ASNU 15 NAF 15x42x18 Freewheel Clutch

ASNU 15 NAF 15x42x18 mm - One-Way Freewheel Clutch

ASNU 15 NAF is a roller-type one-way freewheel clutch with dimensions of 15x42x18 mm. It is designed to transmit torque in one direction while allowing free rotation in the opposite direction. The ASNU design uses a ramp-and-roller locking mechanism and requires external bearing support. It is used in overrunning, indexing and backstopping mechanisms where controlled one-directional torque transmission is required.

Technical Specifications - ASNU 15 NAF

The dimensions identify the clutch's installation envelope. They do not establish full interchangeability with other ASNU 15 executions or conventional rolling bearings.

Reference Technical Data - ASNU 15 Design

Published technical catalogues for the ASNU 15 design provide the following reference values.

Technical clarification: These are reference specifications for the ASNU 15 design. They have not been independently confirmed for the exact NAF-branded product. The torque rating, speed limits and mounting details must be checked against NAF documentation before being presented as guaranteed product specifications.

What Does ASNU 15 Mean?

The designation identifies the clutch family and nominal bore size.

ASNU - Roller-Type Freewheel Clutch Series

ASNU refers to a family of one-way freewheel clutches based on a ramp-and-roller locking mechanism.

This construction is designed to transmit torque through the wedging action of rollers between the inner and outer races.

Unlike conventional ball or roller bearings, its primary function is directional torque transmission rather than shaft support.

15 - Nominal Bore Diameter

The number 15 identifies a nominal bore diameter of 15 mm.

The complete boundary dimensions are 15x42x18 mm.

NAF - Product Brand

NAF is the brand specified in the product reference.

The brand should be retained in the product title and identification data to distinguish the offered item from similarly designated freewheel clutches supplied by other manufacturers.

How Does the ASNU 15 One-Way Clutch Work?

The ASNU 15 uses a mechanical locking principle based on rollers and specially shaped ramp surfaces.

Its operation depends on the relative direction of rotation between the inner and outer races.

Locking Direction - Torque Transmission

When the races rotate relative to one another in the locking direction, the rollers move into a wedging position.

The resulting contact forces create a mechanical connection that allows torque to be transmitted between the races.

This process occurs automatically as a result of relative rotation.

Freewheeling Direction - Overrunning

When relative rotation occurs in the opposite direction, the rollers move out of the wedging condition.

The races can then rotate relative to each other without rigid torque transmission.

Although the clutch is disengaged in this direction, internal friction and drag may still be present.

Direction of Rotation

The locking direction depends on the clutch design, mounting orientation and which race is driving.

It must be checked before installation.

The clutch is not intended to provide freely selectable locking directions during operation.

ASNU 15 Clutch Construction

Inner Race

The inner race is designed to connect to the shaft.

Reference ASNU designs use a keyed shaft connection, with a nominal bore of 15 mm and an H7 bore tolerance.

The actual keyway dimensions and tolerances must be confirmed for the NAF execution.

Outer Race

The outer race transmits torque to the surrounding component.

Reference ASNU constructions use an outer race with an n6 tolerance and additional side slots for torque transmission.

The housing connection must be designed to accommodate the required torque without slipping or damaging the clutch.

Ramp-and-Roller Mechanism

The locking mechanism consists of rollers operating between the inner and outer race surfaces.

The rollers engage through a wedging action in the locking direction and disengage during overrunning.

Correct geometry, lubrication and alignment are essential for reliable operation.

External Bearing Support

ASNU 15 is not a self-supporting radial bearing.

The clutch requires separate bearings to support radial and axial loads and maintain the correct alignment of the shaft and surrounding components.

This is a critical distinction between an ASNU freewheel clutch and a conventional rolling bearing.

The clutch should not be used as the sole supporting element of a rotating shaft.

Three Main Functions of ASNU 15

1. Overrunning Clutch

An overrunning clutch transmits torque when the driving member rotates in the engagement direction.

If the driven member begins rotating faster than the driving member, the clutch can disengage automatically.

This allows the driven component to continue rotating without forcing the driving component to follow at the same speed.

Typical design situations include:

• Drive systems requiring automatic disengagement.

• Mechanisms with different rotational speeds.

• Assemblies requiring freewheeling after the driving input slows down.

Suitability depends on the clutch's torque rating, overrunning speed and operating conditions.

2. Indexing Clutch

An indexing clutch can convert reciprocating or oscillating input movement into intermittent rotation in one direction.

During the driving stroke, the clutch engages and transmits torque.

During the return stroke, the clutch overruns.

This operating principle is used in mechanical indexing and intermittent-feed systems.

Frequent engagement cycles require particular attention to loading, lubrication and clutch service life.

3. Backstopping Clutch

A backstopping clutch permits rotation in the intended direction while resisting reverse rotation.

This function may be used to prevent unwanted backward movement in appropriately designed machinery.

However, an ASNU 15 should not automatically be considered a certified safety device for lifting people, supporting suspended loads or other safety-critical applications.

Such applications require separate engineering assessment and appropriate safety provisions.

ASNU 15 vs 6302 Deep Groove Ball Bearing

ASNU 15 has the same nominal bore and outside diameter as a standard 6302 deep groove ball bearing.

However, the two components have fundamentally different functions.

ASNU 15 and 6302 are not interchangeable.

A conventional 6302 bearing allows rotation without providing the directional locking function of a freewheel clutch.

Conversely, an ASNU 15 cannot replace the radial load-supporting function of a 6302 bearing.

Some mechanical assemblies use both components to provide the required combination of shaft support and one-way torque transmission.

