PRODUCT
Material: stainless steel；Carbon Steel
Finish: Plain；Zinc plated,Dacromet,hot-dip galvanizing, zinc-flake coating, passivation, phosphate and oil, black oxide, and various polymer topcoats.
Certification: CANS;MA;ilac-MRA
MOQ:1PCS
Place of Origin: Zhejiang China
Product Details
U Shape Hex Lock Nut
Jinmao brand U Shape Hex Lock Nut
The U-shaped structure anti loosening principal technology has obtained a national invention patent with patent number ZL 2021 1 0487670.0.
We transfer the position of the vibration force by changing the structure of the nut, transmitting the vibration force to the top of the nut, forming a centripetal tightening force, achieving the best anti loosening effect, and creatively achieving:
One nut can prevent loosening
Repeated installation and never loosening
The vibration stronger, the grip tighter
The U-shaped structure patent for invention, with its flexible anti-loosening feature that gets tighter with vibration, can prevent loosening with just one nut and allows for normal installation and disassembly. It is widely applied in various scenarios requiring tight fastening and anti-loosening, such as unmanned aerial vehicles, precision instruments, electronic appliances, photovoltaic new energy, State Grid electrical equipment, and general machinery.
Specification
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Product name
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JINMAO U Shape Hex Lock Nut |
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Finish
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plain；Zinc plated,Dacromet，hot-dip galvanizing, zinc-flake coating, passivation, phosphate and oil, black oxide, and various polymer topcoats. |
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Measurement
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Metric, Imperial (Inch)
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Application
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Heavy Industry, Mining, Water Treatment, Healthcare, Retail Industry, Food & Beverage, General Industry, Oil & Gas, Automotive Industry
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Brand Name
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JMAO |
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Standard
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OEM,ODM
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MOQ
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1 Pcs
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Material
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Stainless steel,Carbon steel
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Grade
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A2-70,A4-80,4.4,8.8,10.9,12.9
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Service
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Customized OEM
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Size
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M4-M24
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| 304 Chemical Composition(%) | ||||||||
| Grade | C≤ | Mn≤ | Si≤ | S≤ | P≤ | Cr | Ni | N≤ |
| 0.08 | 2 | 0.75 | 0.03 | 0.045 | 18.0-20.0 | 8.0-10.5 | 0.1 | |
| 304 Mechanical property | |||
| σb≥ | σ0.2≥ | δ5 (%)≥ | Hardness(HB)(kgf/mm2)] |
| 520(Mpa) | 205(Mpa) | 40% | ≤187 HRB≤90 HV ≤200 |
Standard export packing or According to customer's requirement
A: Our main products are Bolts,Nuts,Screw ,Threaded rod ,Washer and other mechanical parts.
Q2. What is your MOQ?
A:Usually the MOQ for hex nut is 1000pcs.
Q3. Do you accept DEM & ODM?
A: Of course ! We support OEM & ODM! We can make the products according to customers' design and specifications. Our company is experienced in making Hex nut and has already provide this service to many customers around the world.
Q4. Can you provide a sample?
A:Sure,Our sample is provided free of charge, but not including express charge .
Q5. How long is your delivery time?
A: For OEM or ODM products, it takes 30 to 45 days . For standard products, it take 7 to 15 days
Key Feature
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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
Manufactured from AISI 304/316 stainless steel, Carbon Steel，ensuring superior corrosion resistance for marine, chemical, and outdoor environments. -
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.
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Rail & Transport: Bogie suspension, rail fastening, truck chassis
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Renewable Energy: Wind-turbine nacelle bolts, solar-tracker joints
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Marine Hardware: Dock cleats, mast fittings, propeller shaft couplings
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Heavy Machinery: Vibrating screens, crusher frames, concrete pumps
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Infrastructure: Expansion-joint rails, bridge bearings, stadium seating
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Product Name
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English Brand | Model Name | Article No | Unit | Packing Unit |
Packing Instruction |
Quantity of included products |
MOQ | Goods in Stock | Delivery |
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JinMAO Anti-Slip U Shape Hex Lock Nut
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JMAO | M4 | JMSSM17-4 | Piece | Bag |
The packaging quantity varies according to the production batch. It can be customized according to customer requirements. |
1000 | 1 | Y | 25DAY |
| M5 | 1000 | Y | ||||||||
| M6 | 1000 | Y | ||||||||
| N8 | 500 | Y | ||||||||
| M10 | 200 | N | ||||||||
| M12 | 200 | N | ||||||||
| M14 | 200 | N | ||||||||
| M16 | JMCS1035K | BOX | 200 | Y | ||||||
| M20 | 200 | Y | ||||||||
| M22 | 150 | N | ||||||||
| M24 | 150 | Y |
- 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
