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Precision Gearboxes for Industrial Excellence

Taizhou Sihai Machinery Co., Ltd. specializes in high-performance helical gearmotors, worm gearboxes, speed variators, and custom power transmission solutions trusted globally across packaging, mixing, and environmental industries.

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About Sihai Machinery

Taizhou Sihai Machinery Co., Ltd. has been a trusted manufacturer and exporter of industrial power transmission products for over a decade. With a strong focus on quality, innovation, and customer satisfaction, we specialize in RV series worm gearboxes and a wide range of helical, hypoid, and planetary gear systems.

Our products are engineered to deliver reliable performance under demanding conditions and are widely used in packaging, environmental protection, mixing, and automation industries. We are committed to providing high-quality transmission solutions at competitive prices to clients worldwide.

  • ISO-Certified Manufacturing Standards
  • Exported to Over 50 Countries
  • Custom Design & OEM Services Available
  • Comprehensive Technical Support & Manuals
Sihai Machinery Factory

Our Product Range

Discover our comprehensive lineup of industrial gearboxes, motors, and transmission systems designed for durability, efficiency, and precision performance.

Worm Gearbox

Worm Gearbox

High-efficiency RV series worm gear reducers ideal for compact installations requiring high torque and low noise.

  • • Ratios: 5–100
  • • Power Range: 0.06–15kW
  • • Materials: Cast Iron, Aluminum Alloy
  • • Standards: CE Certified
SRC Helical Gearbox

SRC Helical Gearbox

Parallel shaft helical gear units offering high efficiency, low backlash, and long service life.

  • • Efficiency: Up to 97%
  • • Mounting: Foot or Flange
  • • Sealed for Dust & Moisture
  • • Modular Design
UDL Speed Variator

UDL Speed Variator

Stepless speed control units for precise adjustment in automation and conveyor systems.

  • • Speed Range: 1.3–18 r/min
  • • Power: 0.18–1.5kW
  • • Analog or Manual Control
  • • Compact & Lightweight
SKM Helical Hypoid Gear

SKM Helical Hypoid Gear

Right-angle hypoid gearboxes with superior load capacity and smooth operation.

  • • High Torque Density
  • • Low Noise & Vibration
  • • Input: IEC Motor Mount
  • • Lubricated for Life
PC Helical Gearbox

PC Helical Gearbox

Compact co-axial helical gear units ideal for space-constrained applications.

  • • Coaxial Output Shaft
  • • High Radial Load Capacity
  • • Optional Torque Arm
  • • CE & ISO Compliant
G3 Helical Gearmotor

G3 Helical Gearmotor

Integrated AC motor + helical gearbox for direct drive applications.

  • • Power: 0.12–7.5kW
  • • Voltage: 220–440V, 3-phase
  • • IP55 Protection
  • • IE2 Efficiency Standard

K Micro AC Helical Gear Motor

Miniature helical gearmotors for light-duty automation and precision control.

  • • Compact & Lightweight
  • • Low Noise Operation
  • • 24V/110V/220V Options
  • • Reversible Models Available

Planetary Gearbox

High-precision planetary reducers for servo and robotic applications.

  • • Backlash: <5 arcmin
  • • High Torsional Stiffness
  • • Input: Servo Motor Mount
  • • Lubricated for Life

Accessories

Torque arms, mounting flanges, output shafts, and replacement parts.

  • • OEM Replacement Parts
  • • Custom Fabrication
  • • Fast Delivery
  • • Global Shipping

Why Choose Sihai Gearboxes?

Engineered for reliability, efficiency, and long-term performance in industrial environments.

CE Certified

All products meet international safety and performance standards.

Precision Engineering

High-tolerance machining ensures smooth operation and long life.

Industrial Durability

Built to withstand dust, moisture, and continuous operation.

Custom Solutions

OEM and custom designs available to meet specific requirements.

Applications Across Industries

Sihai gearboxes are trusted in diverse industrial environments for their reliability and performance.

Environmental Protection

Used in wastewater treatment, sludge mixers, conveyor systems, and filtration equipment requiring reliable, low-maintenance operation.

Packaging Industry

Ideal for filling machines, labeling systems, capping units, and conveyor drives where precision and compact design are critical.

Mixing & Blending

Powering agitators, mixers, and reactors in chemical, food, and pharmaceutical industries with high torque and smooth operation.

15+
Years Experience
50+
Countries Served
10M+
Units Shipped
99.2%
Customer Satisfaction

Frequently Asked Questions

What is the warranty period for Sihai gearboxes?

Standard warranty is 18 months from the date of shipment. Extended warranty options are available upon request.

Can you provide custom gear ratios or mounting configurations?

Yes, we offer OEM and custom design services. Please contact our engineering team with your specifications.

Are installation manuals available?

Yes, comprehensive installation, operation, and maintenance manuals are available for all models on our website.

What certifications do your products have?

Our products are CE certified and manufactured under ISO quality management standards.

What is the typical lead time for orders?

Standard products: 15–20 days. Custom orders: 25–40 days depending on complexity.

Get in Touch

For product inquiries, technical support, or custom solutions, visit our official website to contact the Sihai team directly.

Contact Information

  • No.528, Cuihuan Road, Jiaojiang District, Taizhou, Zhejiang, China (318000)
  • +86-576-89081780, 88881278
  • +86-88887775
  • sihai@tzsihai.com

Official Website

Access product catalogs, manuals, and contact forms directly through our official domain.

Visit Official Website

For international inquiries, we respond within 24 business hours.

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