Micro Duplex Spur Gear Shaft | m0.3 Module, 12mm Overall Length | Aerospace Grade Precision

MH Micro Duplex Spur Gear Shaft is an ultra-compact, high-precision integrated transmission component, engineered for the most demanding miniature motion control applications. Featuring a 12mm overall length, m0.3 fine pitch module, and one-piece duplex gear design, this part delivers zero assembly backlash, exceptional coaxiality, and consistent performance in high-reliability systems.

Backed by 70 years of aerospace manufacturing heritage, AS9100 certification, and in-house CNAS-accredited inspection capabilities, we produce these micro duplex gear shafts to meet ISO 5~ISO 6 precision standards-surpassing the requirements of aerospace, medical, and precision instrument industries. As a trusted OEM supplier to global industrial leaders, we guarantee every unit meets the strictest quality specifications for durability and precision.

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Key Features & Benefits

✅ Integrated Duplex Gear DesignOne-piece machining of two m0.3 module spur gears eliminates assembly errors, ensuring coaxiality ≤ 0.002mm and radial runout ≤ 0.005mm for smooth, quiet, and efficient operation.

✅ Ultra-Miniature Compact Form Factor12mm overall length with optimized shaft geometry, perfectly suited for space-constrained applications where size and weight are critical design factors.

✅ Aerospace-Grade Precision (ISO 5 ~ ISO 6)Manufactured with Gleason 350GMS high-precision gear machining equipment, with tooth profile error controlled within 0.003~0.006mm-ideal for high-precision positioning and motion control.

✅ Superior Rigidity & DurabilityCrafted from high-performance alloy steel with specialized heat treatment, ensuring maximum rigidity despite its ultra-small size, preventing deformation during high-speed operation.

✅ Strict Quality Control100% inspection via high-magnification microscopes and Zeiss CMM, with SPC process control to ensure consistent precision-even for small-batch custom orders.

✅ Customizable OEM SolutionsFlexible customization of gear parameters, shaft dimensions, material selection, and surface treatments to match your exact application requirements.

Technical Specifications

Parameter	Standard Value	Custom Options
Overall Length	12mm	Custom lengths available (8mm~20mm)
Module (m)	0.3	m0.2 ~ m0.4 available
Gear Type	Integrated Duplex Spur Gear	Micro helical duplex gear available
Precision Grade	ISO 5 ~ ISO 6 (DIN 5 ~ DIN 6)	ISO 4 for ultra-high-precision requirements
Material	20CrMnTi Alloy Steel	304/316 Stainless Steel, Custom Aerospace Alloys
Hardness	HRC 55-62 (Case Hardened)	HRC 28-32 (Soft Annealed) available
Surface Treatment	Nitriding	Black Oxide, Hard Chrome Plating, Custom Coatings

Core Applications

This micro duplex spur gear shaft is designed for ultra-compact, high-reliability scenarios, including:

Aerospace: Miniature aerospace actuators, avionics transmission systems, precision aerospace components

Precision Instruments: Medical devices, testing equipment, high-precision positioning systems

Micro Machinery: Miniature gearboxes, small motors, drone actuators

Industrial Automation: Miniature robotic actuators, precision transmission mechanisms

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Manufacturing Difficulty & Process Control

This micro duplex spur gear shaft is classified as an ultra-high-precision aerospace-grade component, with significant manufacturing challenges that require strict process control and specialized equipment:

Ultra-Micro Machining Barriers

The m0.3 fine pitch module results in extremely thin tooth profiles (tooth thickness < 0.5mm), requiring custom ultra-precision micro cutting tools with strict tolerances. Tool wear is 3~5x higher than standard gears, and even minor tool deflection will cause tooth profile errors beyond specification.

Tight Tolerance Control

The ISO 5~ISO 6 precision standard requires tooth profile error ≤ 0.006mm, coaxiality between the two gears ≤ 0.002mm, and radial runout ≤ 0.005mm. All machining must be completed in a constant-temperature workshop (±0.5°C) to eliminate thermal expansion/contraction errors.

Heat Treatment Deformation Control

The ultra-compact structure makes the part extremely sensitive to heat treatment deformation. Special low-distortion case hardening processes are required to control deformation within 0.003mm, otherwise the tooth profile will be permanently damaged.

Zero-Defect Inspection Requirements

Conventional metrology tools cannot measure micron-level errors. 100% full inspection requires high-magnification digital microscopes, Zeiss ultra-precision CMM, and Gleason gear inspection systems, with a 2x longer inspection cycle than standard gears.

Rigidity & Process Stability

The thin shaft and micro tooth structure are prone to clamping deformation during machining. Special custom fixtures and optimized cutting parameters are required to avoid part damage, with a typical mass production yield of 75~85% (vs. 95% for standard industrial gears).

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Critical Considerations for Procurement Engineers

Beyond basic parameters, procurement teams for aerospace, medical, and precision instrument applications focus on these non-negotiable factors:

Certifications & Traceability

For aerospace gear, full compliance with AS9100 is necessary, and for all applications with complete material traceability (material certificates, heat treatment reports, batch inspection records) is necessary. Every part must be fully traceable from raw material to final delivery, a mandatory requirement for aerospace and medical projects.

Batch Consistency & Yield Rate

Procurement teams prioritize suppliers with proven stable yield rates for micro duplex gears, to avoid production line delays caused by high scrap rates. Our process control ensures consistent performance across small-batch and mass production orders.

Customization & Lead Time Flexibility

Support for fast prototyping (3~5 days) and flexible production scheduling, to match the customer's product development cycle. We offer dedicated engineering support for custom gear parameters, material changes, and special surface treatments.

Cost of Ownership & Long-Term Reliability

Beyond unit price, the part's service life, noise performance, and failure rate directly impact the customer's product reliability. Our aerospace-grade processing ensures 2~3x longer service life than standard industrial gears, reducing total cost of ownership.

Quality Control & After-Sales Support

100% full inspection before delivery, with formal inspection reports for every batch. We provide technical support for part matching, assembly guidance, and after-sales quality issues, to ensure seamless integration into the customer's system.

Supply Chain Stabilit

yLong-term material supply agreements and flexible production capacity, to avoid supply chain disruptions. We maintain safety stock for your long term demand models, to support urgent order requests.

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