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. 521-6402
BrandRS PRO
R 147.04
Each
units
1.5 15 Steel 8mm 18mm 22.5mm 15mm
RS stock no. 521-6480
BrandRS PRO
R 381.02
Each
units
1.5 36 Steel 10mm 45mm 54mm 15mm
RS stock no. 521-7253
BrandRS PRO
R 39.10
Each
units
0.8 16 POM 4mm 8mm 12.8mm 4mm
RS stock no. 521-6749
BrandRS PRO
R 426.56
Each
units
1 24 Stainless Steel 8 → 13mm 20mm 24mm 10mm
RS stock no. 521-7635
BrandRS PRO
R 114.39
Each
units
1 56 POM 8mm 18mm 56mm 6mm
RS stock no. 521-7449
BrandRS PRO
R 99.93
Each
units
0.8 72 POM 6mm 15.5mm 57.6mm 4mm
RS stock no. 521-6676
BrandRS PRO
R 866.29
Each
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2 50 Steel 15mm 55mm 100mm 20mm
RS stock no. 878-7900
BrandRS PRO
R 175.41
Each
units
1 15 Steel 6mm 14mm 15mm 5mm
RS stock no. 521-7534
BrandRS PRO
R 84.83
Each
units
1 28 POM 5mm 11.7mm 28mm 6mm
RS stock no. 521-6345
BrandRS PRO
R 374.04
Each
units
1 44 Steel 10mm 35mm 44mm 10mm
RS stock no. 878-7893
BrandRS PRO
R 615.84
Each
units
0.8 80 Steel 10mm 22mm 64mm 6mm
RS stock no. 521-7360
BrandRS PRO
R 55.96
Each
units
0.8 48 POM 6mm 14.5mm 38.4mm 4mm
RS stock no. 521-7584
BrandRS PRO
R 101.53
Each
units
1 40 POM 8mm 16mm 40mm 6mm
RS stock no. 521-7455
BrandRS PRO
R 105.93
Each
units
0.8 80 POM 6mm 15.5mm 64mm 4mm
RS stock no. 521-7017
BrandRS PRO
R 41.37
Each
units
0.5 18 POM 3mm 6mm 9mm 3mm
RS stock no. 521-7124
BrandRS PRO
R 47.44
Each
units
0.5 45 POM 5mm 12mm 22.5mm 3mm
RS stock no. 521-6654
BrandRS PRO
R 589.82
Each
units
2 40 Steel 15mm 55mm 80mm 20mm
RS stock no. 521-6446
BrandRS PRO
R 200.35
Each
units
1.5 20 Steel 8mm 24mm 30mm 15mm
RS stock no. 521-6799
BrandRS PRO
R 719.55
Each
units
1 56 Stainless Steel 10mm 40mm 56mm 10mm
RS stock no. 521-6626
BrandRS PRO
R 427.28
Each
units
2 32 Steel 12mm 50mm 64mm 20mm