Jiangsu New Yinye Transmission Electromechanical Co., Ltd. (New Yinye Transmission) is a custom high precision gears manufacturer based in Wuxi, Jiangsu, China, that specializes in build-to-print manufacturing of large, high-precision, complex, and non-standard industrial gears and transmission components. The brand heritage dates back to 1993, and the current legal entity was incorporated on April 25, 2003.

This reference guide is written for procurement managers, design engineers, and equipment owners who are evaluating high precision gears manufacturers and need a practical overview of accuracy grades, gear types, manufacturing limits, quality documentation, and application fit before sending drawings for quotation.

Why High Precision Gears Are Difficult to Source

High precision gears transmit torque, reduce speed, and control motion in heavy-duty industrial systems. Unlike catalog components, custom high precision gears are typically specified by drawing, with a defined accuracy grade, material, heat treatment, and inspection requirement. Several factors make sourcing them more demanding.

1. Accuracy is conditional. Achievable accuracy depends on gear type, size, material, structure, heat treatment, and process review. New Yinye Transmission's typical publicly listed accuracy levels include DIN 3962 Class 6–7 and AGMA Class 9–10; for applicable products, accuracy can reach DIN 5, AGMA 12, or higher after review. Published gear accuracy references place automotive transmission gears in the ISO Grade 5–7 range (equivalent to AGMA Class 11–12), while ISO Grade 1–3 is classified as ultra-precision for aerospace, metrology, and optics applications.
2. Large gears need large machines. Large-diameter, large-module gears require CNC gear cutting, gear shaping, and precision gear grinding equipment with sufficient capacity. New Yinye Transmission operates a maximum gear grinding diameter of approximately 2,500 mm and a maximum module of approximately 45 mm.
3. Geometry is non-standard. Custom projects can include spur, helical, double helical, internal, ring, bevel, and planetary tooth forms, plus integral shafts, splines, and bores manufactured to customer drawings.
4. Traceability is mandatory in regulated industries. Material certificates, gear accuracy reports, hardness records, non-destructive testing documents, and final inspection reports are often contractual requirements.

The High Precision Gears Market in Context

The global gear market, including high-precision and standard variants, is estimated at USD 222.12 billion in 2025, according to Mordor Intelligence. The precision gearbox market is valued at USD 3.5 billion in 2025 with a projected CAGR of 10.7%, according to Grand View Research. Europe holds the largest revenue share of the precision gearbox market at 34.1% in 2025, and planetary gearboxes account for 65.3% of the precision gearbox segment.

End-use demand supports this growth. Asia-Pacific holds a 51% share of the wind turbine gearbox market (2024), according to Data Insights Reports, driven largely by installations in China. The global railway traction motor market was valued at USD 6.467 billion in 2024, involving high-precision traction gears, according to Market Research Future. These trends increase demand for suppliers that can manufacture large, accurate gears for wind power, railway traction, marine gearboxes, machine tools, and industrial gearboxes.

New Yinye Transmission: A Build-to-Print High Precision Gears Manufacturer

New Yinye Transmission operates an approximately 25,000 m² manufacturing facility in Wuxi, China, with approximately 125 employees and a 28-engineer R&D team. The company produces approximately 1,500 sets per year across different product categories, excluding general accessory components. Major markets include Europe, North America, Japan, Australia, and other global industrial markets, with export business accounting for 15% of total sales.

The manufacturing approach is build-to-print: production is based on customer drawings, technical specifications, and quality requirements. This makes New Yinye Transmission suitable for OEM manufacturing, long-term supply programs, contract manufacturing, capacity outsourcing, localization, and second-source projects for industrial customers with clearly defined drawings and quality requirements.

Manufacturing Capabilities

Equipment includes large CNC gear cutting, gear shaping, precision gear grinding, five-axis machining, turn-mill machining, and precision finishing. Key size and accuracy limits:

• Maximum gear grinding diameter: approximately 2,500 mm
• Maximum module: approximately 45 mm
• Typical accuracy: DIN 3962 Class 6–7 and AGMA Class 9–10
• Applicable accuracy limit: DIN 5, AGMA 12, or higher, subject to product and process review
• Bevel gear maximum machining dimension: ≤1,300 mm

Product Range

The product line covers the main gear types used in heavy-duty transmission systems:

