Plastic spur gear

Plastic spur gears have a long history in autos, appliances, office equipment, tools, and elsewhere. Designers continue to extend their use in transferring torque and motion as polymers improve and processing gains in sophistication. They often choose plastic for gears over metal because of the many benefits plastic offers.

What Is a Spur Gear?

Spur gears are one of the most popular types of precision cylindrical gears. These gears feature a simple design of straight, parallel teeth positioned around the circumference of a cylinder body with a central bore that fits over a shaft. 

Plastic Spur Gear Applications

  • Transmissions
  • Conveyor systems
  • Speed reducers
  • Engines and mechanical transportation systems
  • Gear pumps and motors
  • Machining tools


Large Plastic Spur Gears

Large plastic spur gears have a wide range of applications in aerospace, Marine, mining, automation and defense industries. Custom manufactured metric and Imperial straight teeth, helices, worm gears, herringbone, rack, crown, planet, bevel, hypoid and other gear types are available. Materials include brass, bronze, aluminum, nylon and plastic.

Small Plastic Spur Gears

There are many plastic gears available for applications that require power transmission and movement between two parallel shafts. The most common type of gear is spur gear. This gear is easy to manufacture and can be manufactured to close tolerances. They are also cheap to produce and can be produced quickly to meet demand.

Standard/Stock Plastic Spur Gears

  • Cold rolled aluminum or carbon steel construction materials with high-quality surface finishes
  • AGMA 6-8 quality
  • 5° or 20° pressure angles
  • Diametral pitches of 6–48 teeth per inch
  • Modules of 0.6–4 millimeter per teeth
  • Outside diameters of up to 6 inches


What lubricant (if any) should I use on plastic bearings and gears?

To optimize lubrication of plastic components, you should abide by one basic guideline: choose a lubricant that is compatible with the plastic material. Compatibility must be verified under all anticipated adverse conditions of load, speed, and environment. Incompatible plastic-lubricant combinations often cause operating problems such as stress cracking or failure of the plastic component.

What affects the compatibility between lubricants and plastics?

Compatibility factors include the lubricant’s chemistry (base oil, thickeners, and additives), viscosity, and aging resistance.

Custom Plastic Spur Gears

  • Major diameter, or outside diameter
  • Minor diameter, or inside diameter
  • Backlash, which allows for lubrication and thermal expansion without significantly altering the functionality of the machinery
  • Involute tooth profile


Plastic Spur Gear Catalog

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How Does Plastic Spur Gear Work?

The most commonly used type of gears is spur gears. Also called straight-cut gears, they have straight teeth that are cut or inserted parallel to the gear’s shaft on a circular gear body. In mated pairs, these gears employ the parallel axes configuration to transmit motion and power. Depending on the application, they can be mated with another spur gear, an internal gear (such as in a planetary gear system), or a gear rack (such as in a rack and pinion gear pair). Their shafts are parallel and coplanar.

There are two types of spur gears: external and internal. The teeth on external gears are cut on the outside surface of the cylinder that makes up the gear. Two external gears mesh together and rotate in opposite directions. An internal gear’s teeth are cut on the inside surface of their circular form. A smaller external gear sits inside an internal spur gear, and the two or more gears rotate in the same direction. Internal gear assemblies take up less space than external gear assemblies because the shafts can be positioned closer together.

Plastic Spur Gear Material

Spur gears can be made from a variety of metals, or plastics such as nylon or polycarbonate. Plastic spur gears create less noise but are not as strong and have less loading capability. Unlike other gear types, spur gears don’t experience high losses due to slippage, so they generally have high transmission efficiency.

What Are Spur Gears Use?

Plastic Spur Gear

Spur gears are a type of cylindrical gear, with shafts that are parallel and coplanar, and teeth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – easy to manufacture and suitable for a wide range of applications.

The teeth of a spur gear have an involute profile and mesh one tooth at a time. The involute form means that spur gears only produce radial forces (no axial forces), but the method of tooth meshing causes high stress on the gear teeth and high noise production. Because of this, spur gears are typically used for lower speed applications, although they can be used at almost any speed.

High Quality Plastic Spur Gear for Sale

Gears made of plastic produce less noise, but at the expense of strength and loading capability. Unlike other gear types, spur gears don’t experience high losses due to slippage, so they generally have high transmission efficiency. 

Steel Spur Gear Vs Plastic

In the battle between steel spur gears and plastic spur gears, it all comes down to specific use cases. Plastic spur gears, for example, are strong, durable, reliable, and reasonably priced, but they are definitely limited to small appliances, electronics, and toys.

This is entirely due to the fact that plastic spur gears can be easily interchangeable, they can be manufactured easily, and they can be fully customized to match the unique specifications required for a particular product.

Steel spur gears offer a number of potential benefits for these large industrial applications, ranging from optimum durability to reliability, strength and torque to service life and flexibility. Steel spur gears are particularly common components that offer many different potential applications.

Metal Spur Gear Vs Plastic

Typically plastic is fine for the spur gear, as long as gear mesh is set reasonably well they should last for a long time.

Typically plastic is fine for the spur gear, as long as gear mesh is set reasonably well they should last for a long time. A correctly set slipper will protect it from most mayhem. Little need for the extra rotating mass and inertia of metal. There are no issue running plastic spur gears with brushless motors.Having a metal spur gear makes the pinion a target for weakness and wear over time.

Plastic spur gear-5

Plastic Spur Gear Advantages

Spur gears provide several benefits to industrial applications and processes,including: 


  • Simplicity. Spur gears feature a simple, compact design that makes them easy to design and install, even in limited or restricted spaces.
  • Constant Speed Drive. These gears increase or decrease shaft speed with a high degree of precision at a constant velocity.
  • Reliability. Unlike other power and motion transmission components, spur gears are unlikely to slip during operation. Additionally, their durability decreases their risk of premature failure.
  • Cost-Effectiveness. The simplicity of their design also allows for greater manufacturability, making them less expensive to fabricate and purchase even with highly specific or customized dimensions.
  • Efficiency. Spur gear systems have power transmission efficiencies between 95% and 99% and can transfer large amounts of power across multiple gears with minimal power loss.

Why Choose Us?

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