Product Category
FMS — 001 to 023
Precision
Turned
Parts
23 product lines in free-machining steel, brass, stainless, and titanium — from Swiss-type long shafts at Ø0.5 mm to medical small hardware, precision terminals, threaded connectors, locating pins, nozzle seats, and communication hardware. Every micron matters.
Min OD (Swiss-type)Ø0.5 mm
OD Toleranceh6 / h7
Surface FinishRa ≤0.4 μm
Thread Class4H/4h · 6H/6g
Cylindricity≤0.002 mm
L/D Ratio (Swiss)>20:1
Swiss
Ø0.5mm Min
23
Product Lines
23
Product Lines
Ø0.5mm
Min OD Swiss
h6 / h7
OD Tolerance
Ra ≤0.4μm
Surface Finish
24hr
Quote Turnaround
Precision Turned Shaft ✦
Small Shaft ✦
Stepped Shaft ✦
Nut Seat ✦
Precision Threaded Part ✦
Threaded Connector ✦
Adapter Connector ✦
Contact Pin ✦
Locating Pin ✦
Pin Nail ✦
Plunger ✦
Bushing ✦
Precision Sleeve ✦
Nozzle Seat ✦
Connector Metal Part ✦
Communications Hardware ✦
Instrument Connector ✦
Medical Small Hardware ✦
Swiss-Type Long Shaft ✦
Small Connecting Post ✦
Cylindrical Standoff ✦
Hex Turned Part ✦
Precision Terminal ✦
Precision Turned Shaft ✦
Small Shaft ✦
Stepped Shaft ✦
Nut Seat ✦
Precision Threaded Part ✦
Threaded Connector ✦
Adapter Connector ✦
Contact Pin ✦
Locating Pin ✦
Pin Nail ✦
Plunger ✦
Bushing ✦
Precision Sleeve ✦
Nozzle Seat ✦
Connector Metal Part ✦
Communications Hardware ✦
Instrument Connector ✦
Medical Small Hardware ✦
Swiss-Type Long Shaft ✦
Small Connecting Post ✦
Cylindrical Standoff ✦
Hex Turned Part ✦
Precision Terminal ✦
Full Product Range
23 Precision Turned
Product Lines
Select a category tab · Free-machining steel · Swiss-type capability · MOQ 1 piece
Product Categories
Precision turned shafts, small-diameter shafts, stepped shafts, and nut seat bodies in free-machining steel (1215, 12L14), stainless (SS303), brass, and titanium. OD tolerance h6/h7; Ra ≤0.4 μm standard. Swiss-type turning for L/D >10:1 — no deflection, consistent tolerance across full length. Stepped shaft shoulder perpendicularity ≤0.005 mm; nut seat bore concentricity ≤0.005 mm.
FMS-001
SHAFTS / 001 — FEATURED
Precision Turned Shafts
Precision CNC-turned cylindrical shafts in free-machining steel 1215 (sulphurised) or 12L14 (leaded). OD tolerance h6 (±0.005–0.008 mm) as standard; h7 for general precision applications. Surface finish Ra ≤0.4 μm off the lathe — no secondary grinding required due to the superior surface finish of free-machining steel. Straightness ≤0.02 mm/m; cylindricity ≤0.005 mm. Keyways, cross-holes, flats, and tapped features in same CNC setup. Diameter range Ø1 mm to Ø80 mm standard; Swiss-type turning for Ø0.5 mm to Ø20 mm with L/D >10:1. Nickel or hard chrome plating available for corrosion and wear resistance. Bulk production quantities quoted at competitive pricing — free-machining steel cuts 3× faster than 45# carbon steel.
1215 · 12L14 · SUM24L · SS303 · Brass
Get Quote
FMS-002
SHAFTS / 002
Small Shafts
Small-diameter precision shafts Ø0.5–Ø8 mm on Swiss-type CNC lathes for medical instruments, connector pins, watch components, and precision instruments. L/D ratios up to 25:1 achievable. OD h7; Ra ≤0.4 μm. Chamfered or radiused ends. Bulk packaging in protective trays.
