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. 521-7398
BrandRS PRO
MYR16.75
Each
units
0.8 56 POM 6mm 14.5mm 44.8mm 4mm
RS Stock No. 521-7146
BrandRS PRO
MYR14.43
Each
units
0.5 50 POM 5mm 12mm 25mm 3mm
RS Stock No. 521-6317
BrandRS PRO
MYR50.60
Each
units
1 32 Steel 10mm 26mm 32mm 10mm
RS Stock No. 521-7506
BrandRS PRO
MYR20.30
Each
units
1 20 POM 5mm 11.7mm 20mm 6mm
RS Stock No. 878-7865
BrandRS PRO
MYR43.86
Each
units
0.8 20 Steel 6mm 12mm 16mm 6mm
RS Stock No. 521-7534
BrandRS PRO
MYR21.42
Each
units
1 28 POM 5mm 11.7mm 28mm 6mm
RS Stock No. 521-7584
BrandRS PRO
MYR25.13
Each
units
1 40 POM 8mm 16mm 40mm 6mm
RS Stock No. 521-6553
BrandRS PRO
MYR26.59
Each
units
2 15 Steel 12mm 24mm 30mm 20mm
RS Stock No. 521-6569
BrandRS PRO
MYR33.97
Each
units
2 16 Steel 12mm 26mm 32mm 20mm
RS Stock No. 521-7641
BrandRS PRO
MYR46.34
Each
units
1 60 POM 8mm 18mm 60mm 6mm
RS Stock No. 521-6604
BrandRS PRO
MYR52.89
Each
units
2 24 Steel 12mm 38mm 48mm 20mm
RS Stock No. 521-6294
BrandRS PRO
MYR46.58
Each
units
1 28 Steel 8mm 22mm 28mm 10mm
RS Stock No. 521-7461
BrandRS PRO
MYR15.05
Each
units
1 12 POM 4mm 8mm 12mm 6mm
RS Stock No. 878-7878
BrandRS PRO
MYR52.69
Each
units
0.8 25 Steel 6mm 12mm 20mm 6mm
RS Stock No. 521-7253
BrandRS PRO
MYR10.88
Each
units
0.8 16 POM 4mm 8mm 12.8mm 4mm
RS Stock No. 521-7304
BrandRS PRO
MYR15.22
Each
units
0.8 28 POM 5mm 10mm 22.4mm 4mm
RS Stock No. 878-7831
BrandRS PRO
MYR86.81
Each
units
0.5 40 Steel 4mm 9mm 20mm 4mm
RS Stock No. 521-6991
BrandRS PRO
MYR9.55
Each
units
0.5 15 POM 2mm 4.5mm 7.5mm 3mm
RS Stock No. 521-6266
BrandRS PRO
MYR38.25
Each
units
1 24 Steel 8mm 20mm 24mm 10mm
RS Stock No. 521-7679
BrandRS PRO
MYR47.48
Each
units
1 70 POM 8mm 18mm 70mm 6mm
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Steel EN8 (080M40/080M46) or equivalent20° pressure angleDIN Standard ...
Description:
Steel EN8 (080M40/080M46) or equivalent20° pressure angleDIN Standard - DIN 867, DIN 3962, DIN 3963, Grade / Quality 9 or equivalentStandard tolerance, unless otherwise stated ±0.25mm.