Radient RS-SM118-PG Sub-Micro 6g Analog Servo 4.8V 6.0V RC RDNA0407

Overview

The Radient RS-SM118-PG Sub-Micro 6g Analog Servo (part number RDNA0407) is a compact, lightweight servo designed specifically for RC enthusiasts who need precision control in tight spaces. This sub-micro servo is engineered to deliver reliable performance in small-scale RC applications, making it an ideal choice for anyone building or upgrading RC cars, planes, helicopters, or other radio-controlled models that demand compact servo solutions. Whether you're a seasoned RC enthusiast in the UK or just discovering the world of RC hobbies, this servo combines precision engineering with a ultra-compact form factor that makes installation straightforward even in the most space-constrained builds.

Built by Radient, a trusted manufacturer in the RC hobby sector, the RS-SM118-PG represents excellent value for money at just £6.18. Weighing only 6 grams, this sub-micro servo delivers impressive torque and speed specifications that punch well above its diminutive size. The servo operates across a voltage range of 4.8V to 6.0V, making it compatible with standard RC battery configurations that dominate the UK RC market. Whether you're setting up a ready-to-run RC car, a competition-grade racer, or a custom build, this servo provides the control precision and reliability you need without adding unnecessary weight or bulk to your model.

The compact dimensions of just 22 x 12 x 23mm (measuring 0.85 x 0.46 x 0.89 inches) make this servo perfect for applications where space is at a premium. From small-scale RC buggies and trucks to micro helicopters and fixed-wing aircraft, the RS-SM118-PG delivers consistent, reliable servo actuation. As an analog servo, it offers straightforward integration with standard RC receivers and control systems, making it accessible to builders of all experience levels. The 14+ age recommendation reflects its use in hobby-grade RC models and indicates this is a product designed for serious hobbyists and enthusiasts rather than toy-grade equipment.

Key Features

• Sub-Micro Form Factor — At just 22mm in length, 12mm in width, and 23mm in height, this servo occupies minimal space in your RC model, allowing you to fit it into compact compartments and tight mounting locations where full-sized servos simply will not fit.
• Ultra-Lightweight Construction — Weighing only 6 grams, the RS-SM118-PG adds virtually no weight to your RC model, which is critical for maintaining optimal power-to-weight ratios and ensuring your vehicle performs at its best, especially in smaller-scale applications.
• Impressive Torque Output — Delivering 1.2kg-cm of torque at 6.0V, this servo provides sufficient pulling power to actuate control surfaces and moving parts reliably, even under load, ensuring responsive and precise control of your RC model.
• Fast Response Time — With a speed rating of 0.10 seconds per 60 degrees at 6.0V (and 0.12 seconds per 60 degrees at 4.8V), the RS-SM118-PG responds quickly to control inputs, delivering snappy handling characteristics and immediate feedback from your RC transmitter.
• Dual Voltage Compatibility — This servo operates across both 4.8V and 6.0V power supplies, giving you flexibility in your power system design and compatibility with most standard RC battery packs commonly used in the UK RC hobby community.
• Analog Servo Technology — As an analog servo, the RS-SM118-PG integrates seamlessly with standard RC receivers and control systems without requiring special programming or digital interfaces, making setup straightforward and maintenance simple.
• Proven Reliability — Built by Radient with quality engineering standards, this servo delivers dependable operation through hundreds of charge cycles, making it suitable for regular hobby use and competitive RC activities.

Technical Performance

The Radient RS-SM118-PG represents a carefully engineered balance between size, weight, and performance. At the heart of this servo is precision-crafted gearing and a reliable motor that delivers consistent torque across its operating voltage range. The servo's construction prioritises durability whilst maintaining the ultra-compact dimensions that make it suitable for tight installations. At 4.8V, the servo delivers 1.0kg-cm of torque with a response time of 0.12 seconds per 60 degrees, whilst increasing the voltage to 6.0V boosts performance to 1.2kg-cm of torque and accelerates the response time to 0.10 seconds per 60 degrees. This voltage flexibility is particularly valuable in UK RC setups, where battery pack configurations often allow for optional voltage increases during upgrades. The servo's compact 21.5 x 11.8 x 22.7mm dimensions (measured from the manufacturer specifications) and 6-gram weight make it ideally suited for sub-micro RC applications including small-scale buggies, touring cars, micro helicopter tail rotor control, and fixed-wing aircraft aileron and elevator actuation. The analog design ensures straightforward integration with any standard RC receiver, and the proven durability of Radient's servo architecture means you can expect reliable performance through seasons of regular use.

What's in the Box

• Radient RS-SM118-PG Sub-Micro 6g Analog Servo (RDNA0407)

Frequently Asked Questions

• Is the Radient RS-SM118-PG suitable for beginners in the UK RC hobby? — Yes, absolutely. This servo is designed for straightforward integration with standard RC receivers and control systems. As an analog servo, it requires no special programming or complex setup, making it accessible to hobbyists of all experience levels. The 14+ age recommendation reflects its use in serious hobby-grade models rather than toy equipment, but experienced builders at any skill level will appreciate its compact size and reliable performance.
• What battery voltage does this servo require? — The RS-SM118-PG operates across a voltage range of 4.8V to 6.0V. In practical terms, this means it works with standard 4-cell (4.8V nominal) NiMH battery packs or 2-cell (7.4V nominal) LiPo batteries when regulated through a BEC (Battery Elimination Circuit). Most UK RC hobby setups use either of these configurations, so compatibility is straightforward. At 6.0V, the servo delivers its best performance with faster response times and increased torque output.
• Where should I use the Radient RS-SM118-PG in my RC model? — Due to its sub-micro size and lightweight construction, this servo is ideal for aileron control on small fixed-wing aircraft, tail rotor control on micro helicopters, steering in compact 1/18-scale buggies, and throttle management in ultra-light RC applications. The 1.2kg-cm of torque (at 6.0V) is sufficient for most control surface actuation in small-scale models, though it would be underpowered for large aircraft or vehicles requiring heavy steering inputs.
• How does the Radient RS-SM118-PG compare to other sub-micro servos? — The RS-SM118-PG offers an excellent combination of compact dimensions (22 x 12 x 23mm), ultra-light weight (6 grams), and competitive torque output (1.2kg-cm at 6.0V). The fast response time of 0.10 seconds per 60 degrees ensures snappy control inputs, and the dual voltage compatibility (4.8V/6.0V) provides flexibility in power system design. For UK hobbyists building compact RC models, this servo delivers reliable performance at an exceptionally attractive price point of just £6.18.
• Is this an analog or digital servo, and what does that mean for my build? — The RS-SM118-PG is an analog servo, which means it uses traditional control signal processing rather than digital circuit boards. This simplifies installation because it works immediately with any standard RC receiver without programming or special calibration. Analog servos are generally more forgiving of voltage fluctuations and electrical noise, making them reliable choices for hobby builds. The trade-off is that digital servos often offer programmable features and slightly higher holding torque, but for most UK RC applications, the straightforward reliability of analog technology is perfectly adequate.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Radient RS-SM118-PG Sub-Micro 6g Analog Servo 1.2kg 0.10s 4.8 - 6.0V RDNA0407 today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.