Screw

A CSK bolt, also known as a countersunk bolt, is a type of fastener characterized by its flat head with a conical shape that tapers down to the threaded shaft. The conical shape of the head allows it to be flush with or slightly below the surface of the material it is fastened into when fully tightened, providing a smooth and even finish.

CSK bolts are commonly used in applications where a flush or recessed fastening is desired to avoid obstruction or to create a streamlined appearance. They are often used in woodworking, metalworking, and construction projects, as well as in furniture assembly and automotive applications.

The term "CSK" stands for "countersunk," which refers to the shape of the head. These bolts may have various drive types, such as slotted, Phillips, or hexagonal, and are available in different materials and finishes to suit specific application requirements.

When using CSK bolts, it's important to ensure that the countersink hole is properly sized and shaped to accommodate the head of the bolt for a secure and flush fit.

A shoulder screw, also known as a shoulder bolt or stripper bolt, is a type of fastener that has a cylindrical shoulder section between the head and the threaded portion. The shoulder portion is larger in diameter than the threaded section, creating a smooth transition between the two sections.

These screws are designed to provide a precise and stable pivot or bearing surface in mechanical assemblies. The shoulder serves as a precise stop surface or bearing surface, allowing the screw to rotate while maintaining alignment and providing support for the components being fastened.

Shoulder screws are commonly used in applications where precise alignment, smooth movement, or load-bearing capabilities are required. They are often used in machinery, equipment, jigs, and fixtures where frequent assembly and disassembly are needed.

Shoulder screws come in various sizes, materials, and configurations to suit different applications and load requirements. They may have various head styles, such as socket head, slotted head, or hex head, depending on the specific application's needs.

Pan Phillips screws are a common type of screw characterized by a rounded, slightly dome-shaped head and a Phillips drive recess. The Phillips drive features a cross-shaped indentation that allows a Phillips screwdriver to engage and turn the screw. This design provides greater torque transmission and minimizes slippage compared to slotted screws, making them easier to drive and less prone to cam out.

The term "pan" refers to the shape of the head, which is rounded and slightly convex, resembling the bottom of a pan. This shape allows the screw to sit flush or slightly below the surface when driven into a material, providing a neat and finished appearance.

Pan Phillips screws are widely used in various applications, including woodworking, furniture assembly, electronics, automotive, and general construction. They come in a range of sizes, materials, and finishes to suit different requirements and are compatible with Phillips screwdrivers of corresponding size. Their versatility, ease of use, and reliability make them a popular choice for many fastening tasks