Hexagon Nylon Insert Lock Nut

Product introduction

The hexagonal nylon lock nut is a fastening nut with an annular nylon ring embedded in the standard hexagonal nut. It uses nylon elasticity to tighten the thread to achieve efficient locking. As an important auto parts nut, it is widely used in key parts such as chassis suspension, engine periphery, and body structure to meet stringent anti-loosening requirements under vibration conditions.

In actual applications, it is difficult for standard specifications to completely match the diverse assembly requirements, so a large number of non-standard nuts are used for special adaptation. For special structural requirements, we can develop special-shaped nuts, such as flange nylon lock nuts, thin structures, guide structures, etc. It supports full-process customization of thread specifications, hexagonal dimensions, flange structures and high and low-temperature resistant materials, provides one-stop service from sample development to batch delivery, and ensures product reliability through the IATF 16949 quality system.

 

Product design and features

Nylon insert anti-loosening: the annular nylon ring and the bolt thread form a 360° elastic hold, without relying on external washers or chemical glue, and the anti-loosening performance is stable and reliable

Reusable: Nylon inserts have good elastic recovery capabilities and maintain anti-loosening effect within the rated number of uses.

Standard hexagonal shape: adopts standard hexagonal head design, suitable for universal wrench tools, easy to install

Temperature adaptability: Nylon material adapts to the normal operating temperature range of -50°C to +120°C

No additional anti-loosening measures are required: a single part can effectively prevent loosening and simplify the assembly process

As a classic type of fastening nut, in addition to standardization, hexagonal nylon lock nuts can also develop special-shaped nuts according to customer needs, such as flange nylon lock nuts, thin nylon lock nuts, non-standard opposite side dimensions, etc.

 

Materials and application areas

Carbon steel: Performance level 8, 10, 12, surface treatment including galvanizing, Dacromet, phosphating, etc.

Stainless steel: SUS304, SUS316, suitable for corrosion-resistant environments

Alloy steel: used in special occasions with high strength requirements

Nylon insert:

High-quality polyamide (PA66), with good elasticity, wear resistance and anti-aging properties

Special materials such as high-temperature resistant nylon and low-temperature resistant nylon can be selected according to different environments.

 

Application areas:

Automobile manufacturing: As core auto parts nuts, they are widely used in key parts such as chassis suspension systems, engine peripheries, gearbox connections, body structural parts, seat fixings, etc., to meet the automotive industry's stringent requirements for anti-loosening reliability under vibration conditions.

Engineering machinery and agricultural machinery: suitable for high vibration and high impact working environments

Rail transit: used for train bogies, electrical cabinets, interior fixtures, etc.

Wind power generation: used for tower connection and equipment fixation inside the cabin

Home appliances and office equipment: Suitable for washing machines, air conditioners, fitness equipment and other equipment with vibration sources

 

Quality control and certification system

Raw material control:

Steel: 100% batch re-inspection to ensure that the chemical composition and mechanical properties comply with standards

Nylon material: Batch testing of hardness, elastic recovery rate, and temperature resistance

Process control:

Cold heading molding: Dimensional SPC monitoring to ensure hexagonal dimensions and nut height accuracy

Tapping process: 100% online inspection of thread pass and stop gauges

Nylon insert injection molding: Injection temperature, pressure, and curing time are strictly monitored to ensure that the nylon and nut body are firmly combined.

Surface treatment: salt spray test, hydrogen embrittlement test

 

Finished product testing:

Full size inspection: 100% optical screening of key dimensions

Mechanical properties: Guaranteed load, hardness test

Anti-loosening performance test: locking torque test, vibration anti-loosening test (according to GB/T 10431, ISO 16130 standards)

Reusable performance test: simulates the degradation of anti-loosening performance after repeated disassembly and assembly

 

Certification system

ISO 9001, IATF 16949 (automotive industry quality management system)

Products meet RoHS and REACH environmental protection requirements

PPAP (Production Part Approval Process) level three document package available

Third-party testing reports (such as SGS, TÜV) can be provided

For nuts with special shapes and non-standard nuts, we have established a special quality control process, from mold verification, first article confirmation to process capability analysis, to ensure that each customized product maintains a stable quality level even as the structural complexity increases.

 

Customized services

Structural customization: Flange structure: add an integrated flange, replace the gasket, improve the load-bearing surface and anti-loosening effect

Thin design: reduces nut height, suitable for installation locations with limited space

Guide structure: Add guide openings or chamfers to facilitate automated assembly

Error-proofing design: Add positioning bumps, color mark recognition, etc.

Size and thread customization: Thread specifications: metric (M3 – M36), inch, American and non-standard threads

Hexagonal dimensions across flats: standard flats, non-standard flats (such as thinning, thickening)

Outline: round, square, finned and other special shaped nuts

Material and performance customization: high strength grade: grade 10, grade 12 carbon steel

Corrosion resistance: stainless steel, Dacromet coating, hot-dip galvanizing

Special environment: high temperature resistant nylon (maximum +200°C), low temperature resistant nylon (minimum -70°C)

Functional integration: assembly design: nut + washer integration

Sealing function: Nylon insert has dual functions of anti-loosening and sealing

Development mode: supports customization of drawings, reverse engineering, and joint design

Sample cycle: 7–15 days, mass production cycle: 25–35 days

 

FAQ

Q: What is the anti-loosening principle of hexagonal nylon lock nut?

A: The inner diameter of the nylon insert is slightly smaller than the outer diameter of the bolt thread. When the bolt is screwed in, the nylon ring is squeezed to produce elastic deformation, forming a 360° radial holding force on the thread, thereby effectively preventing vibration and loosening. This is a physical method of locking that does not rely on external gaskets or chemical glue.

 

Q: In the automotive field, where are hexagonal nylon locking nuts mainly used? Are they standard auto parts nuts?

A: Yes, hexagonal nylon locking nuts are typical automotive parts nuts and are widely used in key parts such as chassis suspension, engine periphery, gearbox, body structure, and seat fixation. Its excellent anti-vibration and anti-loosening properties meet the stringent requirements of the automotive industry for connection reliability.

 

Q: Can hexagonal nylon locking nuts be reused?

A: Can be reused. Nylon inserts have good elastic recovery capabilities and can maintain effective anti-loosening performance within the rated number of uses (generally 5-10 times). However, if the nylon ring is significantly deformed, aged or worn, it is recommended to replace it to ensure the anti-loosening effect.

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