Stainless Steel Carbon Steel Anti Loosening Nut Jinmao U Shape Hex Lock Nut

• Vibration-Proof Locking

  The U-shaped bridge deforms elastically when tightened, creating a constant prevailing torque that prevents loosening under shock or vibration.

  Material Excellence

  – Stainless steel: AISI 304 (A2) or 316 (A4), passivated, 1 000 h salt-spray
  – Carbon steel: C1018, case-hardened spring clip 450 HV, zinc-blue 8 µm, 48 h salt-spray

• Reusable & Tool-Free

  Unlike nylon-insert lock nuts, the all-metal design withstands repeated assembly/disassembly without loss of locking performance.

• Jinmao Brand Assurance

  Produced in ISO 9001-certified facilities with full batch traceability and 100% thread gauging; each nut is laser-marked with the Jinmao logo for authenticity.

• Wide Temperature Range

  Performs from -80 °C to +300 °C, making it ideal for high-heat exhaust systems or cryogenic piping.

• The anti-loosening ability (ratio of remain-ing to initial clamping force) obtained6X92.87%=5.5722 super high score

• Convenient installation, no special toolsrequired, installation time less than 4minutes, obtaining a full score of 1.5 points;

• The reuse rate, tooth pattern, andappearance are standard and can bereused, achieving a maximum score of 1point;

• installation height (including nuts, wash-ers, or other anti-loosening accessories)one nut can prevent loosening, obtaining afull score of 1 point;

• Do you need to change the structure ofthe connected parts? lf no changes areneeded, a full score of 0.5 points will beobtained

Obtained a total score of 9.58 superhigh----Jinmao brand U-shaped lock nut

In this competition, 30 types of anti-loosen-ing fasteners participated, covering theJapanese Hadlock double nuts and the American Spiralock wedge tooth lines prevent loose principle technology, as welas various changes and innovative products,The Jinmao brand U-shaped anti looseningnuts achieved excellent results.Jinmao nut isa U-shaped structure that prevents loosen-ing, which is different from the technica!route of increasing friction and preventing loosening in many products. lt can fullyserve as a representative of China's nut loosening technology.

Foming three major nut loosening preven-tion technologies globally:
China Jinmao brand U-shaped structure anti-loose
United States Sprialock wedgetooth lines prevent loose
Japan Hardlock double nut lock

• Thread Size: M4 – M24 (UNC/UNF available)
  Hardness: ≥ 200 HV
  Finish: Passivated or polished mirror finish
  Proof Load: ≥ 500 MPa (grade A2-70 / A4-80)
  
  

• The packaging quantity varies by production batch. Customization can be made according to customer requirements
• Free samples and material certificates (EN 10204 3.1) on request
• 24-hour technical support and global logistics network

• Rail & Transport

  Bogie suspension, rail fastening, truck chassis

• Renewable Energy

  Wind-turbine nacelle bolts, solar-tracker joints

• Marine Hardware

  Dock cleats, mast fittings, propeller shaft couplings

• Heavy Machinery

  Vibrating screens, crusher frames, concrete pumps

• Infrastructure

   Expansion-joint rails, bridge bearings, stadium seating