12.9 Grade 1/4-28 UNF Screw US Imperial Fine Thread Headless Spherical Cylindrical End Machine Screw

Core Features & Benefits

• 12.9 Grade High-Strength Alloy Steel: Crafted from premium 12.9 grade alloy steel, this screw boasts exceptional tensile and shear strength, ranking among the top industrial fastener grades. It resists deformation and fatigue even under heavy loads and high stress, ensuring long-term durability in critical applications.
• 1/4-28 UNF US Imperial Fine Thread: Adheres strictly to US imperial 1/4-28 UNF fine thread standards, offering superior vibration resistance and precise locking compared to coarse threads. It seamlessly fits US imperial nuts, taps, and fixtures, making it ideal for precision assemblies that require stable, non-loosening fastening.
• Headless Spherical Cylindrical End Design: The headless construction enables flush, concealed installation without protrusions, preserving surface flatness and aesthetics. The spherical cylindrical end enhances contact with workpieces, distributing pressure evenly to reduce wear and improve clamping stability.
• Precision-Machined for Smooth Installation: Each screw undergoes precision machining to ensure consistent thread accuracy and a smooth spherical end. This allows for effortless insertion and secure tightening, even in confined spaces, while minimizing damage to workpieces during assembly.
• Versatile Industrial Applications: Perfect for automotive engineering, heavy machinery, CNC equipment, precision instruments, and industrial maintenance. It caters to professionals seeking US imperial fasteners that balance high strength, space-saving design, and reliable performance.

Specifications