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. 521-7023
BrandRS PRO
£2.51
Each
Units
0.5 20 POM 4mm 8mm 10mm 3mm
RS Stock No. 521-7146
BrandRS PRO
£3.27
Each
Units
0.5 50 POM 5mm 12mm 25mm 3mm
RS Stock No. 521-6985
BrandRS PRO
£1.36
Each
Units
0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 521-7045
BrandRS PRO
£2.33
Each
Units
0.5 25 POM 4mm 8mm 12.5mm 3mm
RS Stock No. 521-7225
BrandRS PRO
£4.31
Each
Units
0.5 80 POM 6mm 14mm 40mm 3mm
RS Stock No. 521-7174
BrandRS PRO
£2.31
Each
Units
0.5 60 POM 6mm 14mm 30mm 3mm
RS Stock No. 878-7815
BrandRS PRO
£5.53
Each
Units
0.5 10 Steel 2mm 7mm 5mm 5mm
RS Stock No. 521-7051
BrandRS PRO
£1.95
Each
Units
0.5 28 POM 4mm 8mm 14mm 3mm
RS Stock No. 521-7130
BrandRS PRO
£2.07
Each
Units
0.5 48 POM 5mm 12mm 24mm 3mm
RS Stock No. 521-7118
BrandRS PRO
£2.56
Each
Units
0.5 40 POM 5mm 12mm 20mm 3mm
RS Stock No. 521-6991
BrandRS PRO
£1.36
Each
Units
0.5 15 POM 2mm 4.5mm 7.5mm 3mm
RS Stock No. 521-7203
BrandRS PRO
£3.87
Each
Units
0.5 72 POM 6mm 14mm 36mm 3mm
RS Stock No. 878-7821
BrandRS PRO
£16.02
Each
Units
0.5 20 Steel 4mm 9mm 10mm 4mm
RS Stock No. 521-7067
BrandRS PRO
£2.43
Each
Units
0.5 30 POM 5mm 10mm 15mm 3mm
RS Stock No. 521-7001
BrandRS PRO
£1.36
Each
Units
0.5 16 POM 3mm 6mm 8mm 3mm
RS Stock No. 878-7828
BrandRS PRO
£15.04
Each
Units
0.5 15 Steel 4mm 9mm 7.5mm 5mm
RS Stock No. 521-7102
BrandRS PRO
£2.22
Each
Units
0.5 36 POM 5mm 10mm 18mm 3mm
RS Stock No. 521-7017
BrandRS PRO
£2.33
Each
Units
0.5 18 POM 3mm 6mm 9mm 3mm
RS Stock No. 521-7168
BrandRS PRO
£2.40
Each
Units
0.5 56 POM 6mm 14mm 28mm 3mm
RS Stock No. 521-7124
BrandRS PRO
£2.71
Each
Units
0.5 45 POM 5mm 12mm 22.5mm 3mm