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Hex Self-Drilling Screws

A Self-Drilling Screw is a Self-Tapping Screw with the added feature of a drill point. The drill point looks a lot like the point of a drill. It will drill a hole and form the mating threads in one operation.

Hex Heads are available in different materials for use in a number of applications.

  1. Carbon Steel
  2. Stainless Steel AISI-304
  3. Stainless Steel AISI-316

Bi-Metal – SS-304 with Carbon Steel Drill point

Bi-Metal self-drilling tapping screws that provide the corrosion resistance of 300 series stainless steel and the efficiency of drill screws. Such screws avoid the shortcomings of each of these materials.

The whole screw is protected with a silver slide coat. This coating not only adds additional corrosion protection it also reduces the screw in resistance.

This screws can be used for up to two sheets of 1.00mm stainless steel (2.00mm total thickness). The hardened point cuts through the steel then the 304 screws are designed to last a long time without corrosion and can also be used with 316 sheet or cladding. This is a much better option than either a carbon steel screw or a 410 stainless screw that will be at risk of corrosion.

They are suitable for use in both steel and aluminum.

SS-304 A2/CV H4B46 – Download Datasheet
SS-316 A4/CV H6B46 – Download Datasheet

Stainless Steel AISI-410

FINISH/COATING

Zinc Electroplated

Class-3 Coating

Passivated

HEX HEAD WITH FLANGE

As per DIN-7504K

Use with EPDM washer for roofing to provide a leak-proof fixing.

DIN-7504K Self Drilling Screw Hex SS-304 A2 B4B43 – Download Datasheet
DIN-7504K Self Drilling Screw Hex SS-316 A4 B6B43 – Download Datasheet

Special Considerations

Flute Length – The length of the flute determines the thickness of the metal that the self-drilling screw can be used on. The flute is designed to extract the drilled material from the hole.

If the flute gets blocked, the cutting will stop. Simply put, if you are attaching thick pieces of material together then you will require a self-drilling screw with a flute to match. If the flute becomes blocked and no action it taken to clear the same, the drill point is likely to overheat and fail.

Drill-Point Material is generally plain carbon steel which is less stable at high temperatures than equivalent high-speed steel (HSS) drill-bits. To reduce wear on the drill point, fasten using a drill motor rather than an impact driver or hammer drill.

High Temperature Stability affects how quickly the drill point fails due to the heat generated by the drilling operation. Refer to the troubleshooting guide at the end of this section for some visual examples.

Drilling Temperature is directly proportional to motor RPM, applied force, and work material hardness. As each value increases, so does the heat generated by the drilling operation.

Reducing Applied Force can increase durability and allow the drill point to penetrate thicker materials (i.e., remove more material before failing due to heat buildup).

Reducing Motor RPM can improve performance in harder materials by allowing the user to push harder during the drilling process and extending the life of the drill point.

CORRECT SETTING OF SCREWS FOR ROOFING.

Self Drilling Screws with sealing washers (EPDM Washers) should be tightened
only until the washer is depressed firmly enough to provide a weathertight seal.

The Self Drilling Screw should not be over-tightened because this may split the sealing
washer or deform the sheet, either of which could lead to water penetration.

You should take particular care when valley fixing because there is no flexibility with
the sheet as it is hard against its support.

Take particular care to ensure the fastener is driven perpendicular to the sheeting to
avoid deformation of the washer


CAUTION – It is a common error in assuming that Stainless Steel Self Drilling Screws will drill into steel. However, that is not the case. To provide corrosion resistance, stainless steel self-drill screws are made from AISI-304 or AISI-316 grades. These cannot be hardened and therefore the drill point can only drill into softer materials like Aluminium.


Troubleshooting guide

Failure Type Cause of failure
Flutes chipped
Excess force used when driving the screw in
No drilled hole
Material too hard
Driver set to reverse
Blunt drill point due to handling or a manufacturer defect
Flute melted
Material too hard

Too high RPMs used

Melted point
Material too hard

Excess force used

Drill bit split
Excess force used when driving the screw in
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