Tolerance Deviation and Concession Request Template
When a lot measures just outside the drawing, the real question is whether the part still fits, forms and functions. A concession request puts that argument, the cause and the approvals on one page.
Fill in
Tolerance Deviation and Concession Request Template
Deviation / Concession Request
Company: Acme Precision Ltd Request no: DEV-2026-0147 Date: 2026-10-20 Part: PN-48213 Rev C Lot or serials: Lot 26-1033, 40 pieces Scope: One-time, this lot only
Nonconformance
| Feature | Requirement | Measured |
|---|---|---|
| Bore B2, zone C4 | 25.000 to 25.021 mm | 25.026 to 25.031 mm |
Fit, form and function assessment
Mating shaft is 24.980 to 24.993 mm. Worst-case clearance increases from 0.041 mm to 0.051 mm. Bearing life and noise requirement not affected per engineering analysis.
Cause and corrective action
Boring bar wear. Tool life limit reduced and in-process gauging added at 10 piece intervals.
Disposition decision
| Option | Selected |
|---|---|
| Accept as is | |
| Accept with rework | |
| Reject and scrap | |
| Return to supplier |
Approvals
Many customer contracts and standards require customer approval before shipping nonconforming product. Check your contract. This is a starting point, not legal advice.
Track concessions against lots in your ERP
Optional review of how deviation approvals attach to inspection lots and inventory.
Optional. The tool and every export work without this. No spam.
How to fill it in
State the exact feature, the drawing requirement and the measured range. Then write the fit, form and function argument with numbers: compare the new worst-case clearance or interference against the mating part. Pick a scope so nobody mistakes a one-time concession for a standing change. Finish with the cause and what stops it recurring.
Deviation versus waiver versus drawing change
A deviation or concession accepts a specific nonconforming quantity. If the drawing tolerance is simply unrealistic, the right answer is a drawing change, not a stream of repeat concessions. The scope picker makes that visible: a permanent request should trigger an ECN.
- One-time: this lot only, no precedent
- Limited quantity: a stated count or date
- Permanent: needs a drawing revision
Common mistakes
Teams often write 'engineering says OK' without any numbers. Show the stack-up or the fit change. Also avoid shipping before the customer signs when the contract requires it, and remember to quarantine and tag the lot in the ERP so the deviation follows the stock.
Frequently Asked Questions
What is the difference between a deviation and a concession?
Usage varies. A deviation is often approved before production, a concession after a part has been made nonconforming. Many companies use one form for both. Use the terms your customer contract uses.
Do I always need customer approval?
Not always, but many aerospace, defense and automotive contracts require it for nonconformances that affect form, fit or function or that are not repairable. Read the contract and quality clauses.
How do I show the fit impact?
Recompute minimum and maximum clearance or interference with the measured values and compare to the functional limits. Include the mating part dimension so the reviewer can follow the maths.
Should the ERP know about the concession?
Yes. Reference the request number on the lot or inspection record so receiving, inventory and shipping can see the lot is accepted under concession.
If concessions are tracked by email today, we can help build a controlled deviation workflow tied to lots in your ERP.
Related Tools
Engineering Drawing Release Request Template
A release request form that records revision, tolerance and GD&T review status, affected parts and approvals before a drawing goes to the shop floor.
Quality & InspectionTolerance vs Process Capability Review Worksheet
A worksheet that checks each toleranced feature against measured process mean and standard deviation, returning Cp, Cpk and predicted defects per million.
Engineering & PLMHole and Shaft Fit Clearance Worksheet
An editable worksheet that computes minimum and maximum clearance (negative means interference) for each hole and shaft pair from their limit sizes.
Quality & InspectionOut-of-Tolerance Calibration Impact Assessment Template
Document an out-of-tolerance finding: gage, as-found data, product measured since last good calibration, decision and corrective action.
More Quality & Inspection tools
See all- A3 Problem Solving Report Template
- Rolled Throughput Yield Calculator
- A3 Problem Solving Template
- Rolled Throughput Yield Calculator
- Cpk Confidence Interval and Sample Size Calculator
- X-bar and S Control Chart Limits Calculator
- Individuals and Moving Range (I-MR) Chart Limits Calculator
- Expected PPM Out of Specification Calculator
- Taguchi Loss Function Calculator