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Suppliers of: Undercut Anchor Bolts, Anchor Bolt, Safety Bolts

When the EJOT fastener manufacturing Group acquired the LIEBIG brand in 2017, it made a commitment to provide full accessibility to the LIEBIG product range and the technical data that supports it.

The unique modular design and absolute strength of LIEBIG anchoring products is well known by structural engineering professionals around the world. The LIEBIG brand has an unrivalled reputation to deliver outstanding strength and performance in its unique portfolio of anchoring products. Now this proven technology is part of EJOT’s own manufacturing excellence and specification support facility around the world, making LIEBIG products and the technical guidance to support them openly accessible.

For structural engineers, being less familiar with the EJOT brand is understandable, unless career paths have included sorties into the numerous sectors that comprise industrial roofing, cladding and insulation. Designing and manufacturing fastening solutions for this domain is EJOT’s world.

LIEBIG anchoring technology and EJOT’s manufacturing and technical support is now one market force. LIEBIG products are hallmarked classics and the modular nature of the range makes all LIEBIG anchors easy to adapt and easy to create bespoke lengths and assemblies quickly, efficiently and cost-effectively. All LIEBIG anchors have Option 1 and Option 7 ETA approvals for cracked and non-cracked concrete.

For use where safety is paramount, typical applications include installations into nuclear power plants, cranes, industrial plants, conveyor systems and also for special civil engineering solutions.

Together EJOT and LIEBIG are making this unique anchoring technology and the technical knowledge to support specification readily accessible; putting the LIEBIG product range firmly back in the hands of the engineer.

Our Product Range Includes:


Ultraplus M12 - M36:


The LIEBIG ULTRAPLUS® anchor offers the highest tensile and shear performance of any other undercut anchor, from 320KN tensile load and beyond!

  • LIEBIG® Ultraplus - Anchoring of Steel Structures and Baseplates in Nuclear Power, Oil, Gas and Water Treatment. The Ultraplus ZP can be installed in the most Heavy Structural Applications.

  • LIEBIG® Ultraplus A4 - The undercut anchor for exceptionally high loads in cracked and non-cracked concrete – also for shock and seismic loads.





The LIEBIG Safetybolt design with its double expansion gives optimal frictional resistance for a strong and controlled installation giving you a more secure performance for steel construction, ligfting systems and more. With it’s high load capacity the LIEBIG Seafetybolt is second to none. 

  • LIEBIG® Safety Bolt B A4 - A solid steel safety bolt available with a hex nut, domed washer and threaded stud or a hex head screw with domed washer or even with a countersunk headed screw for a flush finish this high capacity anchor can be used in both cracked and non-cracked concrete.

  • LIEBIG® Safety Bolt S A4 - With its uniformed expansion of the sleeve over the entire length, Solid all-steel construction  and torque indication from domed washer the Liebig safety bolts performance is second to non. With custom lengths available on request you can be assured that we have the best solution for your project.

  • LIEBIG® Safety Bolt SK - Application of the installation torque causes the anchor’s two opposing cones to be drawn into the expansion sleeve. This causes the sleeve to be pressed against the sidewalls of the hole over its entire length and results in optimum frictional resistance and high load capacity in cracked and non-cracked concrete.

  • LIEBIG® Safety Bolt SK A4 -  With cylindrical expansion for optimal friction resistance, higher anchoring intensity from twin-cone design and torque indication from domed washer the Liebig safety bolt gives you peace of mind.

  • LIEBIG® Safety Bolt S - A twin-cone sleeve anchor for high loads, Torque-controlled mechanical anchor manufactured in a Solid, all-steel construction suitable for use in both cracked and non-cracked concrete.





The LIEBIG Anchor Bolt is a general purpose, heavy duty anchor for use with high loads and high economic capacity. The unique design gives torque indication for a presice and controlled installation.

  • LIEBIG® Anchor AB A4 - Used for fFixing down of steel baseplates, columns and structural steel beams in both cracked and non-cracked concrete this Liebig anchor gives you the performance you need.