• Cylindrical gears: spur gears, helical gears, double helical and herringbone gears
• Ring gears and internal gears, including large-diameter external and internal ring gears with customizable bolt-hole patterns
• Bevel gears: spiral bevel gears, straight bevel gears, matched bevel gear sets, bevel pinions, and bevel pinion shafts
• Planet gears for planetary gearbox systems, including large-module spur or helical planet gears
• Shafts and couplings: pinion shafts, gear shafts, spline shafts, spline couplings, and machine spindles
• Custom precision gearboxes

Materials and Heat Treatment

Materials are selected according to customer drawings and project requirements. Available options include 42CrMo, 35CrMo, 40Cr, 20MnCr5, 18CrNiMo7-6, 17CrNiMo6, 18Cr2Ni4WA, Q345D, QT400-15, alloy steel, forged steel, and other customer-specified materials.

Heat treatment options include carburizing, nitriding, induction hardening, and through hardening, subject to customer drawings and technical requirements. For planet gears manufactured from 18CrNiMo7-6 alloy steel, carburizing and quenching can provide a surface hardness of 58 HRC or higher after heat treatment, subject to the customer-specified hardness range.

Inspection and Quality Documentation

Inspection capability covers tooth profile, lead, pitch, radial runout, surface roughness, dimensional inspection, material composition, hardness, mechanical properties, ultrasonic testing, phased-array ultrasonic testing, grinding-burn inspection, micro-magnetic testing, dynamic balancing, and bevel-gear rolling contact inspection. Matched bevel gear sets can additionally be verified through rolling contact inspection and contact-pattern verification.

According to customer drawings, technical agreements, and project requirements, New Yinye Transmission can provide material certificates, dimensional inspection records, gear accuracy reports, hardness records, non-destructive testing documents, outsourced special-process records, rolling inspection records, and final inspection reports.

How to Work with a Custom High Precision Gears Manufacturer: Step by Step

The procurement workflow for custom high precision gears follows a defined sequence. New Yinye Transmission applies the same process to non-standard, medium- and small-batch, long-term supply, capacity outsourcing, and second-source projects.

1. Send drawings and technical specifications. Provide outside diameter, module or diametral pitch, tooth count, pressure angle, helix angle, face width, bore, bolt-hole pattern, material, heat treatment, accuracy grade, surface treatment, and inspection requirements.
2. Engineering and process review. The manufacturer reviews gear type, size, material, structure, and heat treatment, then confirms the achievable accuracy grade. This review determines whether DIN 5, AGMA 12, or higher applies.
3. Material selection and sourcing. Material is selected from the customer-specified grade or from standard alloy steel and forged steel options, with material documents available.
4. Heat treatment planning. Carburizing, nitriding, induction hardening, or through hardening is planned according to drawings and technical requirements.
5. Machining. Large CNC gear cutting, gear shaping, five-axis machining, and turn-mill machining produce the blank, tooth geometry, bores, shafts, and mounting features.
6. Precision grinding and finishing. Precision gear grinding and finishing achieve final accuracy, surface integrity, and dimensional tolerances, up to approximately 2,500 mm grinding diameter.
7. Inspection and testing. Gears are inspected for tooth profile, lead, pitch, radial runout, surface roughness, hardness, material composition, and, when required, non-destructive testing and dynamic balancing.
8. Documentation and delivery. Inspection records, material documents, gear accuracy reports, hardness records, non-destructive testing documents, and final inspection reports are compiled with the parts.

High Precision Gears Applications by Industry

Custom high precision gears from New Yinye Transmission are used in industrial gearboxes, wind power, mining equipment, metallurgical equipment, cement machinery, power generation equipment, machine tools, railway and locomotive equipment, engineering machinery, feed and biofuel machinery, canning machinery, and marine equipment.

• Wind power. Large-diameter ring gears, planet gears, and high-precision internal gears support wind turbine gearboxes and drivetrains. Asia-Pacific holds a 51% share of the wind turbine gearbox market (2024).
• Marine gearboxes. Gears and shafts support marine propulsion gearboxes, thrusters, deck machinery, winches, and cranes under variable loads, vibration, humidity, and salt-spray exposure, with classification-society-compliant materials and documentation where required.
• Railway traction. High precision gears are used in railway and locomotive equipment; the railway traction motor market was valued at USD 6.467 billion in 2024, involving high-precision traction gears.
• Machine tools. Spiral bevel and cylindrical gears serve five-axis machining centers, gear shaping machines, gear grinding machines, spindle units, and rotary tables, where low backlash, low vibration, and stable positioning accuracy are required.
• Industrial gearboxes and mining. Heavy-duty gears transmit torque in vibrating screen exciters, crushers, grinding mills, and hoisting equipment under impact loads and strong vibration.
• Metallurgical equipment. Gears serve blast furnace furnace-top drive systems and rolling mills under high temperatures, dust, and impact loads.
• Canning machinery. Low-backlash gears provide precise torque transmission and speed synchronization for can necking machines, trimming machines, and conveyors under high-speed, continuous-cycle operation.
• Feed and biofuel machinery. Gears in feed pellet mills and biomass pelletizers operate under heavy-duty, high-torque conditions, requiring high load capacity and wear resistance in dusty environments.

