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Type LB2 – Lindibolt™ 2

Self-heading bolt suitable for connecting steelwork to hollow sections where access is only available from one side.

View technical specification


The Type LB2 Lindibolt® is the original threaded stud expansion bolt which has been designed specifically to be used on refurbishment projects. This unique product will fit into standard pre-drilled steelwork, in typical clearance hole diameters of M10, M12, M16, M20 and M24.

The self-heading expansion bolt requires access to only one side of hollow section, and offers a faster alternative to welding or through-bolting, enabling contractors to reduce construction time and labour costs. It’s an incredibly flexible solution as it can be adjusted during installation to fit various thicknesses of steelwork, for example the M24 has a clamping range of 18–72mm. 

Also suitable for blind connections where access is available from one side only. Manufactured in mild steel with a zinc plated finish or in stainless steel grade 316.

Features & Benefits

  • Fits standard clearance holes.
  • Cost saving installation from one side.
  • For square, rectangular and circular hollow sections.


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


  • Manufactured from mild steel with zinc plating or stainless steel grade 316.
  • Reaction to fire: A1 (Steel)

Durability and corrosion protection:

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

For C4 and C5 corrosion categories contact us.

Technical Specification

Click to view labelled diagram

Lindibolt Hole Ø Safe Working Loads (FOS 5:1) Main Body (B) and Nut (C and D) Setscrew (F)
Product Code Bolt Length min max Tensile Single Shear Clamping Length Projection Thread Tightening Torque A/F Bolt Tightening Torque A/F
Z Y d d W P Z F
mm mm mm kN kN mm mm Nm mm Nm mm
LB10 M10 74 11 11.5 3.0 3.4 7 - 30 7.5 - 10 M10 20 17 M5 6 8
LB12 M12 85 13 13.5 5.0 5.0 10 - 36 9 - 12 M12 31 19 M6 11 10
LB16 M16 105 17 17.5 8.0 9.8 12 - 48 12 - 16 M16 81 24 M8 23 13
LB20 M20 128 21 21.5 14.0 15.2 14 - 60 15 - 20 M20 129 30 M10 45 17
LB24 M24 158 25 25.5 20.0 22.5 18 - 72 18 - 24 M24 203 36 M12 80 19

The safe working loads, in both tension and shear shown, are applicable to the Lindibolt only. Failure of the section, particularly on those with thin walls and a wide chord face, could occur at a lower figure and its strength should be checked by a qualified Structural Engineer.

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.002

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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