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SWISS SCREW MACHINING

Swiss Screw Machining for Micro Turned Parts, Ø0.1–10 mm

Small turned parts in production quantities

Ø0.1 mm
Minimum diameter
1,000+ pcs
Production batchesSamples from 100 pcs
13
Swiss-type machines

Ø0.1 mm minimum diameter — feasibility depends on part length, material and features

OUJI small turned shafts, pins and sleeves beside a millimeter ruler
OUJI production parts beside a millimeter ruler.

Diameter range and Swiss-type equipment

Our main range is Ø0.1–10 mm. Swiss-type machining is also known as sliding head turning. Review part length, material and features with the drawing; the equipment limits below do not define a finished-part guarantee.

Micro machining size capabilities

Our current 13 Swiss-type and sliding-headstock machines cover miniature work on the Citizen R04VI and larger turned parts up to a standard Ø32 mm machining diameter.

Ø0.1 mm minimum diameter — feasibility depends on part length, material and features

OUJI Swiss-type equipment and standard machine limits
Machine / typical partsQuantityDiameter / length or strokeToleranceMain / back spindle
Citizen Cincom R04VIMicro shafts, pins, sleeves, inserts and connector contacts5 machinesØ4 × 40 mmCritical dimensions up to ±0.005 mm after drawing and process review20,000 rpm / 20,000 rpm
STAR SR-32JII Type BGuide-bushing or guide-bushless production with Type B backworking2 machinesØ32 mm; 320 mm GB strokeConfirmed after drawing and process review8,000 rpm / 8,000 rpm
STAR SB-20R Type NGuide-bushless short-part turning with backworking2 machinesØ20 mm; NGB stroke 2.5 × bar diameterConfirmed after drawing and process review10,000 rpm / 9,000 rpm
Citizen Cincom L32 IXGuide-bushing or guide-bushless production for larger small turned parts2 machinesØ32 × 320 mm (GB)Confirmed after drawing and process review8,000 rpm / 8,000 rpm
Citizen Cincom A20VIIGuide-bushing or guide-bushless production for small turned parts2 machinesØ20 × 200 mm (GB)Confirmed after drawing and process review10,000 rpm / 8,000 rpm

R04VI maximum length: 40 mm with a fixed guide bushing or 30 mm with a rotary guide bushing.

SR-32JII Type B headstock stroke: 320 mm in standard guide-bushing mode, 286.5 mm with the Rotary Magic Guide Bush (R.M.G.B.) unit, or 2.5 × bar diameter, capped at 80 mm, in guide-bushless mode.

SB-20R Type N is guide-bushless only. Headstock stroke is 2.5 × bar diameter, capped at 55 mm; for Ø20 mm stock the formula gives 50 mm, not 55 mm.

L32 IX maximum length per chuck: 320 mm in guide-bushing mode or 2.5 × workpiece diameter in guide-bushless mode.

A20VII maximum length: 200 mm in guide-bushing mode or 2.5 × workpiece diameter, capped at 55 mm, in guide-bushless mode.

GB means guide-bushing mode; NGB means guide-bushless mode. Standard machine limits depend on the installed configuration and are not a guarantee that maximum diameter, length and tolerance can be achieved together. Optional larger-diameter configurations are not included.

Mazak QTE-200MSY L turn-mill centers use a fixed headstock and are not included in this Swiss-type and sliding-headstock machine count.

Tolerances shown are typical targets. Final tolerance depends on material, feature size, part length and inspection method, and is confirmed after drawing review. For general guidance on critical dimensions, see ourCNC machining tolerance guide.

Materials and plating

Specify the material grade and condition, then identify the dimensions and surfaces that matter after plating.

  • Brass
  • Stainless steel
  • BeCu C17200
  • Kovar
  • Phosphor bronze

Gold over nickel plating available

Include plating requirements and any dimensions that apply to the finished part in your inquiry.

Production quantities, with inspection in view

Production batches start at 1,000 pieces; samples start at 100 pieces. For high volume orders, include annual demand as well as the first-batch quantity. OUJI uses KEYENCE optical measurement and operates under ISO 9001:2015. Specify the dimensions and inspection records required for your order.

BRASS CONTACTS · PROCESS PHOTOGRAPHS

From bar stock to finished contacts

Follow tagged brass stock through Citizen R04VI machining, part collection and optical measurement. The photographs show the production route for small connector contacts.

  • Material identification at the bar rack
  • Bar-fed machining after first-part verification
  • Part collection and non-contact inspection
View the process photographs
Close-up of micro-turned brass connector contacts showing stepped diameters, knurling and through-bores

Dimensions after finishing

Identify fits and surfaces that must meet the drawing after plating, heat treatment or other finishing. Include coating thickness, masking, surface roughness and burr requirements.

Surface finishing options

Certificates & traceability

Specify the material standard, certificate type and any restrictions on substitutions. The documentation scope is agreed with your order.

Material certificates & traceability

Inspection of small turned parts

Critical dimensions, edge condition and handling matter at this scale. The inspection method and report scope are agreed around the drawing and finished-part requirements.

First-part verification

The first piece from a new setup is checked against the drawing before batch production. Critical dimensions and the inspection method are established at this stage.

Dimensions, burrs & handling

In-process checks watch for dimensional drift, tool wear, burrs and handling damage. Small profiles can be measured on KEYENCE optical systems without a contact probe touching the feature.

Final checks & reports

Finished parts are checked against the agreed requirements. Specify which dimensions need recorded values, the report format and any material certificates when requesting a quote.

Quality assurance at OUJI
OUJI operator measuring a small turned part on a KEYENCE optical measurement system
KEYENCE optical measurement at OUJI.

What to prepare before requesting a quote

When choosing a CNC turned parts manufacturer, start with the drawing and expected quantities. These help define the machining, plating and inspection scope.

Drawing and critical dimensions

Send a dimensioned drawing and a model if available. Identify critical features, fits and any dimensions that apply after plating.

Annual volume and first batch

Include expected annual volume, first production batch and sample quantity. Production starts at 1,000 pieces; samples start at 100 pieces.

Material, plating and documents

Specify material grade and condition, plating requirements, material certificate type and the traceability scope you need reviewed.

Drawing review for Swiss machined parts

For small turned parts with slender profiles, related diameters and front or back features. OUJI reviews the complete drawing and quantity to select the machine, workholding and inspection method.

Part files & critical features

A dimensioned PDF or DWG drawing and a STEP model if available. Include the current revision, threads, datums, fits and burr requirements.

Small shafts & pins

Stepped diameters, slender profiles and locating features. Show the mating fits, straightness and datum requirements on your drawing.

Sleeves & thin-wall parts

Small bores and lightly supported walls need a machining and inspection plan. Identify burr-sensitive edges and surfaces that must remain unmarked.

Questions about Swiss screw machining

Diameters, quantities, drawing review and documentation requirements.

Sample orders for Swiss-type and micro machining start at 100 pieces. Include the expected production quantity with your sample inquiry.

Send your drawing and annual volume

Production from 1,000 pieces. Samples from 100 pieces. Include material and plating requirements so we can review the part.

Send drawing + annual volume

Tell us the part and quantity you need. Add material or delivery requirements if known; details already in your drawings do not need to be repeated.

    For quotation and manufacturing review only.Your selected files are sent securely only after you submit this RFQ.

    We review your drawing, material, part dimensions and sample / annual volumes before quoting.

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