A member of the Precision Products family of companies
ISO 9001 Registered630-543-9570sales@oc-gear.com
Overton Chicago Gear
Gearing
Industries
CapabilitiesAboutContact
630-543-9570
HomeIndustriesDefense
Mission Critical

Defense

Mission-critical gearing for defense platforms, held to the tightest tolerances and full traceability.

Built for defense

Defense applications demand gearing that performs flawlessly under the most extreme conditions. We manufacture precision gears and drive components for defense platforms — from rotorcraft drivetrains to ground and naval systems — held to the tightest tolerances with complete documentation and traceability.

Challenges we solve

  • Tightest tolerances for mission-critical drivetrains
  • Full documentation and material traceability
  • Precision gearing for rotorcraft and vehicle systems
  • Reverse engineering of obsolete components

By the numbers

Tightest
Tolerances
Full
Traceability
ISO 9001
Registered QA

Recommended gearing

  • Bevel Gears
  • Helical & Double Helical
  • Repair & Reverse Engineering
Request a quote

Other industries we serve

Oil & Gas

Oil & Gas

Explore
Fracturing

Fracturing

Explore
Mining

Mining

Explore
Get started

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
  • Request a Quote
  • 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.