Type AAF High Slip Resistance Girder Clamp

Adjustable girder clamp used to quickly connect steel beams with flat or tapered flanges. High slip resistance for tensile, frictional and combined load applications.

View technical specification Girder Clamp Configurator


The Type AAF girder clamp is used to achieve a fast steelwork fixing connection where high load capacities are present in either tensile, frictional or combined load directions. It features an innovative two-part design that incorporates a rocking washer to allow the clamp to self-adjust to suit a range of flange thicknesses. Manufactured from low temperature SG iron with a hot dip galvanised finish to provide high performance and anti-corrosion protection in cold environments down to -60°C

Features & Benefits

  • High slip resistance for tensile, frictional and combined load applications.
  • Self-adjusts to suit flange thicknesses 6mm to 40mm (size M20).
  • Safe working loads apply in temperatures as low as -60°C.
  • Suitable for parallel and tapered flanges up to 10°.
  • The tail spans slotted clearance holes.
  • Lindapter recommends the use of DTI Washers conforming to EN14399-9 with the Type AAF.
  • Independently tested for dynamic load applications to EN 1993-1-9.


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

Packing Pieces

Packing pieces are available to increase the clamping range. Download datasheet above for further information.

Location & End Plates

These plates ensure the clamps and bolts are located in the correct position relative to the supporting steelwork. Location plates are simple fabricated items designed to sit between the two sections to be clamped together to ensure the bolts are fixed at the correct centres. End plates are simple fabricated items that are pre-welded to support frames, bracket or sections, allowing connection to the supporting structure with standard Lindapter clamps. Download datasheet above for further information.


  • Manufactured from low temperature SG iron to BS EN 1563.
  • Available with hot dip galvanised finish.
  • Reaction to fire: A1 (Steel)

Durability and corrosion protection:

Corrosivity Class Galvanised Steel
C1 More than 50 years
C2 More than 50 years
C3 More than 20 years

For C4 and C5 corrosion categories contact us.

Technical Specification

Click to view labelled diagram

Bolt Safe Working Loads Dimensions
Product Code Size Z Property Class4) Tensile / 1 Bolt (FOS 4.5:1) Slip1) / 2 Bolts (FOS 2:1) Tightening Torque* Clamping Range3) V Y X T Width
Painted Steelwork2) Galvanised Steelwork
kN kN kN Nm mm mm mm mm mm
AAF12 M12 8.8 8.5 3.4 3.9 90 5 - 26 25 - 34 27 - 49 26 - 35 41
AAF16 M16 8.8 16.0 8.0 10.0 240 6 - 30 34 - 50 31 - 58 35 - 46 56
AAF20 M20 8.8 26.3 13.0 16.0 470 6 - 40 48 - 78 49 - 64 52 - 64 77
AAF12 M12 10.9 10.0 4.0 5.2 130 5 - 26 25 - 34 27 - 49 26 - 35 41
AAF16 M16 10.9 19.5 11.0 12.0 300 6 - 30 34 - 50 31 - 58 35 - 46 56
AAF20 M20 10.9 30.0 20.0 25.0 647 6 - 40 48 - 78 49 - 64 52 - 64 77

1) Slip resistant values calculated against movement exceeding 0.1mm.

2) Shot blast and painted steelwork.

3) For thicker flanges, packing pieces AFP1 and AFP2 are available (for AAF12 and AAF16 only) or packing piece AAFP3 (for AAF20 only).

4) For ease of installation when using 10.9 bolts Lindapter recommends using fastener assemblies to EN 14399-1.

* Torque figures based on bolts / setscrews in an unlubricated condition.

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.005

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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