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ICC-ES Approved Hollo-Bolts

Product News

ICC-ES Approved Hollo-Bolts

Written by: Damian Haigh

03/06/24  |  8 Min read

The ONLY blind bolt that is ICC-ES approved in...

Hollo-Bolt is the original expansion bolt designed and manufactured by Lindapter since 1985.

It is 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 design category A through F.

No other expansion or blind bolt can offer this level of approval by ICC-ES!

With the Lindapter Hollo-Bolts steel sections can be connected quickly to pre-drilled Hollow Structural Section (HSS) with no proprietary tools and with access from only one side. This faster alternative to welding or through-bolting enables contractors to reduce construction time and labor costs.

Other features and benefits of Hollo-Bolt include:

  • Design for fatigue resistance now included in ESR 3330
  • LABC and LARC supplements for Los Angeles now included in ESR 3330
  • CBC and CRC supplements for California now included in ESR 3330
  • ICC-ES approved for all Seismic Design Categories (A through F)
  • Carbon Steel variants independently fire tested per ASTM E-119
  • Fast cost saving installation from one side
  • Suitable for square, rectangular and circular hollow sections
  • High resistance to shear and tension
  • Unique High Clamping Force design
  • Recognized in the AISC Steel Construction Manual
  • Carbon steel variants tested to -50° F

With the most comprehensive ICC-ES approval on the market you can be confident when specifying or installing Lindapter Hollo-Bolt that the product is fit for purpose and will get through planning permission without delays, and won't get rejected on site by building inspectors!

Every SIZE Approved!

Every standard diameter size of Hollo-Bolt is ICC-ES approved, including each of the three different lengths. This means you have a wide choice of product for a wide range of applications from the smallest 5 ⁄ 16" diameter Hollo-Bolt at 1 3 4 " long all the way up to the largest 3 ⁄4 " diameter Hollo-Bolt at 5 1 2 " long!!!

Every FINISH Approved!

Every Hollo-Bolt finish, corrosion protection and material is ICC-ES approved meaning you can choose the most suitable finish or material for your application whether that is in the sub zero temperatures of Alaska, the heat of California or the harsh corrosive offshore environment in the Gulf of Mexico!!!

  • Carbon Steel material with Zinc Plated plus JS500 finish - Zinc plating is a common corrosion protection method that involves applying a layer of zinc to the bolt's surface. When combined with JS500, a proprietary coating by Lindapter, the Hollo-Bolt gains enhanced corrosion resistance. This combination provides protection against rust and corrosion, making it suitable for both indoor and some outdoor applications.
  • Carbon Steel material with Hot Dip Galvanized finish - Hot dip galvanizing is a process in which the bolt is immersed in molten zinc. This results in a thick, durable zinc coating that offers excellent corrosion protection, even in harsh environments. Hot dip galvanized Hollo-Bolts are commonly used in outdoor and marine applications.
  • Carbon Steel material with Sheraplex finish - Sheraplex is an optional specialized corrosion protection coating (available on request). It is a multi-layer system, designed to provide long-term resistance against corrosion. Sheraplex-coated Hollo-Bolts are suitable for challenging environments, such as industrial plants or coastal areas, where corrosion resistance is crucial.
  • Stainless Steel Hollo-Bolts - Stainless steel Hollo-Bolts are inherently corrosion-resistant due to their composition, made from austenitic stainless steel. These bolts are highly resistant to rust and corrosion, making them suitable for environments where regular steel would quickly deteriorate, such as in food processing facilities or highly corrosive atmospheres.

Every HEAD TYPE Approved!

Every Hollo-Bolt head type is ICC-ES approved, and no other blind bolt has as many options, meaning you can choose the most suitable head type for your application whether that is an industrial project requiring a standard Hexagonal head, a Countersunk head for minimal head protrusion or our unique Flush Fit head for those architectural projects where looks are essential!!!

  • Hexagonal Head - This is the standard head variant of the Hollo-Bolt. It has a hexagonal head that can be tightened using a wrench or a socket set. This head variant is suitable for most applications where a secure connection is needed.
  • Countersunk Head - The countersunk head variant is designed for applications where an architectural finish is required. It allows for a neat and tidy appearance when the bolt is tightened, as the head has a minimal visible protrusion.
  • Flush Fit Head - The flush fit head variant is designed for applications where a completely flush finish is required. It provides a smooth, flat surface when tightened, making it suitable for aesthetic applications or situations where surface protrusion is not possible.

Click here to download the ESR 3330 report and start specifying Hollo-Bolt, the most approved blind bolt fastener on the market!!! 

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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