dimensions without a stated tolerance fall under a drawing default such as ISO 2768 unless the drawing says otherwise — the report should state which tolerance standard it applied.

Section 3 — Fits, Concentricity and Surface Finish

These are the precision characteristics that often decide whether the tool runs smoothly or produces eccentric or scrap parts. They are easy to overlook on a report, and easy for a supplier to skip:

These are the numbers a punch or die manufacturer actually controls on the machine, and they are why inspection matters as much as design. A die can be perfectly to drawing on its big dimensions and still be a poor tool if its concentricity is off.

Section 4 — Material and Hardness Evidence

A dimensional report proves the shape; it does not by itself prove the material. The tooling should come with material evidence that answers:

• What steel or carbide grade? For steel components this is named grades like D2/1.2379, M2/1.3343, 4140 or H13; for carbide inserts, the cobalt grade such as YG15 or YG20C — a specific grade, not the word "carbide."
• What hardness after heat treatment? A working hardness range, e.g. tool steel at 58–62 HRC, stated with the actual measured value.
• What carbide material certificate (MTC)? If the supplier states a carbide grade, a mill/material certificate documents its actual chemistry.

Material is where a supplier can silently downgrade — substituting a cheaper steel or a lower-grade "imported carbide" without telling you. Naming the grade and backing it with a certificate closes that gap.

Section 5 — Equipment, Calibration and Approval

A measured number is only as good as the instrument that produced it. The report should state, or make available on request:

• The measuring equipment used (micrometers, bore gauges, roundness tester, surface-roughness instrument, CMM, profile projector).
• The calibration status of that equipment — calibrated, with traceable certificates and a calibration date.
• The operator and approval sign-off — who measured, and who in quality control approved it, with dates.

The reason this section exists is that anyone can type numbers into a form. The confidence in the numbers comes from the instrument being accurate and the person being accountable. A report signed by a quality function, tied to a calibrated instrument, is a document — an unsigned sheet of numbers is just a suggestion.

For context on what production precision makes these report values achievable: precision cavities and inserts are cut on wire EDM machines running 0.1–0.3 mm wire with 0.05 µm positioning scales, and complex pockets run on a five-axis machining center holding ±0.002 mm positional accuracy calibrated per ISO 230-2. Steel components are vacuum heat-treated with ±1 °C temperature control. These machine-level capabilities are the reason the numbers on the report are real, not aspirational.

A Field-by-Field Report Skeleton You Can Use

Here is a clean template of the fields you should expect — or ask for — on a cold forming tooling inspection report. You can send this to any supplier as your expectation:

Red Flags That the Report Is Hiding Something

You can tell a lot about a supplier from how much they are willing to show you. Treat these as warning signs:

• Only "pass"/"OK" markings, no measured numbers. They are either not measuring or do not want you to see how close to limit the parts run.
• No traceable tool or order number. The report cannot be tied to a specific tool, so it is hard to use for reorders or disputes.
• No stated material grade or hardness. Combined with a vague "pass" this is how grade substitution hides.
• No calibration or approval fields. Anyone can fill in numbers; without calibration and sign-off there is no accountability.
• Dimensions listed with no drawing tolerance. A number with no tolerance tells you nothing about whether it was actually in spec.

A supplier that pushes back on providing measured values is telling you something — and it is not about protecting you from paperwork.

The Bottom Line

An inspection report is not a formality; it is the manufacturing evidence that the tool you paid for is the tool you got. Expect identification and traceability, measured forming dimensions against stated tolerances, fits and concentricity and surface finish, named material grades with hardness, and calibrated, approved verification. If your supplier's report stops at "pass," ask for the numbers — and for tools where quality decides the run, accept nothing less.

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