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When a stripped or undersized gear brings your motor-driven project to a halt, you need a replacement that fits precisely and holds under load. This 1 Mod 50-tooth spur gear with set screws is engineered for hobbyists, makers, and small-machine builders who demand dimensional accuracy and repeatable torque transfer without play or slippage.
Each gear is machined from carbon steel and finished with a black oxide coating that reduces surface friction and provides baseline corrosion resistance. The module is 1 (Mod 1), tooth count is 50, and bore options span 6 mm (0.24 in) to 30 mm (1.18 in), including plain-bore and keyed variants with standard DIN keyway profiles (3×1.4 mm up to 8×3.3 mm). Set screws are included for secure shaft retention.
Typical use cases include DC motor output stages in CNC router Z-axes, gear-reduction stages in 3D-printer extruder drives, and custom robotic arm joints requiring a 1 Mod 50-tooth spur gear for precise angular positioning. The keyed bore variants suit applications where anti-rotation under reversing loads is critical.
Integrated set screw tapped into the hub locks the gear firmly onto the shaft, preventing axial and rotational slippage during operation.
Black oxide finish on carbon steel reduces galling and light surface oxidation while maintaining the hardness needed for sustained meshing loads.
Mod 1 tooth profile ensures direct interchangeability with any standard Mod 1 gear in your drivetrain. 50-tooth count delivers a defined gear ratio for speed-reduction or torque-multiplication stages.
Plain-bore variants cover 6, 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 22, 24, and 25 mm. Keyed variants add standard DIN keyway profiles from 3×1.4 mm to 8×3.3 mm for shafts 8–30 mm.
Select keyed variants include precision-cut DIN keyways, enabling positive torque transmission on keyed shafts without relying solely on set screw friction.
Tooth profile and bore are machined to Mod 1 standards, ensuring consistent pitch diameter and smooth meshing with mating gears across the full tooth engagement arc.
| Module | 1 (Mod 1) |
|---|---|
| Number of Teeth | 50 |
| Pitch Diameter | 50 mm (1.97 in) |
| Pressure Angle | 20° |
| Bore Diameter | 6–30 mm (0.24–1.18 in) — See variant options |
| Keyway | See variant options (plain bore or DIN keyed: 3×1.4 / 4×1.8 / 5×2.3 / 6×2.8 / 8×3.3 mm) |
| Material | Carbon Steel |
| Surface Finish | Black Oxide |
| Fastening | Set Screw (included) |
| Face Width | See variant options |
| Hub Diameter | See variant options |
| Overall Length | See variant options |
| Weight | See variant options |
Measure your shaft's outer diameter with a caliper. Select the matching bore size from the variant dropdown. If your shaft has a keyway, choose the corresponding keyed bore variant (e.g., 10 mm shaft with a 3×1.4 mm keyway → select "10mm Keyway (3×1.4mm)"). A plain bore with a set screw is sufficient for most low-to-medium torque applications.
Yes. Any gear marked Mod 1 (or 1M) with a 20° pressure angle will mesh correctly with this 50-tooth spur gear. Confirm the pressure angle of your mating gear before assembly — mixing 14.5° and 20° pressure angles causes poor contact and accelerated wear.
A keyed bore provides positive mechanical engagement between the gear and shaft, preventing rotation under reversing or shock loads where a set screw alone might loosen over time. For continuous-duty or high-torque applications, keyed variants are the more reliable choice. Plain bore with set screw is adequate for lighter, unidirectional loads.
Black oxide provides light corrosion resistance suitable for indoor and controlled environments. For outdoor, wet, or high-humidity applications, apply a light machine oil or grease to the gear surfaces after installation. For fully corrosion-resistant requirements, consider stainless steel alternatives.
The gear ratio equals the tooth count of the driven gear divided by the tooth count of the driving pinion. For example, pairing this 50-tooth gear with a 10-tooth pinion gives a 5:1 reduction ratio — the output shaft turns at 1/5 the input speed with 5× the torque (minus friction losses).
Yes. This 1 Mod 50-tooth spur gear is well-suited for extruder gear stages, CNC axis drives, and robotic joint assemblies where a Mod 1 gear train is already in use. Verify the bore matches your motor or idler shaft diameter and confirm the face width clears your frame geometry before ordering.
Set screws on gears in this size range typically use a hex (Allen) key drive. The exact thread size and key size depend on the bore variant selected. Contact us to confirm the set screw specification for your chosen variant before assembly.
