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
PHP294.16
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0.5 35 Steel 4mm 9mm 17.5mm 4mm
RS Stock No. 521-6727
BrandRS PRO
PHP1,789.83
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1 18 Stainless Steel 8mm 20mm 18mm 10mm
RS Stock No. 521-7310
BrandRS PRO
PHP156.42
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0.8 30 POM 6mm 12mm 24mm 4mm
RS Stock No. 878-7897
BrandRS PRO
PHP471.58
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1 10 Steel 6mm 12.5mm 10mm 5mm
RS Stock No. 521-6777
BrandRS PRO
PHP2,237.29
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1 40 Stainless Steel 10mm 35mm 40mm 10mm
RS Stock No. 521-7023
BrandRS PRO
PHP189.88
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0.5 20 POM 4mm 8mm 10mm 3mm
RS Stock No. 521-6418
BrandRS PRO
PHP297.27
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1.5 16 Steel 8mm 20mm 24mm 15mm
RS Stock No. 521-6250
BrandRS PRO
PHP496.48
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1 22 Steel 8mm 18mm 22mm 10mm
RS Stock No. 521-6569
BrandRS PRO
PHP745.50
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2 16 Steel 12mm 26mm 32mm 20mm
RS Stock No. 521-6597
BrandRS PRO
PHP467.47
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2 20 Steel 12mm 32mm 40mm 20mm
RS Stock No. 521-6193
BrandRS PRO
PHP438.90
Each
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1 12 Steel 6mm 14mm 12mm 10mm
RS Stock No. 878-7821
BrandRS PRO
PHP1,210.08
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0.5 20 Steel 4mm 9mm 10mm 4mm
RS Stock No. 521-6749
BrandRS PRO
PHP1,824.85
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1 24 Stainless Steel 8 13mm 20mm 24mm 10mm
RS Stock No. 521-6402
BrandRS PRO
PHP279.37
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1.5 15 Steel 8mm 18mm 22.5mm 15mm
RS Stock No. 521-6799
BrandRS PRO
PHP3,026.37
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1 56 Stainless Steel 10mm 40mm 56mm 10mm
RS Stock No. 878-7828
BrandRS PRO
PHP1,136.15
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0.5 15 Steel 4mm 9mm 7.5mm 5mm
RS Stock No. 521-8543
BrandRS PRO
PHP7,506.40
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1 120 Stainless Steel 12mm 60mm 120mm 10mm
RS Stock No. 521-7168
BrandRS PRO
PHP181.32
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0.5 56 POM 6mm 14mm 28mm 3mm
RS Stock No. 521-6575
BrandRS PRO
PHP402.32
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2 18 Steel 12mm 30mm 36mm 20mm
RS Stock No. 521-7102
BrandRS PRO
PHP168.09
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0.5 36 POM 5mm 10mm 18mm 3mm
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RS Pro high quality steel spur gears in a range of gear ratios. Ideally used for speed reduction or increase, torque multiplication, resolution and accuracy in positioning systems. • Steel EN8 (080M40/080M46) or equivalent• Tensile strength: 569N/mm2 (min.)• 20° pressure ...
Stainless steel spur gears providing a range of ...
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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.