ZM 55 INA - Precision Locknut (M55x2)

Technical Specifications & Applications of ZM 55 INA Lock Nut

The ZM 55 INA is a precision locknut (lock nut / retaining nut) from the INA ZM series, designed for accurate axial fixing of rotating components such as bearing rings and machine shafts. Its main function is to secure axial positioning while ensuring high stability and minimal play in rotational assemblies.

This locknut features a metric thread M55x2, outer diameter 75 mm, and width 16 mm, making it compatible with standard 55 mm shaft systems and compact bearing housings.

Key Features & Advantages

• Thread size: M55 x 2 mm (fine thread for precision clamping)

• Outer diameter: 75 mm

• Width: 16 mm

• Contact face diameter: ≈ 68 mm

• Axial load capacity (break load): ≈ 229 kN (229,000 N)

• Material: High-grade bearing steel (hardened and precision-ground)

• Construction: One-piece machined steel nut with locking pins / set screws

• High axial precision: The thread and contact face are machined in a single setup, minimizing axial run-out and ensuring accurate alignment

• Locking method: Equipped with radial set screws that prevent loosening after tightening

• Finish: Corrosion-resistant surface with optimized fit for bearing mounting

The ZM 55 INA locknut guarantees excellent stability and positioning accuracy in both rotational and static mounting applications.

Typical Applications

This precision locknut is used in mechanical systems where accurate axial fixation is critical, including:

• Bearing seating and shaft end positioning

• Machine spindles and tool housings

• Industrial gearboxes and transmissions

• Automation equipment and rotating assemblies

• Mechanical drive units and high-speed machinery

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FAQ ( Frequently Asked Questions )

Q1: What is the ZM 55 INA locknut?
A1: It is a precision machined locknut used for axially fixing bearings and rotating components on shafts with thread M55x2, ensuring accurate positioning and high stability.

Q2: What are the exact dimensions of ZM 55 INA?
A2: Thread M55x2, outer diameter 75 mm, width 16 mm, contact face diameter ≈ 68 mm.

Q3: How much axial load can it handle?
A3: The typical axial load capacity (break load) is approximately 229 kN (229,000 N).

Q4: What is the purpose of a locknut like ZM 55?
A4: To securely position and lock bearings or rotating elements axially on a shaft, preventing unwanted movement or loosening under load.

Q5: How is it installed?
A5: Thread the ZM 55 onto a shaft with M55x2 thread, apply the recommended torque to the set screws to fix the nut securely, ensuring proper face contact and alignment.

Q6: In which types of machines is it used?
A6: Industrial machines, spindles, drives, motors, gearboxes, and automation systems that require high axial precision and bearing stability.

Q7: What are the delivery options and location?
A7: 📍 Warehouse & Store: Lublin, ul. Smoluchowskiego 1, building 4
🚚 24h shipping - fast and efficient order processing