Alternative Designations and Search References

The product may appear in purchasing documentation under the following variations:

• ASNU 15 NAF

• NAF ASNU 15

• ASNU15 NAF

• ASNU 15

• ASNU 15 15x42x18

• ASNU 15 one-way clutch

• ASNU 15 freewheel clutch

The exact brand and complete designation should be checked before ordering.

ASNU 15 clutches from different manufacturers may share nominal dimensions but differ in torque capacity, tolerances, mounting features and permissible operating speeds.

ASNU 15 Selection and Interchangeability

Selecting a one-way clutch requires more than matching its dimensions.

Boundary Dimensions

Confirm:

• Bore diameter: 15 mm.

• Outside diameter: 42 mm.

• Width: 18 mm.

Torque Capacity

Determine the maximum torque transmitted during normal operation.

Consider peak loads, starting torque and dynamic loading.

The reference nominal torque of 30 Nm must not be assumed to be the confirmed rating of the NAF execution.

Locking Direction

Verify the required locking direction relative to the shaft and housing.

Incorrect installation can result in the clutch freewheeling when torque transmission is required.

Overrunning Speed

Check whether the inner race or outer race will overrun.

The permissible speeds may differ depending on which race rotates freely.

Mounting Arrangement

Verify the shaft fit, housing fit, keyway geometry and outer race torque-transmission features.

External Bearing Support

Ensure that suitable separate bearings support radial and axial loads.

Lubrication

Confirm the lubricant type and lubrication method specified by the manufacturer.

Operating Conditions

Consider temperature, contamination, engagement frequency and expected service life.

A dimensionally compatible replacement should only be approved after these operating requirements have been evaluated.

Installation and Mounting Requirements

Shaft Connection

The inner race must be correctly connected to the shaft.

Where a keyed connection is specified, verify the key and keyway dimensions before installation.

Outer Race Connection

The outer race must be secured using the mounting arrangement required by the clutch design.

Torque must be transmitted through the intended mechanical connection rather than relying on an unsuitable friction fit.

Bearing Support

Provide separate bearings to maintain shaft alignment and accommodate radial and axial forces.

Do not use the clutch as the only shaft-supporting component.

Lubrication

The ASNU design requires suitable lubrication and protection against contamination.

The lubricant and application method must follow the instructions for the exact clutch execution.

Functional Check

Before operating the machine, verify that the clutch:

• Locks in the required direction.

• Freewheels in the opposite direction.

• Rotates without abnormal resistance.

• Is correctly aligned with the shaft and housing.

The initial functional check should be carried out under controlled conditions.

Frequently Asked Questions - ASNU 15 NAF

What are the dimensions of ASNU 15 NAF?

ASNU 15 NAF has a 15 mm bore diameter, 42 mm outside diameter and 18 mm width. Its complete dimensions are 15x42x18 mm.

Is ASNU 15 a one-way bearing?

ASNU 15 is commonly described commercially as a one-way bearing. Technically, it is a one-way freewheel clutch designed to transmit torque in one direction while allowing overrunning in the opposite direction.

Does ASNU 15 require additional bearings?

Yes. The ASNU design requires separate bearings to support radial and axial loads and maintain the correct alignment of the rotating components.

How does the ASNU 15 locking mechanism work?

It uses a ramp-and-roller mechanism. The rollers wedge between the races in the locking direction and disengage during rotation in the freewheeling direction.

What is the torque capacity of ASNU 15?

Reference ASNU 15 catalogues specify a nominal torque capacity of 30 Nm. The exact rating of the NAF-branded product must be confirmed with its manufacturer documentation.

What is the maximum overrunning speed of ASNU 15?

Reference specifications indicate 2,400 r/min for inner race overrunning and 3,600 r/min for outer race overrunning. These values require confirmation for the exact NAF execution.

Can ASNU 15 replace a 6302 ball bearing?

No. Although both components have a 15 mm bore and 42 mm outside diameter, ASNU 15 is a directional torque-transmission clutch, while 6302 is a radial ball bearing. Their widths and mechanical functions differ.

Can ASNU 15 be used as a backstop?

Yes, the ASNU clutch design can be used for backstopping in a correctly engineered system. Torque capacity, locking direction and safety requirements must be evaluated before installation.

Does ASNU 15 require lubrication?

Yes. Appropriate lubrication is required for the ASNU mechanism. The lubricant type and method must be confirmed for the specific manufacturer and operating conditions.

Is ASNU 15 NAF interchangeable with other ASNU 15 clutches?

Not automatically. Identical dimensions do not guarantee matching torque ratings, mounting tolerances, locking characteristics or operating speed limits.

ASNU 15 NAF - Key Technical Information

ASNU 15 NAF is a roller-type one-way freewheel clutch with dimensions of 15x42x18 mm. Its ramp-and-roller mechanism transmits torque in one direction and permits overrunning in the opposite direction. The clutch requires external bearing support, appropriate mounting and lubrication. Typical functions include overrunning, indexing and backstopping. Torque capacity and permissible speeds must be confirmed for the exact NAF execution.

ASNU 15 NAF at simmering.pl

ASNU 15 NAF 15x42x18 mm can be searched by its product designation and dimensions at simmering.pl.

Based in Lublin, Poland, simmering.pl supplies industrial bearings, sealing products and mechanical transmission components to maintenance departments, technical purchasing teams and international B2B customers.

For one-way clutches, accurate product identification is particularly important because torque capacity, locking direction and mounting requirements may differ between manufacturers.

Stock availability, dispatch times and international shipping options can be confirmed when submitting an inquiry.