Custom Precision Shaft Machining to drawing
We CNC-machine stepped shafts, spline shafts, eccentric shafts, and multi-feature shaft assemblies to tolerances as tight as ±0.002 mm — from Ø1 mm miniature shafts to Ø150 mm heavy-duty shafts, all in-house.
mm achievable tolerance
mm diameter range
μm surface finish (honed)
Certified quality system
Every Shaft Configuration We Produce
Shafts are one of the most specification-sensitive parts in precision engineering — a bearing journal that’s 3 microns oversize creates interference; a spline that’s 5 microns undersize creates play. We understand that, and we build our processes around it.
If your shaft has cross-drilled holes, eccentric features, flats, or engraved markings, we handle those in the same setup — no re-chucking, no accumulated error.
Stepped Shafts
Multiple diameter steps with precise shoulder locations and undercut geometry. Common in gearbox input/output shafts, motor shafts, and precision spindles. We control step runout and shoulder squareness to within ±0.003 mm.
Spline Shafts
Involute and parallel key splines machined to DIN 5480, ANSI B92.1, or customer-defined profiles. We mill or hobble the spline zone during the same turn-mill cycle to maintain coaxiality between spline and journal diameters.
Eccentric & Cam Shafts
Off-center diameters, cam profiles, and eccentric journals that require precise phase relationships. Critical in pumps, compressors, indexing mechanisms, and medical device actuators. Eccentricity verified by CMM.
Lead Screw & Ball Screw Shafts
Precision thread forms (ACME, trapezoidal, ball-screw profiles) on shaft bodies with tight pitch accuracy and flank angle control. Used in linear actuators, CNC axis drives, and medical imaging systems.
Hollow & Through-Bore Shafts
Center-bored shafts for fluid or electrical pass-through, or for weight reduction in aerospace and robotics applications. Bore concentricity and wall thickness uniformity are verified on CMM.
Multi-Feature Shafts
Shafts combining turning, milling, drilling, keyways, cross-holes, and thread features — all completed in a single turn-mill setup. This is where our Swiss-type and multi-axis machines deliver real advantage over conventional shops.
Miniature & Micro Shafts
Ultra-slender shafts from Ø1 mm, machined on CITIZEN A16 Swiss-type machines with guide bushing support. Used in pogo pin contacts, camera actuators, medical catheter drives, and precision instrument pivots.
Shaft Assemblies & Sub-Assemblies
We machine and supply complete shaft sub-assemblies — including mating nuts, retaining rings, and precision spacers — reducing your incoming inspection and assembly time. All components from one source, one quality record.
The Buyers Who Come to Us — and Why
Custom precision shafts are specified by mechanical engineers and procurement engineers who already know what they need. We don’t sell — we deliver.
- You have an existing drawing or 3D model and need a supplier who can actually hold the tolerance.
- Your current supplier is failing on dimensional repeatability across production lots.
- You need multi-feature shafts done in fewer setups to eliminate inter-op error.
- Your program requires IATF 16949 or AS9100D traceability and documentation.
- You need prototype quantities fast and production ramp-up within the same relationship.
Can you machine shafts that require both spline and threaded features?
Yes. Our turn-mill centers handle live milling, threading, and spline cutting in a single setup. The key advantage is coaxiality — spline pitch diameter, bearing journals, and thread axis share one datum, eliminating fixture transfer error.
How do you verify shaft straightness and runout on long shafts?
We use steady rests during machining to prevent deflection on shafts with L/D > 5:1. Post-machining, runout is verified between centers on a CMM with ±0.001 mm accuracy. Straightness is measured at multiple datum points along the shaft length.
What surface finish can you hold on bearing journal diameters?
Standard finish is Ra 0.4–0.8 μm from turning. For bearing fits, we follow up with cylindrical grinding or precision honing to Ra 0.2 μm or better. Form accuracy (roundness, cylindricity) is held to within 0.002 mm on journal zones.
How a Shaft Order Moves Through Our Facility
DFM Review
We review every shaft drawing for datum structure, tolerance stack-up, and machinability. We flag conflicts before quoting — not after first article failure.
Process Planning
Machine selection, fixturing strategy, cutting sequence, and QC control plan are defined before production. Steady rests, live centers, and gauge selection are specified per shaft type.
First Article
Full CMM dimensional report on the first produced shaft. Every callout on your drawing gets a measured value. Parts ship only after your written approval.
Production with IPQC
In-process gauging at defined intervals. Critical shaft features (OD, runout, keyway width) are checked every N pieces per the control plan. SPC data available on request.
Final Inspection & Docs
OQC sampling or 100% inspection per AQL. CMM report, material cert, CoC, and plating/finish reports ship with every lot. Lot codes traceable to raw material heat number.
