Countersunk Head Bolts with Square Necks: Superior Fastening Solutions

When it comes to secure and flush fastening in demanding applications, Countersunk Head Bolts with Square Necks stand out for their reliability and strength. These bolts are designed to sit perfectly flush with the material surface, providing a smooth finish ideal for machinery, construction, and automotive industries. Unlike some alternatives, such as Plain Finish Round Head Bolts, which offer a different aesthetic and functional profile, our countersunk head bolts ensure no protrusion, reducing the risk of snagging and enhancing safety. The square neck feature prevents rotation during installation, making them a preferred choice for high-vibration environments. For applications requiring robust fastening without surface interference, these bolts deliver unparalleled performance. Additionally, similar products like Plain Finish Round Head Bolts may suit less demanding scenarios, but our specialized design caters to precision and durability.


Countersunk Head Bolts with Square Necks are engineered to meet rigorous industry standards, offering exceptional load distribution and resistance to loosening. These bolts are commonly used in woodworking, metal fabrication, and assembly lines where a seamless appearance is critical. The square neck locks securely into the material, eliminating the need for additional tools to hold the bolt in place during tightening. This design not only speeds up installation but also reduces labor costs and improves overall efficiency. With Countersunk Head Bolts with Square Necks, you can trust in a product that combines form and function, ensuring long-term reliability in even the toughest conditions. Whether for new projects or maintenance, these bolts provide a dependable solution that professionals rely on daily.

Key Product Parameters

Our Countersunk Head Bolts with Square Necks come in various specifications to suit diverse needs. Below is a list of common features:

  • Material: High-strength steel, stainless steel, or alloy options
  • Head Type: Countersunk with 82-degree or 90-degree angles
  • Neck Design: Square undercut for anti-rotation
  • Finish: Zinc-plated, hot-dip galvanized, or plain finish
  • Thread Type: Fully threaded or partially threaded designs
  • Standards: Compliant with ANSI, DIN, or ISO specifications

For detailed dimensions, refer to the table below:

Size (Inches) Thread Pitch Head Diameter (mm) Square Neck Width (mm) Length Range (mm) Typical Applications
1/4" 20 TPI 12.7 6.35 20-100 Light machinery, furniture
5/16" 18 TPI 15.9 7.94 25-150 Automotive frames, structural assemblies
3/8" 16 TPI 19.1 9.53 30-200 Heavy-duty equipment, construction
1/2" 13 TPI 25.4 12.7 50-300 Industrial machinery, bridges

Custom sizes and materials are available upon request to meet specific project requirements.

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