The Hollo-Bolt fixes to hollow and open steel sections from one side — no welding, no drilling a matching hole on the blind face. Stocked in five diameters, three head styles, and multiple finishes.
Installs through a single clearance hole. Ideal for closed sections, beams, and places you can't reach the back of.
Grade 8.8 bolt torqued against a four-segment expansion sleeve — higher performance than most blind fasteners.
Can be unbolted and re-used, unlike welded studs or structural rivets — good for modules designed to come apart.
Third-party evaluated under ICC-ES ESR-3330 for load, fire, and seismic applications in the US.
All three share the same expansion body — choose the head that suits your fixture. Hex for general structural work, countersunk where a flush finish matters, flush-fit for a recessed pocket.
The standard Hollo-Bolt. Hex head with captive washer, installed with a standard wrench or socket. Specified on most structural connections.
Flat, 82° countersunk head with internal hex drive. Sits flush with the fixture face for applications where a low profile is required.
Recessed head that sits below the face of the steel when installed in a counterbored pocket. Clean appearance for exposed architectural work.
The Hollo-Bolt is stocked in five imperial diameters with metric equivalents on request. Each diameter is offered across all three head styles and the full range of finishes.
A single clearance hole through both faces of the steel section. The Hollo-Bolt goes in, the bolt is torqued, and a four-segment sleeve expands behind the blind face to form a secure connection.
One clean hole through both walls of the section, sized per the published fixture hole chart.
The assembly — bolt, sleeve, cone, and head — drops in as one piece. No back-side access required.
Apply the specified torque. The cone draws up inside the sleeve, splaying its four segments against the blind face.
The fixture is clamped against the exposed face; the expanded sleeve holds it from behind. Removable, re-usable.
Pick head type, diameter, finish, and fixing thickness. We'll match the right SKU, show published load data, and build a quote cart you can send to our desk.
Open the Selector →Indicative working and ultimate load values per diameter, based on the manufacturer's published test data for a grade 8.8 bolt into structural steel. Confirm application-specific values against the current Lindapter technical datasheet and ICC-ES ESR-3330.
Case studyDuring the refurbishment of the Barlow Shed train shed, a large quantity of connections had to be made into existing structural steel without drilling from the far face or welding to heritage members.
Hollo-Bolts were specified for new walkway and service fixings across the structure. The one-sided installation kept the original steel untouched on the hidden face, while the published ICC-ES data satisfied the structural engineer's load calculations.
Anywhere the back side of a beam, column, or tube section isn't accessible — and welding isn't acceptable.
Hollo-Bolts are supplied in four finishes covering most interior and exterior steel work. We'll help match the finish to the service environment — saltwater, buried, coated, or exposed.
Indoor and dry service. Cost-effective general-purpose finish.
Outdoor and atmospheric service. Standard on most structural work.
Diffusion-bonded zinc for threaded parts; tight tolerance protection.
Marine, chemical, and food-process environments. Non-magnetic.
We carry an inventory of Lindapter Hollo-Bolts across the most-called diameters, heads, and finishes. Less common combinations ship direct from Lindapter on short lead times.
Head style, diameter, finish, and quantity — or paste the line items from your BOM. Most quotes turn around within 24 hours.
Unsure which diameter fits your load case? Our team can walk you through the published capacity tables and fixture-hole chart.