3.5mm (No.6) x 9.5mm, flanged hex head self drilling screw (TEK), BZP, DIN 7504 K

Self-drilling screws to save time

Increase speed and efficiency with self-drilling screws. A drill-like tip allows the screw to create its own pilot hole. Combined with a self-tapping thread allows improved holding power and a tighter grip compared to traditional screws.

A Tek screw designed with a flanged hex head for installation with a range of standard tools.

This sees them widely used across many sectors by both professionals and DIY enthusiasts alike.

Manufactured from steel with a bright zinc plating (BZP) for a medium level of corrosion and conforms to DIN 7504 K standards.

An impressive combination that makes for a versatile screw when ease of installation, speed, and reliability are needed.

9.5mm self-drilling screw specification

• Thread Diameter (TD): 3.5mm
• Length (L): 9.5mm
• Head Width (H): 8.3mm x Head Height (HH): 3.45mm
• Drive Type: (DT): 5.5mm
• Material: Steel
• Finish: Bright zinc plated (BZP)
• Conforms: DIN 7504 K

Part of a growing range of self-drilling screws held in stock with various head types and bulk discounts across the range.

Note - Drill point wander is a possibility with the self-drilling screws, but this can be eliminated by using a very quick centre punch indent.

Frequently asked questions for flanged hex head self drilling screws

What self-drilling screws used for?

Hex flange self-drilling screws are designed for fastening thin sheet metal, light gauge steel, aluminium and similar materials without the need for a separate pilot hole. Their drill like tip cuts through the material before the thread forms a secure fixing.

Do self-drilling screws need a pilot hole?

No, self-drilling screws are designed with a hardened drill like point that drills its own hole while being driven into the material, so under normal conditions, a pilot hole is unnecessary.

What's the difference between a self-drilling screw and a self-tapping screw?

Although the names are often used interchangeably, they perform different functions.

• A self-drilling screw has a drill bit-shaped point that drills and taps the hole in one operation.
• A self-tapping screw requires a pre-drilled hole before cutting its own thread.

Can Bright Zinc Plated (BZP) TEK screws be used outdoors?

Bright Zinc Plated (BZP) screws offer a mid-level corrosion resistance for indoor applications and sheltered outdoor environments. For coastal locations, marine environments or permanently exposed installations, A2 or A4 stainless steel screws are required.

Why does my self-drilling screw wander when I start drilling?

Drill point wander can happen on smooth steel surfaces before the drill point bites into the material. A solution is to lightly centre punch the steel before driving the screw. This creates a small indentation that helps guide the drill point and produces a more accurate fixing.

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