Reliable Cup Head Bolt for Industrial Applications and Fastening Needs

• Customization: Available
• Material: Stainless Steel
• Type: Round Head
• Model NO.: 1-1
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN
• Grade: 4.8
• Application: Building
• Use: Fastening Connection
• Thread Type: Full Thread
• Applicable Industries: Construction, Manufacturing
• After-Sales: Three Months
• Transport Package: Container
• Specification: 1-100
• Trademark: Huilin
• Origin: Handan, Hebei
• HS Code: 0101101010
• Production Capacity: 50000

Product Description

Cup head hexagon screws, often revered as cylindrical head hex screws, are essential mechanical fasteners. Below, we delve into an elaborate depiction of these indispensable components:

1, Appearance and Structure

• Head shape: With a cylindrical design, the head of the hexagonal screw inside a cup head features a precisely engineered hexagonal hole at its apex, seamlessly accommodating a hex wrench for effortless and secure installation.

Side design: The slight curvature on the screw head's side not only enhances the aesthetic appeal, creating a smoother profile, but also provides a superior grip and feel during installation.

Internal hexagonal hole: Designed with precision, the depth of the internal hexagonal hole is in perfect harmony with the head's height. This design ensures the wrench fits snugly and securely, minimizing the risk of slippage during application.

2, Dimensions and Specifications

Head size: Typically, the head diameter of cup head screws exceeds the thread diameter by 2-3 millimeters, a thoughtful design that significantly reduces tool slippage risks during installation. The head height ideally ranges from 0.6 to 1 times the thread diameter, ensuring robust stability.

Thread specifications: These screws adhere to global standards, available in metric or imperial systems. For instance, a metric thread M6 × 1.0 indicates a 6mm diameter with 1mm pitch. British standards like 1/4"-20 denote a 1/4 inch diameter featuring 20 threads per inch.

Common specifications: Metric dimensions span from M3 to M20 with lengths from 5mm to 200mm. For imperial options, various specifications are available, offering versatility for different applications.

3, Material and Strength

Material selection: The hexagonal screws within the cup head are crafted from a variety of superior materials, such as carbon steel, stainless steel (e.g., 304, 316), and alloy steel (e.g., SCM435), each imparting distinct advantages.

Carbon steel: Known for its affordability, carbon steel offers reasonable performance in everyday environments but has limited rust resistance.

Stainless steel: Renowned for exceptional corrosion resistance, stainless steel is ideal for damp or chemical-prone environments, though it has slightly reduced strength.

Alloy steel: Post heat treatment, it achieves remarkable strength, making it a staple in the automotive and heavy industries.

• Strength grade: Screws are classified by strength grades such as 8.8 (tensile strength 800MPa, yield strength 640MPa) or 12.9 grade (tensile strength 1200MPa). Elevated strength levels signify enhanced load-bearing capabilities.

4, Surface Treatment

Common surface treatments include galvanizing (electroplating, hot-dip plating), blackening, Dacromet coating, and nickel plating, each providing distinct protective and aesthetic benefits.

Galvanized: Electroplated in a sleek silver-white with a 5-8 micron thickness, while hot dip coating, in a robust gray-white of 20-30 microns, delivers superior rust resistance despite a coarser finish.

Blackening treatment: This method produces a black oxide film through high-temperature oxidation, offering cost-effective, moderate rust prevention.

Dacromet coating: This gray finish withstands over 500 hours of salt spray, making it ideal for maritime applications.

Nickel plating: Provides a dazzling silver luster, optimizing both rust prevention and wear resistance, making it perfect for precision equipment.

5, Application

Application scenarios: Hexagonal screws inside cup heads excel in environments demanding high clamping force or confined spaces. They are integral to sectors like mechanical manufacturing, electronic devices, automotive, marine, aerospace, and beyond.