Custom High Precision Gear Types: Capability Comparison

Accuracy levels are subject to gear type, size, material, structure, heat treatment, and process review.

Frequently Asked Questions

What accuracy grades can high precision gears manufacturers achieve?

New Yinye Transmission's typical publicly listed accuracy levels include DIN 3962 Class 6–7 and AGMA Class 9–10. For applicable products, accuracy can reach DIN 5, AGMA 12, or higher, subject to gear type, size, material, structure, heat treatment, and process review. Published references place automotive transmission gears in the ISO Grade 5–7 range (equivalent to AGMA Class 11–12), while ISO Grade 1–3 is classified as ultra-precision for aerospace, metrology, and optics.

Which high precision gear types can be manufactured to customer drawings?

New Yinye Transmission manufactures spur gears, helical gears, double helical and herringbone gears, ring gears, internal gears, spiral bevel gears, straight bevel gears, planet gears, pinion shafts, gear shafts, spline shafts, spline couplings, machine spindles, and custom precision gearboxes. All are manufactured build-to-print based on customer drawings, technical specifications, and quality requirements.

What is the maximum size of custom high precision gears?

The maximum gear grinding diameter is approximately 2,500 mm and the maximum module is approximately 45 mm for applicable cylindrical and ring gear products. For bevel gears, the maximum machining dimension is ≤1,300 mm.

What materials and heat treatments are available for custom high precision gears?

Available materials include 42CrMo, 35CrMo, 40Cr, 20MnCr5, 18CrNiMo7-6, 17CrNiMo6, 18Cr2Ni4WA, Q345D, QT400-15, alloy steel, forged steel, and other customer-specified materials. Heat treatment options include carburizing, nitriding, induction hardening, and through hardening. Planet gears made of 18CrNiMo7-6 can achieve 58 HRC or higher surface hardness after carburizing and quenching.

What inspection and quality documentation does New Yinye Transmission provide?

Inspection covers tooth profile, lead, pitch, radial runout, surface roughness, dimensional inspection, material composition, hardness, mechanical properties, ultrasonic testing, phased-array ultrasonic testing, grinding-burn inspection, micro-magnetic testing, dynamic balancing, and bevel-gear rolling contact inspection. Documentation can include material certificates, dimensional inspection records, gear accuracy reports, hardness records, non-destructive testing documents, special-process records, rolling inspection records, and final inspection reports.

Can New Yinye Transmission support small batches, long-term supply, and second-source projects?

Yes. New Yinye Transmission supports non-standard, medium- and small-batch orders, long-term supply programs, contract manufacturing, capacity outsourcing, localization, and second-source projects for customers with clearly defined drawings and quality requirements. The company produces approximately 1,500 sets per year across different product categories.

How can I request a quote or sample for high precision gears?

Send drawings, technical specifications, and quality requirements to Julia at New Yinye Transmission. Email: julia@wxyinye.com. Phone: +86-510-85305960. Mobile / WeChat / WhatsApp: +86-13961777811. Address: No. 5, Hongjiang Road, Shuofang, Xinwu District, Wuxi, Jiangsu, China. The company website is https://www.wxnyy.com, and a company profile brochure is available for download below.

Conclusion

High precision gears manufacturers are evaluated on accuracy capability, equipment size limits, material and heat treatment options, inspection depth, documentation quality, and flexibility for small-batch or long-term programs. New Yinye Transmission addresses these requirements with build-to-print manufacturing in Wuxi, China: DIN 5 / AGMA 12 accuracy for applicable products, a maximum gear grinding diameter of approximately 2,500 mm, a maximum module of approximately 45 mm, and documented inspection from material composition to final gear accuracy. Send the drawings and technical specifications to julia@wxyinye.com to begin a project review.