Gear Manufacturing - We manufacture gears to your specifications

We Have Expertise in gear manufacturing including couplings, rings, shafts and assembly.

National Gear Repair can repair and remanufacture any Gear or Pinion to match OEM Specifications and Hardness on site in our Gear Manufacturing division. We can manufacture any style of gear up to 20 Feet in diameter. We manufacture Helical Gears, Double Helical Gears, Herringbone Gears, Split Hearingbone Gears, Spiral Bevel Gears, Bevel Gears, Ring Gears, Ring Gears, Worm Gears, Double Enveloping Worm Gears, Hypoid Gears, Screw Gears and More!

We have the ability to cut Gears up to 20 Feet in diameter at a considerable savings compared to OEM manufacturers pricing and we cover all of our manufactured gears with a 24 Month Warranty and the fastest turnaround time in the country. Most of our Gears are cut for our 24 Hour Emergency Gearbox Repair service which does not allow room for delays with shipping however due to the considerable savings compared to buying Gears from OEMs Brand New most of the gears and pinions utilized in our Gearbox Repair are cut in house at National Gear Repair. After each gear is cut National Gear Repair provides you with all the certifications for the heat treating and carburization of your gears.

Gearbox Manufacturers - Fast turnaround time and easy installation. 24/7, 365 live support

Our Gear Manufacturing Divisions is equipped with a Hofler Klingeinberg Rapid 8000k 8M Gear Grinder and a computerized KlingBerg system designed to check the gears on a microscopic level for quality assurance. This unit is a highly flexible direct drive 5 axis grinding system with adjustable swivel angels. Due to National Gear Repairs extensive history working directly with OEMS and with Brand Name Gearboxes we are more than comfortable manufacturing any set or gear system with the confidence to say we can match OEM Specifications regarding hardness and durability.

National Gear Repairs Technicians and Gear Engineers work hard to save you time and costs through performing modifications for your gearing allowing your Gearboxes to run better than previous and even allowing for higher output. We can reconstruct your Gearing and Manufacturer OEM quality replacements gears, Shafts, Housings and other related components. We can work directly with you to optimize the gearing and the inner workings of your gearbox to allow for even the simplest of modifications like ratio changes.

Our Machine Shop is also equipped for fine work through our machine shop division. We can perform detailed work even on large components with horizontal tuning capabilities up to 260’ in length and a 32 inch swing. For Larger volume and smaller tuning requirements we are also equipped with a Mori Seki CNC Lathe designed to handle this specific set of production needs. We have various types of engine lathes, VBMs and Super Mill HBM as well as key seaters, grinders, treadmills and horizontal broaches. We are equipped with everything needed to manufacture all the components from scratch to make a whole new gearbox.

Top Gear Box Repair Shop in USA

National Gear Repair specializes in the manufacturing of custom gears and internal components. We are committed to maintaining a high level of excellence and customer satisfaction. We strive to constantly better ourselves, our team and our equipment as complacency is the enemy of innovation and to that sentiment we are certified in accordance to ISO9001 to ensure that we are always optimizing and innovating allowing for growth to our service through more efficient processes and better customer satisfaction.

Many Gearbox Repair shops dont have the means to produce parts as Precise as National Gear Repair let alone have the equipment to check the tolerances that we can hold. We can bring the tolerance down to one tenth or .0001” accurately and correctly. National Gear Repair offers custom gears and spline products in a wide variety of materials allowing us to manufacturer products with the diversity of materials to ensure each customer can get exactly what they need. With our access to superior materials and advanced manufacturing technology as well as our teams dedication to customer satisfaction makes National Gear Repair the Nation's leading Gear Manufacturing Division. can repair and manufacture any size Gear & Pinion, including Helical, Double Helical, Herringbone, Split Herring bone, Bevel, Spiral Bevel, Spur Gears, Ring Gears, Eternal Ring Gears, Rack & Pinion, Worm Gears, Double Enveloping Worm Gears, Hypoid Gears, Screw Gears, Plus More!

We can cut Gears up to 20 feet in Diameter, at a considerable savings over OEM Manufacturer's pricing, with a 24 Month Warranty and the Quickest Turn Around Time in the Nation.

Once National Gear Repair Manufactures a Gear set for you, we will provide you with all Certifications for Heat Treating and Carburization.

Gears from 1/2 Inch to 20 Feet in Diameter

Gear Types

Key Equipment:

  • Worm and Worm Gears
  • Helical
  • Bevel
  • Spur
  • Herringbone
  • Sprocket
  • Double Helical
  • Rack
  • Internal
  • Spline
  • And many more
  • MAAG 350/500 Shaper
  • Scheiss 20’ VBM
  • Various Hobs
  • Hofler Klingelnberg Rapid 2000k
  • MAAG SH100/140 Shaper
  • MAAG SH180/300 Shaper
  • MAAG SH600/735 Shaper
  • MAAG SH450/5000 Shaper

Gear Grinding for AGMA Q12 Qualification

Our in-house gear-grinding capabilities are complemented by our Hofler Klingelnberg Rapid2000k 2M Gear Grinder and a computerized Klinglinberg gear checker for quality assurance.

Gearbox Repairs & Upgrades

From simple bearing change outs to complete rebuilds, National Gear Repair engineers and technicians are ready to assist you with a complete rebuild and repair analysis proposal prior to the rebuild. Our state-of-the-art 9,600 sq. ft. reducer repair facility meets OEM clean room requirements for both disassembly and assembly requirements. For maximum control and flexibility, we manufacture our own quality replacement gearing and components in house.

With expertise built over four decades, we’re well versed in OEM boxes including but not limited to:

  • Babcock & Wilcox
  • Boston
  • Danieli
  • Dodge
  • Ecodyne
  • Elliott
  • Falk
  • Farrel
  • Flender
  • Foote Jones
  • General Electric
  • Hansen
  • Horsburgh & Scott
  • D.O. James
  • Link Belt
  • Lufkin
  • Marley
  • Philadelphia Gear
  • Pomini
  • Santasalo
  • Terry
  • Western
  • Westinghouse
  • Winsmith
  • Custom Designs
  • And many others

Precision Gear Engineering and Design

National Gear Repair's engineers help you save time and cost through exacting modifications to your gearing and gearboxes.

Armed with portable coordinate measuring machines and hardness testers, as well as an extensive gear software library, our design staff can:​​

  • Reconstruct your gearing and manufacture OEM quality replacement gear, shafts, housings, and other related components
  • Assist you with gearbox modifications from simple ratio changes to gearbox upgrades
  • ​​
  • Reverse engineer complete gearbox applications, providing a complete drop-in replacement unit


National Gear Repair machining capabilities support large components with horizontal turning capabilities up to 260’ in length and 32" swing, and our large Scheiss VBM has the ability to turn 20’ diameter. For larger volume and smaller turning requirements, our Mori Seiki CNC lathe is able to efficiently handle these production needs.

Key Equipment:

  • Sharp CNC Lathe
  • Various Engine Lathes
  • Mori Seiki NL2400Y/1250 CNC Lathe
  • Scheiss VBMs
  • Super Mill HBM
  • Various Key Seaters, Grinders, Thread Mills, and Horizontal Broaches