  • LIEBIG® Anchor AS - General purpose heavy duty anchor. This is an economical anchor for wide range of uses complete with torque indication from its domed washer.

  • LIEBIG® Anchor AS A4 - An economical high capacity anchor approved for use in cracked and non-cracked concrete. Some of the applications this great anchor can be used in include Steel construction, Cable trays, Railing, Machines, Gates, Façades, Lifting systems and Base plates to name but a few.

  • LIEBIG® Anchor AB - A carbon steel zinc plated anchor, ETA approved for cracked and non cracked concrete complete with hex nut. Available in thread size M6 to M16 and as well as standard lengths special lengths are also available.





The LIEBIG SUPERPLUS® anchor is an undercut anchoring system that does not require any special setting tools. An undercut anchor with the ease of installation of an expansion anchor you only need apply torque to create the self-undercut. 

  • LIEBIG® Superplus BLS - The undercut fixing system that does not require a special setting tool.

  • LIEBIG® Superplus BLS A4 - Automatic self-undercutting. The unique design of the SUPERPLUS causes an undercut to be created when the installation torque is applied. The sleeve’s outer cutting teeth expand and undercut into the base material.

  • LIEBIG® Superplus BLS P -  High capacity anchor for cracked and non-cracked concrete the Liebig Superplus has Increased reliability due to undercut technology.

  • LIEBIG® Superplus ILS - A high capacity anchor for cracked and non-cracked concrete with increased reliability due to undercut technology. Simple installation, no special drill bit or setting tool required while applying torque creates undercut thus allowing reduced edge distances and spacings. With two approved embedment depths per diameter the Superplus boasts a lower installed cost than traditional undercut anchors. Approved for fire resistance.

  • LIEBIG® Superplus SLS: A self-undercutting anchor with hexagon screw and washer. The Liebig Superplus SLS boasts automatic self-undercutting and is a unique heavy-duty anchor for push through installations. The Superplus SLS is the simplest, quickest and safest solution on the market.

  • LIEBIG® SUPERPLUS SKLS - An automatic self-undercutting, unique heavy-duty anchor for push through installation with threaded bolt, countersunk screw and countersunk insert. For indoor and outdoor areas, as well as industrial applications.


 For more information or technical downloads please visit our website:

  • ULTRAPLUS - The undercut anchor for exceptionally high loads in cracked and uncracked concrete
  • ANCHOR - High Capacity General Purpose Anchor
  • SAFETYBOLT - Twin-cone heavy duty anchor for high-power performance
  • SUPERPLUS - The undercut fixing system that does not require a special setting tool.

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High performance critical fastening with first class, full technical support.

ANCHORS Expansion
ANCHORS Expansion Fire Resistant
ANCHORS Purpose Made Bespoke
ANCHORS Screw CE Marked ETA European Technical Approval
ANCHORS Stainless Steel
ANCHORS Steel Carbon Steel Zinc Plated
ANCHORS Steel Zinc Plated
ANCHORS Undercut
BOLTS Expansion Bolts
BOLTS Expansion Bolts CE Marked
BOLTS Expansion Bolts ETA European Technical Approval
BLS Anchor Bolt

LIEBIG Now with EJOT® Global Support

June 2024

The good news is that LIEBIG is alive and well and in safe hands having recently been acquired by the global fastenings manufacturer EJOT, as part of the acquisition of Finnish company, SORMAT. Add to the mix that SORMAT itself acquired LIEBIG from Simpson Strong-Tie International Inc. back in 2012, and it’s easy to spot the confusion – something management at EJOT’s UK manufacturing centre near Leeds, are keen to put right.

Robert Hardstaff is EJOT’s managing director in the UK:

“EJOT manufactures high performance fasteners for the modern building envelope. Our pedigree in terms of technical innovation is second to none and therefore, a perfect fit for LIEBIG. By combining our global knowledgebase with LIEBIG’s specialist teams we will ensure that the product range is easily accessible, continues to be performance-driven, and supported by responsive technical guidance”.

