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China Combination nut Manufacturer, Supplier, Factory

What Is a Combination Nut?

In industrial and mechanical applications, securing components reliably is paramount. A combination nut, often referred to as a hexagonal spring washer nut, is a specialized fastener engineered for superior performance. This innovative nut integrates a standard hexagonal nut with an attached spring washer, creating a single, efficient unit. The integrated hexagonal spring washer nut design eliminates the need for separate washers, streamlining assembly and reducing the risk of losing small parts. It is widely used in automotive, machinery, and construction where vibration resistance is critical. The locking mechanism of the hexagonal spring washer nut ensures a tight, secure fit that maintains tension under dynamic loads, preventing loosening over time and enhancing the overall safety and durability of the assembly.


Detailed Specifications of the Combination Nut

The Combination nut is manufactured to meet rigorous international standards, ensuring compatibility and reliability. Below are the detailed parameters that define our product's quality and performance.

Material and Finish Options

  • Material Grades: Carbon Steel (Grade 5, Grade 8), Stainless Steel (304, 316), Alloy Steel
  • Surface Finishes: Zinc Plated, Hot-Dip Galvanized, Dichromate, Plain
  • Corrosion Resistance: Excellent for Stainless Steel and plated finishes
  • Temperature Range: -50°C to +300°C, depending on material

Key Dimensional Parameters

Thread Size (UNC/UNF) Width Across Flats (mm) Height (mm) Washer Outer Diameter (mm) Proof Load (MPa)
1/4" - 20 11.0 8.5 16.0 580
5/16" - 18 14.0 10.5 20.0 600
3/8" - 16 17.0 12.5 24.0 620
1/2" - 13 22.0 16.0 30.0 655
5/8" - 11 27.0 20.0 38.0 690

Performance and Certification Standards

  • Standards Compliant: ISO 7042, DIN 985, ASTM A194
  • Hardness: 70-100 HRB for carbon steel; 25-35 HRC for alloy steel
  • Vibration Resistance: Exceeds requirements of Junker Vibration Test
  • Torque Specifications: Pre-load torque values available upon request for each size and material.

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