Custom Industrial Gear Manufacturing
OEM Replacement & Custom-Engineered Gears Built to Exact Specifications
National Gear Repair provides custom gear manufacturing for large industrial gears, pinions, shafts, ring gears, helical gears, herringbone gears, bevel gears, worm gears, and replacement gear components. Our team manufactures OEM-spec and reverse-engineered gears for heavy-duty industries nationwide, with large gear cutting capabilities up to 20 feet in diameter, precision tolerances, emergency support, and a 24-month warranty. couplings, rings, shafts, and assemblies, our team of certified technicians and engineers delivers precision-crafted gears that meet or exceed OEM specifications.
Inside Industrial Gear Manufacturing: Precision, Power & Innovation
Industrial gear manufacturing isn’t just machining—it’s engineering precision built to survive extreme torque, heat, shock loads, and continuous duty. At National Gear Repair, we manufacture heavy-duty gears to match OEM specifications or improve on them when the application demands more strength, longer life, or better performance. Whether you need a replacement gear, a complete set, or a custom solution, our process is designed to deliver accuracy, consistency, and reliability from start to finish.
Every project starts with your application: load, speed, duty cycle, lubrication, and the failure history (if you’re replacing a damaged gear). From there, we confirm gear geometry using prints, samples, or reverse engineering—then select the right material and heat treatment for the job. Our manufacturing team produces gears with tight tolerances, controlling critical features like tooth profile, pitch, lead, runout, and surface finish. When required, we finish gears through precision grinding to improve mesh accuracy, reduce noise and vibration, and extend service life.
Why Choose National Gear Repair for Gear Manufacturing?
Manufacture & Repair of Any Gear or Pinion
Manufacture & Repair Any Gear or Pinion to match OEM hardness and specifications
Large Gear Cutting Capability
Cut gears up to 20 feet in diameter with unmatched precision
Emergency Gear Repair Service
Emergency 24-hour gear repair service with fast in-house manufactured gears
Manufacture & Repair
24-Month Warranty on all gears manufactured
Cost-Effective Solutions
Significant cost savings compared to OEM manufacturers
Types of Gears We Manufacture
Our Gear Manufacturing Division produces a full range of industrial gears, including:
- Helical Gears & Double Helical Gears
- Herringbone Gears & Split Herringbone Gears
- Spiral Bevel Gears & Bevel Gears
- Ring Gears (large diameter & precision-cut)
- Worm Gears & Double Enveloping Worm Gears
- Hypoid Gears & Screw Gears
- And many more custom applications
Advanced Gear Manufacturing Technology
Our facilities are equipped with advanced machinery and state-of-the-art systems to deliver unmatched precision in manufacturing. We utilize Hofler Klingelnberg Rapid 8000k 8M Gear Grinders and Computerized Klingelnberg Inspection Systems for microscopic-level quality control. With direct-drive 5-axis grinding systems featuring adjustable swivel angles, we ensure accuracy in every detail. Our capabilities also include horizontal turning up to 260 feet in length with a 32-inch swing capacity, supported by Mori Seki CNC Lathes, VBMs, HBM Super Mills, key seaters, grinders, and more. These resources allow us to maintain tight tolerances up to .0001”, guaranteeing that your gears, shafts, and housings are manufactured with absolute precision.
Industries We Serve
We manufacture gears for:
Steel & Rolling Mills
Power Generation
Mining & Cement
Oil & Gas
Pulp & Paper
Marine & Aerospace
And many more
specialized sectors
Why We’re America’s Trusted Gear Manufacturing Partner
Unlike many other repair shops, we have the equipment and expertise to hold the tightest tolerances and deliver precision custom gears faster, with guaranteed quality.
Decades of experience
in industrial gear repair & manufacturing
Nation’s top gear repair shop
with in-house production capabilities
Customer-first approach
with 24/7/365 support
Commitment to innovation & efficiency
in every process
Top Large Gear Manufacturing Company - USA
Our gear engineers go beyond manufacturing replacement gears by providing advanced solutions tailored to your needs. They optimize gearboxes for higher output, modify gear ratios to enhance performance, and reconstruct or redesign OEM-quality replacements with precision. In addition, we deliver custom spline products in a wide range of materials, ensuring durability, efficiency, and reliability for every application.
Heavy-Duty Large Gears, Built Right!
When downtime is not an option, trust National Gear Repair for fast, certified, and cost-effective gear manufacturing solutions.
National Gear Repair – Precision. Reliability. Performance.
Call Us
(909) 931-0300
Email Us
Tony@NationalGearRepair.com
Get Your Gear Quote Today!
Frequently Asked Questions About Gear Manufacturing
What sizes of gears can you manufacture?
We manufacture and cut gears up to 20 feet in diameter, holding precision tolerances down to 0.0001 inches depending on the application requirements.
Do your gears meet OEM specifications?
Yes. Every gear we produce is engineered to match OEM hardness and durability standards. We also provide certifications for heat treating and carburization with every manufactured gear.
What is your turnaround time?
We specialize in rapid turnaround and offer 24/7/365 support. Many gears are manufactured in-house to support our emergency gearbox repair services, which helps minimize downtime for your operation.
What types of custom gears do you manufacture?
We manufacture helical gears, double helical gears, herringbone gears, bevel gears, spiral bevel gears, worm gears, ring gears, pinions, shafts, splines, and other industrial gear components.
Are there companies that specialize in emergency gear repair services?
Yes. We specialize in emergency gear repair services for industrial operations that cannot afford extended downtime.
National Gear Repair provides emergency gear repair services for facilities across the United States, including 24/7 support and 24- to 48-hour rush repair options when available.
Do you offer a warranty?
Yes. All gears we manufacture are covered by a 24-month warranty that guarantees workmanship and materials under normal operating conditions.
Which industries do you serve?
We provide gear manufacturing solutions for a wide range of industries, including steel and rolling mills, power generation, mining, cement, oil and gas, pulp and paper, marine, and aerospace.
Can you modify gear ratios or optimize gearbox performance?
Yes. Our experienced engineering team performs ratio changes, performance optimizations, and complete component reconstructions to help improve output, efficiency, and reliability.
Can you manufacture gears without OEM drawings?
Yes. National Gear Repair can reverse engineer worn, damaged, or obsolete gears using an existing sample, measurements, application requirements, and inspection data.
Can you manufacture gears from customer-provided blueprints?
Yes. National Gear Repair can manufacture gears from customer provided blueprints, drawings, samples, or worn/damaged parts.
If you already have a blueprint, our team can use it to help manufacture replacement gears to the required specifications.