1215 · SS303 · Ti · BrassGet Quote
FMS-003
SHAFTS / 003
Stepped Shafts
Multi-diameter precision stepped shafts. Shoulder perpendicularity ≤0.005 mm; bearing seat h6. Step diameter tolerance ±0.005 mm. Shoulder radius ≥R0.3 mm to prevent fatigue notch. Swiss or conventional turning depending on diameter and L/D ratio.
12L14 · SS303 · BrassGet Quote
FMS-004
SHAFTS / 004
Nut Seats
Precision nut seat bodies and threaded insert housings. Internal thread 4H/6H; bore concentricity to OD ≤0.005 mm. Knurl, hex, or round OD for spanner grip or press-fit. All thread features inspected with go/no-go gauges before delivery.
12L14 · SS303 · BrassGet Quote
Materials: 1215 · 12L14 · SUM24L · SS303 · SS316L · Brass · Ti Grade 2
Request All 4 →Contact pins, locating and dowel pins, pin nails, plunger bodies, bushings, and precision sleeves — the highest-volume precision turned product families. Contact pin cylindricity ≤0.002 mm; locating pin OD h6 with Ra ≤0.4 μm; bushing OD/ID concentricity ≤0.005 mm. All pins supplied with protective packaging for dimensional stability during transit.
FMS-005
PINS / 005 — FEATURED
Contact Pins
Precision contact pins and test probe pins for electrical connectors, ICT test fixtures, spring contact assemblies, and pogo pin applications. OD h6 tolerance; cylindricity ≤0.002 mm — critical for consistent contact force in spring-loaded pin assemblies. Ra ≤0.2 μm on contact barrel achieved by precision turning in free-machining steel followed by electropolish or barrel polishing. Tip geometry to drawing — pointed (cone), flat, crown, chisel, or spherical radius. Hardened version: 1215 steel with hard chrome plating 900–1200 HV for wear-resistant contact surfaces. Gold plating (0.1–0.5 μm) over nickel for low-contact-resistance electrical signal applications. Bulk quantities to 50,000 pieces.
1215 · 12L14 · SS303 · BeCu · Brass
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FMS-006
PINS / 006
Locating Pins
Precision dowel and locating pins, OD h6/h7, Ra ≤0.4 μm, cylindricity ≤0.003 mm. Hardened options: GCr15 HRC 60–64 or 40Cr HRC 55–60. Chamfered leading end (15° standard) for easy assembly guidance. DIN 7 and ISO 8734 standard dimensions stocked; custom to drawing.
1215 · GCr15 · SS303Get Quote
FMS-007
PINS / 007
Pin Nails
Small precision pin fasteners, OD tolerance h8. Pointed or flat end; chamfered lead-in. Bulk quantities in protective packaging. Free-machining steel or stainless. Zinc or nickel plating options.
1215 · SS303 · BrassGet Quote
FMS-008
PINS / 008
Plungers
Spring plunger, ball plunger, and latch plunger housings. External thread 6g; through-bore for ball and spring assembly. Available in light, medium, and heavy spring force versions. Thread inspected with go/no-go. Also supplied as housing-only for customer spring and ball assembly.
12L14 · SS303 · BrassGet Quote
FMS-009
PINS / 009
Bushings
Precision bore bushings and linear bushings, H7 bore, OD/ID concentricity ≤0.005 mm. Oil groove, flange, and press-fit OD options. Bronze (self-lubricating), free-machining steel (plated), and SS316 (corrosion-resistant) versions.
Bronze · 12L14 · SS316Get Quote
FMS-010
PINS / 010
Precision Sleeves
Precision sleeves and tube spacers, tight OD/ID tolerance (h7/H7), Ra ≤0.4 μm bore. Length tolerance ±0.01 mm for axial spacing control. End faces ground parallel ±0.005 mm. Black oxide or nickel plate for corrosion protection.
12L14 · SS303 · BrassGet Quote
Materials: 1215 · 12L14 · GCr15 · SS303 · SS316 · Bronze · BeCu · Brass
Request All 6 →Precision threaded parts, threaded connectors, adapter connectors, and nozzle seats where thread quality and bore accuracy determine the function of the assembled system. Thread tolerance class 4H/4h for instrument and medical precision applications; 6H/6g for general purpose. All threaded parts inspected with go/no-go gauges. Nozzle orifice diameter tolerance ±0.002 mm; bore surface Ra ≤0.1 μm polished for consistent flow coefficient.