How a Shaft Order Moves Through Our Facility
We select the right machine for each shaft based on diameter, L/D ratio, feature complexity, and required tolerance. Here is our dedicated shaft machining equipment:
Machine | Type | Ø Range | Tolerance | Qty |
|---|---|---|---|---|
CITIZEN A20 | Swiss CNC Turn-Mill | Ø0.5–25 mm | ±0.005 mm | 15 |
CITIZEN A16 | Swiss CNC Turn-Mill | Ø0.5–15 mm | ±0.005 mm | 4 |
CITIZEN BNC 40# | Fixed-Head Turn-Mill | Ø5–120 mm | ±0.005 mm | 4 |
MAZAK Turn-Mill | Multi-axis Turn-Mill | Up to Ø120 mm | ±0.005 mm | 18 |
TSUGAMI B206 | CNC Swiss Lathe | Ø1–20 mm | ±0.005 mm | 20 |
YM LM-06Y 46# | Fixed-Head Turn-Mill | Ø5–150 mm | ±0.005 mm | 2 |
MAZAK HCN5000L | Horizontal Machining Center | — | ±0.005 mm | 2 |
Nomura Automatic Lathe | Swiss Auto Lathe | Ø1–6 mm | ±0.005 mm | 4 |
Secondary Operations (In-House)
Abrasive Honing
5 machines — bore & OD finishing to Ra ≤0.2 μm
4-Axis & 5-Axis Milling
80+ rotary/indexing tables — keyways, flats, cross-features
Centerless Grinding
OD size control for long shafts
Abrasive Honing
5 machines — bore & OD finishing to Ra ≤0.2 μm
4-Axis & 5-Axis Milling
80+ rotary/indexing tables — keyways, flats, cross-features
Centerless Grinding
OD size control for long shafts
Shaft-Specific Fixturing Practices
Long shafts deflect under cutting forces. Our standard protocol for shafts with L/D > 5:1 includes steady rest support, reduced depth-of-cut on finish passes, and in-process runout checking between operations. We don’t leave straightness to chance.
Tolerance & Fit Capabilities
We specify tolerance class by feature type — not a single blanket number. Bearing journals get tighter control than non-functional diameters. That’s how precision shaft machining should work.
Roundness ≤ 0.002 mm on bearing zones
Roundness ≤ 0.002 mm on bearing zones
Roundness ≤ 0.002 mm on bearing zones
Roundness ≤ 0.002 mm on bearing zones
Feature | Standard Tolerance | Achievable |
|---|---|---|
OD — bearing journal | ±0.005 mm | ±0.002 mm |
OD — non-functional | ±0.01 mm | ±0.005 mm |
Length / step location | ±0.01 mm | ±0.005 mm |
Keyway width | JS9 / P9 fit | Custom |
Thread pitch diameter | 6g / 6H class | 4h / 4H class |
Spline — major Ø | ±0.01 mm | ±0.005 mm |
Bore concentricity | ±0.005 mm | ±0.003 mm |
Surface finish — turned | Ra 0.8 μm | Ra 0.4 μm |
Surface finish — honed | Ra 0.4 μm | Ra 0.2 μm |
“Achievable” values require dedicated setup and gauging verification. Discuss during DFM review — we will confirm feasibility before quoting.
What We Machine Shafts From
Material selection directly affects machinability, surface finish quality, and wear life. We work with the full range of shaft materials and will advise on grade selection during DFM if you’re still deciding.
Material | Grades | Typical Shaft Applications |
|---|---|---|
Stainless Steel | 303, 304, 316L, 17-4PH, 440C | Medical device shafts, food equipment, corrosion-critical applications |
Carbon & Alloy Steel | 1045, 4140, 4340, 8620 | Gearbox shafts, drive shafts, high-torque transmission applications |
Aluminum | 6061-T6, 7075-T6, 2024 | Aerospace and robotics shafts where weight reduction is critical |
Titanium | Grade 5 (Ti-6Al-4V), Grade 2 | Aerospace, medical implant tools, high-strength lightweight shafts |
Brass & Copper | C360, C932, C260 | Electrical connectors, valve stems, high-conductivity pivot shafts |
Tool Steel | D2, H13, A2 | High-wear die shafts, forming pins, precision punch bodies |
Free-Cutting Steel | 12L14, 1215, SUM22L | High-volume production shafts where surface finish and cycle time matter |
On exotic alloys
We machine Inconel 625/718, Hastelloy, and duplex stainless on request. These materials require specialized tooling and cutting parameters — lead time and pricing differ from standard alloys. Contact us with your drawing for a specific assessment.
