INJORA INJS15 15KG Waterproof Coreless High Torque Micro Servo for 1/18 & 1/24 RC Crawler Upgrade

Meet the INJORA INJS15 15KG Waterproof Coreless High Torque Micro Servo, a compact upgrade designed for 1/18 and 1/24 scale crawlers. Its CNC-machined aluminum case provides rigidity and helps dissipate heat during extended sessions, while a coreless motor delivers fast response and steady output for precise control. Stainless steel gears ensure reliable performance as you tackle uneven terrain, rocks, and gates. The waterproof design adds resilience to damp trails and sprays, so you can focus on the line rather than the weather. At just 22 g in a compact 23×12×27.5 mm footprint, the INJS15 slides into tight chassis spaces without sacrificing capability. A 250 mm lead length gives you flexible routing in most builds. The unit uses 2BB bearings to minimize play and keep steering smooth over time. The package includes one INJS15 Coreless Servo, ready to install, with a standard Φ4.9 mini 25T spline to fit many micro linkages.

Key features and design quality

• CNC-machined aluminum case for strength and heat management.
• Coreless motor for fast response and stable output.
• Stainless steel gears for reliable long-term use.
• High torque output supports heavier micro crawler builds.
• Waterproof design for all-weather operation.

Specifications at a glance

• Operating voltage: 6V–7.4V
• Torque: 15.2 kg.cm at 6V; 17.7 kg.cm at 7.4V
• Speed: 0.091 sec/60° at 6V; 0.073 sec/60° at 7.4V
• RC angle: 90° ±5°
• Travel range: 180° ±5° with 500–2500 μs pulse width
• Motor: Coreless
• Gears: Stainless steel
• Spline: Φ4.9 Mini 25T
• Bearings: 2BB
• Lead length: 250 mm
• Size: 23×12×27.5 mm
• Weight: 22 g
• Waterproof: Yes

Real-world use and installation tips

For micro crawlers, the INJS15 can handle steering duties in tight sections and provide meaningful torque when climbing over small obstacles. The compact size helps maintain weight balance, and the 250 mm lead makes wiring easier in many chassis layouts. When upgrading an existing micro servo, check spline compatibility (25T) and ensure your PWM settings allow the full 500–2500 μs range for broad steering travel.

What’s in the box

• 1 × INJS15 Coreless Servo