FMS-014
THREADED / 014 — FEATURED
Nozzle Seats
Precision nozzle seats and injection nozzle bodies for fluid handling, pneumatic dispensing, and spray systems. Internal orifice bore tolerance ±0.002 mm — the specification that determines flow coefficient and spray pattern consistency. Bore surface Ra ≤0.1 μm achieved by precision boring followed by lapping or superfinishing — not simply drilling and reaming. Seat cone angle tolerance ±0.1° for valve seat sealing. External thread for nozzle body installation in manifold: 6g thread class with thread form inspected by optical comparator. Available in 12L14 (standard), SS316L (corrosive fluids), and PEEK (chemical process) versions. Custom orifice sizes from Ø0.1 mm upward.
12L14 · SS316L · PEEK · Titanium
Get Quote
FMS-011
THREADED / 011
Precision Threaded Parts
High-precision threaded components with tight thread form tolerance — thread pitch tolerance, flank angle, and minor/major diameter all controlled. Class 4H/4h for instrument and medical; 6H/6g general purpose. Optical comparator inspection of thread profile. Full thread run-out checked.
12L14 · SS303 · Ti · BrassGet Quote
FMS-012
THREADED / 012
Threaded Connectors
Small-diameter threaded connector fittings for pneumatic, hydraulic, and instrument piping. Metric, NPT, BSP, and G-thread options. Hex body for wrench engagement. Sealant or O-ring groove machined integral. All threads go/no-go inspected.
12L14 · SS303 · BrassGet Quote
FMS-013
THREADED / 013
Adapter Connectors
Thread-to-thread and thread-to-push-fit adapter connectors. Both thread features turned coaxially in single chuck — coaxiality ≤0.005 mm between thread axes. Hex mid-body for torque application. Metric-to-imperial and NPT-to-BSP adapters available.
Brass · SS303 · 12L14Get Quote
FMS-015
THREADED / 015
Thread Insert Bodies
Precision threaded insert housing bodies and Helicoil-style thread repair inserts. External thread for press or loctite installation; internal thread for the desired repair thread class. Both threads inspected go/no-go. Knurled OD for press-fit retention torque.
SS303 · 12L14 · BrassGet Quote
Materials: 12L14 · SS303 · SS316L · Brass · PEEK · Ti Grade 2
Request All 5 →Swiss-type long shaft precision parts, small connecting posts, cylindrical standoffs, hex turned parts, and medical small hardware — specialist precision turned products requiring Swiss-type CNC lathes or specialist capabilities. Swiss-type turning achieves L/D >20:1 at Ø0.5 mm diameter. Medical hardware in SS316L, titanium Grade 2, and PEEK with passivation and electropolish per ISO 10993 and ASTM F136 requirements.
FMS-020
SWISS & SPECIAL / 020 — FEATURED
Swiss-Type Long Shaft Parts
Long slender precision shaft parts on Swiss-type (sliding headstock) CNC lathes — the process engineered specifically for parts where the workpiece diameter is too small relative to length for centre-and-tailstock turning without deflection. Achievable: Ø0.5 mm to Ø20 mm, L/D ratios exceeding 20:1, OD tolerance h7, Ra ≤0.4 μm, cylindricity ≤0.005 mm — all along the full shaft length. Conventional CNC turning on the same part would produce OD taper and ovality from workpiece deflection at L/D >5:1 that Swiss-type eliminates by supporting the workpiece at the cutting zone through the guide bushing. Materials: free-machining steel 1215, stainless 303 SE (non-magnetic), titanium Grade 2, brass, and aluminium. Applications: medical instrument spindles, watch movement components, connector contact shafts, precision instrument actuator rods.
1215 · SS303 SE · Ti Gr2 · Brass · Al
Get Quote
FMS-019
SWISS & SPECIAL / 019
Medical Small Hardware
Small precision turned hardware for medical devices and surgical instruments — needle hubs, trocar tips, endoscope component pins, implant screws, and instrument body inserts. SS316L or Ti Grade 2 with passivation or electropolish. Ra ≤0.4 μm standard; Ra ≤0.1 μm for implant-adjacent surfaces. ISO 10993 biocompatibility documentation available.
