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Self Tapping Screws

Self Tapping Screws

What are Self Tapping Screws ?

Self Tapping Screws, often simply called 'Self Tappers', are part of Accu's extensive range of Drilling and Tapping Fasteners. A Self Tapping Screw is specially designed to create its own threads within a pre-drilled hole.

It is strongly recommend you use a pilot hole before attempting to install this type of screw, however if you are looking for a screw to create the hole itself & tap its own thread, we offer a range of Self Drilling Screws.

Self Tapping Screws are available in a wide variety of head types, drive types and thread types which help maximize application performance depending on the material you will be screwing into.

What Is The Difference Between Self Tapping And Self Drilling Screws?

In layman terms, tapping means creating a thread. Tapping is not the act of creating a hole. In soft materials, such as softwood or non-rigid plastic, there is some overlap in these processes, as the sharp tip is usually sufficient to create the hole required. With metals or hardwoods, a pilot hole must be drilled before a thread can be tapped. Failure to do so has a high chance of causing cracks in the base material or failure of the screws themselves.

Self Tapping Screws For Plastic

Certain types of Self Tapping Screws have been specially designed for use with plastics such as PLA (commonly used in 3d printing), HDPE, LDPE, PS, polycarbonate, PVC, PETG, Nylon & ABS. While regular Self Tappers are suitable for use with most soft plastics, there is an increased likelihood of cracking the base plastic particularly when the material is very stiff (e.g. polycarbonate, PLA).

Polyfix Screws are specifically intended for fastening into plastics as they feature more pronounced, sharper threads, which cause less stress when inserting the screw and mean increased resistance to pull-out and stripping within low-density plastics.

Thread Types

AB Type Threads

AB threads are the most common Self Tapping Screw within Accu's range. An AB Type thread is characterised by its spaced threads and sharply pointed tip, sometimes called a gimlet point. The tip of these fasteners aids the self-tapping characteristics of the screw, making AB self tappers highly versatile and suitable for most applications.

B Type Threads

B threads, previously known as type Z threads, are self-tapping threads with a blunt tip. This type of self tapping fastener is generally used in conjunction with blind holes, or in applications where sharp components are unsuitable.

Imperial Self Tapping Screws

Self Tapping Screws are all manufactured in imperial sizes as standard. Metric conversions are listed on each individual product page, and for a full list of conversions please see our Self Tapping Thread Gauge Conversion Table.

Bespoke Self Tapping Screws Manufacture

High precision, bespoke manufacture of Self Tapping Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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