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Products
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Anti-loosening nut (locking nut)
Anti-loosening nut is a nut that prevents the nut from loosening through special design.
Description
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Product definition and core types
Anti-loosening nut is a nut that prevents the nut from loosening through special design. Common types include:
Nylon insert anti-loosening nut (DIN985): built-in nylon ring, filling the thread gap by extrusion, excellent vibration resistance;
All-metal anti-loosening nut (DIN2510): generates continuous friction through elastic deformation or metal inserts, suitable for high temperature environment.
Core materials and characteristics
Material:
Nylon insert type: Q235 carbon steel + PA66 nylon, no red rust after 48 hours of salt spray test;
All-metal type: 35CrMoA alloy steel, surface plated with zinc or black, temperature resistance -56℃ to +170℃
Features:
Vibration resistance: Nylon insert type can withstand moderate vibration, and all-metal type is suitable for high-frequency vibration;
Removability: Nylon insert type can be reused 3-5 times, and all-metal type can be reused more times;
Environmental protection: Nylon insert is RoHS-compliant, and all-metal type is REACH-compliant.
Functions and applicable scenarios
Functions:
Prevent bolts from loosening due to vibration, impact or temperature changes;
Ensure the long-term reliability of key connections (such as engines and bridges).
Scenario:
Automobile engine (cylinder head bolts), mining machinery (crusher connection), wind power equipment (spindle flange).
Installation and maintenance
Installation:
Nylon insert type: Tighten according to the standard torque to avoid excessive extrusion of the nylon ring;
All-metal type: Use a torque wrench to ensure that the elastic deformation meets the requirements.
Maintenance:
Nylon insert type: Avoid using in high temperature (>120℃) or solvent environment;
All-metal type: Check the elastic parts regularly for fatigue and replace them in time.
Purchase suggestions
Select nylon insert type for normal vibration environment and all-metal type for high temperature vibration environment;
For high-precision scenarios such as aerospace, give priority to models certified by AS 9120 B.
Comparison and selection guide of the six major nuts
| Type | Electroplated galvanized flange nut | Electroplated galvanized nut | Colored zinc-plated nut | Anti-loosening nut | High-strength blackened nut | Welding nut |
| Core advantages | Dispersed pressure, anti-loosening | Low cost, strong versatility | High corrosion resistance, color identification | Anti-vibration, removable | High strength, high temperature resistance | Permanent connection, convenient |
| Salt spray test | 24-72 hours | 24-72 hours | 72-120 hours | 48 hours (nylon) | 48 hours without red rust | 48 hours (galvanized) |
| Applicable temperature | -20℃~80℃ | -20℃~80℃ | -20℃~100℃ | -56℃~170℃ (all metal) | -40℃~200℃ | -20℃~200℃ |
| Typical scenarios | Pipe flange, steel structure | General machinery, indoor environment | Outdoor equipment, humid environment | Engine, vibration equipment | High temperature machinery, vibration equipment | Automobile manufacturing, construction machinery |
| Installation method | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Torque wrench tightening | Welding fixation |
| Environmental protection | Cyanide-free process complies with RoHS | Cyanide-free process complies with RoHS | Trivalent chromium is more environmentally friendly | Nylon complies with RoHS | No heavy metal pollution | No special requirements |
Selection suggestions:
High sealing requirements: electroplated zinc flange nut, with gasket to enhance sealing;
High corrosion environment: color-plated zinc nut, chromium-free passivation process is preferred;
Vibration environment: anti-loosening nut, all-metal type is suitable for high temperature scenes;
High temperature and high load: high-strength blackened nut, matched with 10.9 grade bolts;
Permanent connection: welding nut, projection welding or spot welding type is selected according to the process.
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Related popular products
Black zinc flange bolts
The head of the flange bolt has a round flange to increase the contact area and disperse the pressure (standard GB/T 5787, GB/T 5789). Common specifications M6-M30, material Q235 or 35CrMo, surface galvanized or blackened.
