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 have been specifically designed to transmit large amounts of power by placing them on parallel shafts which rotate in opposite directions.
Spur gears have an involute profile with straight teeth 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.
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”.
So what are the advantages?
• 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
• Power plants
• 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 mills
• Rolling mills
Spur gears are however very loud and so will not be found in vehicles. When the teeth collide with each other there is an impact noise which is really loud compared to the helical gears found in cars.

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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
SGD40.28
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units
1 44 Steel 10mm 35mm 44mm 10mm
RS Stock No. 521-6222
BrandRS PRO
SGD13.40
Each
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1 16 Steel 8mm 18mm 16mm 10mm
RS Stock No. 521-7231
BrandRS PRO
SGD2.59
Each
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0.8 12 POM 3mm 6mm 9.6mm 4mm
RS Stock No. 521-7310
BrandRS PRO
SGD4.03
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0.8 30 POM 6mm 12mm 24mm 4mm
RS Stock No. 521-6985
BrandRS PRO
SGD2.65
Each
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0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 521-6301
BrandRS PRO
SGD28.44
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1 30 Steel 10mm 25mm 30mm 10mm
RS Stock No. 521-7326
BrandRS PRO
SGD4.67
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0.8 32 POM 6mm 12mm 25.6mm 4mm
RS Stock No. 521-6244
BrandRS PRO
SGD17.29
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1 20 Steel 8mm 16mm 20mm 10mm
RS Stock No. 521-6682
BrandRS PRO
SGD123.14
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2 60 Steel 15mm 60mm 120mm 20mm
RS Stock No. 521-7405
BrandRS PRO
SGD9.44
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0.8 60 POM 6mm 14.5mm 48mm 4mm
RS Stock No. 521-7247
BrandRS PRO
SGD2.59
Each
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0.8 15 POM 3mm 6mm 12mm 4mm
RS Stock No. 521-7304
BrandRS PRO
SGD3.97
Each
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0.8 28 POM 5mm 10mm 22.4mm 4mm
RS Stock No. 521-7461
BrandRS PRO
SGD4.99
Each
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1 12 POM 4mm 8mm 12mm 6mm
RS Stock No. 521-7540
BrandRS PRO
SGD10.00
Each
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1 30 POM 6mm 14mm 30mm 6mm
RS Stock No. 521-8543
BrandRS PRO
SGD193.30
Each
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1 120 Stainless Steel 12mm 60mm 120mm 10mm
RS Stock No. 521-6755
BrandRS PRO
SGD46.99
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1 25 Stainless Steel 8 13mm 20mm 25mm 10mm
RS Stock No. 521-6238
BrandRS PRO
SGD15.09
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1 18 Steel 8mm 20mm 18mm 10mm
RS Stock No. 521-6272
BrandRS PRO
SGD20.96
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1 25 Steel 8mm 20mm 25mm 10mm
RS Stock No. 878-7926
BrandRS PRO
SGD32.39
Each
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1 60 Steel 6mm 14mm 60mm 5mm
RS Stock No. 521-7360
BrandRS PRO
SGD5.69
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0.8 48 POM 6mm 14.5mm 38.4mm 4mm
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