Best Mechanical Internal Gears of 2026

Brian Howie Avatar
Brian Howie
Last Updated: Jan 8, 2026

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Mechanical internal gears are a versatile and efficient solution for transmitting power between two intersecting shafts. These gears feature teeth on the inner surface, allowing them to mesh with external gears and provide a smooth and reliable transfer of torque. With their compact design and ability to handle high loads, mechanical internal gears are commonly used in various industries, including automotive, aerospace, and machinery. Whether it's for power transmission or speed reduction, these gears offer exceptional performance and durability, making them an essential component in many mechanical systems.

At a Glance: Our Top Picks

XCNC Internal Gear Ring 83T Cover #TOP 1
XCNC Internal Gear Ring 83T
ftb score rating icon 9.9
KUAOXK 120T Spur Gear Pinion 8mm Cover #TOP 2
KUAOXK 120T Spur Gear Pinion 8mm
ftb score rating icon 9.8
KUAOXK Nylon Plastic Bevel Gear 24mm Keyway 8mm Cover #TOP 3
KUAOXK Nylon Plastic Bevel Gear 24mm Keyway 8mm
ftb score rating icon 9.6

Top 10 Mechanical Internal Gears

#TOP 1

XCNC Internal Gear Ring 83T

L179-12-1
XCNC Internal Gear Ring 83T Cover
Internal Gear Ring, Gear Planetary Teeth (Outer Diameter: 179mm, Thickness: 12mm, Number of Teeth: 83 Teeth)

The XCNC Internal Gear Ring is designed for mechanical applications. With a large outer diameter of 179mm and a thickness of 12mm, it provides a robust structure for various gear systems. Featuring 83 teeth, this gear ring enhances the efficiency of power transmission, ensuring smooth operation in machinery. Its internal gear teeth design allows for precise alignment and better torque distribution, which can significantly improve the performance of your mechanical setup. By choosing this gear ring, you can expect durability and reliability in your engineering projects.

What We Like
Durable construction
Efficient power transmission
Precise alignment
Improves machinery performance
#TOP 2

KUAOXK 120T Spur Gear Pinion 8mm

KUAOXK
One Color
KUAOXK 120T Spur Gear Pinion 8mm Cover
KUAOXK-Bevel Gear Pinion Hardware Mechanical 1pc Spur Gear Pinion 120T 1 Mod Gear Rack 120 Teeth Bore 8mm 10mm 12mm Spur Gear Precision 45 Steel CNC and Pinion(8mm)

The KUAOXK Spur Gear offers high durability and strength, giving you reliable performance even under heavy torque. Its design minimizes vibration and noise, which means your machinery will run more quietly and smoothly, improving your working environment. The gear is also easy to clean and maintain, saving you time and effort when it comes to upkeep. Additionally, the smooth and hardened surface ensures the gear resists wear, helping it last longer and work efficiently in your mechanical projects.

What We Like
High durability
Low vibration
Quiet operation
Easy maintenance
Wear resistance
#TOP 3

KUAOXK Nylon Plastic Bevel Gear 24mm Keyway 8mm

KUAOXK
One Color
24mm (keyway 8mm)
KUAOXK Nylon Plastic Bevel Gear 24mm Keyway 8mm Cover
Bevel Gear Pinion Hardware Mechanical 1pcs 1:1 Nylon Plastic Bevel Gear 2M 25 Teeth Inner Hole 10/12/14/15/16-25mm 2 Modulus Gear 90 Degrees Meshing Angle(24mm (Keyway 8mm))

The KUAOXK Nylon Bevel Gear offers strong durability and excellent torque, which means you can rely on it for tough mechanical tasks. Its design helps reduce vibrations and noise, making your projects quieter and more comfortable to work on. The gear is also easy to clean and maintain, saving you time and effort in upkeep. Plus, its smooth, hardened surface resists wear, helping the gear perform efficiently over time. Whether you're repairing or building machinery, this gear provides practical benefits that make your work smoother and more reliable.

