Quality · Lot tracking & records
Traceability
Every shipment carries a lot code that traces back to the corresponding in-process control records.
Traceability is the documentation that lets your incoming QC team — or an auditor — answer "where did this part come from" in less than five minutes. Wolfer's lot system ties every shipped part back through inspection, heat-treatment, cutting, and material origin.
Last updated Reviewed by Luo Genwen, Production Plant Manager
Default record retention is 10 years. Customers in regulated industries (medical, aerospace) sometimes request longer retention — we accommodate on request.
If a customer ever finds a defective part, the lot code on the label is the entry point into the full record. We have used this system to identify a single defective process lot out of 200 lots shipped in a year — and to confirm that only 8 customers received parts from that lot.
Quality
What gets tracked
STEP 01
Material — mill certificate
EN 10204 3.1 mill certificate on every part lot. Heat number traceable to the steel mill.
STEP 02
Cutting record
CNC program version, operator ID, machine ID, date logged per part lot.
STEP 03
Heat-treatment record
Furnace run number, temperature profile, hardness verification. Attached to lot.
STEP 04
Grinding record
Tool wear log, in-process dimensional check.
STEP 05
Inspection record
CMM trace + gear-inspection center output (for gears). Lot-coded.
STEP 06
Shipment label
Lot code printed on each part label. Recall trace from label → part → all 5 records above.
Related pages
Continue exploring quality.
Digital Management
3D drawing database, FEA validation, and traceable production records for every shipment.
Read →Inspection
Every part measured before it ships. PREC60 gear measuring center, CMM, hardness, surface.
Read →Certifications
ISO 9001:2015 · SGS · National High-Tech Enterprise · Tax Credit A.
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