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Type HB Hollo-Bolt™ Flush Fit Head

The ONLY blind fastener for structural steel approved by ICC-ES for combined loads in high seismic regions and Lindapter are the only blind bolt manufacturer to have ICC-ES approvals for its entire range including every size (diameter and length), every finish, corrosion protection and material, every head type (hexagonal, countersunk and flush fit) and of course every seismic deign category A through F.

View technical specification Hollo-Bolt Selector Tool

Overview

Hollo-Bolt is the original expansion bolt designed and manufactured by Lindapter since 1985. It is recognized in the AISC Steel Construction Manual and approved by ICC-ES for use in all Seismic Design Categories A through F, in compliance with the International Building Code.

They require installation access to only one side of the Hollow Structural Section (HSS), and offer a faster alternative to welding or through-bolting, enabling contractors to reduce construction time and labor costs. Installation is quickly carried out by inserting into pre-drilled steel and tightening with a torque wrench. Also suitable for blind connections where access is available from one side only.

The 'Flush Fit Head' version also ensures zero visible protrusion creating an opportunity for architectural design as the head is completely flush with the steel and discreet.

Supplied with an innovative installation nut allowing the Flush Fit to be installed without the requirement of specialist skills or equipment.

Hollo-Bolt Flush Fit is available in sizes 516", 38" and 12".

Updates to ESR 3330 March 2024 include:

  • Every size Hollo-Bolt (diameter and length) now approved
  • Every finish, corrosion protection and material now approved (Zinc Plated + JS500, Sheraplex & Stainless Steel)
  • Every head type (hexagonal, countersunk and flush fit) now approved
  • LABC and LARC supplements for Los Angeles now included
  • CBC and CRC supplements for California now included

 

Features & Benefits

  • Zero visible head protrusion.
  • Code compliant with IBC, IRC, CBC, CRC, LABC, LARC, ADIBC
  • Fast, cost saving installation from one side.
  • For square, rectangular and circular hollow sections.
  • High resistance to tensile and shear loads.
  • Low temperature tested to -50°F (carbon steel variants).
  • Countersunk and Flush Fit head types available.
  • Hollo-Bolt plug-in tool available to download within Tekla Warehouse.
  • Watch the Hollo-Bolt removal videos here www.lindapter.com/us/hollo-bolt-faqs

Approvals

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

BIM Tools

Click the logo to download the new Hollo-Bolt plug-in tool available in Tekla Warehouse.

Properties

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

Durability and corrosion protection:

Corrosivity Class Electroplated Steel Sheraplex Stainless Steel
C1 More than 50 years More than 50 years More than 50 years
C2 More than 20 years More than 50 years More than 50 years
C3 More than 10 years More than 20 years More than 50 years

For C4 and C5 corrosion categories contact us.

Technical Specification

Click to view labelled diagram

Collar Safe Working Loads (5:1 Factor of Safety)
Product Code Countersunk Bolt Ø Length Clamping Thickness Outer Ply Sleeve Outer Ø Ø Installation Nut Tightening Torque Tensile Single Shear
Z B W min t S D A/F
mm mm mm mm mm mm Nm kN kN
LHBM08FF#1 M8 50 10 - 27 8 13.75 24 19 23 4.0 5.0
LHBM08FF#2 M8 70 27 - 45 8 13.75 24 19 23 4.0 5.0
LHBM08FF#3 M8 90 45 - 64 8 13.75 24 19 23 4.0 5.0
LHBM10FF#1 M10 50 12 - 27 10 17.75 30 24 45 8.5 10.0
LHBM10FF#2 M10 70 27 - 45 10 17.75 30 24 45 8.5 10.0
LHBM10FF#3 M10 90 45 - 64 10 17.75 30 24 45 8.5 10.0
LHBM12FF#1 M12 55 12 - 30 10 19.75 33 30 80 10.5 15.0
LHBM12FF#2 M12 80 30 - 52 10 19.75 33 30 80 10.5 15.0
LHBM12FF#3 M12 100 52 - 74 10 19.75 33 30 80 10.5 15.0

  For Characteristic Resistances when designing a connection to Eurocode 3, please refer to DoP No.001

• Hollo-Bolts can be used on a wide variety of steel hollow shape sections. Safe working loads shown are based on use in S275 structural hollow section and are applicable to the Hollo-Bolt only in both tension and shear. 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.

Collar Safe Working Loads (FOS 5:1)
Product Code Countersunk Bolt Ø Length Clamping Thickness Outer Ply Ø Installation Nut Tightening Torque Tensile Single Shear
Z B W min t D A/F
ft lb lbs lbs
LHBM08FF#1 516" 2" 38" - 1116" 516" 1516" 34" 17 899 1124
LHBM08FF#2 516" 234" 1116" - 134" 516" 1516" 34" 17 899 1124
LHBM08FF#3 516" 3916" 134" - 212" 516" 1516" 34" 17 899 1124
LHBM10FF#1 38" 2" 12" - 1116" 38" 1316" 1516" 33 1910 2248
LHBM10FF#2 38" 234" 1116" - 134" 38" 1316" 1516" 33 1910 2248
LHBM10FF#3 38" 3916" 134" - 212" 38" 1316" 1516" 33 1910 2248
LHBM12FF#1 12" 2316" 12" - 1316" 38" 1516" 1316" 59 2360 3372
LHBM12FF#2 12" 318" 1316" - 2132" 38" 1516" 1316" 59 2360 3372
LHBM12FF#3 12" 4" 2132" - 278" 38" 1516" 1316" 59 2360 3372

• Hollo-Bolts can be used on a variety of steel hollow sections and shapes. Safe working loads shown are applicable to the Hollo-Bolt only. Failure of the section could occur at a lower figure and therefore its strength should be checked by a qualified Structural Engineer. Contact Lindapter for equivalent bearing area and diameter under cone.

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

    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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