- Manufacturer: ARRMA
- Part Number: Z-ARA310966
- ARRMA Part Number: ARA310966
- EAN: 5052127035101
- Part Type: Pinion Gear
- Number of Teeth: 19
- Gear Pitch: Mod1
- Bore Type: Safe-D5
- Motor Shaft Diameter: 5mm
- Material: Steel
- Set-Screw Specification: M4 x 4mm
- E-Clip Size: 3.2mm
- Tooth Profile: Wide precision manufactured
- Compatible Vehicle Scales: 1/5, 1/7, 1/8
- Compatible with ARRMA KRATON 8S 4X4 RTR (ARA110002)
- Compatible with ARRMA KRATON 8S EXB 4X4 Roller (ARA5208)
- Compatible with ARRMA KRATON 8S EXB AVC 4X4 RTR (ARA5808V2T1)
- Compatible with ARRMA OUTCAST 8S AVC 4X4 RTR (ARA5810)
- Compatible with ARRMA OUTCAST 8S EXB 4X4 Roller (ARA5210)
- Compatible with ARRMA OUTCAST 8S EXB AVC 4X4 RTR (ARA5810V2T1)
- Compatible with ARRMA BIG ROCK 6S 4X4 RTR (ARA7612)
- Compatible with ARRMA FELONY 6S AVC 4X4 RTR (ARA7617V2)
- Compatible with ARRMA FIRETEAM 6S 4X4 RTR (ARA7618)
- Compatible with ARRMA INFRACTION 6S AVC 4X4 RTR (ARA7615V2)
- Compatible with ARRMA LIMITLESS 6S 4X4 Roller (ARA7116V2)
- Compatible with ARRMA MOJAVE 6S 4X4 RTR (ARA7604V2)
- Compatible with ARRMA MOJAVE 6S EXB 4X4 Roller (ARA7204)
- Compatible with ARRMA KRATON 6S 4X4 Roller (ARA106053)
- Compatible with ARRMA KRATON 6S 4X4 RTR (ARA8608V5, ARA8608V6)
- Compatible with ARRMA KRATON 6S EXB 4X4 RTR (ARA8708V6, ARA8708T1)
- Compatible with ARRMA NOTORIOUS 6S 4X4 RTR (ARA8611V5, ARA8611V6)
- Compatible with ARRMA OUTCAST 6S EXB AVC 4X4 RTR (ARA8710)
- Compatible with ARRMA TALION 6S EXB AVC 4X4 RTR (ARA8707)
- Compatible with ARRMA TYPHON 6S 4X4 RTR (ARA8606V5)
- Compatible with ARRMA TYPHON 6S TLR Tuned 4X4 Roller (ARA8306)
- Compatible with ARRMA TYPHON 6S TLR Tuned 4X4 RTR (ARA8406)
- Included Accessories: Set screw and E-clip for motor shaft retention
- Designed for Brushless Motor Systems
Overview
The ARRMA Pinion Gear, 19T HD Mod1 Safe-D5 (Z-ARA310966) is an essential replacement part for RC enthusiasts running ARRMA brushless RC vehicles across multiple scales and platforms. Whether you're operating a 1/5 scale speed truck, 1/7 all-road street bash, or 1/8 scale buggy, this precision-engineered pinion gear is the perfect addition to your RC tool box. This tough steel component is manufactured to exacting standards to deliver reliable performance in extreme RC conditions, making it an indispensable spare for both casual weekend bashers and serious competitors who demand consistency from their RC cars and trucks.
The 19-tooth Mod1 pitch design makes this pinion gear compatible with a wide range of ARRMA models, including the popular KRATON 8S, OUTCAST 8S, BIG ROCK 6S, FELONY 6S, INFRACTION 6S, LIMITLESS 6S, MOJAVE 6S, TALION 6S, TYPHON 6S and NOTORIOUS 6S platforms. If you're looking for a high-quality replacement pinion for your brushless RC truck, buggy or stunt vehicle, this genuine ARRMA component is engineered to maintain the performance and reliability your RC deserves. This is the ideal spare to keep on hand for maintenance, upgrades or emergency replacements during intense RC racing or bashing sessions.
Available now at RC Model Shop, this pinion gear represents genuine ARRMA engineering backed by years of RC development and real-world testing. UK RC enthusiasts trust ARRMA for consistent, durable performance, and this 19T pinion is no exception—a true workhorse component for your RC collection.
Key Features
- Strong and durable steel construction — Manufactured from premium steel, this pinion gear delivers long-lasting performance even under the extreme stresses of high-power brushless RC systems, ensuring your drivetrain remains reliable through countless bashing sessions and competitive runs.
- Precision manufactured wide tooth profile — The wide tooth design is engineered for smooth, efficient power transfer and meshing with spur gears, reducing noise and wear whilst maintaining consistent acceleration and deceleration characteristics across varied terrain and driving conditions.
- Safe-D5 shaped bore design — The distinctive 'D' shaped hole matches your motor shaft profile precisely, which means drive and brakes are not lost even if the set-screw backs out during aggressive driving, providing peace of mind and preventing unexpected drivetrain failures mid-run.
- 5mm motor shaft compatibility — Designed to fit standard 5mm motor shafts commonly found across ARRMA's brushless RC range, ensuring seamless integration with your existing powerplant without requiring adapters or modifications.
- Precision manufactured threaded set-screw hole — The M4 x 4mm set-screw hole is precision-threaded to ensure secure, repeatable fastening and alignment with your motor shaft, maintaining critical gear mesh and drivetrain geometry.
