ISO 9001:2015 · IATF 16949 Certified

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Turned Components

Stainless Steel CNC Machining

Shafts, pins, valve stems and fittings turned from bar to your drawing, passivated or electropolished. 17-4PH bearing diameters are ground to ±0.005 mm, with the condition set per drawing. Send your drawing for a quote.

  • Ground diameters±0.005 mm
  • DiameterØ 3 – 65 mm bar
  • Material303 · 304 · 316L · 17-4PH
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  • Made under ISO 9001:2015, with mill cert and heat number on every lot
  • FAI report approved before the run starts
  • No minimum beyond a single part
Specifications

Stainless Turning Specifications

  • Dimensional capability
    ProcessCNC turning from bar, ground tight diameters; slender small parts on swiss cnc machining
    Diameter rangeBar Ø 3–65 mm; billet for larger sections
    LengthPer drawing, L/D reviewed at quote; billet to 200 mm
    Diameter toleranceGround ±0.005 mm, turned ±0.01 mm
    Surface finishRa 1.6 µm standard; Ra 0.4 µm when called out
    ThreadsM1.6–M36, UNC / UNF
    Secondary featuresCross holes, flats, knurls, grooves, laser marking
  • Ordering
    BasisBuild-to-print; other metals under CNC turned parts
    Minimum order1 piece
    Prototype lead time3 days (fast); 2–3 weeks typical
    Production lead time4–6 weeks typical
    Batch size100–100,000+ pieces
    File formatsSTEP or IGES with 2D GD&T drawing; SLDPRT, PRT, DWG, PDF
    PackingVCI film, anti-rust oil, trays; packing machined parts for sea freight
Material

Stainless
Finishes

303 vs 304 stainless steel comes first; passivation of stainless steel follows.

Quality Control

Proof With
Every Lot

CMM inspection of a machined aluminium part
  • 01

    Incoming material

    The mill certificate and heat number are matched to the grade on your drawing before bar reaches a machine, so each lot traces back to its melt.

  • 02

    First article inspection

    The first piece is measured on the CMM and the FAI report is sent to you. The run begins only after your sign-off.

  • 03

    In-process SPC

    Operators sample critical dimensions through the run to an AQL plan, so drift is corrected at the machine instead of at the end.

  • 04

    Final inspection

    Every lot gets a 100% dimensional and visual check. The material certificate and inspection record ship standard; PPAP packages are available on request. See the precision machined medical parts case, made under the ISO 9001 quality system with full traceability.

FAQs

Stainless Questions,
Answered.

Still looking for something? Contact us and our team answers within one business day.

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  • Is 304 or 316L better for machining?

    Stainless turns well on a rigid setup, and 304 generally cuts more easily than 316L. Choose 316L when chlorides or chemicals are the concern. If corrosion demands are modest, 303 is the easiest of the three, at some cost in corrosion resistance and weldability.

  • How do I specify the 17-4PH condition?

    Call out the condition on the drawing, for example H900 or H1150, plus the hardness range you need. Lower H numbers give higher strength; higher ones trade strength for toughness. We work to the condition per your drawing.

  • Should 17-4PH be machined before or after aging?

    Aging shifts dimensions slightly, so tight diameters are best finished after it, typically by grinding, with roughing done earlier. State your preference on the drawing; the route is confirmed on the quote.

  • What tolerances can you hold on stainless turned parts?

    Ground diameters hold ±0.005 mm and turned diameters ±0.01 mm. Ra 1.6 µm is the standard finish, and Ra 0.4 µm is available when called out. Mark critical features on the drawing so they are checked first.

  • What is the minimum order and lead time?

    One piece is the minimum. Prototypes ship in 3 days on the fast route, with scope confirmed at quote, or in 2–3 weeks typically. Production lots run 4–6 weeks typically. Rush options exist for many jobs and are confirmed per quote.

  • What paperwork comes with each lot?

    A material certificate showing mill and heat number ships with every lot, with the inspection record from the 100% final check. An FAI report is sent before production starts. PPAP packages are available on request.

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