ZM25 INA - Precision Locknut (M25x1.5)

Technical Specifications and Applications of the ZM25 INA Lock Nut

The ZM25 INA is a precision locknut (retaining or clamping nut) from the renowned INA ZM series, engineered for the secure and accurate axial fixing of bearings, rings, and rotating components on shafts.
This model ensures high alignment precision and stable positioning in demanding mechanical applications.

Key Features and Advantages

• Thread size: M25 x 1.5 (fine thread for precise clamping)

• Outer diameter: 38 mm

• Width: 12 mm

• Contact face diameter: approx. 32 mm

• Axial load capacity (breaking load): ~ 90 000 N

• Reference tightening torque: ~ 25 Nm

• Breakaway torque: ~ 60 Nm

• Set screw torque: ~ 5 Nm

• Construction: Hardened steel locknut with radial locking screws for vibration resistance

• Precision machining: Thread and face surface are machined in one setup to ensure perfect concentricity and minimal runout

• High strength and wear resistance: Manufactured from high-grade bearing steel, ideal for long-term industrial use

• Compact size: Suitable for small-diameter shafts and bearing housings where space efficiency is required

The ZM25 locknut guarantees perfect axial alignment, reducing bearing stress and preventing loosening during high-speed operation.

Typical Applications

The INA ZM25 precision locknut is used wherever precise axial fixation is critical, including:

• Mounting of rolling bearings on shafts

• Preloading of bearing assemblies

• Positioning of rotating components and flanges

• Machine spindles, automation systems, and industrial drives

• Gearboxes, tool holders, and high-precision machinery

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FAQ (Frequently Asked Questions)

Q1: What is the ZM25 INA locknut?
A1: The ZM25 INA is a precision-engineered locknut designed for axial fixing of bearings and rotating parts on shafts with thread M25x1.5, ensuring stability and alignment.

Q2: What are its dimensions?
A2: Thread M25x1.5, outer diameter 38 mm, width 12 mm, contact face diameter approx. 32 mm.

Q3: What is the load capacity of ZM25 INA?
A3: The typical axial breaking load is about 90 kN (90 000 N).

Q4: How is it installed?
A4: The locknut is screwed onto the shaft thread and tightened using the specified torque. Radial set screws are then fastened to prevent unintentional loosening.

Q5: In what types of machinery is this locknut used?
A5: Industrial drives, gearboxes, automation units, machine tools, and spindles where precise axial positioning of bearings or rotating parts is required.

Q6: Is lubrication needed?
A6: The nut itself does not require lubrication; lubrication depends on the bearing or component being secured.

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