The 6001 Decoder Bearing from MTWB is a 12×28×8mm is a miniature deep groove ball bearing widely used in compact rotary encoder and decoder assemblies. Its small cross-section, low friction torque, and smooth running characteristics make it suitable for optical and magnetic encoders where shaft drag and rotational accuracy directly affect signal quality. The 6001 is one of the smallest standard metric bearings commonly specified in decoder and sensor applications.
MTWB 6001 Decoder Bearing delivers the dimensional precision, electrical isolation, and signal-integrity protection required by modern encoder systems, all at China-cost pricing and quality control standards.
| Parameter | Value |
|---|---|
| Bearing Type | Deep Groove Ball Bearing (Miniature) |
| Bore Diameter (d) | 12 mm |
| Outer Diameter (D) | 28 mm |
| Width (B) | 8 mm |
| Chamfer (r min) | 0.3 mm |
| Dynamic Load Rating (Cr) | ~5.9 kN |
| Static Load Rating (C0r) | ~2.37 kN |
| Fatigue Load Limit (Cur) | ~164 N |
| Limiting Speed (Oil) | ~42,500 rpm |
| Limiting Speed (Grease) | ~24,900–32,000 rpm (depends on seal type) |
| Weight (approx.) | 0.019–0.022 kg |
Miniature thin-section construction — minimal radial and axial footprint, ideal for compact decoder housings.
Low starting torque — reduces drag on the encoder shaft, improving low-speed signal stability.
Precision raceway geometry — ensures smooth rotation and minimal runout for accurate pulse generation.
Available variants:
6001 — Open type (no seals), highest speed capability
6001-Z / 6001-2Z — Metal shield, dust protection, non-contact
6001-2RS / 6001-2HRS — Rubber contact seal, enhanced contamination resistance
6001N — With snap ring groove on outer ring for axial location
Operating Temperature: -30°C to +120°C (open/shielded types); -20°C to +100°C (sealed types)
Lubrication: Pre-lubricated with low-noise grease for shielded/sealed variants; oil lubrication recommended for open type at high speed
Mounting: Suitable for press-fit or light interference fit on shaft (da min. 14 mm) and housing (Da max. 26 mm)
ISO/DIN: 6001
Common cross-reference: 6001, 6001ZZ, 6001-2RS, 6001N, 6001NP6
Brand equivalents: NSK 6001, NTN 6001, SKF 6001, FAG 6001, KOYO 6001
When selecting a 6001 bearing for decoder use, consider:
Seal type — Open or ZZ for clean environments and higher speed; 2RS/2HRS for dusty or humid conditions (but lower limiting speed).
Radial clearance — C0 (normal) for standard fit; C3 for slight thermal expansion compensation.
Precision grade — P6 or better recommended for low runout in high-resolution decoders.
Lubrication — Low-noise grease (e.g., GA14 or equivalent) for smooth, quiet operation.
Axial location — 6001N with snap ring groove for simplified housing retention.
1. Decoder-Specific Electrical Isolation
The 6001 Decoder Bearing is designed to function within encoder-bearing assemblies where electrical signal integrity is paramount. MTWB applies specialized surface treatments and material selections to minimize electromagnetic interference (EMI) between the bearing structure and the sensor/decoder unit, supporting reliable speed and direction signal output in applications such as SKF BMD-class motor decoder units.
2. Signal-Protected Mechanical Rotation
Unlike standard bearings, decoder bearings must not introduce rotational noise that corrupts encoder signals. MTWB controls raceway roundness, ball grade, and surface finish to a level that ensures the bearing contributes minimal vibration and torque ripple — preserving the accuracy of the encoder's pulse output.
3. Precision for Encoder Integration
Encoder-bearing units require dimensional tolerance control far tighter than general-purpose bearings. MTWB maintains P6 or better precision with optional higher grades on request, ensuring proper fit within decoder housings and consistent air-gap control between encoder components.
4. Customization-Ready Architecture
MTWB decoder bearing supports:
●Non-standard bore/OD/width combinations for proprietary encoder designs
●Integrated flanged or grooved configurations for axial positioning
●Special coatings for electrical insulation or corrosion resistance
●Custom lubrication for extended maintenance-free operation
5. Application-Specific Material Options
Beyond standard GCr15 chrome steel, MTWB offers martensitic stainless steel (SV30 / X30CrMoN15-1), ceramic hybrid configurations, and alloy steels for demanding environments including EV motor compartments, aerospace actuators, and medical devices.
Application
Primary Application: Encoder & Decoder Bearing Units
Servo motor encoders — speed and position feedback
EV drive motor decoder units — rotor speed detection for inverter control
Industrial automation rotary encoders — conveyor, robotic arm, and CNC feedback
Material handling equipment — speed sensing for sorters and conveyors
Agricultural and forestry machinery — rotational speed monitoring in harsh environments
Wind turbine pitch systems — encoder bearings for blade angle feedback
Secondary Applications
Data-logging rotational sensors — the 6001DDC3G81 designation confirms infrared encoder/decoder IC compatibility
Medical motion control — precision encoder bearings for surgical robotics and imaging equipment
Aerospace actuators — speed and direction detection in flight control surfaces
Rail transport — axle-end speed sensors and traction motor feedback
1. Application-Specific Engineering, Not Catalog Re-branding
MTWB's decoder bearing platform is developed through direct engagement with OEM encoder manufacturers. The company's engineering team studies the customer's encoder architecture, signal frequency, and mechanical interface before recommending a bearing configuration — a process described in MTWB's customized bearing methodology.
2. Quality Control + China Manufacturing Efficiency
MTWB operates as a Hong Kong-registered company with five partner factories in mainland China, each equipped with advanced production lines, automatic inspection systems, and full testing equipment. All bearings are manufactured to ISO 9001 / ABEC / P6 or higher grades. This structure allows MTWB to offer international-brand-comparable precision at China-cost pricing.
3. 30+ Years of Customized Bearing Experience
MTWB's cumulative experience spans aviation, automotive, medical, metallurgy, rail transport, industrial pumps, escalators, agricultural machinery, robotic arms, and production-line equipment. This cross-industry exposure informs the decoder bearing design with lessons from applications where signal reliability is mission-critical.
4. 51 Active Patents, 10 Product Innovations
MTWB holds 51 active patents, including 10 product innovation patents. The company's engineering approach to decoder bearings draws on this IP portfolio, particularly in the areas of surface treatment, cage design, and material selection for low-interference rotation.
5. Short-Lead-Time Customization
MTWB customization service offers very short lead times from design through technical drawing, customer confirmation, sample making, to small-batch order production — a capability MTWB describes as "unparalleled by international brands".
6. OEM/ODM Partnership Model
MTWB functions as an OEM bearing partner for international brands, offering complete technical support from sample design to mass production. The company also supports small-batch prototype orders, making it accessible for encoder manufacturers in the R&D phase.
A 6001 decoder bearing is a compact deep groove ball bearing designed for encoder, decoder and other precision rotating applications.
A standard 6001 bearing has a 12 mm bore, 28 mm outside diameter and 8 mm width.
6001 decoder bearings can be used in encoder systems, motion control equipment, servo mechanisms and other compact rotating applications.
Yes. The bearing configuration can be customized according to application requirements by MTWB, including sealing, lubrication, precision and noise-performance requirements.
October 14,2026
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