Product Description
šŸ”© Product Overview Upgrade or replace your worn transmission gears with this precision Mod 1 (1M) 12-tooth pinion / spur gear. Machined from high-quality carbon steel (typically 45# steel) with a black-oxide / blackened finish for added wear and corrosion resistance, it delivers solid torque transfer and long service life in RC, robotics, and small mechanical drives .
šŸ“ Key Specifications
  • Module: 1 (Metric Mod 1 / 1M)
  • Teeth: 12T (Straight tooth / spur profile)
  • Bore (Inner Hole): 4 / 5 / 6 / 6.35 / 7 mm options (select the bore to match your shaft)
  • Outer Diameter: ~14 mm
  • Face / Tooth Height: ~12 mm (overall height ~18 mm depending on batch)
  • Material: Carbon Steel (45# / C45 equivalent), black finish
  • Fixing: Supplied with grub/set screws (usually M4 x 2) for secure shaft locking
  • Tooth form: Straight (spur), 20° pressure angle standard
āš™ļø Features & Benefits
  • Stronger and more wear-resistant than stock plastic or aluminium pinions—ideal for high-torque brushless / brushed motor setups .
  • Precision hobbed teeth for smooth mesh, low noise, and efficient power transmission .
  • Set-screw style mounting (no press-fit hassle); use thread-locker for vibration-heavy applications .
  • Multiple bore sizes (4–7 mm) to fit common RC motor shafts, DIY motors, and mechanical shafts .
  • Great for tuning gear ratios: 12T gives a balanced blend of acceleration and top-end speed on 1/8-scale RC and similar platforms (always pair with a matching Mod 1 spur) .
šŸŽÆ Typical Applications
  • 1/8-scale RC cars, trucks, buggies, truggies (as motor pinion, diff/transmission gear) .
  • Robotics, CNC/3D-printer motion tweaks, automation jigs, and small gearboxes .
  • DIY electronics, motor shaft couplings, and prototype mechanical projects .
  • Replacement for stripped/worn 12T Mod-1 gears in hobby and light-industrial use .
šŸ”§ Installation Tips
  1. Confirm your mating spur gear is also Module 1 (different modules do not mesh correctly) .
  2. Select the gear with the bore that matches your motor/ shaft diameter (4–7 mm).
  3. Slide onto the shaft, align set screws with any flat/key area if present, and tighten firmly with the appropriate hex key; add thread-locker if used in high-vibration RC environments .
  4. Check gear mesh (backlash) and lubricate as needed; monitor motor temp after changing gear ratio .

ā€» Please note: We specialise in the production of various hardware accessories, hardware tools and mechanical transmission system components. If you have any other needs, please contact me and we will solve your problem promptly!

ā–² Tips:

ā—† All pictures are professionally colour-coded, but due to the different ambient light and display device settings, there may be some discrepancies between the displayed pictures and the items themselves. Please understand this.

ā—† The data is measured manually. There may be deviations, but this has no effect on use.
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