Spur Gears

Spur gears, also known as straight-cut gears, are a common type of gear used in a wide range of applications. They are designed to transmit large amounts of power by placing them on parallel shafts which rotate in opposite directions.


Spur gears consist of a cylinder with teeth around the outer edge. They 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. The size of the spur gear is described as "module".


  • 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.

  • What are the advantages of a spur gear?

    High transmission efficiencyCompact and very easy to installConstant velocity ratioNo slippage unlike belt drivesHighly reliableCan transmit large amounts of power

  • Where are spur gears used?

    Metal cutting machinesMarine enginesMechanical clocks and watchesFuel pumpsWashing machinesGear motors and gear pumpsRack and pinion mechanismsMaterial handling equipmentAutomobile gear boxesSteel 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. 521-6193
BrandRS PRO
£6.10
Each
Units
1 12 Steel 6mm 14mm 12mm 10mm
RS Stock No. 521-7023
BrandRS PRO
£2.64
Each
Units
0.5 20 POM 4mm 8mm 10mm 3mm
RS Stock No. 521-6244
BrandRS PRO
£9.33
Each
Units
1 20 Steel 8mm 16mm 20mm 10mm
RS Stock No. 521-7461
BrandRS PRO
£2.69
Each
Units
1 12 POM 4mm 8mm 12mm 6mm
RS Stock No. 521-6373
BrandRS PRO
£38.86
Each
Units
1 60 Steel 10mm 35mm 60mm 10mm
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
£1.43
Each
Units
0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 521-7477
BrandRS PRO
£3.12
Each
Units
1 15 POM 4mm 8mm 15mm 6mm
RS Stock No. 878-7897
BrandRS PRO
£6.24
Each
Units
1 10 Steel 6mm 12.5mm 10mm 5mm
RS Stock No. 878-7904
BrandRS PRO
£10.04
Each
Units
1 20 Steel 6mm 14mm 20mm 5mm
RS Stock No. 521-6806
BrandRS PRO
£86.52
Each
Units
1 100 Stainless Steel 12mm 60mm 100mm 10mm
RS Stock No. 521-7045
BrandRS PRO
£2.33
Each
Units
0.5 25 POM 4mm 8mm 12.5mm 3mm
RS Stock No. 521-7691
BrandRS PRO
£12.39
Each
Units
1 80 POM 8mm 18mm 80mm 6mm
RS Stock No. 878-7926
BrandRS PRO
£16.71
Each
Units
1 60 Steel 6mm 14mm 60mm 5mm
RS Stock No. 521-7641
BrandRS PRO
£9.90
Each
Units
1 60 POM 8mm 18mm 60mm 6mm
RS Stock No. 521-7506
BrandRS PRO
£3.96
Each
Units
1 20 POM 5mm 11.7mm 20mm 6mm
RS Stock No. 521-6597
BrandRS PRO
£6.55
Each
Units
2 20 Steel 12mm 32mm 40mm 20mm
RS Stock No. 521-7231
BrandRS PRO
£1.33
Each
Units
0.8 12 POM 3mm 6mm 9.6mm 4mm
RS Stock No. 521-7310
BrandRS PRO
£2.17
Each
Units
0.8 30 POM 6mm 12mm 24mm 4mm
RS Stock No. 521-7483
BrandRS PRO
£3.43
Each
Units
1 16 POM 5mm 10mm 16mm 6mm