- E-clip included for motor shaft retention — The supplied 3.2mm E-clip provides additional shaft retention security, offering a secondary fail-safe method to keep your pinion gear locked in place during high-stress driving scenarios.
- Mod1 pitch specification — The Mod1 gear pitch is a standard specification across ARRMA's transmission systems, ensuring compatibility with stock and upgraded spur gears across the entire ARRMA RC vehicle range.
Technical Performance
This 19-tooth pinion gear is engineered specifically for ARRMA's Mod1 transmission systems, which utilise precise gear pitch and tooth profile tolerances to deliver smooth, reliable power delivery in brushless RC vehicles ranging from 1/5 scale speed trucks to compact 1/8 scale buggies. The steel material composition provides superior durability compared to softer metals, resisting tooth wear and stripping even when paired with high-output brushless motors spinning at thousands of RPM. The precision manufacturing process ensures consistent tooth geometry, which is critical for maintaining proper mesh with your spur gear and preventing vibration, noise and efficiency losses that degrade RC performance. The Safe-D5 bore design is ARRMA's proprietary solution to a common problem in RC—when set-screws vibrate loose during intense driving, traditional round-bore pinions can slip on the motor shaft and cause complete loss of drive. The D-shaped profile physically locks the pinion to the shaft, meaning even if fastener tension is lost, your RC vehicle maintains traction and braking. This engineering detail alone has prevented countless on-track disasters and unexpected failures during RC events. The wide tooth profile promotes load distribution across a greater surface area, reducing stress concentrations that lead to premature failure and extending the service life of both pinion and spur gear. Whether you're running maximum-power 8S LiPo setups in a KRATON 8S or standard 6S configurations in lighter platforms, this 19T pinion provides the gear reduction and torque multiplication needed for controlled acceleration and smooth drivetrain operation.
What's in the Box
- 1 x 19T Mod1 Safe-D Pinion Gear in premium steel
- 1 x M4 x 4mm Set Screw for secure fastening to motor shaft
- 1 x 3.2mm E-Clip for additional motor shaft retention and security
Frequently Asked Questions
- Which ARRMA RC models is this 19T pinion gear compatible with? — This pinion gear is compatible with a comprehensive range of ARRMA platforms including the 1/5 KRATON 8S 4X4 RTR and EXB roller variants, 1/5 KRATON 8S EXB AVC, 1/5 OUTCAST 8S AVC RTR and EXB variants, 1/7 BIG ROCK 6S RTR, 1/7 FELONY 6S AVC RTR, 1/7 FIRETEAM 6S RTR, 1/7 INFRACTION 6S AVC RTR, 1/7 LIMITLESS 6S roller, 1/7 MOJAVE 6S RTR and EXB roller, 1/8 KRATON 6S RTR and EXB variants, 1/8 NOTORIOUS 6S RTR, 1/8 OUTCAST 6S EXB AVC RTR, 1/8 TALION 6S EXB AVC RTR, 1/8 TYPHON 6S RTR and TLR Tuned models. Always verify your specific model fitment on the ARRMA website or consult the product page before purchasing to ensure compatibility with your RC vehicle.
- What makes the Safe-D5 bore design different from standard pinions? — The Safe-D5 shaped bore features a distinctive 'D' shaped hole that physically matches your motor shaft profile, preventing slippage even if the set-screw vibrates loose during high-intensity driving. Traditional round-bore pinions rely entirely on fastener tension to lock the gear to the shaft—if vibration loosens the screw, the pinion can slip and your RC loses drive and braking completely. The D-shaped design is a mechanical fail-safe that prevents this common problem, making it an essential safety feature for serious RC enthusiasts.
- What set-screw and E-clip specifications are included? — The package includes one M4 x 4mm precision manufactured set-screw and one 3.2mm E-clip for motor shaft retention. These components work together to lock the pinion securely to your 5mm motor shaft, with the E-clip providing a secondary mechanical retention method that prevents complete loss of drive if fastener tension is compromised.
- Is this suitable for high-power brushless RC systems? — Yes, absolutely. This 19T pinion gear is engineered specifically for ARRMA's brushless RC vehicles, many of which utilise high-output brushless motors and high-capacity LiPo batteries. The premium steel construction and precision manufacturing deliver the durability and reliability needed to handle the extreme torque and RPM found in modern brushless speed trucks, buggies and stunt platforms. Whether you're running 6S or 8S LiPo configurations, this pinion is engineered for reliable performance.
- Why should I carry a spare pinion gear in my RC tool box? — Pinion gears are wear items that experience constant stress during RC operation. Carrying a spare ensures you're never stranded with a damaged or worn pinion during an event or bashing session. The 19T Mod1 Safe-D is compact, affordable and compatible with so many ARRMA platforms that having one on hand is simply smart RC maintenance. Unexpected gear damage happens, and being prepared means more track time and fewer missed opportunities to run your RC.
- What is Mod1 gear pitch and why does it matter? — Mod1 refers to the gear pitch standard—essentially the size and spacing of the teeth on the pinion and spur gear. ARRMA uses Mod1 as a standardised specification across most of their brushless RC range, meaning this 19T pinion will mesh correctly with the spur gears in compatible ARRMA transmissions. Mismatched gear pitches cause poor meshing, noise, vibration and premature wear, so always confirm you're using matching Mod1 components throughout your drivetrain.
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 ARRMA Pinion Gear, 19T HD Mod1 Safe-D5 Z-ARA310966 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.
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