SS316L · Ti Gr2 · PEEKGet Quote
FMS-021
SWISS & SPECIAL / 021
Small Connecting Posts & Standoffs
PCB standoff posts, connecting columns, and cylindrical spacers. M2, M2.5, M3, M4 male-female thread. OD h8; height tolerance ±0.05 mm standard; ±0.01 mm precision. Hex or round body. Bulk quantities in anti-static packaging for ESD-sensitive PCB assembly.
12L14 · SS303 · Brass · AlGet Quote
FMS-022
SWISS & SPECIAL / 022
Hex Turned Parts
Six-sided hex-profile precision turned parts — hex standoffs, hex spacers, hex insert bodies, and hex shoulder bolts. Hex across-flats tolerance h9 for wrench engagement. Internal threads 4H/6H; external threads 6g. Brass, free-machining steel, stainless, and aluminium versions.
Brass · 12L14 · SS303 · Al6061Get Quote
Materials: 1215 · SS303 SE · SS316L · Ti Grade 2 · PEEK · Brass · Al6061
Request All 4 →Manufacturing Capability
What Precision Turned Parts Require
Beyond Standard CNC Turning
🔬
Swiss-Type Turning — L/D >20:1 Without Deflection
Swiss-type (sliding headstock) CNC lathes support the workpiece at the cutting zone through a guide bushing — eliminating deflection that conventional lathes cannot avoid at L/D >5:1. Ø0.5 mm at 10 mm length to OD h7 tolerance — impossible on conventional CNC.
⚗
Free-Machining Steel — 3× Better Surface Finish
1215 and 12L14 produce Ra ≤0.4 μm surface finish off the lathe without secondary grinding — due to short-chip sulphide and lead inclusions that prevent built-up edge on cutting tools. Equivalent 45# carbon steel requires grinding to achieve the same finish.
💎
Nozzle Orifice ±0.002 mm — Lapped Bore
Nozzle and orifice bores to ±0.002 mm diameter tolerance achieved by precision CNC boring followed by lapping or superfinishing. Ra ≤0.1 μm bore surface for consistent flow coefficient. Orifice sizes from Ø0.1 mm upward — below conventional drill capability.
🧲
SS303 SE — Non-Magnetic Free-Machining Stainless
SS303 SE (sulphur-enhanced) combines the machinability advantage of free-machining grades with austenitic stainless steel corrosion resistance. Non-ferromagnetic — safe for precision sensor mounts and medical parts where magnetic interference must be eliminated.
🏥
Medical Hardware — ISO 10993 Documentation
Small medical turned parts in SS316L and Ti Grade 2 with passivation (ASTM A967) or electropolish (Ra ≤0.4 μm). ISO 10993 biocompatibility framework documentation available. Material certificates with heat number and chemical composition for every medical lot.
📦
Plating — XRF Thickness Verification on Critical Parts
Gold, tin, nickel, and hard chrome plating with XRF (X-ray fluorescence) plating thickness measurement on critical medical and aerospace terminal and connector parts. Plating specification is written into the part order — not assumed from process control alone.
Precision Specifications
Tolerances by Part Type — Precision Turned Parts
📐
Dimensional Tolerances
OD Standard
h6 / h7
Bore (H)
H7 / H8
Cylindricity (Pin)
≤0.002 mm
OD/Bore Concentricity
≤0.005 mm
Thread Class Std
6H / 6g
Thread Class Prec.
4H / 4h
Surface Finish
Ra ≤0.4 μm
Nozzle Orifice
±0.002 mm
🔬
Material & Process Reference
Swiss Min OD
Ø0.5mm
Swiss-type CNC. L/D >20:1. h7 tolerance along full shaft length.
Free-Mach Finish
Ra ≤0.4μm
1215/12L14 turned surface — no grinding required for Ra ≤0.4μm.
Lapped Bore
Ra ≤0.1μm
Nozzle orifice and contact pin barrel lapped to Ra ≤0.1μm.
Gold Plate
0.1–0.5μm
Over Ni barrier. XRF verified on medical and aerospace orders.
