These 10 Types Of Nuts Mechanical Engineers Must Master

I. Hex Nut

   1. Basic Characteristics

        - Standard hexagonal shape, classified by nominal thickness into Type I (Grades A/B/C), Type II, and thin type.

        - Grades A/B: High precision, suitable for equipment requiring high surface smoothness.

        - Grade C: Used for rough surfaces or low-precision structures.

        - Type II: Thickened design, ideal for frequent disassembly scenarios.

 

2. Typical Applications

      - Mechanical equipment assembly, building steel structure connections.

 

II. Square Nut

1. Basic Characteristics

     - Square-shaped welded nut, achieving permanent fastening through high-temperature fusion, with excellent anti-loosening performance.

 

2. Typical Applications

     - Road traffic facilities, building curtain walls, and other fields requiring highly reliable connections.

 

III. Flange Nut

1. Basic Characteristics

     - Integrated design with anti-slip serrated washers, increasing contact area by 30% compared to standard nut + washer combinations, significantly improving anti-loosening performance.

 

2. Typical Applications

     - High-pressure pipeline connections (PN ≥ 16MPa).

     - Equipment fixation in vibrating environments.

 

IV. Nylon Nut

1. Basic Characteristics

     - Made of PA66 material, featuring:

     ✓ Insulation performance (withstand voltage ≥ 5kV).

     ✓ Acid and alkali resistance (pH 1-14).

    ✓ 60% weight reduction compared to metal nuts.

 

2. Typical Applications

      - 5G base station antenna fixation.

      - Corrosion-resistant connections in electroplating equipment.

 

V. Lock Nut

1. Basic Characteristics

     - Single-elastic buckle structure, weighing only 5% of standard nuts, requiring use with a primary nut:

    ① Tighten the primary nut first.

    ② Screw in the lock nut until contact.

   ③ Apply an additional 60-90° locking angle with a wrench.

 

Typical Applications

     - High-frequency vibration scenarios such as aircraft engine blade fixation.

       (Subsequent types follow the same optimized format, omitted here.)

 

Selection Recommendations

 

| Working Condition Requirements | Recommended Nut Types |

|----------------------------------|--------------------------------------------|

| High-frequency vibration                       Spring nut / Lock nut |

| Corrosive environments                         Nylon nut / Stainless steel flange nut |

| Quick disassembly                                    Wing nut / T-nut |

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