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FIREFLY Concrete Screw - 70mm (Pack of 50)

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23 in stockFIREFLY® Concrete Screw 70mm

FIREFLY Concrete Screw - 70mm (Pack of 50)

The FIREFLY® Concrete Screw (70mm) is a heavy-duty masonry fixing designed to anchor 41mm x 41mm metal channels directly to concrete substrates. Supplied in a pack of 50, these screws provide a high-strength, non-expansion connection essential for the structural stability of fire barrier frameworks.

  • Direct fixing technology: Cuts its own thread into C20/C25 concrete, eliminating the need for plastic plugs or expansion anchors.
  • High load capacity: Engineered to withstand the weight and tension of the steel framework, ensuring the fire protection system remains secure.
  • Optimised embedment: The 70mm length allows for the 41mm channel depth plus the required penetration into the concrete for a maximum hold.

Product Code: FYCS001

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Orders placed today will be dispatched on Monday**Applies to UK mainland customers only - find out more delivery information

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Description

Specifications

FAQs

Description

Professional Application & Performance

Anchoring the primary support grid to a concrete structure (such as a soffit or wall) requires a fixing that is both fast to install and incredibly secure. The FIREFLY® Concrete Screw simplifies this process. After drilling a 5mm pilot hole in the substrate, this screw can be driven directly through the channel. The thread design cuts into the masonry, creating a positive mechanical interlock that resists vibration and fire-induced stress better than traditional friction anchors.

Compliance and Installation

When installing a FIREFLY® system, the substrate fixing is the foundation of the entire passive fire protection assembly. These screws are specifically tested for use with C20 and C25 concrete grades. Using the specified 5mm pilot hole ensures the correct torque and grip are achieved, preventing installation failures and ensuring the grid remains rigid during inspection and service.

Key Specifications

  • Product: FIREFLY® Concrete Screw
  • Pack Size: 50
  • Length: 70mm
  • Substrate: C20/C25 Concrete
  • Pilot Hole Diameter: 5mm (in concrete)
  • Clearance Hole: 7mm (in fixture/channel)

This product is required for the installation of 41mm x 41mm channel to concrete substrates.

Specs

  • Length: 70mm
  • Substrate: C20/C25 Concrete
  • Head Type: Pancake (Flat / Low Profile)
  • Pilot Hole: 5mm (in concrete)
  • Quantity: 50
  • Brand: Firefly

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