At our foundry and machining facility, we specialize in the production of custom-cast girth gears and pinions, essential components for rotary kilns, ball mills, and rotary dryers. With years of industry experience, we serve global clients in the cement, mining, metallurgy, and chemical sectors, providing reliable and precisely machined gear systems tailored to their equipment.
Unlike smaller or more intricate castings—such as custom roll skins for double roll crushers, which often require foam modeling—the production of girth gears follows a robust and standardized sand casting process, ensuring dimensional stability and metallurgical quality for large, high-load gears.
Girth Gears for Rotary Kilns
Rotary kilns operate under high thermal stress and continuous rotation, requiring large-diameter girth gears with excellent wear resistance and structural strength. We manufacture kiln girth gears with:
- Outer diameter: 1,500 mm to 8,000 mm
- Module range: 8 to 40
- Material: Cast steel ZG45 / ZG42CrMo / GS-34CrNiMo6
- Tooth profile: Helical or straight teeth, depending on transmission requirement
- Heat treatment: Normalizing or quenching & tempering
Our kiln girth gears are widely used in cement plants, lime kilns, and metallurgical kilns, ensuring stable torque transmission under extreme operating conditions.
Girth Gears for Ball Mills
Ball mill girth gears typically face heavy loads and start-stop cycles. Precision and balance are critical to ensure smooth operation and prevent vibration or tooth damage. For ball mills, we supply:
- Diameter: 1,200 mm to 6,500 mm
- Face width: Up to 600 mm
- Gear ratio: As per design
- Custom machining: CNC gear hobbing, drilling, and gear flank inspection
Our ball mill girth gears are in service in gold mines, cement grinding stations, and mineral processing plants, meeting OEM standards or customized requirements based on supplied drawings.
Girth Gears for Rotary Dryers
Rotary dryers often require mid-sized girth gears with moderate torque transmission. While the mechanical load is not as extreme as that of kilns or mills, precision alignment and surface hardness remain critical. We manufacture dryer girth gears with:
- Diameter: 1,000 mm to 4,000 mm
- Tooth type: Straight-cut for ease of alignment
- Surface treatment: Shot blasting, anti-rust coating, or gear grinding
- Material options: Cast steel or ductile iron depending on load
These gears are used in fertilizer drying lines, chemical processing units, and biomass dryers across Asia, Europe, and Latin America.
Pinions – Matched for Durability and Efficiency
Every girth gear system is incomplete without a properly matched pinion gear. We provide pinions machined to strict tolerance, with hardened tooth surfaces and accurate bore alignment. Typical specifications include:
- Pinion shaft diameter: 100 mm to 500 mm
- Face width: 200 mm to 500 mm
- Tooth hardness: HB 260–300 or customized
- Mounting type: Flanged or shaft-mounted with keyways
Our pinions undergo 100% inspection and can be shipped as part of a full gear set to ensure perfect engagement.
Manufacturing Excellence – From Drawing to Delivery
All gears are manufactured based on customer drawings, 3D models, or detailed specifications. We offer complete services from pattern making and sand casting to rough and finish machining, ensuring:
- Accurate tooth geometry and pitch
- Balanced rotation and tight runout control
- Gear meshing test (if required) before delivery
- Wooden box or steel-frame packaging for international shipment
Whether you are replacing a worn-out gear or sourcing for a new equipment line, we can deliver customized girth gears and pinions with short lead times and full technical support.
Serving Global Industrial Needs
We have supplied girth gears and pinions to projects in:
- Vietnam – rotary kiln lines in cement plants
- Peru – copper concentrator ball mills
- Russia – drying systems for potash production
- Saudi Arabia – rotary kilns for lime and metallurgy
Each gear is proof of our ability to adapt to regional standards, harsh environments, and specific mechanical requirements.
Request a Quote or Send Us Your Drawings
If you’re looking for a reliable manufacturer of girth gears and pinions, we’re here to help. Our engineers can analyze your drawings and provide design optimization suggestions if needed. Interested in more details about our equipment? Learn more about our Ball Mill Solutions, Rotary Kiln Gear Systems, and Dryer Gear Components.
📩 Contact us today to get a detailed quotation, lead time estimate, and production recommendation tailored to your machinery.