Type AF High Slip Resistance Girder Clamp

Heavy duty 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 AF 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 has a recessed top to hold the bolt head captive while the nut and washer are tightened down using only one tool, alternatively use a Type AFW washer to convert the recess to a flat top. The skirt on the underside of the clamp abuts the edge of the beam flange and prevents the clamp rotating during installation. Manufactured from SG iron with a hot dip galvanised finish to provide high performance and anti-corrosion protection.

Features & Benefits

  • High slip resistance clamp evaluated for tensile, frictional and combined load applications.
  • 70kN static slip resistance or 250kN tensile (AF24 with 4 x property class 10.9 fasteners).
  • Recess holds the bolt head captive (property class 8.8).
  • Suitable for parallel and tapered flanges up to and including 10°.
  • The tail spans slotted clearance holes.
  • Lindapter recommends the use of DTI Washers conforming to EN14399-9 with the Type AF.
  • Independently approved for dynamic load applications to EN 1993-1-9. Contact us for more details.


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

Tail Lengths & Packing Pieces

The clamp is available in two tail lengths, Short or Medium, and can be used with Lindapter packing pieces to increase the clamping range. Choose the correct combination of tail length and packing pieces to suit a specific flange thickness. Download datasheet for selection table.

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 for further information.


  • Manufactured from 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 5:1) Slip1) / 2 Bolts (FOS 2:1) Tightening Torque* Tail Length Y X T T Width
Painted Steelwork2) Galvanised Steelwork short v1 medium v2 Type AF Type AF with AFW
kN kN kN Nm mm mm mm mm mm mm mm
AF12 M12 8.8 8.5 3.4 3.9 90 5 12.5 27 27 17 22 39
AF16 M16 8.8 16.0 8.0 10.0 240 8 15 35 37 22 27 49
AF20 M20 8.8 26.3 13.0 16.0 470 10 18 40 39 25 31 56
AF24 M24 8.8 40.0 24.0 30.0 800 15 30 48 60 32 42 82
AF12 M12 10.9 10.0 4.0 5.2 130 5 12.5 27 27 17 22 39
AF16 M16 10.9 19.5 11.0 12.0 300 8 15 35 37 22 27 49
AF20 M20 10.9 30.0 20.0 25.0 647 10 18 40 39 25 31 56
AF24 M24 10.9 62.53) 28.0 35.0 1000 15 30 48 60 32 42 82

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

2) Shot blast and painted steelwork.

3) 3.2:1 Factor of Safety.

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 DoC No.104

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.004

• Independently tested for dynamic load applications to EN 1993-1-9.

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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