NKE 6320 ZZ C3 100x215x47 mm - Single Row Deep Groove Ball Bearing

Characteristics of NKE 6320 ZZ C3

The NKE 6320 ZZ C3 is a single row deep groove ball bearing with double metal shields and increased radial internal clearance.

Its construction is suitable for bearing arrangements requiring radial load support combined with the ability to accommodate axial forces in both directions.

The 63 series belongs to the deep groove ball bearing family and is commonly used in appropriately designed rotating machinery.

Key construction features:

• Single row design - one row of balls operating between the inner and outer ring raceways.

• Bearing series 63 - deep groove ball bearing dimensional series.

• Dimensions 100x215x47 mm - 100 mm bore, 215 mm outside diameter and 47 mm width.

• ZZ metal shields - non-contact metal shields on both sides of the bearing.

• C3 radial internal clearance - greater than normal clearance CN.

• Radial load capacity - primarily designed to accommodate radial loads.

• Bidirectional axial load capability - can support axial forces in both directions within the bearing's operating limits.

• Non-separable construction - the inner ring, outer ring and rolling elements form a complete bearing assembly.

Technical Specifications

What Does NKE 6320 ZZ C3 Mean?

The designation consists of the basic bearing number 6320 and two technically important suffixes, ZZ and C3.

6320 - Basic bearing designation

63 - Bearing series

The 63 series identifies a dimensional series of single row deep groove ball bearings.

These bearings are designed primarily for radial loads while also accommodating axial loads in both directions.

20 - Bore code

For standard bearing bore codes of 04 and above, the code multiplied by 5 gives the nominal bore diameter in millimetres.

Therefore, bore code 20 corresponds to an inner diameter of 100 mm.

ZZ - Double metal shields

ZZ indicates metal shields installed on both sides of the bearing.

The shields help limit the entry of contaminants and reduce the escape of lubricant from the bearing interior.

Unlike contacting rubber seals, metal shields generally operate without direct rubbing contact against the inner ring.

This construction helps minimise additional friction associated with sealing contact.

However, metal shields do not provide complete protection against water, fine particles or aggressive contamination.

C3 - Increased radial internal clearance

C3 identifies radial internal clearance greater than the normal CN clearance range.

This clearance class may be required when operating conditions reduce the effective internal clearance due to interference fits, thermal expansion or temperature differences between the bearing rings.

C3 does not indicate higher manufacturing precision, increased load rating or automatically higher permissible rotational speed.

Construction and Operating Principle

The NKE 6320 ZZ C3 consists of an inner ring, an outer ring, one row of balls, a cage and two metal shields.

Inner ring

The inner ring has a nominal bore diameter of 100 mm and is designed to fit onto a correctly dimensioned shaft.

Its deep groove raceway provides the rolling contact surface for the balls.

Outer ring

The outer ring has a nominal outside diameter of 215 mm and is installed in a suitable housing bore.

The outer raceway transfers loads from the rolling elements to the supporting housing.

Rolling elements

A single row of balls operates between the deep groove raceways of the inner and outer rings.

The geometry enables the bearing to accommodate radial loads and axial loads acting in either direction.

Permissible axial loads depend on the bearing's internal geometry, lubrication, operating speed and other application conditions.

Metal shields

The ZZ design incorporates metal shields on both sides of the bearing.

These shields provide additional protection for the internal rolling contact surfaces and help retain lubricant.

They should not be considered equivalent to contacting elastomer seals in applications involving significant moisture or contamination.

C3 internal clearance

The increased radial internal clearance allows for a greater initial clearance range before installation.

During operation, interference fits and temperature differences can reduce the effective clearance.

Correct selection of C3 clearance must be based on the complete bearing arrangement rather than assuming that increased clearance is always beneficial.

NKE 6320 ZZ C3 Compared with Other Variants

ZZ vs 2RS

ZZ identifies metal shields, while 2RS generally identifies elastomer sealing elements on both sides.

The two constructions may differ in friction, sealing performance, permissible speed and maintenance requirements.

C3 vs CN

CN refers to normal radial internal clearance, while C3 represents a greater clearance range.

These variants should not be substituted without checking shaft and housing fits, temperature differences and required operating clearance.

Bearing Selection and Interchangeability

Before purchasing or replacing NKE 6320 ZZ C3, verify the technical requirements of the bearing arrangement.

