A screw is a mechanical part, a fastener with threads, usually consisting of a head and a screw. The screw has threads, and by rotating the screw, it can be screwed into the workpiece to achieve the function of fastening or connection. It is mainly used to connect, fix, or adjust two or more objects. Some screws (such as adjustment screws) can be used to adjust the position or gap of parts.

• GB12 Square Neck Screws are high-quality industrial fasteners designed for secure and reliable connections in demanding applications
• Feature a distinctive square section beneath the head that locks positively into corresponding square holes
• Prevents rotation during assembly and tightening, ensuring vibration-resistant and stable joints
• Manufactured to relevant GB (Chinese National Standard) specifications
• Square neck provides superior torque transmission compared to standard screws
• Ideal for assemblies requiring high clamping force where screw head rotation must be prevented

• Heavy-duty machinery and equipment
• Agricultural implements
• Automotive components and chassis assemblies
• Construction and structural metalwork
• Any application requiring a non-rotating fastener solution

Bolts are packed in neutral packaging boxes with standard quantities arranged in small cartons. Custom packaging configurations are available upon request. Small cartons are consolidated into larger master cartons for secure transportation. Palletized units are wrapped with waterproof film and reinforced with packaging straps, with custom shipping marks available.