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Self-drilling screw mushroom head BTT

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


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.
Product overview

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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

Further specifications:

  • Metal profile fittings
  • Metal facades
  • Fittings

Areas of application:

  • Metal sheet

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