Spur Gears

The most common type of gears are spur gears, also known as straight-cut gears and can be found in a multitude of applications. They are specifically designed to transmit large amounts of power by placing them on parallel shafts which rotate in opposite directions.

Spur gears have a straight tooth, involute profile which project radially and are parallel to the rotation of the axis. This allows for a smoother operation between each gear and permits greater mounting distances. Spur gears can have a central hub or be hubless and are available in a variety of pitch, hub and bore diameters. The standard pressure angles in spur gears are 14.5, 20 and 25 degrees, and refer to the angle that force is transmitted between the meshing gears.

Spur gears are capable of meshing with other gears, with many gears being used to create large gear reductions. When they are meshed the gear with the most teeth is referred to as the gear, whereas the one with smaller teeth is referred to as the pinion.

What are the advantages of a spur gear?

  • High transmission efficiency
  • Compact and very easy to install
  • Constant velocity ratio
  • No slippage unlike belt drives
  • Highly reliable
  • Can transmit large amounts of power

Types of spur gears

Plastic spur gears are commonly made from acetal or nylon and have many positive characteristics including being lightweight, non-rusting and quiet. They enable low cost and large production capabilities and are also able to operate without lubrication. For hygiene reasons, plastic spur gears are an excellent choice for use in industries dealing with food production and medical equipment.

Metal spur gears have more strength, load-carrying capacity and heat resilience than their plastic counterpart. They are more dimensionally stable compared to plastic and can be made from many metals such as aluminium, brass and stainless steel.

Common applications

  • Metal cutting machines
  • Marine engines
  • Mechanical clocks and watches
  • Fuel pumps
  • Washing machines
  • Gear motors and gear pumps
  • Rack and pinion mechanisms
  • Material handling equipment
  • Automobile gear boxes
  • Steel and rolling mills

...
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Description Price Module Number of Teeth Material Bore Diameter Hub Diameter Pitch Diameter Face Width
RS Stock No. 521-6985
BrandRS PRO
TWD61.00
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0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 521-7483
BrandRS PRO
TWD143.00
Each
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1 16 POM 5mm 10mm 16mm 6mm
RS Stock No. 521-7225
BrandRS PRO
TWD192.00
Each
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0.5 80 POM 6mm 14mm 40mm 3mm
RS Stock No. 521-6339
BrandRS PRO
TWD762.00
Each
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1 40 Steel 10mm 35mm 40mm 10mm
RS Stock No. 521-7405
BrandRS PRO
TWD212.00
Each
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0.8 60 POM 6mm 14.5mm 48mm 4mm
RS Stock No. 521-7506
BrandRS PRO
TWD165.00
Each
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1 20 POM 5mm 11.7mm 20mm 6mm
RS Stock No. 182-7925
BrandRS PRO
TWD280.00
Each
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1.5 16 - 6mm 14mm 24mm 12mm
RS Stock No. 521-7512
BrandRS PRO
TWD135.00
Each
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1 24 POM 5mm 11.7mm 24mm 6mm
RS Stock No. 521-7411
BrandRS PRO
TWD225.00
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0.8 64 POM 6mm 15.5mm 51.2mm 4mm
RS Stock No. 182-7894
BrandRS PRO
TWD795.00
Each
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0.5 48 Steel 5mm 15mm 24mm 4mm
RS Stock No. 878-7819
BrandRS PRO
TWD682.00
Each
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0.5 12 Steel 3mm 8mm 6mm 5mm
RS Stock No. 521-6525
BrandRS PRO
TWD2,016.00
Each
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1.5 60 Steel 15mm 50mm 90mm 15mm
RS Stock No. 521-6238
BrandRS PRO
TWD339.00
Each
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1 18 Steel 8mm 20mm 18mm 10mm
RS Stock No. 182-7832
BrandRS PRO
TWD260.00
Each
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1.5 16 Steel 8mm 20mm 24mm 17mm
RS Stock No. 521-6676
BrandRS PRO
TWD1,942.00
Each
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2 50 Steel 15mm 55mm 100mm 20mm
RS Stock No. 521-7427
BrandRS PRO
TWD239.00
Each
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0.8 70 POM 6mm 15.5mm 56mm 4mm
RS Stock No. 182-7943
BrandRS PRO
TWD280.00
Each
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2 12 - 8mm 18.5mm 24mm 15mm
RS Stock No. 521-7247
BrandRS PRO
TWD60.00
Each
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0.8 15 POM 3mm 6mm 12mm 4mm
RS Stock No. 182-7959
BrandRS PRO
TWD992.00
Each
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2 60 - 14mm 30mm 120mm 15mm
RS Stock No. 521-6294
BrandRS PRO
TWD569.00
Each
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1 28 Steel 8mm 22mm 28mm 10mm