Quality System
ISO 9001
ISO 9001:2015. Medical lot traceability and material cert standard.
MOQ
1 pc
Prototype to 50,000+ piece production. Volume pricing from 50 pieces.
Surface Treatments
Plating & Finishing for Small Precision Parts
All plating specified to net finished dimensions — plating thickness allowance confirmed at DFM stage before machining.
🥇
Gold Plating
0.1–0.5 μm gold over 2–5 μm nickel barrier. Low and consistent electrical contact resistance for signal connectors, test probe pins, and precision terminals. XRF thickness verification on medical and aerospace orders.
TerminalsContact Pins
🔘
Nickel Plating
Electrolytic bright nickel 5–15 μm or electroless nickel 25–50 μm on free-machining steel. Corrosion protection, solderable surface, and hardness (~500 HV EN). Standard base coat under gold plating for connector bodies.
Steel ConnectorsBase layer
🔩
Hard Chrome
Hard chrome 10–30 μm, hardness 900–1200 HV, Ra ≤0.1 μm post-grind. Maximum wear resistance for contact pins, plunger shafts, and precision shafts in abrasive environments. Chromium-free alternatives available on request.
Contact PinsPlungers
🪙
Tin Plating
Bright tin 5–15 μm for solderability on terminal bodies and connector pins. Tin-silver alloy (Sn96Ag4) for lead-free applications. RoHS compliant. Low contact resistance for crimped and soldered electrical contacts.
TerminalsRoHS
🔲
Black Oxide
Hot black oxide for mild corrosion protection with zero dimensional change (<1 μm). Preserves h6/h7 tolerance on precision pins, shafts, and connectors. Standard for general workshop precision turned parts requiring corrosion resistance without dimensional penalty.
Precision PinsShafts
⚗
Passivation (SS)
Citric acid passivation per ASTM A967 for SS303, SS316L, and Ti parts. Restores passive oxide layer for maximum corrosion resistance. Required for all medical and food-grade turned parts in stainless or titanium. Certificate included.
Medical SSTitanium
✦
Electropolish (EP)
Electropolish on SS316L medical hardware to Ra ≤0.4 μm. Removes micro-roughness and embedded contaminants from machined surface. Creates smooth, bio-burden-resistant surface for medical device components adjacent to patient tissue or body fluid.
Medical SS316LBio-burden
Our Advantage
Why Engineers Specify Our Precision Turned Parts
Swiss
Swiss-Type Turning — Ø0.5mm, L/D 20+
Dedicated Swiss-type CNC lathes for long slender parts that conventional CNC cannot turn without deflection. Ø0.5 mm diameter at L/D 20:1 to h7 tolerance — the process that makes medical instrument shafts and connector contact pins achievable as single-operation parts.
Ra
Free-Machining Steel — Ra ≤0.4μm Without Grinding
1215 and 12L14 produce Ra ≤0.4 μm surface finish off the lathe — no secondary grinding. This means consistent surface finish across thousands of parts, not dependent on grinding setup and dressing cycles. The surface finish advantage that free-machining steel provides is the single biggest reason to specify it for precision turned parts.
XRF
Plating — XRF Thickness Verified
Gold and tin plating thickness measured by XRF spectrometry on critical medical and aerospace terminal orders. Not assumed from process control alone — measured and reported. Plating specification is written into the order, not left to the plating subcontractor to interpret.
1 pc
Prototype to 50,000 Pieces — Same Quality
Single prototype to high-volume production batch — same Swiss-type CNC quality, same go/no-go thread inspection, same plating specification, same documentation. Volume pricing starts at 50 pieces. No "volume only" restriction on precision turned parts.
Frequently Asked Questions
Precision Turned Parts — Common Questions
Technical questions about materials, tolerances, Swiss-type turning, plating, and ordering for precision turned parts.
Free-machining steel (易切削钢) contains added sulphur (1215), lead (12L14), or bismuth that produce short chips during cutting — preventing the built-up edge that degrades surface finish on standard carbon steel. The result: Ra ≤0.4 μm surface finish off the lathe without secondary grinding, cutting speeds 3× faster than 45#, and consistent dimensional tolerance across large production batches. These properties make free-machining steel the standard choice for pins, connectors, threads, and all small precision turned parts where surface finish and consistency at production volume are critical.
