Quality Engineered Into Every Part
ISO 9001:2015 certified processes govern every stage of production, from incoming material to final dispatch.
ISO 9001
Certified since 2008
100%
First-article inspection
±0.005mm
Tightest verified tolerance
12
Calibrated inspection instruments
Quality Policy
What We Commit To, In Writing
“STS Engineering exists to deliver components that meet drawing specification every time — not most of the time. We hold ourselves to the tolerance a customer will actually measure against, and treat every non-conformance as a chance to fix the process, not just the part.”
Meet or exceed every dimensional, material and documentation requirement on the customer's drawing — not our interpretation of it.
Catch process variation through in-process monitoring, before it produces a defect, rather than sorting for it afterward.
Maintain full material and process traceability on every batch, back to heat number and machine log.
Treat every non-conformance as a root-cause investigation, not a one-off correction.
Keep every calibration, certification and audit record current and available on request.
Quality Control
How Variation Gets Caught Before It Ships
In-Process SPC
Statistical process control on running batches flags drift before parts go out of tolerance.
First-Article Inspection
Every new part number gets a full FAIR report against the drawing before batch release.
Documented Control Plans
Every part family runs against a written control plan defining what's checked, how often and by whom.
Root-Cause Investigation
Non-conformances are traced to source — tooling, material or process — not just corrected and closed.
Inspection Facilities
Our Metrology & Inspection Lab
Housed separately from the production floor in a climate-controlled lab, so measurement conditions stay consistent regardless of what's running on the shop floor.
Coordinate Measuring Machine (CMM)
±0.002mm accuracy, 600×500×400mm envelope
Surface Roughness Tester
Ra 0.01–10µm measurement range
Hardness Testers
Rockwell & Brinell, metals and alloys
Optical Comparator
Profile and dimensional verification, 2D geometries
Spectrometer
Material composition verification per batch
Height & Bore Gauges
Calibrated micrometers, verniers and bore gauges
Quality Assurance
The End-to-End QA Workflow
Incoming Material Inspection
Raw material verified against certification and drawing spec before it reaches the floor.
In-Process Checks
Critical dimensions checked at set intervals through every production run, not just at the end.
First-Article Inspection
Every new part number is fully measured and documented before batch production begins.
Final Inspection
100% or statistical sampling inspection before a batch is released for packing.
Documentation & Traceability
Every inspection result is logged against batch, material lot and operator for full traceability.
This entire workflow runs under our current ISO 9001, ISO 14001 and ISO 45001 certifications — view the certificates and their scope.
Let's Build Something
Ready to Start Your Next Program?
Send us your drawing, requirement or a rough sketch — our engineering team responds with a real quote, not a form letter.