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. 521-6345
BrandRS PRO
SGD42.88
Each
units
1 44 Steel 10mm 35mm 44mm 10mm
RS Stock No. 521-6222
BrandRS PRO
SGD14.91
Each
units
1 16 Steel 8mm 18mm 16mm 10mm
RS Stock No. 521-7310
BrandRS PRO
SGD4.52
Each
units
0.8 30 POM 6mm 12mm 24mm 4mm
RS Stock No. 521-7231
BrandRS PRO
SGD2.83
Each
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0.8 12 POM 3mm 6mm 9.6mm 4mm
RS Stock No. 521-6985
BrandRS PRO
SGD3.64
Each
units
0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 521-6244
BrandRS PRO
SGD15.22
Each
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1 20 Steel 8mm 16mm 20mm 10mm
RS Stock No. 521-6301
BrandRS PRO
SGD30.32
Each
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1 30 Steel 10mm 25mm 30mm 10mm
RS Stock No. 521-6682
BrandRS PRO
SGD131.10
Each
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2 60 Steel 15mm 60mm 120mm 20mm
RS Stock No. 521-7326
BrandRS PRO
SGD4.97
Each
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0.8 32 POM 6mm 12mm 25.6mm 4mm
RS Stock No. 521-7405
BrandRS PRO
SGD10.05
Each
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0.8 60 POM 6mm 14.5mm 48mm 4mm
RS Stock No. 521-7304
BrandRS PRO
SGD4.35
Each
units
0.8 28 POM 5mm 10mm 22.4mm 4mm
RS Stock No. 521-7247
BrandRS PRO
SGD2.83
Each
units
0.8 15 POM 3mm 6mm 12mm 4mm
RS Stock No. 521-7461
BrandRS PRO
SGD5.33
Each
units
1 12 POM 4mm 8mm 12mm 6mm
RS Stock No. 521-7540
BrandRS PRO
SGD10.65
Each
units
1 30 POM 6mm 14mm 30mm 6mm
RS Stock No. 521-6755
BrandRS PRO
SGD50.03
Each
units
1 25 Stainless Steel 8mm 20mm 25mm 10mm
RS Stock No. 521-8543
BrandRS PRO
SGD176.04
Each
units
1 120 Stainless Steel 12mm 60mm 120mm 10mm
RS Stock No. 521-6272
BrandRS PRO
SGD22.33
Each
units
1 25 Steel 8mm 20mm 25mm 10mm
RS Stock No. 521-6238
BrandRS PRO
SGD16.12
Each
units
1 18 Steel 8mm 20mm 18mm 10mm
RS Stock No. 521-7360
BrandRS PRO
SGD6.26
Each
units
0.8 48 POM 6mm 14.5mm 38.4mm 4mm
RS Stock No. 878-7926
BrandRS PRO
SGD34.61
Each
units
1 60 Steel 6mm 14mm 60mm 5mm