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J C Gupta & Sons

J C Gupta & Sons

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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

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
Go to the Slotted Self Tapping Screws Page

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
Go to the Phillip Self Tapping Screws Page

Hex head self-tapping as per DIN 7976

MS-Zinc Plated
SS-304 A2 and SS-316 A4
Go to the Hex Self Tapping Screws Page

Socket Head Cap Screw Self-Tapping

We have self tapping screws available with a SHCS head as per DIN 912.

Socket caps have a small cylindrical head with tall vertical sides. Allen (hex socket) drive is a six-sided recess [Internal Hex Socket] for use with an Allen wrench (hex key). This design is the workhorse of the machine building industry. 

Available in SS-304 A2
Go to the Socket Head Self Tapping Screws Page

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
Download Datasheet

TORX CSK as per ISO 14586

SS-304 A2
SS-316 A4
Download Datasheet
Go to the Torx Self Tapping Screws Page

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
Go to the Chipboard Screws Page

Hex Coach screws as per DIN 571

This type of screw has wider threads and suitable for wood construction.

These are heavy duty screws designed with a square or hexagonal head engineered to be used with a wrench, spanner, or pliers.

Go to the Hex Coach Screws Page


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.

Go to the Drywall Screws Page


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.

These are available with different head designs.

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.

Made from corrosion resistant stainless steel AISI-304 these screws are RoHS compliant.

Go to the PT Screws Page

 


JCPlas Thread Forming Screws for Plastics

If your usage is in plastics consider the JCPlas thread forming screws for plastics.

Go to the JCPlas Thread Forming Screws for Plastics page

Range starts from 1.6mm 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.

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