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. 521-6525
BrandRS PRO
HK$340.46
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1.5 60 Steel 15mm 50mm 90mm 15mm
RS Stock No. 182-7813
BrandRS PRO
HK$106.22
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1 26 Steel 8mm 20mm 26mm 15mm
RS Stock No. 521-7607
BrandRS PRO
HK$58.00
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1 45 POM 8mm 16mm 45mm 6mm
RS Stock No. 182-7954
BrandRS PRO
HK$218.23
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2 35 - 12mm 26mm 70mm 15mm
RS Stock No. 182-7894
BrandRS PRO
HK$202.78
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0.5 48 Steel 5mm 15mm 24mm 4mm
RS Stock No. 182-7864
BrandRS PRO
HK$89.32
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0.7 16 Steel 4mm 9mm 11.2mm 5mm
RS Stock No. 182-7938
BrandRS PRO
HK$155.94
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1.5 48 - 10mm 24mm 72mm 12mm
RS Stock No. 182-7809
BrandRS PRO
HK$95.11
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1 22 Steel 8mm 18mm 22mm 15mm
RS Stock No. 521-6339
BrandRS PRO
HK$128.73
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1 40 Steel 10mm 35mm 40mm 10mm
RS Stock No. 521-6676
BrandRS PRO
HK$373.04
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2 50 Steel 15mm 55mm 100mm 20mm
RS Stock No. 521-6698
BrandRS PRO
HK$808.55
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2 80 Steel 20mm 60mm 160mm 20mm
RS Stock No. 878-7875
BrandRS PRO
HK$100.91
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0.8 32 Steel 6mm 12mm 25.6mm 6mm
RS Stock No. 878-7831
BrandRS PRO
HK$165.75
Each
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0.5 40 Steel 4mm 9mm 20mm 4mm
RS Stock No. 521-7168
BrandRS PRO
HK$20.12
Each
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0.5 56 POM 6mm 14mm 28mm 3mm
RS Stock No. 182-7925
BrandRS PRO
HK$71.45
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1.5 16 - 6mm 14mm 24mm 12mm
RS Stock No. 182-7831
BrandRS PRO
HK$91.73
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1.5 15 Steel 8mm 18mm 22.5mm 17mm
RS Stock No. 878-7881
BrandRS PRO
HK$193.28
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0.8 50 Steel 8mm 19mm 40mm 6mm
RS Stock No. 182-7930
BrandRS PRO
HK$114.91
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1.5 28 - 8mm 19mm 42mm 12mm
RS Stock No. 182-7865
BrandRS PRO
HK$101.39
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0.7 20 Steel 4mm 10mm 14mm 5mm
RS Stock No. 182-7965
BrandRS PRO
HK$50.21
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1 16 - 4mm 9mm 16mm 9mm