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Type GF Grate-Fast™

A high strength floor connector for securing rectangular open bar grating to the supporting steel without the need for drilling or welding in the field.

View technical specification


The Type GF Grate-Fast connector 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 steel, provides outstanding clamping force and a secure connection.

Product Selector

• LGF025-11W for 11-W or 11-P series of close mesh bar grating.

• LGF031 for GRP grating with stainless steel top hat bracket, Sheraplex coated body and socket head screw.

• LGF037 (OSB) is hot dip galvanized for increased corrosion resistance.

• LGF037 is hot dip galvanized for use with 1316" width floor grating bars only.

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 (LGF031 only).
        ◦ Mild Steel, hot dip galvanized (LGF025-11W, LGF037 (OSB) and LGF037 only).
    • Body: 
        ◦ Malleable iron, Sheraplex (LGF031 only).
        ◦ Malleable iron, hot dip galvanized (LGF025-11W, LGF037 (OSB) and LGF037 only).

  • Reaction to fire: A1 (Steel)

Durability and corrosion protection:

Corrosivity Class Galvanized 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 Nm mm
LGF0311) M8 3 - 19 22 - 38 5 - 10 19 - 48 5 6
LGF037 (OSB)2) M10 3 - 19 20 - 50 3 - 7 25 - 45 11 10
LGF0371) M10 3 - 19 19 -40 3 - 6.5 30 11 8

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 

Product Code Bolt Flange Grating Bar Depth Grating Bar Width Bar Distance Tightening Torque Hexagon Key / Socket
ft lb mm
LGF025-11W M6 (14") 14" - 34" 1" - 2" 18" - 316" 1116" 3 5 (316")
LGF0311) M8 (516") 18" - 34" 78" - 112" 316" - 38" 34" - 178" 4 6 (732")
LGF037 (OSB)2) M10 (38") 18" - 34" 1316" - 2" 18" - 14" 1" - 134" 8 10 (38")
LGF0371) M10 (38") 18" - 34" 34" - 1916" 18" - 14" 1316" 8 8 (516")

1) Supplied with socket head cap screw.

2) Supplied with hex head screw.

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

    Drilling and welding in the field 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 detailing

    Free connection detailing

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

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