Product Description

AM45 INA is a precision bearing locknut manufactured under the INA brand, part of the Schaeffler Group. It features an M45x1.5 internal thread, a 70 mm outside diameter and an overall height of 22 mm. The locknut is designed for accurate axial positioning and securing of bearings and other mechanical components on threaded shafts or spindles.

The AM45 belongs to the INA AM series of precision locknuts and incorporates six clamping segments secured by locking screws. This construction enables the locknut to maintain its adjusted axial position without relying on a conventional tab washer.

Precision locknuts are particularly relevant in bearing arrangements where accurate axial positioning, controlled clamping and reliable locking are essential.

Technical Specifications - INA AM45

The listed dimensions and technical values correspond to Schaeffler catalogue data for the AM45 precision locknut.

Important: The limiting axial load of 360,000 N is a strength-related parameter of the locknut. It must not be interpreted as the permissible operating load of the complete bearing arrangement.

The reference tightening torque of 65 Nm is associated with the specified loosening torque test conditions. It is not a universal installation torque for every application.

What Does AM45 INA Mean?

AM - Precision Locknut Series

AM identifies a series of precision locknuts designed for axial positioning and securing of mechanical components.

The design incorporates clamping segments and locking screws to maintain the selected axial position.

45 - Nominal Thread Diameter

The number 45 identifies the nominal thread diameter of 45 mm.

The AM45 precision locknut has an M45x1.5 metric fine thread.

INA - Manufacturer Brand

INA is a brand of the Schaeffler Group, a manufacturer of bearings, precision locknuts and industrial motion components.

Construction and Operating Principle

Six Clamping Segments

The INA AM45 precision locknut incorporates six clamping segments.

When the locking screws are tightened, the segments engage with the shaft thread to secure the locknut in its adjusted position.

This locking arrangement helps prevent unintended loosening during machine operation.

M45x1.5 Precision Thread

The fine-pitch metric thread allows accurate axial adjustment along a compatible threaded shaft.

Correct thread diameter, pitch and tolerance are essential for reliable installation.

The fine thread also enables controlled positioning of the locknut against the bearing ring or another axially located component.

Axial Contact Surface

The locknut's axial contact face transfers clamping force to the adjacent bearing ring, spacer or other mechanical component.

Correct contact between the mating surfaces is important for accurate axial positioning and uniform force transmission.

Integrated Locking Mechanism

The AM45 uses M6 locking screws to operate its clamping mechanism.

The catalogue tightening torque for these screws is 5 Nm.

This value must not be confused with the tightening torque applied to the complete locknut on the shaft.

What Is the INA AM45 Precision Locknut Used For?

The AM45 is intended for axial positioning and securing of appropriately designed mechanical components.

Typical applications include:

• Axial location of bearing inner rings.

• Precision spindle bearing arrangements.

• Ball screw support bearing assemblies.

• Industrial drive shafts.

• Bearing spacer arrangements.

• Machine tool spindle assemblies.

• Mechanical systems requiring accurate axial adjustment.

• Bearing arrangements requiring secure axial retention.

In precision bearing arrangements, a locknut may also be used as part of a preload adjustment procedure.

However, the required bearing preload must be determined from the bearing manufacturer's specifications and the mechanical design.

The locknut itself does not establish a universally correct bearing preload.

INA AM45 vs Standard Bearing Locknuts

Precision Locknut vs Conventional Locknut

The INA AM45 is designed for applications requiring accurate positioning and secure locking.

A conventional KM-series locknut may use a different thread pitch, axial width, locking method and contact surface geometry.

A standard locknut with a similar nominal thread diameter must not automatically be considered an interchangeable replacement.

Alternative Designations and Search References

The product may be identified using the following designation variants:

• AM45 INA

• AM 45 INA

• INA AM45

• Schaeffler AM45

• INA AM45 precision locknut

• AM45 bearing locknut

• M45x1.5 precision locknut

• INA AM45 shaft locknut

• AM45 precision bearing retaining nut

These are natural designation variants and descriptive references, not verified replacement part numbers from other manufacturers.

