High Torque Extruder Gearbox Manufacturers | Full Series Twin Screw Gear Units for Co-Rotating Extruders

If you are looking for a trusted extruder gearbox manufacturer with proven performance across industries, ZHITIAN offers a full range of high-precision gearboxes tailored for twin-screw extrusion systems.

As one of the largest twin screw gearbox manufacturers in China, ZHITIAN specializes in designing and producing extruder gearboxes from model 20 to 177, covering almost every application requirement for parallel co-rotating twin-screw extruders. Our gearboxes are widely used by complete extruder equipment manufacturers and have earned an excellent reputation for precision, reliability, and long service life.

ZHITIAN gearboxes are designed with torque grades up to 18 Nm/cm³, achieving world-class standards in performance and durability. This makes them ideal for demanding extrusion processes in plastics, chemicals, food, and new materials.

From small lab extruders to large-scale production lines, our full model range supports screw diameters from 20mm to 177mm. Custom gearbox designs for tri-screw or specialty extruders are also available.

All gearbox components are manufactured in constant-temperature, humidity-controlled workshops, ensuring consistent precision. Gears are finished with grade 6 precision in design and grade 4 after gear grinding, offering low noise, high efficiency, and long operational life.

ZHITIAN's gearbox production facility is organized into dedicated process zones for:

• Rough machining area - CNC turning and milling of housing and gear blanks.
• Heat treatment zone - Including carburizing and quenching to enhance gear durability.
• Gear grinding workshop - Achieving precision tooth profiles and ultra-smooth surfaces.
• Quality inspection center - Equipped with CMM, hardness testers, gear testers for full QC.
• Assembly and testing line - Gearboxes are 100% tested for oil leakage, noise, and performance.

ZHITIAN extruder gearboxes are widely used in:

• Plastic compounding (engineering plastics, masterbatch, biodegradable materials)
• Petrochemical pelletizing
• Powder coating and additives processing
• Food extrusion and feed production
• New energy materials (e.g., battery materials)

ZHITIAN combines European-level design quality with local manufacturing advantages, offering faster delivery and more affordable pricing without sacrificing performance.

When selecting an extruder gearbox, consider:

1. Screw Diameter & Speed
   Match the gearbox model (e.g., ZT95, ZT120) to your extruder screw size.
2. Required Torque
   Use a torque class (e.g., 12, 15, 18) that matches your material and process.
3. Mounting Type & Cooling
   ZHITIAN offers both horizontal and vertical mounting; internal or external oil circulation options are available.

ZHITIAN is more than a gearbox manufacturer -- we are a technical partner to extruder makers worldwide. With complete in-house manufacturing, advanced gear processing, and global service capability, we help customers optimize extrusion efficiency, reduce downtime, and boost ROI.