NTN NK6/12 T2 Needle Roller Bearing 6x12x12 mm

Machined-Ring NK6/12 T2 NTN - Single-Row Needle Bearing (Open)

The NTN NK6/12 T2 is a needle roller bearing of machined-ring type, lacking an inner ring, with dimensions 6 mm inner diameter x 12 mm outer diameter x 12 mm width (6x12x12 mm). It is designed to deliver high radial load capacity in compact spaces, where conventional bearings may not fit.

Key Technical Details & Features

• Type: Machined-ring needle roller bearing (no inner ring)

• Dimensions: 6 x 12 x 12 mm (d x D x B)

• Cage: Polyamide (resin) cage (suffix T2)

• Load Ratings:
   • Dynamic load rating (Cr): ~3.4 kN
   • Static load rating (C0r): ~3.15 kN

• Speed limits (lubricated):
   • Grease lubrication limit: ~25,000 rpm
   • Oil lubrication limit: ~37,000 rpm

• Operating temperature range: -20 °C to +100 °C typical

• Typical shaft & housing fillet max radius: r ≤ 0.15 mm

• Design advantage: Because the bearing has no inner ring, the shaft itself acts as the raceway, saving space and reducing parts count.

Applications

This bearing is ideal in compact mechanical assemblies, gear trains, automotive transmissions, pump shafts, robotics, and where radial space is limited but load demands are high.

Advantages

• High radial load capacity for its compact size

• Minimal radial height due to the lack of inner ring

• Machined outer ring ensures precision and rigidity

• The polyamide cage (T2) is lightweight and helps maintain low friction

• Good rotational speed capabilities under proper lubrication

The description includes key search phrases like “NK6/12 T2 NTN”, “needle roller bearing 6x12x12”, “machined-ring needle bearing”, “compact high load bearing”, “open needle bearing”, “NTN needle bearing series”.

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FAQ (Frequently Asked Questions)

1. What does “machined-ring” mean in this bearing?
It indicates the outer ring is made from a solid steel ring that is machined and ground for precise dimensions, rather than stamped. This gives greater stiffness, precision, and load capacity.

2. Does this bearing have an inner ring?
No — the NK6/12 T2 is designed without an inner ring. The shaft itself acts as the inner raceway.

3. What is the “T2” suffix?
“T2” indicates a polyamide (resin) cage, which is lighter and helps maintain lower friction at high speeds.

4. What are typical load limits?
Dynamic load rating approx. 3.4 kN; static ~3.15 kN. Suitable for moderate radial loads.

5. Up to what speed can it operate?
Grease lubrication up to ~25,000 rpm; oil lubrication up to ~37,000 rpm under good conditions.

6. Where is this bearing used?
Compact machinery, transmissions, pump shafts, robotics, mechanical linkages — anywhere space is limited but load is significant.