PFMEA Special Characteristics Register Worksheet
Special characteristics are the product and process features that drive safety, regulation or fit and function. This register keeps them in one list so the drawing, PFMEA and control plan always agree.
| Char ID | Characteristic | Type | Classification | Source | Operation | Control method | Latest Cpk | Cpk target | Gap to target | Meets target (1 yes) | |
|---|---|---|---|---|---|---|---|---|---|---|---|
0.05 | 1 | ||||||||||
0.12 | 1 | ||||||||||
-0.12 | 0 | ||||||||||
0.17 | 1 |
Classification names and symbols vary by customer. Use the symbols and capability targets from your customer requirements. Cpk targets shown are examples, not requirements.
Sync characteristics with ERP inspection plans
Optional: we can compare your register with ERP inspection plans and flag gaps.
Optional. The tool and every export work without this. No spam.
How to use the register
List each characteristic when it first appears on a drawing, in a customer requirement or in the FMEA. Classify it, name the operation that creates it and record the control. Add the latest Cpk and the target your customer or procedure requires; the sheet computes the gap and flags items below target. Export to Excel for audit packs.
- Give each characteristic a stable ID
- Link the ID in the PFMEA and control plan
- Update Cpk after every capability study
- Review the list at every drawing revision
Why linkage matters
IATF 16949 and AS9100 both expect special or key characteristics to flow from design through process planning to controls. An auditor will pick a characteristic from the drawing and trace it to the PFMEA severity, the control plan reaction and the measurement system. A single register makes that trace quick.
Reading the capability columns
A gap of zero or more means the latest Cpk meets the target. Negative gaps mean the process needs action, tighter control or a higher inspection frequency until capability is improved. Cpk is only meaningful with a stable process and a capable gauge, so confirm measurement system analysis before you trust the number.
Common mistakes
Classifying everything as special dilutes attention and inflates inspection cost. Leaving a characteristic in the PFMEA but not the control plan is a classic audit finding. Copying symbols from one customer to another is risky since each customer defines its own classification system.
Frequently Asked Questions
Are the classifications standard?
No. Customers and industries define their own symbols and names, and the AIAG-VDA handbook leaves classification to the organization and customer. Use the terms in your customer requirements and record them here.
What Cpk target should I use?
Use what your customer specifies. Many automotive customers ask for at least 1.33 for ongoing production and 1.67 for initial studies on special characteristics, but confirm in your own requirements.
Should process characteristics be listed too?
Yes, if they drive a product special characteristic, such as a torque setting or oven temperature. Mark the type as process and link it to the product characteristic it protects.
How is this different from the control plan?
The control plan lists every control by operation. This register is the master list of the special items and ensures each one appears in the control plan with the right method.
If your ERP inspection plans and your control plan disagree, Netray can help reconcile them. Ask for a short review.
Related Tools
FMEA Recommended Actions Tracker Worksheet
Track each FMEA action with owner, due date, status and before-and-after ratings, with RPN and RPN reduction calculated automatically.
Quality & InspectionFMEA Failure Mode Brainstorm Worksheet
Capture process steps, functions, failure modes, effects and causes in one structured table before you score severity, occurrence and detection.
Quality & InspectionFMEA RPN and Risk Reduction Calculator
Compare RPN before and after an action and see how much each rating contributes to the reduction.
Quality & InspectionFMEA Team Kickoff and Scope Template
A one-page planning document that fixes the FMEA scope, team, boundaries and rating scales before anyone writes a failure mode.
More Quality & Inspection tools
See all- Measurement System Analysis Plan Template
- SAP QM Process Capability Cp Cpk Calculator
- SAP QM Lot Rejection Rate, PPM and Sigma Level Calculator
- SAP QM Gauge R&R Study Calculator
- SAP QM Cp and Cpk Capability Calculator
- Job Shop Material Certification Log Worksheet
- Job Shop First Piece Inspection Sign-Off Template
- Job Shop Scrap and Rework Cost Calculator
- Master Data Audit Sample Size Calculator