Main Drive Gear, 164T, MOD0.7 for ALIGN T-Rex 550/600/700 Series Helicopters

Product has been archived, and is no longer available for purchase. This page is for reference only.



The new Main Drive Gear is precision CNC-machined from a proprietary Nylatron MoS2-Filled Type 66 Polyamide, one of the best materials available today for polymer gears and the perfect match for an extremely strong, smooth running, and durable power transmission. The gear is composed of 164 teeth, utilizing the metric MOD0.7 tooth profile standard for various stock ALIGN series helicopters. Through months of testing, the gear has been optimized to include numerous design features for optimum performance, including:

  1. The tooth involute profile has been optimized through numerous design iterations for increased tooth engagement and strength, providing an incredibly quiet and durable gear for a MOD0.7 power train.
  2. Weight was reduced through FEA optimizations of the machining pattern to significantly reduce weight, while maintaining full strength of a solid-gear profile.
  3. The self-lubricating properties of the proprietary MoS2-Filled Type 66 Polyamide material provides exceptional wear and noise properties, providing a gear that can withstand the harsh nature of hardcore 3D flight.

Note: Review the corresponding gear case installation diagram for correct installation procedure for optimal strength and longevity.


Material: Nylatron Proprietary Type 66 Polyamide

Models: All ALIGN T-Rex 700N (V1/V2/3GX) and 700N E-Conversion series. Main Drive Gear can also be used for all T-Rex 600 and 550 series helicopters with the addition of the T700 Universal Main Gear Case (AT550/600-UMGC or AT550/600-MGC).


  • One (1) T-Rex 550/600/700 Series Main Drive Gear, 164T, MOD0.7

Finish: Precision CNC-machined, Nylatron Proprietary MoS2-Filled Type 66 Polyamide

Weight: 48 g (design is FEA optimized for maximum strength and minimum weight)

Comparison Matrix:

Standard Acetyl (POM) Resin Gears KDE Direct Nylatron Proprietary MoS2-Filled Type 66 Polyamide Gears Design Advantages of the KDE Direct Main Drive Gear, 164T, MOD0.7
Density 1.41
19% Less Weight
(Reduced weight to the helicopter)
Tensile Strength (Ultimate) 9,500
32% Stronger Tooth
(More power and torque capability)
Shear Strength 8,000
32% Stronger Tooth Root
(More power and torque capability)
Flexural Yield Strength 12,000
42% Stronger Tooth Root
(More power and torque capability)
Coefficient of Friction 0.250 0.200 20% Less Friction
(Less noise, more power transfer)
K (Wear) Factor 200E-10 90E-10 55% Less Wear
(Longer lasting gear)

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