Self-drilling screw mushroom head BTT

Self-drilling screw wider head and SIT recess for easier screwing

Product overview

CELO's self-drilling screw BTT mushroom head and SIT recess which brings a perfect fit between recess and screw for easy screwing. The SIT recess allows a perfect transmission of the tightening torque. Its conical inner shape centers the screwing and keeps the screw fixed to the recess, facilitating its installation. Made of high-quality steel and stainless steel with blue zinc plated and aluminium zinc flakes which resist 480 HNS.

The wider head allows the screw to cover oversized holes. The 4.8 mm diameter has an unthreaded part under the head to absorb plate expansion.

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Reference

Head diameter [mm]

Head height [mm]

Packaging units

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Reference

94213BTT

94216BTT

94219BTT

94225BTT

94819BTT

9K44819BTT

94825BTT

9K44825BTT

9X4825BTT

Diameter [mm]

4.2

4.8

Length [mm]

Screw material

Steel

Head diameter [mm]

Head height [mm]

2.35

2.6

2.35

2.6

3.1

Point type

Selfdrilling

Suitable for

Metal sheet assembly

Packaging units

500

250

500

Packaging type.

Box

9 / 9 references are shown

Applications

Metal profile fittings
Metal facades
Fittings

Further specifications

Key features:

This oversized hole allows the expansion of the plate absorbing any dilation
The SIT recess allows a perfect power transfer to the screw thanks to the conial form

Base materials:

Metal sheet

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