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. 521-6985
BrandRS PRO
HK$15.10
Each
units
0.5 12 POM 2mm 4.5mm 6mm 3mm
RS Stock No. 878-7819
BrandRS PRO
HK$173.09
Each
units
0.5 12 Steel 3mm 8mm 6mm 5mm
RS Stock No. 521-7578
BrandRS PRO
HK$66.47
Each
units
1 36 POM 6mm 14mm 36mm 6mm
RS Stock No. 521-6301
BrandRS PRO
HK$162.33
Each
units
1 30 Steel 10mm 25mm 30mm 10mm
RS Stock No. 878-7862
BrandRS PRO
HK$99.99
Each
units
0.8 18 Steel 5mm 12 14.4mm 6
RS Stock No. 521-7130
BrandRS PRO
HK$22.99
Each
units
0.5 48 POM 5mm 12mm 24mm 3mm
RS Stock No. 521-7348
BrandRS PRO
HK$39.47
Each
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0.8 36 POM 6mm 12mm 28.8mm 4mm
RS Stock No. 521-7039
BrandRS PRO
HK$25.85
Each
units
0.5 24 POM 4mm 8mm 12mm 3mm
RS Stock No. 521-6749
BrandRS PRO
HK$268.27
Each
units
1 24 Stainless Steel 8 13mm 20mm 24mm 10mm
RS Stock No. 521-7691
BrandRS PRO
HK$69.56
Each
units
1 80 POM 8mm 18mm 80mm 6mm
RS Stock No. 521-7512
BrandRS PRO
HK$33.18
Each
units
1 24 POM 5mm 11.7mm 24mm 6mm
RS Stock No. 878-7815
BrandRS PRO
HK$61.43
Each
units
0.5 10 Steel 2mm 7mm 5mm 5mm
RS Stock No. 521-7001
BrandRS PRO
HK$15.10
Each
units
0.5 16 POM 3mm 6mm 8mm 3mm
RS Stock No. 521-6446
BrandRS PRO
HK$122.75
Each
units
1.5 20 Steel 8mm 24mm 30mm 15mm
RS Stock No. 521-6452
BrandRS PRO
HK$149.06
Each
units
1.5 24 Steel 8mm 28mm 36mm 15mm
RS Stock No. 182-7962
BrandRS PRO
HK$48.275
Each (In a Pack of 2)
units
1 14 - 4mm 9mm 14mm 9mm
RS Stock No. 182-7946
BrandRS PRO
HK$82.53
Each
units
2 16 - 8mm 17.5mm 32mm 15mm
RS Stock No. 521-7483
BrandRS PRO
HK$36.26
Each
units
1 16 POM 5mm 10mm 16mm 6mm
RS Stock No. 182-7871
BrandRS PRO
HK$183.45
Each
units
0.7 36 Steel 5mm 15mm 25.2mm 5mm
RS Stock No. 182-7947
BrandRS PRO
HK$87.82
Each
units
2 18 - 8mm 17.5mm 36mm 15mm
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