RHJC is an ISO9001, CE, and RoHS certified manufacturer with over 20 years of expertise engineering high-precision jewelry micromotors. Engineered for professional goldsmiths, jewelry manufacturers, and high-volume finishing workshops, our equipment delivers low concentricity runout, exceptional torque stability, and whisper-quiet operation during delicate stone setting, intricate engraving, and heavy-duty precious metal polishing.
Our factory wholesale catalog features our flagship innovative series, including the newly released PRIME SENSE A9 equipped with wireless Bluetooth pedal control and ultra-high low-speed torque starting at 500 RPM. Designed for maintenance-free, continuous daily production in professional workshops, our brushless systems deliver up to 60,000 RPM and 9.2 N.cm torque without overheating or stalling under heavy load. We support low initial MOQs, custom OEM/ODM housing branding, and direct factory technical support to secure global distribution networks.
Note: The table below displays the key specifications of our core high-torque brushless series. Please browse the product list above and click on any product card to view full details, or contact our sales team to request our complete PDF product catalog.
| Model | Max. Speed | Output Power | Max. Torque | Foot Pedal Control | Collet Size | Primary Jewelry Advantage & Application |
| PRIME SENSE A9 (New) | 55,000 RPM | 240W | 8.5 N.cm | Wireless Bluetooth | 2.35 mm | Low-speed high torque (from 500 RPM) for delicate stone setting |
| Prime 926 | 60,000 RPM | 250W | 9.2 N.cm | Standard Wired | 2.35 mm | Top-tier power & torque for heavy gold, silver & alloy polishing |
| SENSE A7 | 55,000 RPM | 240W | 8.5 N.cm | Standard Wired | 2.35 mm | Heavy-duty 8.5 N.cm stability for continuous industrial production |
| Prime SENSE A6 55K | 55,000 RPM | 230W | 8.0 N.cm | Standard Wired | 2.35 mm | 3-speed adjustment mode tailored for versatile micro-engraving |
| Prime 407 | 50,000 RPM | 230W | 8.0 N.cm | Standard Wired | 2.35 mm | Compact 3.98kg unit for precise detail carving & benchtop work |
Q1: What makes the new PRIME SENSE A9 ideal for precision jewelry engraving and stone setting?
A: The PRIME SENSE A9 features a 240W brushless motor delivering ultra-high torque even at low speeds (starting at 500 RPM), preventing burs from stalling or jumping during delicate gem setting. It also introduces wireless Bluetooth foot pedal control to eliminate cable clutter on goldsmith workbenches.
Q2: What are the main advantages of brushless jewelry micromotors over traditional carbon brush units?
A: Brushless systems (such as our PRIME SENSE A9, SENSE A7, and Prime 926) offer a 2,000+ hour lifespan with zero carbon brush replacements, higher torque output (up to 9.2 N.cm), and low vibration for fatigue-free long working hours during intricate handwork.
Q3: Do you provide custom OEM branding and wholesale pricing for the SENSE A9 and other brushless lines?
A: Absolutely. As a direct manufacturer, RHJC offers tier-based volume discounts, custom logo labeling, custom housing colors, and responsive technical service backed by a 1-year factory warranty.
Contact the RHJC sales engineering team today to request a factory-direct price list, complete OEM/ODM consultation, or product catalog.
