Girth Gears

Our girth gears (also known as gear rings or bull gears) are the primary drive components for rotary kilns, ball mills, and industrial dryers. Manufactured from high-quality cast steel such as ZG45 and ZG42CrMo, our girth gears feature precise tooth profiles machined on large-capacity gear hobbing machines to ensure smooth, reliable power transmission under continuous heavy loads.

Key Specifications:

Outer diameter: up to 12 meters
Module range: M8 – M55
Weight: 1 – 15 tons per piece
Split design: two-half or multi-segment available
Standards: DIN, AGMA, JIS, or per customer drawing

Every girth gear is stress-relieved, ultrasonically tested, and dimensionally verified before shipment. We also supply matching pinion shafts for complete drive system solutions.

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Specialist in manufacturing large forged and cast herringbone girth gears for ball mills, SAG mills, and rotary kilns. Custom heat treatment and precision gear cutting.

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Heavy-Duty Girth Gears (Ring Gears) for Mills and Kilns

Specialist in manufacturing large, segmented girth gears from high-strength cast and forged alloy steels. Precision-machined for mining mills, cement kilns, and dryers.

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Custom Cast Iron Girth Gears for Kilns, Dryers, and Industrial Mixers

We manufacture custom cast iron and ductile iron girth gears for rotary kilns, dryers, and mixers. A cost-effective solution for low-speed industrial machinery.

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Heavy-Duty Segmented (Split) Girth Gears

Specialist in manufacturing large, multi-segment (split) girth gears from high-strength cast steel (ZG42CrMo). Precision machined for ball mills, SAG mills, and rotary kilns.

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Girth Gears

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