Qualitätssicherung

Quality is always our highest priority. Every project goes through strict inspection before shipment, ensuring that every part meets the required tolerances and specifications. With a proven global track record, Tuofa is your reliable CNC machining partner for precision-critical components.

Manufacturing Standard

Quality Control System

Quality Reports & Certification

Design Sample & Verification Program

Manufacturing Standards of CNC Machining Services

For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005” (metals) or +/- 0.010mm (plastics and composites) by ISO 2768 unless otherwise specified.
Sharp edges will be broken and deburred by default.
As machined surface finish is 125 Ra or better. Machine tool marks may leave a swirl-like pattern.
Clear or transparent plastics will be matte or have translucent swirl marks on any machined face. Bead blasting will leave a frosted finish on clear plastics.
For features of orientation (parallelism and perpendicularity) and form (cylindrical, flatness, circularity, and straightness) apply tolerances as follows (see the table below):

Limits for Nominal Size	Plastics (ISO 2768-m)	Metals (ISO 2768-f)
0.5mm* to 3mm	±0.1mm	±0.05mm
Over 3mm to 6mm	±0.1mm	±0.05mm
Over 6mm to 30mm	±0.2mm	±0.1mm
Over 30mm to 120mm	±0.3mm	±0.15mm
Over 120mm to 400mm	±0.5mm	±0.2mm
Over 400mm to 1000mm	±0.8mm	±0.3mm
Over 1000mm to 2000mm	±1.2mm	±0.5mm
Over 2000mm to 4000mm	±2mm	-
All parts are deburred. Tightest achievable tolerance is +/-0.01mm and is dependent on part geometry.

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Manufacturing Standards of Sheet Metal Fabrication Services

Tuofa machining factory has the experience and the right sheet metal fabrication services necessary to bring your idea to life.
This includes services like high tolerance and wide thickness range laser cutting, bending capabilities, and other surface finishing options.

Dimension Detail	Tolerance
Edge to edge, single surface	+/- 0.005 inch
Edge to hole, single surface	+/- 0.005 inch
Hole to hole, single surface	+/- 0.005 inch
Bend to edge / hole, single surface	+/- 0.010 inch
Edge to feature, multiple surface	+/- 0.030 inch
Over formed part, multiple surface	+/- 0.030 inch
Bend angle	+/- 1°
By default, sharp edges will be broken and deburred. For any critical edges that must be left sharp, please note and specify in your drawing.

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Quality Inspection

Tuofa strictly implements 10 steps quality inspection to ensure that the qualified rate is higher than 99.98%.

Packing

Quality Reports

At Tuofa, our approach strictly adheres to the ISO 9001-certified quality management system. We execute inspection and quality control system for the whole process to make sure every project meets your requirements. Our quality assurance starts from incoming materials inspection, then first article and in-process inspection, and final inspection and testing with reports and certifications before shipping.

Inspection of raw materials is a must to ensure our supply chain is up to standard. Process checks help us catch any problems early, fix them. Final inspection and factory inspection are the most authoritative and help us to verify that our customers are only receiving parts that meet their high standards.