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. 521-6468
BrandRS PRO
SGD37.17
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units
1.5 30 Steel 10mm 38mm 45mm 15mm
RS Stock No. 182-7939
BrandRS PRO
SGD29.41
Each
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1.5 50 - 12mm 27mm 75mm 12mm
RS Stock No. 182-7977
BrandRS PRO
SGD17.25
Each
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1 48 - 8mm 18mm 48mm 9mm
RS Stock No. 521-6727
BrandRS PRO
SGD48.80
Each
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1 18 Stainless Steel 8mm 20mm 18mm 10mm
RS Stock No. 182-7980
BrandRS PRO
SGD21.48
Each
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1 55 - 8mm 21mm 55mm 9mm
RS Stock No. 182-7832
BrandRS PRO
SGD12.24
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1.5 16 Steel 8mm 20mm 24mm 17mm
RS Stock No. 521-7499
BrandRS PRO
SGD7.32
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1 18 POM 5mm 10mm 18mm 6mm
RS Stock No. 182-7830
BrandRS PRO
SGD16.49
Each
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1.5 14 Steel 8mm 17mm 21mm 17mm
RS Stock No. 182-7908
BrandRS PRO
SGD4.395
Each (In a Pack of 2)
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0.7 30 - 6mm 12mm 21mm 6mm
RS Stock No. 182-7842
BrandRS PRO
SGD37.43
Each
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1.5 32 Steel 12mm 35mm 48mm 17mm
RS Stock No. 182-7829
BrandRS PRO
SGD11.30
Each
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1.5 13 Steel 8mm 14mm 19.5mm 17mm
RS Stock No. 182-7827
BrandRS PRO
SGD15.60
Each
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1.5 12 Steel 8mm 14mm 18mm 17mm
RS Stock No. 182-7906
BrandRS PRO
SGD3.767
Each (In a Pack of 3)
units
0.7 28 - 6mm 9mm 19.6mm 6mm