What We Like
High durability and torque
Low vibration and noise
Easy cleaning and maintenance
Wear-resistant smooth surface
#TOP 4

XCNC Internal Gear Ring

L180-20-1
XCNC Internal Gear Ring Cover
Internal Gear Ring, Gear Planetary Teeth (Outer Diameter: 180mm, Thickness: 20mm, Number of Teeth: 73 Teeth)

The XCNC Gear Ring features a robust internal gear design, perfect for various mechanical applications. With an outer diameter of 180mm, it provides ample surface area for effective power transmission. The thickness of 20mm ensures durability, making it suitable for demanding environments. Boasting 73 teeth, this gear ring enhances precision and efficiency, allowing you to achieve smoother operation in your machinery. These attributes make it an excellent choice for anyone looking to improve their mechanical systems.

What We Like
Durable construction
High precision operation
Efficient power transmission
Versatile applications
#TOP 5

KUAOXK Bevel Gear Pinion 1M 11T

KUAOXK
One Color
11 - 57 Teeth
KUAOXK Bevel Gear Pinion 1M 11T Cover
Bevel Gear Pinion Hardware Mechanical 1M 11T 0.8M 57T Dual Reduction Gear 5MM Hole Parts

The KUAOXK Bevel Gear is designed to deliver strong performance with its high strength and torque, making it a reliable choice for your mechanical projects. Its design reduces vibrations and noise, so you can enjoy smoother and quieter operation. The gear is also easy to clean and maintain, saving you time and effort in upkeep. Additionally, its smooth, hardened surface resists wear, helping the gear last longer and work more efficiently. Overall, the KUAOXK Bevel Gear offers durability and ease of use that can improve your mechanical tasks.

What We Like
High strength and torque
Low vibration and noise
Easy maintenance
Durable, wear-resistant surface
#TOP 6

XCNC Internal Gear Ring 70T

L175-22-1
XCNC Internal Gear Ring 70T Cover
Internal Gear Ring, Gear Planetary Teeth (Outer Diameter: 175mm, Thickness: 22mm, Number of Teeth: 70 Teeth)

The XCNC Gear Ring features an internal design with planetary teeth, making it an essential component for various mechanical applications. With an outer diameter of 175mm and a thickness of 22mm, this gear ring is robust and durable. The 70 teeth design ensures smooth operation and efficiency in gear systems, providing you with reliable performance. Whether you're working on machinery or automotive projects, this gear ring can enhance your setup, allowing for better torque transfer and improved functionality.

What We Like
Durable construction
Smooth operation
Efficient performance
Versatile applications
#TOP 7

KUAOXK Bevel Gear Pinion 100 Teeth Steel

KUAOXK
One Color
100 Teeth
KUAOXK Bevel Gear Pinion 100 Teeth Steel Cover
Bevel Gear Pinion Hardware Mechanical 0.5M 20/38/55/70/80/100/120 Teeth 5mm Metal Steel Spur Gear DIY Motor Driving Gear(100 Teeth)

The KUAOXK Steel Bevel Gear is designed to deliver strong performance with its high strength and torque, making it ideal for demanding mechanical tasks. You’ll appreciate its low vibration and noise, which help create a quieter and smoother working environment. This gear is also easy to clean and maintain, giving you hassle-free upkeep and ensuring it stays in good condition longer. Additionally, its smooth surface and hardened finish help resist wear and tear, so you can rely on it for efficient and consistent operation in your DIY motor projects.

What We Like
High strength and torque
Low vibration and noise
Easy maintenance
Durable smooth surface
#TOP 8

KUAOXK 17T 2M Bevel Gear Pinion

KUAOXK
One Color
17mm-keyway 5x2.3mm
KUAOXK 17T 2M Bevel Gear Pinion Cover
Bevel Gear Pinion Hardware Mechanical 17T 2M Spur Gear 45# Steel 17 Teeth(OD 38mm) Drive Flat Gear Keyway Bore 12/14/15/16/17/18/19/20mm(17mm-Keyway 5x2.3mm)

The KUAOXK Bevel Gear is designed with high strength and torque, making it reliable for demanding mechanical tasks. You’ll appreciate its smooth operation with minimal vibration, which reduces noise and helps maintain a peaceful environment. This gear is also easy to clean and maintain, so you can keep it running smoothly without hassle. Plus, the hardened surface resists wear and tear, ensuring better efficiency and longer service life. Overall, this gear is a practical choice for those who want durability and ease of use in their mechanical parts.

