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The Martin high carbon steel spur gear with 20-degree pressure angle (PA) and a diametral pitch (DP) of 20 transmits torque between parallel shafts to provide rotational power to another part of a motorized system. It has a 20-degree pressure angle for lower contact ratio between gears, resulting in higher load capacity than smaller pressure angles, and a 20-diametral pitch for applications requiring a balance between transferring torque and controlling changes in speed and direction of rotation with precision. This spur gear, which can mesh only with spur gears that have the same pressure angle and diametral pitch, is made of high carbon steel for tensile strength and hardness. This Martin spur gear is suitable for use in a variety of commercial and industrial applications, such as construction equipment, aeronautics, conveyors, and manufacturing equipment, among others.
Spur gears, the most common gear type, have a circular or cylindrical shape with teeth bordering the outer perimeter and are used for transmitting rotational torque and motion between parallel rotating shafts. A spur gear's pressure angle (PA), diametral pitch (also called DP or pitch), and its material are important factors to consider when purchasing. Gears come in several types for use in different power transmission configurations and for different applications, including bevel and miter gears (for rotating shafts perpendicular to each other), change gears (to increase or decrease torque and speed), helical gears (for high rates of rotational speed), internal gears (where one gear is nested inside the other), rack and pinion gears (for turning rotational motion into linear motion), and worm gears (for perpendicular shafts in tight spaces and quiet operation). Gears are suitable for use in the agriculture, automotive, construction, mining, and packaging industries, and can be found in a variety of machines, including bicycles, automobiles, and elevators, among others.
Martin Sprocket & Gear manufactures power transmission and conveying products. The company was founded in 1951 and is headquartered in Arlington, TX. Martin provides tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut für Normung (DIN) standards.
Dan J Friedrich
Reviewed in the United States on February 12, 2024
Bore is accurate, but I had to broach key slot.
Jimbo
Reviewed in the United States on March 6, 2023
Product picture shows gear with keyway and set screw (or at least shows a hole for one). Gear I received has neither a keyway or set screw. Nbd for me as all I really need is a set screw and I can drill/tap a hole. But if you are expecting what’s pictured maybe adjust expectations. Otherwise it’s fine
Billy Faubion
Reviewed in the United States on March 28, 2018
Took some modification but worked for my purpose.
Richard Schulz
Reviewed in the United States on May 12, 2014
Well described online, is exactly what I needed. Strong, high-quality metal, yet machinable for modification. I will definitely purchase similar parts in the future.
nashmetal
Reviewed in the United States on June 18, 2012
I priced the same item from Rush Gears and their price was over a $1000.00 higher! I'm glad I found this one!
sanderson386
Reviewed in the United States on December 19, 2011
when my gears backed up on my saw. i was told junk it you will never get parts, they were discontinued years ago then when i saw a review on the saw i noticed where another person found these gears on amazon so i ordered right away and now up and runningwill be shopping againthanks
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