Kerfgrid
Machine shop Checked Oct 8, 2026

Overton Chicago Gear

Lombard, IL · low volume to production

Certifications · select one to see where it is stated
About

Overton Chicago Gear makes custom gears and gearboxes, and rebuilds gearboxes from any manufacturer, for industries such as oil and gas, mining, marine, energy and defense. It also sells contract machining and heat treatment for non-gearing parts, including large shafts and rings.

Summary written by Kerfgrid from oc-gear.com.

Processes

Select a process to see the sentence it comes from.

Industries
Oil and gas, mining, marine, energy, defense, medical, rail, general industrial
Volumes
Low volume to production
On the shop floor
3 machines listed on oc-gear.com
  • Hofler 2400
  • Klingelnberg hard cut spiral bevel machines
  • Gleason bevel cutters
Where each detail comes from
  • Processes · Gear cutting
    “Our Klingelnberg hard cut spiral bevel machines typically produce AGMA Q11 sets to 85-inch diameter.”
    oc-gear.com/open-gearing-capabilities/
  • Processes · Grinding
    “OCG uses a combination of profile and threaded wheel grinders”
    oc-gear.com/open-gearing-capabilities/
  • Processes · 5-axis machining
    “OCG has more 5-axis milling machines than any other gear manufacturer in North America.”
    oc-gear.com
  • Processes · CNC milling
    “We provide horizontal and vertical gantry milling for any parts that we turn.”
    oc-gear.com/contract-machining/
  • Processes · CNC turning
    “Our manufacturing floor is especially well suited to turn and mill large shafts.”
    oc-gear.com/contract-machining/
  • Processes · Drilling and tapping
    “turning, milling, drilling, 5-axis machining, wire EDM work”
    oc-gear.com/contract-machining/
  • Processes · EDM
    “We offer wire EDM shapes into parts 40-inch square by 24-inch high.”
    oc-gear.com/contract-machining/
  • Processes · Heat treating
    “Precision machining and heat treatment services for non-gearing applications.”
    oc-gear.com
  • Processes · Repair and rebuild
    “We rebuild and upgrade gearboxes from any manufacturer.”
    oc-gear.com
  • Processes · Engineering and design
    “Engineering expertise to improve or develop more complex gearing.”
    oc-gear.com
  • Certifications · ISO 9001
    “Overton Chicago Gear is ISO9001 Registered.”
    oc-gear.com
  • Industries · Oil and gas
    “Oil & Gas Fracturing”
    oc-gear.com
  • Industries · Mining
    “Mining”
    oc-gear.com
  • Industries · Marine
    “Marine”
    oc-gear.com
  • Industries · Energy
    “Wind Energy”
    oc-gear.com
  • Industries · Defense
    “Defense”
    oc-gear.com
  • Industries · Medical
    “Medical”
    oc-gear.com
  • Industries · Rail
    “Locomotion”
    oc-gear.com
  • Industries · General industrial
    “Metal Processing”
    oc-gear.com