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Self-tapping screws are a type of fastener with a unique feature. They work by tapping their own threads in materials like plastic, wood, and metal. Self-tapping screws are split into two main categories, Thread-Forming and Thread-Cutting. The screws are similar in the job they do; however, they have two differences. One of the screws has a flat base, the other has a sharp point.

The difference between self-tapping and self-drilling fasteners is that self-tapping screws will tap a hole into a soft material, self-drilling screws can drill a hole into anything from metal to wood meaning no pilot hole is needed. You can find out more in our [self-tapping screws guide](/web/content/discovery/ideas-and-advice/self-tapping-screws-guide).

### Thread-Forming Screw

Before using this self-tapping screw, it is recommended that a pilot hole is drilled into the material. As thread-forming screws have a flat nose, it makes the drilling process easier and is used when fastening plastic together.

### Thread-Cutting Screw

This self-tapping screw does not require any preparation. As it has a pointed tip, it is not necessary to create a pre-drilled pilot hole. Thread-cutting screws can pierce a small entry hole while being driven into the material the thread is being created.

Self-tapping screws are used where an application requires regular maintenance and regular easy access. These screws are useful in situations where products must be assembled and disassembled, such as access panels or even furniture.

### What self-tapping fasteners are available?

When choosing the best self-tapper for your job, there are a few key points to consider e.g. the right head shape, drive type, and thread size are essential. Another factor would be the material the screws are used with, and the environment and elements they are exposed to.

As a screwdriver is the only real tool used when working with self-tappers, make sure that you have the screwdriver with the appropriate drive type.

**Drive Types**

- Crosshead
- Hexagon Head
- Pozi
- Torx

**Head Shapes**

- Pan Head
- Countersunk
- Button Head

### Materials and Finishes
- Steel
- Stainless Steel
- Bright Zinc Plated
- Clear Passivated


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Pan Head Self Tapping Screws | RS

<p>Pan head Self-tapping screws are a type of fastener that requires no pre-drilling. Pan head self-tappers work by tapping their own threads in materials like plastic, wood, and metal.</p><h2>What is a pan head screw?</h2><p>A pan head screw looks a little bit like an upside-down frying pan. It has a wide head and a flat bearing surface and is rounded on the sides. Pan head screws usually have a slotted, cross, or Posidriv drive for installation.</p><h3>Thread Types</h3><p>Pan head self-tapping screws are available with standard metric threads including M3, M4, and M5. Alternatively, UTS (Unified Thread Standard) are also available including 4, 6, 8, 10, and size threads.</p><h3>Materials and Finishes</h3><p>Typically made from steel or stainless steel (A2)304 or (A4) 316 grades. Finishes can be bright zinc plated, clear passivated for extra protection from the elements.</p>

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Stainless Steel Self Tapping Screws | RS

<p>Self-tapping screws are a type of fastener with a unique feature. They work by tapping their own threads in materials like plastic, wood, and metal.</p><p>We offer a range of high-quality stainless steel self-tapping screws in A2 (302) stainless steel and A4 (316) marine-grade stainless steel.</p><h2>What is the difference between A2 and A4 Grade?</h2><p>A2 stainless steel is often called 304 grade or 18/8 stainless. The 18/8 is in reference to the amount of chromium and nickel in the material. 18% chromium and 8% nickel. A2 stainless steel is the most common type of stainless steel and is suitable for general use.</p><p>A4 stainless steel is often called 316 marine-grade, or 18/10 stainless. As above the 18/10 refers to the chromium and nickel content. 18% chromium and 10% nickel.</p><p>A4 stainless steel is usually more expensive as it has a higher tolerance to chemical exposure.</p><h3>Thread Types</h3><p>Stainless Steel self-tapping screws are available with UTS (Unified Thread Standard) including 4, 6, 8, 10, and size threads.</p><h3>Drive Types</h3><p>Our stainless steel fixings come in the popular crosshead or Pozidriv drives.</p>

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Countersunk Self Tapping Screws | RS

<p>Countersunk Self-tapping screws are a type of fastener that requires no pre-drilling. Countersunk self-tappers work by tapping their own threads in materials like plastic, wood, and metal.</p><h2>What is a countersunk screw?</h2><p>Also known as a flat head screw, a countersunk screw is designed to sit flush with the object or material that it is inserted into. The head on a countersunk screw is flat that gradually tapers down the shaft of the screw. When the screw is inserted into the material it will sink in and sit flush.</p><h3>Thread Types</h3><p>Countersunk self-tapping screws are available with standard metric threads including M3, M4, and M5. Alternatively, UTS (Unified Thread Standard) are also available including 4, 6, 8, 10, and 12 size threads.</p><h3>Materials and Finishes</h3><p>Typically made from steel or stainless steel 304 or 316 grades. Finishes can be bright zinc plated, clear passivated for extra protection from the elements.</p>

Pan Head Self Tapping Screws

What is a pan head screw?

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