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ISO 9001 Registered630-543-9570sales@oc-gear.com
Overton Chicago Gear
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Gearing

Precision gears for every drivetrain

Spur, helical, bevel, and worm gearing in diameters up to 160 inches — plus complete custom gearboxes and gear repair, all cut, hardened, and inspected in house.

Spur GearsUp to 160"

Spur Gears

Precision straight-tooth spur gears cut to AGMA 11 in diameters up to 160 inches — the workhorse of heavy power transmission.

Helical & Double HelicalHigh-Load

Helical & Double Helical

Single, double helical, and herringbone gears for smooth, quiet, high-load meshing in demanding drivetrains.

Bevel GearsSpiral & Straight

Bevel Gears

Spiral, straight, and skew bevel gears for reliable right-angle and intersecting-shaft power transmission.

Worm GearsHigh-Ratio

Worm Gears

Worm and worm-wheel sets for high reduction ratios, compact drives, and self-locking motion control.

Custom GearboxesEngineered

Custom Gearboxes

Complete custom gear drives — designed, built to print, and assembled with our own precision gearing.

Repair & Reverse EngineeringRestore

Repair & Reverse Engineering

Emergency gear repair, rebuilds, and reverse engineering — get critical equipment back in service fast.

No print? No problem.

Send us a worn gear or a set of requirements. We'll reverse engineer it and cut an exact replacement — geared to your specifications.

630-543-9570
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Let's build the gearing your equipment depends on.

Send us a print, a sample, or a set of requirements. Our engineers will help you spec the right gearing and get precision parts back to you fast.

Overton Chicago Gear

A full-service manufacturer of precision open gearing and custom gearboxes since 1888. A founding member of AGMA, made in Addison, Illinois.

630-543-9570sales@oc-gear.com

530 Westgate Drive, Addison, IL 60101

Gearing

  • Spur Gears
  • Helical & Double Helical
  • Bevel Gears
  • Worm Gears
  • Custom Gearboxes
  • Repair & Reverse Engineering

Company

  • About Us
  • Gearing
  • Capabilities
  • Industries
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  • Contact

Capabilities

  • 5-Axis Gear Milling
  • Carburizing & Press Quenching
  • Gear Metrology Lab
  • Contract Machining
  • Reverse Engineering

© 2026 Overton Chicago Gear. Part of the Precision Products Machining Group.

ISO 9001 RegisteredAGMA Founding Member · Est. 1888
Carved byChisel&Co.