Overview:

This product category refers to standard hexagonal nuts and accompanying hexagonal head bolts manufactured from stainless steel, conforming to ISO 4032 (Hexagon nuts, style 1 — Product grades A and B) and UNI 5588 standards.

Key Components:

• Hex Head Bolts: Bolts with a hexagonal head, designed to be driven by a wrench or socket. They are used to fasten objects together, often in conjunction with a corresponding nut.
• Hex Nuts: Six-sided nuts designed to mate with threaded bolts, providing a clamping force to secure components. Conforming to ISO 4032/UNI 5588 ensures specific dimensions, tolerances, and mechanical properties for optimal performance.

Material Specifications:

• Stainless Steel A2 (AISI 304):
  • Commonly known as SS304.
  • Offers good corrosion resistance, particularly to atmospheric corrosion, foods, sterilizing solutions, and many organic and inorganic chemicals.
  • Excellent for general-purpose use, widely employed in food processing equipment, chemical process equipment, and architectural applications.
  • Non-magnetic in the annealed condition.
• Stainless Steel A4 (AISI 316):
  • Commonly known as SS316.
  • Provides superior corrosion resistance compared to A2 (304), especially in chloride environments (e.g., saltwater, marine applications, chlorinated solutions) due to the addition of molybdenum.
  • Ideal for marine environments, chemical industries, pharmaceutical equipment, and applications requiring enhanced resistance to pitting and crevice corrosion.
  • Non-magnetic in the annealed condition.

Standards Compliance:

• ISO 4032: Specifies the characteristics of hexagon nuts, style 1, with threads from M1,6 to M64 inclusive, and product grades A and B. It ensures dimensional consistency, strength, and material properties.
• UNI 5588: An Italian national standard that is technically equivalent to ISO 4032 for hexagon nuts, and often referenced for associated bolts.

Typical Applications:

• Construction: Structural connections, facades, handrails, and general fastening where good corrosion resistance is required.
• Marine and Coastal: Fasteners for boats, docks, offshore platforms, and structures exposed to saltwater (A4/SS316 preferred).
• Chemical and Petrochemical: Equipment and pipework where exposure to corrosive chemicals is a concern.
• Food and Beverage Industry: Machinery, tanks, and processing equipment due to inertness and ease of cleaning.
• Automotive and Transportation: Various assembly applications where corrosion resistance and strength are important.
• General Engineering: Machine building, assembly of components, and various industrial applications.

Advantages:

• Corrosion Resistance: Excellent protection against rust and various corrosive agents, especially with A4/SS316 in harsh environments.
• Durability: High strength and long service life.
• Hygienic Properties: Suitable for applications requiring cleanliness and sterilization (e.g., food, medical).
• Aesthetic Appeal: Stainless steel maintains a bright, clean appearance.
• Standardized: Conforming to ISO and UNI standards ensures interchangeability and reliable performance.