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. 878-7837
BrandRS PRO
PHP272.35
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0.5 35 Steel 4mm 9mm 17.5mm 4mm
RS Stock No. 521-6727
BrandRS PRO
PHP1,220.13
Each
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1 18 Stainless Steel 8mm 20mm 18mm 10mm
RS Stock No. 521-7310
BrandRS PRO
PHP156.73
Each
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0.8 30 POM 6mm 12mm 24mm 4mm
RS Stock No. 521-6569
BrandRS PRO
PHP389.08
Each
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2 16 Steel 12mm 26mm 32mm 20mm
RS Stock No. 878-7897
BrandRS PRO
PHP555.31
Each
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1 10 Steel 6mm 12.5mm 10mm 5mm
RS Stock No. 521-6597
BrandRS PRO
PHP544.79
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2 20 Steel 12mm 32mm 40mm 20mm
RS Stock No. 521-6250
BrandRS PRO
PHP333.56
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1 22 Steel 8mm 18mm 22mm 10mm
RS Stock No. 521-7023
BrandRS PRO
PHP126.19
Each
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0.5 20 POM 4mm 8mm 10mm 3mm
RS Stock No. 521-6418
BrandRS PRO
PHP431.95
Each
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1.5 16 Steel 8mm 20mm 24mm 15mm
RS Stock No. 521-6777
BrandRS PRO
PHP1,526.27
Each
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1 40 Stainless Steel 10mm 35mm 40mm 10mm
RS Stock No. 521-6193
BrandRS PRO
PHP383.82
Each
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1 12 Steel 6mm 14mm 12mm 10mm
RS Stock No. 521-6402
BrandRS PRO
PHP322.75
Each
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1.5 15 Steel 8mm 18mm 22.5mm 15mm
RS Stock No. 521-7562
BrandRS PRO
PHP308.46
Each
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1 35 POM 6mm 14mm 35mm 6mm
RS Stock No. 878-7834
BrandRS PRO
PHP1,124.78
Each
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0.5 30 Steel 4mm 9mm 15mm 4mm
RS Stock No. 521-7102
BrandRS PRO
PHP117.17
Each
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0.5 36 POM 5mm 10mm 18mm 3mm
RS Stock No. 521-6575
BrandRS PRO
PHP464.31
Each
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2 18 Steel 12mm 30mm 36mm 20mm
RS Stock No. 521-6244
BrandRS PRO
PHP307.79
Each
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1 20 Steel 8mm 16mm 20mm 10mm
RS Stock No. 521-7326
BrandRS PRO
PHP129.49
Each
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0.8 32 POM 6mm 12mm 25.6mm 4mm
RS Stock No. 521-7168
BrandRS PRO
PHP157.74
Each
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0.5 56 POM 6mm 14mm 28mm 3mm
RS Stock No. 521-6761
BrandRS PRO
PHP1,462.09
Each
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1 30 Stainless Steel 8 → 16mm 25mm 30mm 10mm
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