Detailed analysis of Spieth MSR series locking nuts from Germany

NegotiableUpdate on 05/20

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Overview

As a brand that has been deeply involved in the field of precision machinery for more than 70 years, Spieth Germany's MSR series locking nuts are the brand's classic core products. Based on the Spieth principle design, they have become the preferred component in the global precision machinery field with micrometer level accuracy and stable locking performance. They are widely used in various scenarios with strict requirements for locking accuracy and rigidity. All parameters are based on original factory measurements, compliant, and have high reference value. Detailed analysis of Spieth MSR series locking nuts from Germany

Product Details

1、 Core positioning and design principles of MSR series

The MSR series is a precision threaded locking nut designed by Spieth specifically for the demanding tasks of mechanical engineering. Its core advantage lies in the "dual function" integrated design, which differs from the traditional axial locking method of nuts. Through the built-in precision bevel system, uniform radial clamping force is generated during tightening. At the same time, a precision grinding clamping ring is integrated, which combines locking and shaft sleeve protection functions without the need for additional grooves or locking plates. It simplifies the shaft structure while ensuring spindle concentricity and adapting to various high-precision transmission scenarios.

Its design follows Spieth's core technology concept - seamless, high rigidity, adjustable precision locking and connection technology. Through axial tension and uniform load design, it can achieve synchronous locking of multiple bolts, ensure balanced compression of the connection surface, avoid loosening, wear and other problems from the root, and adapt to long-term high-frequency operating conditions.

2、 Full specification detailed parameters (measured by the original factory)

The MSR series covers a full range of specifications from 6mm to 200mm shaft diameter, with a wide range of thread specifications to meet different working conditions. The core parameters follow German industrial standards, and some models comply with DIN6331 standards. The specific parameters are as follows:

（1） Basic core parameters

Suitable shaft diameter range: 6mm-200mm (covering small equipment to large machine tool requirements)
Thread specifications: M6 × 1 to M200 × 3, covering various specifications of fine and coarse threads, with typical specifications such as M10 × 0.75, M12 × 1, M20 × 1.5, M60 × 1.5, M100 × 2, etc
Rated axial load: 8kN-280kN, gradually increasing with the increase of shaft diameter, suitable for different load scenarios
Static locking torque: 0.5N · m-120N · m, precise and controllable torque, ensuring reliable locking
Material: Made of high-strength alloy steel with uniform texture and excellent toughness, capable of withstanding high-frequency vibration and impact
Surface treatment: Professional hardening treatment is adopted, with a hardness of HRC 56-60, wear-resistant, corrosion-resistant, and extended service life
Working temperature: -20 ℃~+120 ℃, suitable for most industrial working conditions, without significant performance degradation
Concentricity difference: ≤ 0.005mm, ensuring smooth spindle operation and improving equipment machining accuracy

（2） Mainstream model details and corresponding ordering relationships

The MSR series has a complete range of models, covering hundreds of specifications. The following are commonly used mainstream models and core information for easy selection and ordering:

MSR 10.075: Shaft diameter 10mm, thread M10 × 0.75, order corresponding to K-10101001, suitable for small precision instruments
MSR 12.1: Shaft diameter 12mm, thread M12 × 1, suitable for light machine tool spindle, static locking torque 1.2N · m
MSR 20.1.5: Shaft diameter 20mm, thread M20 × 1.5, rated axial load 35kN, suitable for medium-sized transmission equipment
MSR 60.1.5: Shaft diameter 60mm, thread M60 × 1.5, compliant with DIN6331 standard, suitable for large machine tools
MSR 100.2: Shaft diameter 100mm, thread M100 × 2, rated axial load 280kN, suitable for heavy-duty working conditions
MSR 200.3: Shaft diameter 200mm, thread M200 × 3, static locking torque 120N · m, suitable for large heavy equipment

In addition, it also includes intermediate specifications such as MSR 14.1.5, MSR 30.1.5, MSR 50.1.5, etc., which can be accurately selected according to equipment shaft diameter and load requirements. All models are produced by German manufacturers and support original factory traceability.

3、 Core design highlights and product advantages

Seamless locking: Designed with radial uniform clamping force, eliminating all radial and axial clearances, ensuring positioning accuracy and repeatability, suitable for precision transmission scenarios such as machine tool spindles, robot joints, etc.
Integrated structure: The load thread, locking thread, and end face are inseparable parts of the nut body, with integrated clamping ring function, which can replace the traditional combination of "nut+spacer+locking device", simplify the installation structure, and save equipment space.
Excellent protective performance: Uniform radial clamping force avoids indentation on the shaft, effectively protects the shaft and bearing inner holes, reduces wear, and is easy to disassemble and reinstall, extending the overall service life of the equipment.
High precision machining: All contact surfaces (threads, end faces, clamping rings) are precision ground with tolerances controlled at the micrometer level to ensure concentricity and perpendicularity, improving equipment operation stability.
Easy installation: No need for specialized tools, can be quickly assembled and disassembled, suitable for batch installation scenarios, reduces construction difficulty and labor costs, and has better installation efficiency than traditional locking nuts.
Strong wear resistance: The surface hardening treatment combined with high-quality materials has better resistance to micro motion wear than traditional nuts, and can withstand long-term high-frequency operation, reducing maintenance frequency.

4、 Applicable scenarios and application areas

The MSR series, with its advantages of high precision and rigidity, is widely used in fields that require precision, rigidity, and dynamic performance, including:

Machine tool field: The spindle system of CNC machine tools, machining centers, grinders, and lathes ensures smooth spindle operation, improves machining smoothness and dimensional accuracy.
In the field of precision transmission, robot joint precision reducers, planetary reducers, and harmonic reducers achieve seamless transmission and improve equipment motion accuracy.
Aerospace field: Aircraft actuation systems, navigation equipment, adapting to operating conditions to ensure stable operation of equipment.
In the field of precision instruments, CT scanners, MRI equipment, and semiconductor manufacturing equipment (such as lithography machines) are used to meet micrometer level positioning requirements.
General industrial fields: conveyor technology, printing machinery, packaging machinery, measurement and testing equipment, etc., suitable for various high-frequency and high-precision locking scenarios.

Detailed analysis of Spieth MSR series locking nuts from Germany