MTWB 609 Decoder Bearing
The MTWB 609 Decoder Bearing is a purpose-engineered miniature deep groove ball bearing (DGBB) designed for rotary encoder, speed sensor, and motion feedback applications. Unlike a standard 609 bearing, this decoder-grade variant incorporates MTWB's proprietary raceway geometry optimization and precision grinding protocols to deliver stable rotational signal output at both low and high speeds. Manufactured by Mighty Way Industrial Limited (MTWB), a Hong Kong–based bearing supplier with over a decade of OEM service to American and European industrial clients, the 609 Decoder Bearing is built to ISO 9001 standards and available in ABEC/P6 precision grades or higher.
Parameter Value
Bearing Designation: MTWB 609 Decoder Bearing
Bore Diameter (d): 9 mm
Outer Diameter (D): 24 mm
Width (B): 7 mm
Bearing Type: Single-row deep groove ball bearing
Closure Options: ZZ (metal shield) / 2RS (rubber seal) / Open
Precision Grade: ABEC 3 / P6 or higher
Dynamic Load Rating (Cr): 3.33 kN
Static Load Rating (Cor): 1.41 kN
Limiting Speed (Grease): 30,000–34,000 rpm
Noise Grade: EMQ Z2/Z3 (Z4 available on request)
Radial Clearance: C0 / C3 (customizable)
Cage Material: Steel / Nylon (application-dependent)
Weight (approx.): 14–16 g
Lubrication: Lithium grease / Low-torque synthetic (custom)
Specifications are typical values. MTWB offers full customization on clearance, cage, lubrication, and shielding to match specific decoder signal requirements.
Decoder-Optimized Raceway Geometry. MTWB applies precision grinding and optimized raceway profiling to ensure consistent ball-to-raceway contact throughout rotation. This minimizes torque fluctuation, which is critical for maintaining clean signal output in magnetic encoder applications.
Sensor-Integrated Compatibility. Designed to pair with multi-pole magnetic encoder rings and sensor units, the 609 Decoder Bearing supports stable speed and direction detection at speeds as low as single-digit RPM without signal dropout.
Low Vibration, Low Noise Construction. Each bearing undergoes 100% noise testing. Standard EMQ Z2/Z3 grades are supplied, with Z4 ultra-quiet grades available for noise-sensitive encoder applications. Surface finish of raceways and balls, ring roundness, and cage design are all tightly controlled to achieve this.
Corrosion-Resistant Bearing Steel. Manufactured from high-carbon chromium bearing steel (GCr15 / 52100 equivalent) with optional ceramic ball upgrade for extended service life in humid or chemically exposed environments.
Custom OEM Capability. MTWB designs decoder bearings using ceramic ball options, advanced lubrication systems, and specialized sealing configurations to ensure reliable performance at high rotational speeds.
●Rotary encoder and resolver assemblies
●Electric motor speed and position feedback systems
●Servo motor and stepper motor control
●Automotive wheel speed sensor modules
●Medical device motion control (infusion pumps, diagnostic equipment)
●Industrial automation and robotics joint feedback
●HVAC damper actuators and valve position sensors
vs. Power Hand Tool Bearing
Power hand tool bearings (e.g., those used in drills, grinders, and impact drivers) are optimized for intermittent high-load, high-shock operation. They typically prioritize load capacity and impact resistance over signal stability. A power tool bearing may use thicker rings, higher clearance, and heavy-duty cages that are not compatible with the tight tolerances required for encoder signal integrity. In contrast, the MTWB 609 Decoder Bearing is engineered for continuous rotational signal accuracy, with tighter internal clearance control and finer surface finish to minimize non-repetitive runout (NRRO) that would otherwise introduce signal jitter.
vs. Low Noise EMQ Bearing
EMQ (Electric Motor Quality) bearings are defined primarily by their noise and vibration performance — they must operate at extremely low noise levels with minimal vibration. While the 609 Decoder Bearing also meets EMQ noise standards (Z2/Z3), its design focus extends beyond acoustic performance. Decoder bearings must additionally maintain magnetic signal consistency, which depends on factors EMQ ratings do not address: precise radial clearance stability under thermal cycling, non-magnetic contamination control, and raceway geometry that produces uniform rotational impedance. In short, every decoder bearing is an EMQ-grade bearing, but not every EMQ bearing is decoder-ready.
Integrated Sensor System Design. MTWB engineers decoder bearings as part of a complete sensor system, not as a standalone commodity component. The company's design approach integrates bearing geometry, clearance selection, lubrication, and sealing into the encoder's overall signal chain — ensuring that the bearing's rotational characteristics actively support, rather than compromise, sensor accuracy.
Bearing Life Prediction Technology. MTWB has developed proprietary life prediction methodology for miniature and small DGBB products, enabling OEM customers to receive application-specific service life projections based on actual load, speed, and thermal conditions.
Customized Manufacturing for OEM Programs. Since 2015, MTWB has specialized in micro-size, low-noise ball bearings and flanged thin-section bearings, with a dedicated custom bearing service platform (www.mtwb-customized-bearing.com) that simplifies global OEM sourcing.
Full Traceability and Dual Sealing Structure. MTWB offers patented dual sealing structures that improve sealing performance for decoder bearings operating in contaminated or high-humidity environments, with full material traceability from steel lot to finished product.
Supply & Ordering Information
Item Details
Brand MTWB® (Mighty Way Industrial Limited)
Minimum Order Negotiable (prototype quantities available)
Lead Time 15–30 days (standard); 7–10 days (stock items)
Packaging Industrial bulk / Individual blister / Custom branded
Shipping Port Shanghai / Ningbo / Shenzhen
Payment Terms T/T, L/C, PayPal (sample orders)
Certifications ISO 9001:2015; RoHS / REACH compliant
OEM Service Custom marking, packaging, and specification sheets available
Contact for Quotation: Submit your specification requirements (bore size, clearance, noise grade, quantity, and application environment) for a same-business-day response.