Selection and Interchangeability

Before purchasing INA AM45, verify the following parameters:

1. Complete designation: AM45.

2. Manufacturer: INA / Schaeffler.

3. Internal thread: M45x1.5.

4. Outside diameter: 70 mm.

5. Overall height: 22 mm.

6. Locking mechanism: Six clamping segments.

7. Locking screws: M6.

8. Available installation space: Sufficient clearance for mounting and locking.

9. Axial load requirements: Compatible with the locknut and shaft design.

10. Contact surface geometry: Suitable for the bearing or adjacent component.

11. Thread tolerance: Compatible with the shaft thread.

12. Required positioning accuracy: Appropriate for the application.

13. Bearing preload requirements: Defined by the bearing arrangement.

14. Installation procedure: Consistent with the manufacturer's recommendations.

Matching the nominal M45 thread diameter does not guarantee interchangeability.

The thread pitch, overall dimensions, locking mechanism and axial positioning requirements must also be checked.

Installation and Axial Adjustment

1. Prepare the Shaft Thread

Clean the shaft thread and inspect it for burrs, corrosion or mechanical damage.

Verify that the thread is M45x1.5 and compatible with the locknut.

2. Inspect the Contact Surfaces

Check the locknut contact face and the adjacent bearing ring or spacer.

The surfaces should be clean and free from damage that could affect axial positioning.

3. Install the Locknut

Thread the AM45 onto the shaft carefully.

Do not force the locknut if excessive resistance is encountered.

4. Adjust the Axial Position

Tighten and position the locknut according to the mechanical assembly requirements.

Where the locknut is used to adjust bearing preload, follow the bearing manufacturer's installation procedure.

5. Secure the Locking Mechanism

Tighten the M6 locking screws according to the manufacturer's specified procedure.

The catalogue tightening torque for the locking screws is 5 Nm.

6. Verify the Assembly

Check that the locknut is securely positioned and that the complete bearing arrangement operates correctly.

Inspect the assembly for excessive preload, abnormal resistance or unintended axial movement.

Do not automatically use 65 Nm as the installation torque for the locknut. This is a reference value associated with catalogue loosening torque conditions.

Maintenance and Storage

Periodic Inspection

During machine maintenance, inspect the locknut for signs of loosening, mechanical damage or corrosion.

Check the locking screws where accessible and according to the equipment maintenance procedure.

Bearing Arrangement Condition

In precision bearing assemblies, changes in vibration, temperature or axial play may indicate problems with bearing adjustment or mechanical condition.

The complete bearing arrangement should be inspected rather than adjusting the locknut without identifying the cause.

Storage

Store the locknut in a clean, dry environment.

Protect the internal thread, axial contact surfaces and locking mechanism against contamination and mechanical damage.

Frequently Asked Questions - INA AM45

1. What thread does INA AM45 have?

The INA AM45 precision locknut has an M45x1.5 metric fine internal thread.

2. What are the dimensions of AM45?

The outside diameter is 70 mm, and the overall height is 22 mm.

3. How many clamping segments does AM45 have?

The locknut incorporates six clamping segments.

4. What is the purpose of INA AM45?

It is designed to position and secure bearings and other mechanical components axially on a threaded shaft.

5. Can AM45 be used for precision bearing arrangements?

Yes. It can be used in appropriately designed precision bearing assemblies, including spindle and bearing support arrangements.

6. What is the tightening torque for the locking screws?

The catalogue tightening torque for the M6 locking screws is 5 Nm.

7. Does INA AM45 require a separate locking washer?

The AM series uses an integrated clamping mechanism. A conventional KM-type locking washer is not normally part of this locking arrangement.

8. Can AM45 be replaced by any M45 locknut?

No. The thread pitch, dimensions, locking mechanism, axial positioning accuracy and installation requirements must all be verified.

INA AM45 - Key Information

INA AM45 is a precision bearing locknut featuring an M45x1.5 internal thread, 70 mm outside diameter and 22 mm overall height. Its construction incorporates six clamping segments secured by M6 locking screws. The locknut is designed for accurate axial positioning and retention of bearings and other mechanical components on threaded shafts in precision machinery.

INA precision locknuts, bearing accessories and industrial components are offered through simmering.pl, a specialist supplier of bearings, oil seals and technical parts.

The company operates a warehouse in Lublin, Poland, supporting industrial customers, maintenance departments and B2B purchasing teams, with shipping throughout Poland, the European Union and international markets.