What We Like
High strength and torque
Low vibration and noise
Easy cleaning and maintenance
Durable hardened surface
#TOP 9

KUAOXK Bevel Gear Pinion Mod 2 M=2 12T-15T Steel

KUAOXK
One Color
8mm-12 Teeth
KUAOXK Bevel Gear Pinion Mod 2 M=2 12T-15T Steel Cover
Bevel Gear Pinion Hardware Mechanical Spur Gear Pinion Mod 2 M=2 12T 13T 15T Teeth 45# Steel Positive Gear CNC Gear Rack Transmission Motor Gears 12teeth(8mm-12 Teeth)

The KUAOXK Bevel Gear Pinion offers strong and durable performance, making it ideal when you need reliable power transmission. Its high strength and torque mean it can handle demanding tasks without breaking down. You will appreciate the quiet operation and minimal vibrations, which create a smoother and more comfortable experience while using your machinery. This gear is also designed for easy cleaning and maintenance, so you can keep it running efficiently without hassle. Plus, the smooth and hardened surface helps it resist wear, ensuring longer life and better work efficiency for your projects.

What We Like
High strength and torque
Low vibration and noise
Easy maintenance
Durable hardened surface
#TOP 10

KUAOXK Bevel Gear Pinion Mod 2 12T Steel

KUAOXK
One Color
KUAOXK Bevel Gear Pinion Mod 2 12T Steel Cover
Bevel Gear Pinion Hardware Mechanical 1pcs Spur Gear Pinion Mod 2 12T Teeth Steel Positive Gear CNC Gear Rack Transmission Motor Gears(8mm)

The KUAOXK Bevel Gear Pinion offers a strong and durable design, providing you with excellent torque and reliable mechanical performance. Its smooth operation helps reduce vibrations and noise, making it ideal for quieter environments and more precise tasks. You’ll appreciate how easy it is to clean and maintain, saving you time and effort in upkeep. Additionally, the gear’s hardened surface resists minor wear and tear, ensuring it lasts longer and keeps your machinery running efficiently. This gear is a great choice if you want dependable performance with minimal hassle.

What We Like
High strength and torque
Low vibration and noise
Easy cleaning and maintenance
Durable hardened surface
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What are the different types of internal gears?

Internal gears come in two types: those with teeth parallel to the axis and those with teeth formed in a helix shape. However, gears with teeth parallel to the axis are more commonly used.

2. What machines use internal gears?

Internal gears are commonly used in planetary gear box applications due to their advantages such as low vibration, high speed reduction ratio, and cost-effectiveness. They can also be applied in other situations where their unique characteristics are beneficial.

3. What are the advantages of internal gears?

Internal gears offer the advantage of reliability as all the moving parts responsible for shifting are contained within a sealed unit, such as a hub. This protects them from water, dirt, road salt, and grime, ensuring their longevity and performance.

4. How are internal gears cut?

Internal gears are typically manufactured using the shaping process with a pinion cutter. Other methods such as hobbing, milling, and shaping with a rack cutter are primarily used for external gears.

Editor's Notes

During our mechanical internal gear research, we found 24 mechanical internal gear products and shortlisted 10 quality products. We collected and analyzed 3,019 customer reviews through our big data system to write the mechanical internal gears list. We found that most customers choose mechanical internal gears with an average price of $103.20.

The mechanical internal gears are available for purchase. We have researched hundreds of brands and picked the top brands of mechanical internal gears, including XCNC, KUAOXK. The seller of top 1 product has received honest feedback from 6 consumers with an average rating of 2.7.

Written by
Brian Howie Avatar

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.