On standard CNC turning centres: minimum practical OD is approximately Ø2 mm. On Swiss-type CNC lathes (走芯机 / sliding headstock lathes): minimum OD is Ø0.5 mm with L/D ratios exceeding 20:1 — the workpiece is supported at the cutting zone through a guide bushing, eliminating deflection that conventional lathes cannot prevent at small diameters and high L/D ratios. Applications include medical instrument spindles, connector contact pins, and Swiss watch components.
OD: h6 (±0.005–0.008 mm) standard; h7 for general precision. Bore: H7 standard for bushings. Thread: 4H/4h (precision, instrument, medical); 6H/6g (general purpose). Surface finish: Ra ≤0.4 μm standard turned; Ra ≤0.2 μm polished; Ra ≤0.1 μm lapped (nozzle orifice, contact barrel). Cylindricity: ≤0.002 mm on contact pins. OD/bore concentricity: ≤0.005 mm on bushings and sleeves. Nozzle orifice: ±0.002 mm diameter.
For free-machining steel: nickel plating (electrolytic or electroless) for corrosion protection and solderable surface; gold plating (0.1–0.5 μm over Ni) for low contact resistance electrical signals; tin plating (Sn or SnAg) for RoHS-compliant solderability; hard chrome for wear-resistant contacts Ra ≤0.1 μm; black oxide for mild protection, zero dimensional change. For stainless/titanium: passivation per ASTM A967; electropolish for medical Ra ≤0.4 μm. All plating applied to net finished dimensions — thickness allowance confirmed at DFM stage.
Yes. Swiss-type (sliding headstock) CNC lathes allow turning at L/D ratios exceeding 20:1, minimum Ø0.5 mm in free-machining steel, stainless SS303 SE, brass, and titanium. OD tolerance h7 maintained along the full shaft length — impossible on conventional CNC where workpiece deflection degrades tolerance beyond L/D 5:1. Applications: medical instrument spindles, connector contact shafts, watch components, and precision instrument actuator rods.
Brass C36000 is standard for electrical terminals and connector bodies — self-lubricating thread quality, good electrical conductivity, and excellent plating adhesion for gold and tin. 12L14 with nickel plating for higher-strength connector bodies. BeCu for spring contact elements requiring highest conductivity. SS303 SE for corrosion-resistant connectors. SS316L for medical connector bodies with passivation. Plating selection: gold for low-contact-resistance signal; tin for solderability; nickel as barrier under gold.
MOQ is 1 piece for prototypes. Production economics become favourable at 50–100 pieces for Swiss-type parts. Lead times: simple turned parts without secondary operations: 5–7 working days. Parts with cross-drilling, milling, heat treatment: 7–14 working days. Production batches 1,000+ pieces: 10–20 working days. Volume pricing applies from 50 pieces. Exact lead time quoted in every quotation response.
Yes — we accept customer-supplied bar stock, wire, or billet with a material certificate confirming grade and dimensions. Supply 10–15% excess material over nominal part count for setup scrap and material defects. We also accept customer-supplied cut lengths. For medical, aerospace, and safety-critical parts, we recommend using our certified material stock for full mill-certificate-to-finished-part traceability rather than customer-supplied material, unless the customer has a specific qualified material source.
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Send Your Drawing.
Get a Quote.
Every enquiry includes a DFM review — tolerance feasibility, material confirmation, and process approach confirmed before production starts. MOQ 1 piece.
24hr
Quote Response
MOQ 1
Prototypes OK
ISO
9001:2015
📐
DFM Review on Every Enquiry
Tolerance feasibility, fixturing strategy, and material confirmation. Specific, actionable feedback — not generic pushback.
🎯
First Article Inspection — Standard
FAI report on every new run. Material certs and surface treatment certs included with every shipment.
🔄
Same Process: Prototype to Production
Process plan from your prototype applies to production batches. No re-qualification when you scale.
⚙
3 / 4 / 5-Axis CNC + Turning
Complex structural parts, shafts, housings, and transmission components. Metals and engineering plastics.
ISO 9001:2015
3/4/5-Axis Milling
CNC Turning
CMM Inspection
Global Delivery