★ Flagship · Ceramic Structural Parts

Silicon nitride shaft rods,
precision to ±0.01mm.

High-precision Si₃N₄ ceramic shaft rods for high-speed CNC spindles, pump shafts, and turbo-machinery. 60% lighter than steel, hardness 78 HRC, zero magnetic signature, and lubricant-free capable. Standard Ø3–100mm; custom dimensions to OEM drawing.

±0.01mm

Ground Tolerance

HRC 78

Hardness

60%

Lighter than Steel

Non-magnetic

Zero Mag. Sig.

Request a Quote →Download Datasheet ↓

Si₃N₄ Shaft Rods · At a Glance

MaterialSi₃N₄

Density3.2 g/cm³

HardnessHRC 78

DiameterØ 3–100mm

Tolerance±0.01mm ground

MagneticNon-magnetic

Sample Lead Time14 d

Certifications & Standards

ISO 9001IATF 16949CERoHS · REACHUL Recognized

01 · Size Ranges

Three shaft rod diameter ranges.

All three ranges share the same Si₃N₄ material. Choose based on your bore diameter and bearing interface requirement.

★ Highest Volume

Small Diameter

Ø 3–20 mm · precision class

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Small diameter shaft — close-up

DiameterØ 3–20mm

Tolerance±0.01mm

Surface FinishRa ≤0.2µm

Straightness≤0.01/100mm

HardnessHRC 78

Use: CNC spindle shafts · dental turbines · precision instruments

Medium Diameter

Ø 20–50 mm · industrial class

⚙️

Medium diameter shaft

DiameterØ 20–50mm

Tolerance±0.02mm

Surface FinishRa ≤0.4µm

Straightness≤0.02/100mm

HardnessHRC 78

Use: Pump shafts · compressor shafts · chemical equipment

Large Diameter

Ø 50–100 mm · heavy duty

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Large diameter shaft

DiameterØ 50–100mm

Tolerance±0.05mm

Surface FinishRa ≤0.8µm

LengthUp to 600mm

ApplicationTurbo-machinery

Use: Turbo-machinery · large pump shafts · custom structural

All Si₃N₄ shaft rods: density 3.2 g/cm³ · non-magnetic · lubricant-free · operating temp −40 to +800°C.

02 · Datasheet & Downloads

Drawings, datasheets, and certs.

Everything your engineering and procurement teams need. Email engineering@ceramitell.com for STEP/DWG files.

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Product Datasheet

PDF · full specifications

Download PDF →

📐

2D / 3D Drawings

STEP · DWG · PDF · on request

Request files →

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Certification Files

ISO 9001 · CE · RoHS · REACH

Request scans →

03 · Certifications & Compliance

Certified for global markets.

All products shipped with certificate of conformity. Additional certification documentation available for OEM qualification programs.

ISO

ISO 9001 quality management system. Full lot traceability and PPAP-level documentation for OEM programs.

Quality System

CE marking for European Union shipments. Declaration of Conformity provided with CE-marked products.

European Union

RoHS

RoHS and REACH compliant. Material declarations available for restricted-substance compliance screening.

EU · Global

IATF

Produced in an IATF 16949 / ISO 9001 facility. PPAP documentation available for automotive-adjacent applications.

Quality System

04 · Get a Quote

Request a quote for Si₃N₄ shaft rods.

Tell us your specification, dimensions, grade, and annual volume. Our engineers reply within one business day with a quote and matched datasheet.

Free samples, 48-hour dispatch on stock items — no MOQ.
Custom to drawing: DFM review in 48h, prototype in 14 days.
Direct manufacturer pricing — no trading layer.
ISO 9001 certified — full material certs with every shipment.

Free Quote · Reply in 24h

Request a quote

Specify diameter (OD), length, tolerance, and annual volume.

05 · Engineering FAQ

The questions we get most.

Why Si₃N₄ over steel for shaft rods?

Si₃N₄ is 60% lighter than steel, has zero magnetic signature, and can run lubricant-free. At high speeds (>40,000 RPM), the lighter shaft reduces centrifugal loads on bearings by 60%, extending bearing life 3× or more.

What is the tightest tolerance?

Ground ceramic: ±0.01mm on diameter and straightness. Ra ≤0.2µm surface finish on precision class. CMM inspection report with every production shipment.

Can you match my existing steel shaft OD and length?

Yes — send drawing (STEP/DWG) or just specify OD, length, and tolerance. We confirm material capability and quote within 48 hours.

What is the minimum order quantity?

Prototypes: no MOQ (single-unit quotes available). Production: 50 units minimum for standard dimensions. Volume pricing from 500 units.

Operating temperature range?

Si₃N₄ shaft rods operate continuously to 800°C. Ambient range −40 to +85°C. Suitable for high-temperature furnace, autoclave, and process equipment applications.

Do you stock standard sizes?

Common OD sizes (Ø5, Ø6, Ø8, Ø10, Ø12, Ø16, Ø20mm) in lengths to 300mm are held in stock. Non-stock: 14-day lead time.

06 · Related