Surface Finishing for Shafts
Surface Finishing | |
|---|---|
Cylindrical Grinding | OD size / Ra ≤0.2 μm |
Abrasive Honing | Bore / OD Ra ≤0.2 μm |
Electropolish (EP) | UHP / semiconductor shafts |
Electroless Nickel | Wear & corrosion protection |
Hard Chrome Plating | High-wear shaft surfaces |
Black Oxide | Steel shafts — mild corrosion protection |
Passivation | Stainless steel — ASTM A967 |
Anodizing (Type II / III) | Aluminum shafts |
Zinc Plating | Carbon steel corrosion protection |
Nitrocarburizing (Tenifer) | Surface hardening for wear resistance |
Note on Post-Plating Dimensions
Electroless nickel and chrome plating add material to the shaft OD. We machine pre-plate diameters to compensate for the specified plating thickness, so your finished shaft lands on the correct size. Confirm plating thickness spec with us at quoting stage.
What We Machine Shafts From
Material selection directly affects machinability, surface finish quality, and wear life. We work with the full range of shaft materials and will advise on grade selection during DFM if you’re still deciding.
01
Semiconductor Equipment
Wafer handler pivot shafts, process gas valve stems, and robot arm drive shafts for fab automation. Require ultra-clean surfaces, electropolish or EP finish, and dimensional verification to semiconductor-level GD&T callouts.
02
Aerospace & Defense
Flight-critical actuator shafts, landing gear components, and precision pivot pins — all produced under AS9100D with full material traceability and first article inspection documentation.
03
Automotive
IATF 16949 certified production of transmission input/output shafts, EV motor shafts, sensor shafts, and precision pivot components for suspension and braking systems.
04
Medical Devices
Surgical instrument drive shafts, endoscope articulation shafts, catheter delivery mechanisms, and implant tool spindles — all requiring ultra-fine surface finish, dimensional repeatability, and biocompatible material certs.
05
Industrial Robotics
Joint drive shafts, harmonic drive input shafts, delta robot arm pivots, and SCARA robot forearm shafts. High repeatability and coaxiality are critical — positional errors accumulate across joints.
06
Precision Instruments & Optics
Ultra-precise pivot shafts, rotary encoder input shafts, and galvanometer pivot pins where angular repeatability is measured in arc-seconds. We’ve supplied RED Digital Cinema and precision metrology customers.
How We Verify Every Shaft We Ship
Material selection directly affects machinability, surface finish quality, and wear life. We work with the full range of shaft materials and will advise on grade selection during DFM if you’re still deciding.
CMM Dimensional Verification
Mitutoyo CMM with ±0.001 mm accuracy verifies all critical shaft dimensions — OD, step locations, bore concentricity, runout, and positional tolerances of cross-features. CMM reports available for every lot.
In-Process Gauging
Critical shaft ODs are gauged every N pieces during production using air gauges and precision bore gauges. We don't wait for end-of-lot inspection to discover a drift — we catch it at the first deviated piece.
Full Documentation Package
Every shaft shipment includes: Certificate of Conformance, material test report (mill cert), full CMM dimensional report, surface finish report where specified, and plating/coating cert if applicable. All traceable to lot number.
Runout & Straightness Check
Long shafts are verified between centers for total runout. We use V-block + dial indicator for intermediate checks and CMM for final verification. Straightness is measured at minimum 5 points along shaft length for L/D > 5.
Optical & Visual Inspection
Rational 2D/2.5D optical systems verify thread pitch, spline profile, and surface feature geometry. RKE CCD automatic sorters used for high-volume lots to detect surface defects, burrs, and edge condition issues.
Material Verification
Seiko SII XRF analyzer verifies material composition and RoHS compliance. Hardness testing (Vickers) where heat treatment or surface hardening is specified. All raw material sourced with mill certificates.
Measurement Equipment Used for Shaft Inspection
Mitutoyo CMM (3-Coordinate)
Model 4078M-1211 · 400×800×200 mm
±0.001 mm · Japan
Mitutoyo Profiling / Contour
Surface & contour measurement
Roundness & cylindricity · Japan
Mitutoyo Micrometer Set
0–25 mm range · 30 units
±0.001 mm · Japan
Rational 2D / 2.5D System
CPJ-3025 / CDP-1018 · 4 units
±0.001 mm · China
Mitutoyo Roughness Meter
Model 178-560-01DC
±0.1 nm · Japan
Vickers Hardness Tester
Post heat-treat verification
±0.5 HV
RKE CCD Auto-Sorter
RK-1500 / RK-2201 · 6 units
±0.002 mm · visual defect detection
Seiko SII XRF Analyzer
SEA1000A · RoHS substance testing
Japan · material certification
What Separates Us on Shaft Work
Single-Setup Multi-Feature Machining
Shafts with keyways, cross-holes, splines, and threads are machined in one turn-mill cycle. Every feature shares the same datum — no accumulated re-fixturing error, no inter-operation transfer tolerance stack.
