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Type GF Grate-Fast™

A high strength floor fixing for securing rectangular open bar grating to the supporting steelwork without the need for on-site drilling or welding.

View technical specification


The Type GF Grate-Fast fixing eliminates the need for costly scaffolding or elevated floors as access to the underside of the flooring is not required. Installation is carried out quickly and safely from above, often by one person, significantly reducing costs. The malleable iron cast body along with the unique stepped clamping face, which locks under the steelwork, provides outstanding clamping force and a secure connection.

Features & Benefits

  • Superior clamping force from the cast body.
  • Lloyd’s Register Type Approval for resistance to shock and vibration.
  • Pre-assembled fixing for quick and easy installation.
  • Designed for pedestrian walkways only.
  • Not suitable for tapered flanges.


Click on an approval logo to download the certificate or report.


  • Material:

    • Top Hat: 
        ◦ Stainless steel grade 304 (GF08 only).
        ◦ Mild Steel, hot dip galvanised (GF10HDG & GF210HDG only).
    • Body: 
        ◦ Malleable iron, Sheraplex (GF08 only).
        ◦ Malleable iron, hot dip galvanised (GF10HDG & GF210HDG only).

  • Reaction to fire: A1 (Steel)

Durability and corrosion protection:

Corrosivity Class Galvanised Steel Electroplated Steel
C1 More than 50 years More than 20 years
C2 More than 50 years More than 5 years
C3 More than 20 years Not suitable

For C4 and C5 corrosion categories contact us.

Technical Specification

Click to view labelled diagram

Product Code Bolt 8.8 Flange Grating Bar Depth Grating Bar Width Bar Distance Tightening Torque Across Flats
mm mm mm mm mm mm
GF081) M8 3 - 19 22 - 38 5 - 10 19 - 48 5 6
GF10HDG2) M10 3 - 19 20 - 50 3 - 7 25 - 45 11 10
GF210HDG2) M10 3 - 19 19 -40 3 - 6.5 30 11 10

1) Supplied with socket head cap screw.

2) Supplied with hex head screw.

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.014 

Faster to Install

No drilling or welding!

Independently Approved

Reasons to choose Lindapter

  • Save time and money

    Save time and money

    Clamping two steel sections together avoids time-consuming welding or conventional drilling and bolting.

  • Safer connections

    Safer connections

    On-site drilling and welding is avoided, removing the need for hot work permits and encouraging safer site conditions.

  • High strength

    High strength

    Lindapter clamps are manufactured from high strength materials to resist high load requirements and harsh environments.

  • Industry leading approvals

    Industry leading approvals

    Lindapter has earned a reputation synonymous with safety and reliability, gaining multiple independent approvals.

  • Adjustable


    Quickly align steel sections by sliding the section into the correct position before tightening the Girder Clamp to complete the installation.

  • Free connection design

    Free connection design

    Lindapter’s experienced Engineers can design a bespoke connection based on your specific requirements free of charge.

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