Paul Papworth has recently joined the EJOT team, bringing a wealth of knowledge born from a career spanning more than 30 years in construction fixings and anchoring. Paul worked for a leading anchor manufacturer in the UK and Asia region for most of that time. He outlined his working knowledge of the Liebig product range:

“We will focus our attention on the major LIEBIG products and variants. That’s the Ultra-plus and Super-plus undercut anchors, and the high-performance LIEBIG Anchor and Safety Bolt. These are hallmarked classics and we want engineers to know where they can come to for the products and for guidance. They also need to be aware that the modular nature of the Liebig range makes all of these anchors easily adaptable, which means they can get bespoke lengths and assemblies quickly, efficiently and of course, cost-effectively.”

Paul has thoroughly briefed LIEBIG’s product USP’s to his new colleagues. Gary Robson is EJOT’s sales engineer in the north of England and in turn, has been working closely with Paul to familiarise him with EJOT’s own concrete fixings range.

“Customers looking to source LIEBIG products can now access technical information. We recognise that LIEBIG anchors are specification driven. The modular flexibility of LIEBIG products simply means that with the correct technical guidance, purchase and supply is just as fast. The ethos of EJOT’s business model is one of technical support, so we would encourage any customer in need of further assistance to make contact”.

About EJOT

The EJOT Group employs over 3400 personnel worldwide. In the UK, EJOT’s testing and development facility, Applitec, is pivotal in providing support to its national team of sales engineers. EJOT UK is one of only six manufacturers to gain full membership status with the Construction Fixings Association.

LIEBIG’s unique post-installation solution can challenge cast-in anchoring dominance

June 2024

How LIEBIG’s unique post-installation solution can challenge cast-in anchoring dominance

Given the perceived performance benefits, cast-in place anchoring has long been the preferred approach for structural engineers when considering applications in to concrete. However, as the LIEBIG Ultraplus has demonstrated in the project to create a new lifting bridge over the River Yare in Great Yarmouth, post-installation anchors can offer equivalent performance whilst also being better suited to the complexities of modern construction processes.

The £121m Herring Bridge project is an excellent example of how the application of innovative products can enable major civil engineering projects to be delivered more efficiently in a shorter timescale.

The project’s New York based designers, Hardesty & Hannover, who worked in conjunction with specialist consultants Roughan & O’Donovan (ROD), are no strangers to complex bridge construction having worked on projects throughout the US and Europe. But the challenges facing the team on the Great Yarmouth scheme required ‘outside the box’ thinking to satisfy the structural requirements for a bridge of this type and scale, whilst accommodating a realistic delivery schedule for the bridge’s key phases.

The twin bascule bridge construction process involved building cofferdams on both banks of the river. These house the machinery and mechanism required to lift, hold, and lower each leaf of the bridge, all of which had to be securely anchored to the concrete.
‘Real world’ practicalities versus the ‘ideal world’

As with many major civil engineering projects involving the kind of ‘design and build’ process used here by main contractors BAM Farrans, the team did not have the luxury of the ‘ideal world’ approach where anchors are cast-in to the concrete. This was primarily because the construction of the cofferdams had to commence as soon as the project received the green light, which meant there was no scope for the extended design time that cast-in anchors would have demanded.

The design team, therefore, explored the potential for a post-installation anchoring solution to attach the baseplates of the bridge’s operating mechanism. Crucially, any anchors would have to be suitable for the concrete conditions within the cofferdam design and offer a very high load capacity.

It was at this point that Yorkshire-based engineering specialists Qualter Hall were consulted to help identify a post-installation anchor that would meet this demanding criteria. Qualter Hall’s experience in delivering numerous major infrastructure projects across the UK was invaluable, and they quickly spotted the potential of LIEBIG Ultraplus anchors.

These heavy duty undercut anchors from EJOT are renowned for their ability to accommodate exceptionally high loads in cracked and non-cracked concrete. They are manufactured in high strength carbon steel and have demonstrated reliability in resisting dynamic loads, shock loads and seismic loads.
How could the post-installation anchors demonstrate compliance?

