QC Profile

Quality Assurance (QA) of Tuofa precision Machining Manufacturer


  • Get a free quote within 12 hours

  • 50+ metals and plastics, 10+ surface finishes

  • Machined prototypes in as fast as 1 day

  • Tolerances down to ±0.0002" (0.005mm)

  • Custom design depending on customer requirement

  • ISO9001:2015, ROHS & CE Certification

Tuofa Manufacturing Standards of CNC Machining Services

  • For features of size (length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005” (metals) or +/- 0.010 (plastics and composites) by ISO 2768 unless otherwise specified.

  • Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.
  • 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



Over 3mm to 6mm



Over 6mm to 30mm



Over 30mm to 120mm



Over 120mm to 400mm



Over 400mm to 1000mm



Over 1000mm to 2000mm



Over 2000mm to 4000mm



All parts are deburred. Tightest achievable tolerance is +/-0.01mm and is dependent on part geometry.



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


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.



Contact Details