Custom Steel Flat Slotted Cheese Head Shoulder Screw Knurled Knob Screws

Steel Tightening Metal Stamping Custom Ss304 Steel Solid Rivet

A screw is a type of fastener characterized by a helical ridge (called a thread) wrapped around a cylindrical shaft. Screws are used to hold objects together or to position them relative to one another. They are one of the most common and versatile fasteners, used in a wide range of applications, from household repairs to industrial machinery.

Key Components of a Screw

1. Head:

• The top part of the screw, designed to be driven by a tool (e.g., screwdriver, wrench, or drill).

• Common head types include flat, pan, round, hex, and Phillips.

2. Shank:

• The cylindrical body of the screw, which may be fully or partially threaded.

3. Threads:

• The helical ridges that wrap around the shank.

• Threads allow the screw to cut into or grip the material as it is turned.

4. Tip:

• The end of the screw, which may be pointed (for self-tapping screws) or blunt (for machine screws).

  
  

Types of Screws

Screws come in many types, each designed for specific applications:

1. Wood Screws:

• Designed for use in wood.

• Have coarse threads and a sharp point for easy insertion.

2. Machine Screws:

• Used with nuts or threaded holes in metal or plastic.

• Have uniform threads and are often smaller in size.

3. Self-Tapping Screws:

• Can cut their own threads into materials like metal or plastic.

• Commonly used in sheet metal and automotive applications.

4. Sheet Metal Screws:

• Designed for fastening thin metal sheets.

• Have sharp threads and a pointed tip.

5. Drywall Screws:

• Specifically for attaching drywall to wood or metal studs.

• Have a bugle head to avoid tearing the drywall paper.

6. Lag Screws (Lag Bolts):

• Heavy-duty screws used in wood construction.

• Require a pre-drilled hole and are driven with a wrench.

7. Socket Head Cap Screws:

• Used in machinery and precision applications.

• Have a cylindrical head with a hexagonal socket for driving.

8. Set Screws:

• Used to secure an object within or against another object (e.g., holding a pulley on a shaft).

• Often have no head and are driven with an Allen wrench.

9. Concrete Screws:

• Designed for use in concrete, brick, or block.

• Have special threads and often require a pre-drilled hole.

10. Thread-Cutting Screws:

• Create threads in pre-drilled holes in metal or plastic.

• Often used in automotive and electronics industries.