Important selection criteria include:

1. Full bearing designation 6320 ZZ C3.

2. Manufacturer-specific designation and construction.

3. Nominal dimensions 100x215x47 mm.

4. Metal shields on both sides.

5. C3 radial internal clearance.

6. Cage design and material.

7. Radial and axial operating loads.

8. Rotational speed.

9. Operating temperature.

10. Lubrication conditions.

11. Shaft and housing fits.

12. Required bearing precision and installation conditions.

Bearings from different manufacturers with identical nominal dimensions are not necessarily fully interchangeable.

Differences in internal clearance, shield design, cage construction, load ratings and permissible operating conditions must be considered.

Typical Applications of 63 Series Deep Groove Ball Bearings

Single row deep groove ball bearings from the 63 series are used in appropriately designed rotating machinery where radial load support and bidirectional axial load capability are required.

Double metal shields may be suitable where additional protection of the bearing interior is desirable.

C3 radial internal clearance may be required in arrangements where interference fits or thermal effects significantly reduce the operating clearance.

These are general application characteristics of this bearing construction and do not establish confirmed OEM applications for the exact NKE 6320 ZZ C3 designation.

Compatibility with a particular motor, gearbox, industrial machine or drive assembly must be verified independently.

Installation and Operating Recommendations

Before installation, inspect the shaft and housing bore for dimensional accuracy, cleanliness and surface damage.

Use appropriate mounting tools and follow the bearing manufacturer's fitting recommendations.

When mounting the bearing onto a shaft with an interference fit, apply the mounting force to the inner ring.

When pressing the bearing into a housing with an interference fit, apply the mounting force to the outer ring.

Never transmit mounting forces through the balls and raceways, as this can cause localised damage.

Avoid direct impacts on the metal shields and do not deform them during handling.

Where the bearing is supplied with factory-applied grease, follow the manufacturer's recommendations regarding lubrication and operating conditions.

Store unused bearings in clean, dry conditions, preferably in their original protective packaging.

Alternative Designations and Search References

The following identification formats may be encountered:

• NKE 6320 ZZ C3

• 6320 ZZ C3 NKE

• NKE 6320-ZZ-C3

• NKE 6320 2Z C3

• NKE 6320-2Z-C3

• 6320ZZC3 NKE

• NKE deep groove ball bearing 6320 ZZ C3

ZZ and 2Z are commonly used in the bearing industry to describe double metal shields. However, exact equivalence of manufacturer-specific designations should be confirmed before treating them as interchangeable catalog references.

These identification formats are not independently verified OEM cross-reference numbers.

FAQ - NKE 6320 ZZ C3

1. What are the dimensions of NKE 6320 ZZ C3?

The bearing has a 100 mm inner diameter, 215 mm outer diameter and 47 mm width. Its complete nominal dimensions are 100x215x47 mm.

2. What does ZZ mean in NKE 6320 ZZ C3?

ZZ identifies metal shields on both sides of the bearing. These shields help protect the internal components from contamination and reduce lubricant escape.

3. What does C3 mean?

C3 indicates radial internal clearance greater than the normal CN clearance range. It may be required to compensate for clearance reduction caused by interference fits or thermal effects.

4. Does NKE 6320 ZZ C3 have rubber seals?

No. The ZZ designation identifies metal shields rather than contacting elastomer seals.

5. Can NKE 6320 ZZ C3 be replaced with 6320 C3?

Not automatically. The open 6320 C3 variant does not have integral metal shields, which changes the bearing's protection and lubrication requirements.

6. Are 6320 ZZ C3 and 6320 2RS C3 identical?

No. ZZ indicates metal shields, while 2RS generally refers to elastomer seals. Differences in friction, protection and operating limits must be considered.

7. Does C3 clearance increase the bearing's load rating?

No. C3 specifies the radial internal clearance class, not the dynamic or static load rating.

8. Can a bearing from another manufacturer replace NKE 6320 ZZ C3?

Potentially, but only after verifying dimensions, internal clearance, shield construction, cage design, load ratings and operating conditions. Matching dimensions alone do not establish full interchangeability.

NKE 6320 ZZ C3 - Key Technical Information

NKE 6320 ZZ C3 is a single row deep groove ball bearing measuring 100x215x47 mm. It belongs to the 63 series and features metal shields on both sides, identified by ZZ, and increased radial internal clearance C3. The bearing accommodates radial and bidirectional axial loads. Selection requires verification of lubrication, fits, operating temperature and application requirements.

NKE bearings are available through simmering.pl, a specialist supplier of rolling bearings, industrial seals and technical components.

With warehouse operations in Lublin, Poland, simmering.pl serves industrial customers, maintenance departments and international B2B buyers, with worldwide shipping options.