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R144ZZ Miniature Shielded Ball Bearing (3.175 x 6.35 x 2.779 mm)
- · Model / Bearing Designation: R144ZZ / R144-2Z
- · Bearing Type: Deep Groove Ball Bearing (Miniature Metric/Inch Series)
- · Bore Diameter (Inner Diameter): 3.175 mm / 0.125 in (1/8")
- · Outer Diameter (OD): 6.350 mm / 0.250 in (1/4")
- · Width / Thickness: 2.779 mm / 0.1094 in
- · Closure Type: Double Metal Shielded (ZZ / 2Z)
- · Material (Rings & Balls): Chrome Steel (GCr15 / AISI 52100) / Stainless Steel AISI 440C (Optional)
- · Cage Material: Stamping Steel / Stainless Steel
- · Precision Rating: ABEC-3 / ABEC-5 (P6 / P5)
- · Radial Internal Clearance: C0 (Standard) / C3
Product Overview
R144ZZ Precision Miniature Ball Bearing Overview
The R144ZZ (1/8″ x 1/4″ x 0.1094″) is an ultra-precision miniature deep groove ball bearing engineered for high performance in extremely compact spaces. Manufactured with premium Chrome Steel (GCr15) or optional Stainless Steel (AISI 440C), this bearing delivers exceptional durability, high rotational accuracy, and low running friction.
Equipped with double metal shields (designated as ZZ), the R144ZZ prevents the ingress of dust, dirt, and foreign particles while securely retaining factory-loaded high-speed lubricant. This sealed construction ensures smooth operation and significantly extends service life with zero required maintenance.
Key Advantages:
- Precision Machining: Manufactured to ABEC-3 / ABEC-5 tolerances, ensuring minimum radial runout and optimal rotational stability.
- Double Shield Protection: Metal shields on both sides protect critical internal components against contamination without adding rotational friction.
- High Speed Capability: Optimized cage design and polished raceways allow operating speeds up to 48,000 RPM.
- Versatile Application: Ideal for high-tech industries including medical devices, RC model craft, miniature motors, and robotics.
Customization & OEM Options:
We provide full custom engineering services for R144ZZ bearings, including custom internal clearance (C2, C3), specialized high-temperature greases, ceramic hybrid balls (Si3N4), and stainless steel material configurations. Contact our technical engineering team for bulk wholesale pricing and custom specifications.
Technical Specifications
| Model / Bearing Designation | R144ZZ / R144-2Z |
| Bearing Type | Deep Groove Ball Bearing (Miniature Metric/Inch Series) |
| Bore Diameter (Inner Diameter) | 3.175 mm / 0.125 in (1/8") |
| Outer Diameter (OD) | 6.350 mm / 0.250 in (1/4") |
| Width / Thickness | 2.779 mm / 0.1094 in |
| Closure Type | Double Metal Shielded (ZZ / 2Z) |
| Material (Rings & Balls) | Chrome Steel (GCr15 / AISI 52100) / Stainless Steel AISI 440C (Optional) |
| Cage Material | Stamping Steel / Stainless Steel |
| Precision Rating | ABEC-3 / ABEC-5 (P6 / P5) |
| Radial Internal Clearance | C0 (Standard) / C3 |
| Limiting Speed (Grease) | Up to 48,000 RPM |
| Operating Temperature Range | -30°C to +120°C |
Key Features
Applications
