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. 521-7001
BrandRS PRO
SGD2.85
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0.5 16 POM 3mm 6mm 8mm 3mm
RS Stock No. 521-7354
BrandRS PRO
SGD6.16
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0.8 40 POM 6mm 12mm 32mm 4mm
RS Stock No. 878-7862
BrandRS PRO
SGD18.31
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0.8 18 Steel 5mm 12mm 14.4mm 6mm
RS Stock No. 521-6452
BrandRS PRO
SGD27.30
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1.5 24 Steel 8mm 28mm 36mm 15mm
RS Stock No. 521-7477
BrandRS PRO
SGD6.35
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1 15 POM 4mm 8mm 15mm 6mm
RS Stock No. 878-7881
BrandRS PRO
SGD41.55
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0.8 50 Steel 8mm 19mm 40mm 6mm
RS Stock No. 521-6503
BrandRS PRO
SGD55.78
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1.5 44 Steel 12mm 45mm 66mm 15mm
RS Stock No. 521-6288
BrandRS PRO
SGD18.31
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1 26 Steel 8mm 22mm 26mm 10mm
RS Stock No. 521-6676
BrandRS PRO
SGD90.34
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2 50 Steel 15mm 55mm 100mm 20mm
RS Stock No. 521-6323
BrandRS PRO
SGD33.99
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1 36 Steel 10mm 28mm 36mm 10mm
RS Stock No. 878-7853
BrandRS PRO
SGD18.02
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0.8 16 Steel 4mm 10mm 12.8mm 6mm
RS Stock No. 878-7897
BrandRS PRO
SGD13.08
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1 10 Steel 6mm 12.5mm 10mm 5mm
RS Stock No. 521-6991
BrandRS PRO
SGD2.98
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0.5 15 POM 2mm 4.5mm 7.5mm 3mm
RS Stock No. 521-6749
BrandRS PRO
SGD49.79
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1 24 Stainless Steel 8mm 20mm 24mm 10mm
RS Stock No. 521-6430
BrandRS PRO
SGD20.08
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1.5 18 Steel 8mm 22mm 27mm 15mm
RS Stock No. 521-6395
BrandRS PRO
SGD5.33
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1.5 12 Steel 8mm 21mm 18mm 15mm
RS Stock No. 521-7562
BrandRS PRO
SGD12.17
Each
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1 35 POM 6mm 14mm 35mm 6mm
RS Stock No. 521-6402
BrandRS PRO
SGD7.75
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1.5 15 Steel 8mm 18mm 22.5mm 15mm
RS Stock No. 521-7512
BrandRS PRO
SGD6.26
Each
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1 24 POM 5mm 11.7mm 24mm 6mm
RS Stock No. 521-7534
BrandRS PRO
SGD10.12
Each
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1 28 POM 5mm 11.7mm 28mm 6mm