4.2mm (No.8) x 50mm, flanged hex head self drilling screw (TEK), BZP, DIN 7504 K

50mm self-drilling tek screws

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.

50mm self-drilling screw specification

• Thread Diameter (TD): 4.2mm
• Length (L): 50mm
• Head Width (H): 8.8mm x Head Height (HH): 4.25mm
• Drive Type: (DT): 7mm
• Material: Steel
• Finish: Bright zinc plated (BZP)
• Conforms: DIN 7504 K

Part of a growing range of flanged self-drilling screws at various lengths held in stock.

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?

The hex flange self-drilling screws are designed for use on thin sheet metal without the need for drilling a separate pilot hole. Their unique drill like tip cuts through the material making installation quicker than if a pre drilled hole was needed.

Do self-drilling screws need a pilot hole?

In general no, the self-drilling screws are designed with a unique drill like point that drills its own hole when driven into the material. On occasions the drill bit can wander on the smooth material so it might be beneficial to use a quick centre punch indentation.

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

• A self-drilling screw has a drill bit shaped point that drills its own hole during installation, eliminating the need for pre-drilling.
• 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 prolonged external use A2 stainless steel is recommended

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

Drill point wander can happen with self-drilling screws on smooth steel surfaces before the drill point bites into the material. Using a centre punch creates a small indentation that helps guide the drill point when it initially starts.

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