Electrogalvanized expansion bolts
It consists of countersunk bolts, expansion tubes, flat washers, spring washers and hexagonal nuts. The material is mostly carbon steel (such as Q235), and the thickness of the electrogalvanized layer is 5-12μm, which meets ISO 1461 or GB/T 13912-2002 standards.
Colored zinc-plated expansion bolts
The color zinc passivation process (c2C) is adopted, the coating thickness is 8-15μm, and the corrosion resistance of the salt spray test is more than 72 hours, which has both anti-corrosion and decorative functions.
Electrogalvanized hinge bolts
Swivel Bolt Series Structural Features • Basic Structure: Typically consists of a screw, a nut, a...
Hexagon socket electrogalvanized bolts
The hexagon socket bolt head has a hexagon socket hole and needs to be tightened with a hexagon socket wrench (standard GB/T 70.1). Common materials are 35CrMo or 42CrMo, and the surface treatment is divided into three types: electrogalvanized, color zinc-plated, and black zinc-plated.
Electroplated galvanized flange nut (flange face nut)
Electroplated galvanized flange nut is a special nut with a circular flange added to one end of the hexagonal nut. The flange increases the contact area with the connected parts, disperses the pressure and enhances the shear resistance. Its structure includes threaded section, flange and galvanized layer. Some models have anti-slip teeth on the surface of the flange (such as DIN6923 standard).
Electro-galvanized hexagonal drill thread
Made of 1022A carbon steel, the surface hardness reaches HV560-750 after heat treatment, and the core hardness reaches HV240-450. The surface is electro-galvanized to form a 5-12μm coating, which meets the GB/T 13912-2002 standard, and the salt spray test reaches 24-48 hours without white rust.
Black zinc plated countersunk cross bolts
The head of the countersunk cross bolt is conical and can be completely embedded in the surface of the connected parts to maintain a smooth appearance (standard GB/T 68). Common materials are carbon steel, stainless steel or engineering plastics (such as nylon 66), with galvanized or natural color treatment on the surface.
Electroplated zinc flange bolts
The head of the flange bolt has a round flange to increase the contact area and disperse the pressure (standard GB/T 5787, GB/T 5789). Common specifications M6-M30, material Q235 or 35CrMo, surface galvanized or blackened.
7-shaped anchors (7-shaped anchor bolts)
The 7-shaped anchor is named because one end of the bolt is bent in a “7” shape. It is one of the most basic types of anchor bolts. Its structure includes a threaded rod body and an L-shaped hook. The hook part is buried in the concrete foundation and connected to the equipment or steel structure through a nut to achieve a stable fixation.
Electrogalvanized pins
GB/T 882-2008 “Pin” standard, nominal diameter 3-100mm, materials include carbon steel, stainless steel, etc., electrogalvanized layer thickness 5-12μm, in line with c1B or c1A post-treatment requirements.
Welding nails
Welding studs are cylindrical head welding studs fixed to the parent material by arc stud welding (standard GB/T 10433), made of SWRCH15A or ML15, with tensile strength ≥400MPa and yield strength ≥320MPa.
Carriage bolt (half-round head square neck bolt)
The head of the carriage bolt is a large semicircle, and the neck is square to prevent rotation (standard GB/T 14). Common materials are Q235 or stainless steel, with galvanized or blackened surface.
Stud bolts
Stud bolts have threads at both ends and a bare rod in the middle, which is used to connect thick plates or penetrate installation (standard GB/T 901). Common materials are 45# steel or 40Cr, with galvanized or blackened surface.
Electrogalvanized embedded plate
Q235 or Q355 carbon steel, the thickness of the steel plate is usually 6-50mm, the diameter of the anchor bar is 8-25mm, in line with GB/T 700 or GB/T 1591 standards.
Colored zinc-plated cross countersunk drill thread
The thickness of the color zinc passivation film is 8-15μm, the salt spray test is more than 72 hours, and the appearance is rainbow-colored. When trivalent chromium passivation is used, the environmental protection performance is excellent.
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