Self Tapping Screws
Self-tapping screws are different to traditional screws as they tap their own threads when screwed into either plastic, wood or metal.We have an extensive range of self-tapping screws suitable for many situations.
Self-tapping screws are commonly used when you need to attach two pieces of material together where you can only access one side of the material. Where you can access both sides you can use either a screw or a bolt.
Self-tapping screws are useful where you have to disassemble and reassemble products such as furniture, as self-tapping screws will relocate themselves into the same threads which they have been removed from.
The various types include the following:
Slotted Self-Tapping Screws
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Slotted PAN as per DIN 7971
- MS-Zinc Plated
- SS-304 A2
- SS-316 A4
Slotted CSK as per DIN 797
- MS Zinc Plated
- SS-304 A2
- SS-316 A4
Phillips(Cross Recessed) Self-tapping
Pan Phillips as per DIN 7981
- MS Zinc Plated
- SS-304 A2
- SS-316 A4
CSK Phillips as per DIN 7982
- MS Zinc Plated
- AISI-304 A2
- AISI-316 A4
TORX Drive Self-Tapping Screws
The hexalobular socket screw drive, known as Torx or star drive, uses a star-shaped recess in the fastener with six rounded points. It is a reliable method of fixing screws. This drive can take more torque and does not slip.
TORX PAN as per ISO 14585
- SS-304 A2
- SS-316 A4
TORX CSK as per ISO 14586
- SS-304 A2
- SS-316 A4
Chipboard screws
These have threads different from the above Self-Tapping types. Chipboard screws have deeper threads with a wider pitch and are specially designed for driving into wood.
They are created to fasten low, medium and high density chipboard.
- Countersunk
- PAN Head
- MS and SS
- Phillips and TORX Drive
Drywall screws (Gypboard screws).
These screws normally have a bugle head.
The bugle head screw features a countersunk head with a flat top and a concave bearing face. The shape of the bugle head allows distribution of the stress over a much wider area than is possible with a flat head screw.
These screws are primarily used to attach plaster board to wood to metal studs.
PT Screws
We have added PT screws – Self-Tapping Screws suitable for both plastics and metal.
With a blunt type F end, these are extremely versatile for small and mini assemblies of a number of different materials.
Made from corrosion resistant stainless steel AISI-304 these screws are RoHS compliant.
The CSK Phillips head offers fixings with a flush and level finish without any projection.
The PAN head screws are very useful for higher clamping loads and available from 1.2mm onwards.
Usage Guide
Thread Length : Always choose a fastener with sufficient threads to fully engage in the base metal.
Pilot Hole : Trials are recommended to establish the optimum pilot hole diameter. Because conditions vary widely, it may be necessary to vary the hole size to suit a particular application. Guidance chart below. Dimensions is mm.
| DIA d (Size) | ST2.2 | ST2.9 | ST3.5 | ST(3.9) | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| ISO Size | #2 | #4 | #6 | (#7) | #8 | #10 | #12 | #14 |
| Pilot Hole Dia | 1.65 ~ 1.95 | 2.10 ~ 2.60 | 2.40 ~ 3.20 | 2.80 ~ 3.55 | 3.0 ~ 3.80 | 3.50 ~ 4.50 | 4.20 ~ 5.10 | 4.90 ~ 6.00 |
Material Combinations : Using Stainless Steel Self-Tapping Screws on Stainless Steel Sheets may lead to Galling and care is advised.
