Product Overview

The NMT 625-RZTN9/CNHVT105B is a single-row sealed precision deep groove ball bearing. With a 5 mm bore, 16 mm outer diameter, and 5 mm width, this bearing combines a single-side non-contact rubber seal (RZ) with a glass fibre reinforced polyamide 66 (PA66) cage (TN9) , integrating compact dimensions, low friction characteristics, high-speed capability, and precision rotational accuracy into a single package, accommodating radial and bidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 1.14 kN (256 lbf) , a static load rating of 0.38 kN (85 lbf) , and a fatigue load limit of 0.016 kN . It achieves a reference speed of 95,000 r/min and a limiting speed of 60,000 r/min . The bearing weighs only 0.005 kg (5 g)  with an operating temperature range of -30°C to 120°C . The tolerance class is P6 (ISO Class 6) , and the radial clearance is CNH – the upper half of the normal clearance range.

 

The RZ seal design is a key feature of this bearing – the single-side non-contact rubber seal effectively prevents contaminant ingress while adding no extra resistance or heat generation. The TN9 glass fibre reinforced PA66 cage provides excellent guidance accuracy and dimensional stability at high speeds. The CNH radial clearance (upper half of normal clearance) accommodates moderate loads and medium-to-high speed conditions. The compact 5×16×5 mm dimensions make it ideal for space-constrained applications. The synergy of low friction, high speed, compact design, and precision rotational accuracy makes this bearing the ideal precision bearing solution for miniature high-speed equipment.

 

Model Code Decoding – Understanding NMT 625-RZTN9/CNHVT105B

Code Meaning

625 Basic model – 5 mm bore, 16 mm OD, 5 mm width 

RZ Single-side non-contact rubber seal – steel plate washer with vulcanized rubber, low-friction design

TN9 Glass fibre reinforced polyamide 66 (PA66) injection moulded snap cage, ball centred

CNH Upper half of normal radial internal clearance range 

VT105 Grease designation – type unknown

B Grease fill quantity greater than standard 

Core Value: The RZ single-side non-contact seal effectively prevents contaminant ingress while adding no extra resistance or heat generation. The TN9 glass fibre reinforced PA66 cage provides excellent guidance accuracy and dimensional stability at high speeds. The CNH radial clearance (upper half of normal clearance) accommodates moderate loads and medium-to-high speed conditions. The P6 precision class ensures reliable rotational accuracy. The compact 5×16×5 mm dimensions of the 625 series make it ideal for space-constrained applications. The synergy of low friction, high speed, compact design, and precision rotational accuracy makes this bearing the ideal precision bearing solution for miniature high-speed equipment.

 

Core Performance Advantages

1. Single-Side Non-Contact Rubber Seal (RZ) – Low Friction, Effective Protection

The bearing features a single-side non-contact rubber seal (RZ) that effectively prevents dust and other contaminants from entering the bearing interior, while the non-contact design avoids friction between the seal and the inner ring – adding no extra resistance or heat generation. The bearing comes pre-filled with high-quality grease (VT105) from the factory – ready to install out of the box, no additional lubrication required.

 

2. Glass Fibre Reinforced PA66 Cage (TN9) – Speed and Durability Combined

The glass fibre reinforced polyamide 66 (PA66) injection moulded snap cage (TN9) features ball-centred guidance. This material offers an excellent strength-to-weight ratio and dimensional stability, providing superior guidance accuracy and low friction at high speeds, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 95,000 r/min reference speed.

 

3. CNH Radial Clearance – Optimised Internal Clearance

This bearing features CNH radial clearance – the upper half of the normal clearance range. This optimised internal clearance design accommodates moderate loads and medium-to-high speed conditions, ensuring stable temperature performance and running accuracy at high speeds.

 

4. Compact Precision Miniaturisation – 5×16×5 mm

With compact dimensions – 5 mm bore, 16 mm outer diameter, and 5 mm width – this bearing can be easily integrated into space-constrained precision equipment. Weighing only 5 g. The tolerance class is P6 (ISO Class 6) , with bore and OD tolerances of -0.008mm to 0, meeting the rotational accuracy requirements of precision equipment.

 

5. Deep Groove Design – Bidirectional Load Capacity, Excellent Versatility

Deep groove ball bearings feature a simple structure, wide versatility, and low friction. This bearing can accommodate radial loads and bidirectional axial loads simultaneously, providing excellent load capacity in miniaturised designs. With a dynamic load rating of 1.14 kN (256 lbf)  and static load rating of 0.38 kN (85 lbf) , it meets the load requirements of most miniature applications.

 

6. Wide Operating Temperature Range

This bearing operates within a temperature range of -30°C to 120°C, capable of adapting to various demanding environments from cold storage to high-temperature processing.

