STEAM AK4211

The STEAM AK4211 is an 81T matte-black metal tail-drive main gear for AK420 helicopters. Fully CNC machined from 6061T6 aluminum alloy, it features precision-hobbed teeth, split mortise-and-tenon construction and an embedded washer design. A mounting seat and fastening hardware are supplied.

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Material: 6061T6 aluminum alloy

Product overview

The STEAM AK4211 is a matte-black, 81T metal tail-drive main gear for the AK420 helicopter. Made from 6061T6 aluminum alloy, it combines full CNC machining with high-precision CNC gear hobbing. Its split mortise-and-tenon construction incorporates an overall reinforced large frame, while an embedded washer structure helps make installation easier.

Supplied components comprise one Φ12×Φ51×6mm AK420 metal tail-drive main gear and one 21×21.5×11mm tail-drive main gear mounting seat. The accompanying hardware includes three M2.5×4.8mm nickel-plated hex-socket shoulder screws and one M3×16mm socket-head hex screw with an internal shaft sleeve.

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Specifications

STEAM AK4211 specifications
Specification	Value & conditions
Model	STEAM AK4211
Product type	AK420 metal tail-drive main gear
Compatibility	AK420 helicopter
Tooth count	81T
Finish	Matte black
Material	6061T6 aluminum alloy
Manufacturing	Fully CNC machined with high-precision CNC gear hobbing
Structural design	Split mortise-and-tenon design with an overall reinforced large frame
Washer design	Embedded washer structure for easier installation
Tail-drive main gear	AK420 metal tail-drive main gear, Φ12×Φ51×6mm ×1Included equipment.
Main gear mounting seat	AK420 tail-drive main gear mounting seat, 21×21.5×11mm ×1Included equipment.
Nickel-plated shoulder screws	M2.5×4.8mm nickel-plated hex-socket shoulder screws ×3Included equipment.
Sleeved socket-head screw	M3×16mm socket-head hex screw with internal shaft sleeve ×1Included equipment.