Swiss-Type Capability for Slender Shafts
Guide-bushing support on our CITIZEN Swiss machines eliminates deflection on shafts with L/D up to 30:1. Conventional fixed-head lathes can’t hold tolerance on these geometries — we can.
Diameter Range from Ø1 to Ø150 mm
We cover the full shaft spectrum within one supplier relationship. Miniature encoder shafts at Ø1 mm and heavy-duty valve shafts at Ø150 mm — same quality system, same documentation, same point of contact.
Dual Certification — IATF & Aerospace
Most precision shaft suppliers hold one certification. We hold both IATF 16949 and AS9100D, which means your automotive and aerospace programs can be consolidated under one qualified source.
Honing for Bearing-Quality Finish
We don’t stop at turning. Our in-house abrasive and extrusion honing equipment brings bore and OD surfaces to Ra ≤0.2 μm with roundness ≤0.002 mm — the specification bearing manufacturers actually require.
DFM Partnership, Not Just Order Execution
If your shaft drawing has a tolerance that’s pushing the process, we tell you before we quote — not after first article failure. We suggest alternatives, explain the trade-offs, and document our recommendation. You decide.
Frequently Asked Questions
For shafts with L/D greater than 5:1, we use steady rest support during the finish turning pass to prevent deflection under cutting forces. On Swiss-type machines, the guide bushing provides support right at the cutting zone. After machining, we check total indicator runout (TIR) between centers using a precision surface plate and dial indicator for intermediate verification, and CMM for final dimensional sign-off. Runout values are recorded in the inspection report for every lot.
On our Swiss-type (CITIZEN A20, TSUGAMI B206) machines, maximum bar length is limited by machine travel — typically up to 200–300 mm finished length for small-diameter shafts. For larger-diameter shafts on fixed-head turn-mill centers, we can machine up to 500 mm length depending on diameter. If your shaft exceeds these envelopes, contact us — we can discuss turning between centers as an alternative process for very long shafts.
Heat treatment introduces distortion. Our standard approach for hardened shafts is to rough-machine, send for heat treatment or case hardening, then finish-grind or finish-hone to final size. We do not offer heat treatment in-house, but we coordinate with qualified sub-suppliers and verify hardness with our Vickers tester on return. Final dimensions are verified post-finishing. If your shaft requires tight OD tolerance after hardening, specify this at the quoting stage so we can build the heat treat allowance into the machining sequence.
We work with prototype quantities as low as 5–10 pieces for new programs, which covers first article inspection and engineering validation. For high-volume production on Swiss-type machines, typical lot sizes range from 1,000 to 100,000+ pieces. There is no hard minimum — pricing simply reflects tooling and setup amortization across the order quantity. We'll provide per-unit pricing at multiple quantity tiers so you can optimize your inventory strategy.
Yes. Our turn-mill machines support metric (M), Unified (UNC/UNF), NPT, BSPT, ACME, and trapezoidal thread forms. Thread milling on live-tooled turn-mill centers gives us flexibility on thread class — from standard 6g to tighter 4h for precision fits. We verify thread gauging with Go/No-Go gauges and optical measurement for pitch accuracy.
Yes, material test reports (mill certificates) are standard documentation with every order. For aerospace programs, certificates include heat number, chemical composition, and mechanical properties per the applicable spec (e.g., AMS, ASTM). For medical device shafts, we can provide documentation compatible with FDA 21 CFR Part 820 quality records. All material is sourced from traceable supply chains — no unknown-origin bar stock.
We accept 2D drawings in PDF, DXF, and DWG formats, and 3D CAD files in STEP, IGES, and Parasolid format. STEP is preferred for complex shaft geometries with multiple features — it eliminates interpretation ambiguity on feature location and profile. For first-article orders, the 2D drawing with full GD&T callouts is the reference document that governs inspection, regardless of 3D model. If you have only a physical shaft sample (reverse engineering), contact us — we can arrange dimensional capture.
Laser marking and dot-peen marking for part identification, lot codes, or serial numbers can be arranged through our partner network. For aerospace traceability requirements, we ensure marking specifications (depth, character height, location) comply with AS9100D requirements. Specify marking requirements at the quoting stage so we can include it in the process plan and cost estimate.
Send Us Your Shaft Drawing
We’ll review it for machinability, check the tolerance requirements against our process capability, and return a detailed quote within 24–48 hours. No obligation at the quoting stage.
- DFM review included at no charge
- Quote turnaround 24–48 hours
- Prototype quantities from 5 pieces
- IATF 16949 & AS9100D documentation available
- CMM reports and material certs with every shipment
- Ø1–150 mm · All common shaft alloys