 

7. RoHS and REACH Compliant

This bearing is compliant with RoHS and REACH environmental standards, ensuring safe use even in regions with strict environmental regulations.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 5 mm 

Bore Tolerance -0.008mm to 0

Outer Diameter D 16 mm 

OD Tolerance -0.008mm to 0

Width B 5 mm 

Width Tolerance -0.12mm to 0

Inner Ring OD d₁ ≈ 8.4 mm 

Outer Ring ID D₂ ≈ 13.3 mm 

Chamfer r₁,₂ min. 0.3 mm 

Shaft da min. 7.4 mm 

Shaft da max. 8.3 mm 

Housing Da max. 13.6 mm 

Max Fillet Radius ra max. 0.3 mm 

Dynamic Load Rating C 1.14 kN (256 lbf)

Static Load Rating C₀ 0.38 kN (85 lbf)

Fatigue Load Limit Pu 0.016 kN 

Reference Speed 95,000 r/min 

Limiting Speed 60,000 r/min 

Seal Type Single-Side Non-Contact Rubber Seal (RZ)

Cage Material Glass Fibre Reinforced PA66 (TN9)

Tolerance Class P6 (ISO Class 6)

Radial Clearance CNH 

Lubrication Pre-filled Grease (VT105)

Weight 0.005 kg (5 g)

Temperature Range -30°C to 120°C

Typical Applications

The NMT 625-RZTN9/CNHVT105B, with its compact dimensions, low friction characteristics, high-speed capability, and precision rotational accuracy, covers an exceptionally wide range of high-end miniature applications:

 

Small Precision Motors – stepper motors, DC micromotors, servo motors

 

Precision Instruments – measuring devices, optical scanners, chromatography products

 

Medical Devices – dental handpieces, surgical tools, laboratory equipment

 

Optical Equipment – laser scanners, rotating mirrors, optical encoders

 

Semiconductor Manufacturing Equipment – precision wafer processing, chip packaging

 

Office Automation Equipment – printers, scanners

 

Household Appliances – washing machines, dryers, and other home appliances

 

Industrial Machinery – conveyors, pumps, compressors

 

Automotive Applications – transmissions, clutch systems

 

Important Installation Notes

✅ This bearing features a single-side non-contact rubber seal (RZ) and comes pre-filled with high-quality grease – ready to install out of the box, no additional lubrication required.

 

✅ Ensure shaft and housing fits comply with P6 grade requirements (bore 5 mm, OD 16 mm). Shaft abutment diameter: da min. 7.4 mm, da max. 8.3 mm; housing abutment diameter: Da max. 13.6 mm; maximum chamfer radius: ra max. 0.3 mm.

 

✅ This bearing features a single-side seal design – ensure the sealed side faces the direction with lower contaminant ingress risk during installation.

 

✅ Due to the compact size (only 5 g), use specialised miniature bearing installation tools and take extra care to avoid excessive force or impact.

 

✅ Installation in a clean environment is recommended to prevent contaminant ingress that could affect high-speed performance.

 

⚠️ This bearing has no preload setting – if paired configurations or specific preload are required, adjust based on application requirements.

 

⚠️ This bearing has no lubrication groove and no relubrication feature – the seal design is lubricated for life, requiring no relubrication.

 

⚠️ CNH radial clearance is the upper half of the normal clearance range, accommodating moderate loads and medium-to-high speed conditions – please confirm suitability for your specific application.

 

NMT Quality Commitment

Japan NMT (Enmutī) has deep expertise in the precision bearing industry, with breakthroughs in material purification, process refinement, scenario customisation, and intelligent upgrading, transforming precision bearings into core solutions addressing pain points across multiple industries. The NMT 625-RZTN9/CNHVT105B bearing is manufactured to strict Japanese quality standards – from ring material (high-purity bearing steel) and rolling elements to superfinishing processes. The combination of single-side non-contact seal (RZ), glass fibre reinforced PA66 cage (TN9), CNH radial clearance, P6 precision class, and compact miniature design makes this bearing the flagship precision bearing in the NMT miniature bearing series – offering the perfect balance of low friction, high speed, and precision performance.

 

Choose NMT 625-RZTN9/CNHVT105B for:

 

✅ Single-side non-contact seal – low friction, effective protection

 

✅ Glass fibre reinforced PA66 cage – speed and durability combined

 

✅ CNH radial clearance – optimised internal clearance

 

✅ Compact precision miniaturisation – 5×16×5 mm, only 5 g

 

✅ 95,000 r/min reference speed – industry-leading

 

✅ Deep groove design – bidirectional load capacity, low friction, low noise

 

✅ Wide temperature range – -30°C to 120°C

 

✅ RoHS and REACH compliant

 

✅ Factory pre-lubricated – ready to install

 

✅ Japanese precision manufacturing quality