A-Plate Metric Spur Gear Size Chart
If you are working in manufacturing, automation, or maintenance, getting the right gear matters. This chart from MDS of Michigan gives you a quick, reliable way to find the exact size you need without digging through catalogs.
Below is a complete breakdown of 20° A-Plate Metric Spur Gears manufactured by PTI. Used across industries like manufacturing, packaging, food processing, and material handling, these gears offer a strong, efficient solution with a 20° pressure angle for smooth, reliable performance. Custom sizes available upon request.
20° A-Plate Metric Spur Gears Sizes
Here is a breakdown of our metric A-Plate spur gears from PTI, including their part numbers, diametral pitch, number of teeth, and outer diameters (OD).
All of our A-plate metric spur gears have a 20 degree pressure angle. The pressure angle in a spur gear is the angle between the line of action (where force is transmitted between gears) and a line tangent to the pitch circle. When a gear has a 20° pressure angle, it means:
- The force between meshing teeth is transmitted along a line tilted 20 degrees from the tangent of the pitch circle.
- This angle directly affects strength, load capacity, noise, and alignment sensitivity.
Click the the part numbers below to learn more about each size:
| Part # | Diametral Pitch | Number of Teeth | Outside Diameter |
| M1A60 | 120 | 60 | 62MM |
| M1A70 | 140 | 70 | 72MM |
| M1A72 | 144 | 72 | 74MM |
| M1A75 | 150 | 75 | 77MM |
| M1A76 | 152 | 76 | 78MM |
| M1A85 | 170 | 85 | 87MM |
| M1A90 | 180 | 90 | 92MM |
| M1A100 | 200 | 100 | 102MM |
| M1.5A76 | 152 | 76 | 117MM |
| M1.5A80 | 160 | 80 | 123MM |
| M1A127 | 254 | 127 | 129MM |
| M1.5A85 | 170 | 85 | 130.5MM |
| M2A72 | 144 | 72 | 148MM |
| M3A48 | 96 | 48 | 150MM |
| M2A75 | 150 | 75 | 154MM |
| M3A50 | 100 | 50 | 156MM |
| M3A52 | 104 | 52 | 162MM |
| M2A80 | 160 | 80 | 164MM |
| M4A40 | 80 | 40 | 168MM |
| M5A32 | 64 | 32 | 170MM |
| M1.5A114 | 228 | 114 | 174MM |
| M2A90 | 180 | 90 | 184MM |
| M5A35 | 70 | 35 | 185MM |
| M3A60 | 120 | 60 | 186MM |
| M4A45 | 90 | 45 | 188MM |
| M6A30 | 60 | 30 | 192MM |
| M2A95 | 190 | 95 | 194MM |
| M5A38 | 76 | 38 | 200MM |
| M4A48 | 96 | 48 | 200MM |
| M2A100 | 200 | 100 | 204MM |
| M4A50 | 100 | 50 | 208MM |
| M5A40 | 80 | 40 | 210MM |
| M4A52 | 104 | 52 | 216MM |
| M3A70 | 140 | 70 | 216MM |
| M3A72 | 144 | 72 | 222MM |
| M2A110 | 220 | 110 | 224MM |
| M4A55 | 110 | 55 | 228MM |
| M3A75 | 150 | 75 | 231MM |
| M2A114 | 228 | 114 | 232MM |
| M2A120 | 240 | 120 | 244MM |
| M2.5A100 | 200 | 100 | 255MM |
| M2A127 | 254 | 127 | 258MM |
| M4A65 | 130 | 65 | 268MM |
| M3A90 | 180 | 90 | 276MM |
| M2.5A120 | 240 | 120 | 305MM |
| M3A100 | 200 | 100 | 306MM |
| M4A80 | 160 | 80 | 328MM |
| M4A114 | 228 | 114 | 464MM |
Why Choose A-Plate Metric Spur Gears?
Design: Plate spur gears feature a flat, compact profile with straight teeth cut parallel to the shaft. The involute tooth form ensures smooth, efficient power transmission between parallel shafts.
Mounting: These gears are designed with a central bore for direct mounting. They can be secured using keyways, set screws, or bolting to a plate—making them a great solution where space is limited and precision alignment is critical.
Materials: Commonly manufactured from high-strength steel (such as C45) for durability and torque capacity. For lighter-duty or noise-sensitive applications, engineered plastics like POM (acetal) are also used to reduce wear and operating noise.
Performance: Plate spur gears deliver excellent efficiency—typically between 94% and 98%—making them a reliable choice for consistent power transmission.
Applications: Ideal for low-speed to moderate torque environments where compact design is important. Frequently used in automation systems, robotics, packaging equipment, and general industrial machinery.
At MDS of Michigan, plate spur gears are available in a wide range of metric modules and tooth counts to match your exact application requirements. Whether you need durability, precision, or quiet operation, we can help you find the right gear solution. Click the product links above or if you are unsure which size is right for your machinery, Click Here to contact us today!
