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Locknut RN Series Ball Screw Bracket

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Locknut RN Series Ball Screw Bracket

Locknut RN Series Ball Screw Bracket

The RN series is a high-strength, high-precision specialized locknut. Through its special thread, end face structure, and matching anti-loosening components, it rigidly locks the rotating shaft shoulder of the ball screw to the inner ring of the angular contact bearing within the fixed end support base. It is not an ordinary nut, but an indispensable standard functional component in the ball screw fixed end assembly, directly affecting the system's backlash, rigidity, and long-term stability.

Technology

The core value of the Locknut RN Series Ball Screw Bracket lies in its reliable locking and anti-loosening mechanism, which is fundamentally different from ordinary nuts.

Feature Dimensions RN Series Locking Nuts Standard hexagon nuts
Core Functions Precision locking and anti-loosening: Specifically designed to lock bearings under high-speed forward and reverse rotation and high-impact conditions. General-purpose fastening: Used for connections subjected to standard static or low dynamic loads.
Anti-loosening Design Integrated anti-loosening design: Typically features an asymmetrical thread profile (such as an eccentric thread) and must be used in conjunction with a dedicated anti-loosening washer (usually a star washer) to achieve mechanical anti-loosening. Rely on friction or the use of anti-loosening aids such as spring washers or adhesive.
Precision and Contact High-precision contact surface: The surface in contact with the bearing is precision-ground to ensure full-surface contact, uniform transmission of preload, and prevention of bearing misalignment. The parallelism and surface finish of the end faces are generally standard.
Ease of Installation Specialised installation tool: Typically requires a double-hole hook wrench for tightening to ensure precise torque application without damaging the nut. Use a standard spanner.
Reliability Extremely high. Rigorously tested and suitable for demanding conditions involving high speeds, high frequencies and heavy loads. Prone to loosening under dynamic loads.

Main Technical Parameters and Design
1. Precision Anti-loosening Principle:
Eccentric thread design: The nut's thread uses a special eccentric tooth profile. When tightened with the standard thread on the ball screw shaft end, it generates a continuous radial locking force, effectively preventing loosening.
Anti-loosening washer combination: The standard configuration includes an internal-toothed anti-loosening washer (spline washer). During installation, the inner teeth of the washer engage with the keyway of the ball screw shaft, and the outer teeth engage with the groove on the nut's end face. Through tooth engagement, it completely prevents any rotation of the nut relative to the shaft.

2. Materials and Process:
Made of high-strength alloy steel and heat-treated to ensure sufficient strength and toughness, preventing fracture or deformation under high pre-tightening force.
Key contact surfaces (threads, end faces) are precision ground to ensure dimensional accuracy and mating performance.

3. Specifications and Matching:
The size series is fully compatible with the ball screw shaft end thread diameter (such as M6, M8, M10...M30, etc.) and the support base series.
Depending on different ball screw shaft diameters and load requirements, standard and thickened versions are available to provide a larger locking contact area and torque capacity.

Applications
The Locknut RN Series Ball Screw Bracket must be used in all ball screw systems that use angular contact bearing fixed end support bases, including but not limited to:
The feed axis fixed end of all CNC machine tools.
The joint or linear axis drive end of industrial robots. The transmission systems of high-precision automated equipment (laser machines, injection molding machines, measuring machines).
Any ball screw application requiring zero backlash and high rigidity transmission.

Although small, the Locknut RN Series Ball Screw Bracket is a crucial mechanical safety component in the high-precision ball screw transmission chain. Through precise mechanical design, it fundamentally solves the risk of loosening under high-speed and heavy-load conditions, converting rotational power into linear thrust without loss. Choosing original or high-quality RN series locknuts is a necessary guarantee for the safety and stable performance of your entire precision transmission system.

Parameters

Model No. H A E M B G
RN05
RN05-N
5 12.5 2.7 M3X0.5 11 M5X0.5
RN06
RN06-N
13.5  2.7  M3X0.5 12  M6X0.75
RN08
RN08-N
6.5  16.4  M3X0.5 14  M8X1.0
RN10
RN10-N
19  5.5  M3X0.5 16  M10X1.0
RN12
RN12-N
22.8  5.5  M4X0.7 19  M12X1.0
RN15
RN15-N
25.8  4.75  M4X0.7 22  M15X1.0

Model No. H A E M B G
RN17
RN17-N
13 29 9 M4 24 M17X1.0
RN20
RN20-N
11  35  M4 30  M20X1.0
RN25
RN25-N
15  43  10  M6 35  M25X1.5
RN30
RN30-N
20  48  14  M6 40  M30X1.5
RN35
RN35-N
21  60  14  M6 50  M35X1.5
RN40
RN40-N
25  62  18  M6 50  M40X1.5

Drawings

Model No. Part Name Qty
6 Lock nut 1set
7 Hexagon socket-head
Setscrew(With set piece)
2