Heavy-Duty Adjustable Round Nut Locking Nut for Maximum Security

• Customization: Available
• Material: Carbon Steel
• Type: Round Head
• Model NO.: 1-1
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN
• Grade: 8.8
• Surface Treatment: Oxidation Black
• Product Grade: a-Level
• Thread Type: Full Thread
• Applicable Industries: Construction, Industry
• Transport Package: Container
• Specification: 1-100
• Trademark: Huilin
• Origin: Handan, Hebei
• HS Code: 0101101010
• Production Capacity: 50000

Product Description

Exquisite Overview of Anti-Retreat Round Nut

The Anti-Loosening Round Nut, often dubbed the 'Round Nut' or 'Anti-Loosening Round Nut', boasts a specialized design that secures fasteners with a unique mechanical or friction-based anti-loosening mechanism. Primarily used for axial fixation of shaft components, like rolling bearings, it effectively prevents loosening resulting from vibrations or impacts. Discover its standout features and usage guidelines below:

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1. Fundamental Definition

This anti-backlash round nut features a sleek, thin-walled annular design, with a precise threaded inner hole (ranging from M10 × 1 to M200 × 3). The outer circle sports a groove or opening and is designed to work harmoniously with a stop washer (popularly called 'Wang Ba Pad'). The anti-loosening mechanism divides into two distinct categories:

Mechanical Locking: This approach employs the interlocking of inner and outer teeth of the stop washer into the nut groove and shaft keyway, creating a firm and rigid limitation.

Friction Anti-Loosening: Certain models utilize a wedge-shaped inclined surface design or apply an engineering plastic coating to the surface, enhancing thread friction (exemplified by HARDLOCK nuts).

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Structural Features

1. Slot Design:

Equipped with equidistant open slots on the outer circle, these slots align with the outer teeth of the stop washer. Once installed, the washer teeth bend to achieve effective mechanical locking.

2. Material and Craftsmanship:

Carbon Steel (45# Steel): Undergoes heat treatment achieving hardness of HRC35-45, ideal for general industrial applications.

Stainless Steel (304/316): Offers robust corrosion resistance, making it perfect for humid or chemical-rich environments.

Surface Treatments: Options like blackening, galvanizing, or spraying with engineering plastics amplify wear resistance and rust prevention capabilities.

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3. Anti-Loosening Mechanism

1. Mechanical Locking Type:

Utilizing the interlocking of the stop washer's inner and outer teeth with the shaft keyway and nut groove, relative rotation between the nut and shaft is curtailed, suitable for high-vibration environments (e.g., elevators and mining machinery).

2. Friction Anti-Loosening Type:

Wedge Slope Design: This utilizes an eccentric wedge-shaped contact surface between threads to distribute locking force evenly (like HARDLOCK nuts), providing exceptional vibration resistance, adopted in renowned projects like Japan's Shinkansen.

Plastic Spraying Technology: Engineering plastics are sprayed onto the threaded surface to induce elastic deformation, enhancing friction upon tightening, though it has limited temperature resilience (-50 ºC~120 ºC).

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4. Application Scenarios

Bearing Fixation: Essential for the axial locking of rolling bearings, preventing unwanted shaft movement.

Heavy Machinery: Ideal for shaft end fastening in mining equipment and bridge steel structures, enduring high vibration loads.

Rail Transit: Wedge-shaped anti-loosening nuts are crucial for key components like high-speed rail hubs and bogies, ensuring enduring stability.