Ultraplus is an ETA (European Technical Assessment) approved heavy duty anchor which is already widely specified around the world for anchoring steel structures and baseplates into concrete. Such is its performance that it has been used extensively in sectors including nuclear power, the oil and gas industry and water treatment.

For the Herring Bridge, the design required EJOT to produce and deploy possibly the largest post installed mechanical anchors ever used in a civil engineering project. Two lengths of M36 size Ultraplus anchors were produced, with the longest being 1.45m in length and the shortest 1.09m, with both lengths being used on the same baseplates in an unconventional yet successful design approach.

It was an approach that, despite being incompatible with the ETA, did satisfy the requirements of another globally respected building standards code as EJOT UK’s anchoring specialist, Paul Papworth explained:

“The initial design proposal was to use more anchors at a shallower embedment depth, but we believed this was unsuitable because the concrete capacity would have been insufficient to support the projected forces. Given our understanding of the capabilities of Ultraplus, we supported through our design team an alternative, more unusual method of using mixed length anchors and the concept quickly gained traction within the project team.

“Whilst the ETA does not legislate for such a permutation, i.e. the use of different lengths of anchor in the same baseplate, the ACI (American Concrete Institute) Building Code does because it takes into account the additional area of resistance in the concrete which can be created by the approach. This meant our anchor specification for the Herring Bridge, in conjunction with our advised redesign of the baseplate to allow increased concrete capacity to be achieved, would be approved using a combination of different design codes.”

Replicating cast-in anchors through an innovative stress transfer design
The Ultraplus anchor’s design is unique in the way that it transfers stress into the concrete extremely effectively. It also does this in a way that differs significantly from ‘normal’ post-installed anchors and other undercut anchors, including those intended to work like cast in anchors.

With Ultraplus, the compression forces in the concrete mirror those of a cast-in solution rather than those of a normal post installed undercut anchor. This is due to the facing direction of the expansion segments and the fact that the undercut is on the same parallel plane to the surface of the concrete, rather than being at an angle to it.

Standard Undercut Anchor – Compression of the concrete is created by partial expansion forces being created at the bottom of the anchor.
Typicasl Cast-in Place Anchor – Compression of the concrete is achieved between the cast-in washer plate and the concrete.
LIEBIG Ultraplus Anchor – Compression of the concrete is achieved between the undercut and the concrete surface.

Demonstrating compliance with the ACI Building Code enabled Ultraplus anchors to be deployed in this bridge construction project with confidence and ensure a post-installation approach could be utilised. The advantages that stemmed from this meant the bridge’s design and construction time could be reduced, with subsequent cost benefits.

And while the project was not without its challenges, largely as a result of multiple components coming together ‘when ready’ rather than ‘when scripted’, Paul and the EJOT team worked to ensure any modifications or additional support requirements which arose during installation could be resolved collaboratively without having an adverse effect on the build schedule or budget.

BAM Farrans’ Lynsey McNeilly commented:

“Every project gives us an opportunity to apply what we learnt previously, but the knowledge and skills we have developed during this project could prove extremely valuable to us and all project partners.

“In terms of anchoring into concrete, the performance we have been able to achieve using the bespoke LIEBIG Ultraplus anchors, in line with the design recommendations provided by EJOT and the expertise of drilling specialists Core Cut, tells us that a post-install approach can be advantageous even where cast-in is also viable. And that could help us deliver projects like this for clients in future more efficiently without compromising performance goals.”

Securing of the first baseplate showing four of the 12 Ultraplus anchors in position.

The turnbuckle baseplate with anchors partially installed.

Image shows two of the four baseplates delivered to site which are designed to to secure the lifting and lowering hydraulics. (Lower clevis).

The image shows top hat plastic washers placed in the holes prior to placement of the baseplate.

Baseplate template used on the lower clevis. Project timelines dictated Ultraplus anchors were installed ahead of finished baseplate delivery.

Ultraplus anchors secure angled that support the hydraulic mechanisms of the bridge decks as well as the tail locks that will hold the bridge in its raised and open.

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