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Supplying the concrete construction industry with ‘unseen’ telescopic connection systems for stairs, landings, beams and columns. Specialist manufacturers of FERBOX reinforcement continuity system, to application requirements.

All our products meet industry demands for improved safety, construction efficiency and cost competitiveness. Our telescopic connection systems are endorsed by European Technical Approvals (ETAs). They comply with relevant Eurocode standards and are individually CE marked. Ferbox is endorsed by CARES Technical Approval and manufactured under a CARES Quality Management system to the ISO9001 standard.

Our products provide design freedom for architects, enabling ‘clean lines’ without cumbersome corbels or bracketry. Precast concrete manufacturers and in situ concrete frame contractors appreciate the reduction in cost, waste, cranage and noise but also the increased safety, robustness compliance, speed and efficiency.

Our team provides free technical and practical advice on product selection and installation. Our technical specialism, innovative approach and manufacturing agility means we’re often approached to help solve a specific issue. As a result, our product range continuously evolves to meet our customers’ construction challenges.

Invisible Connections is the registered trademark of Norwegian company Invisible Connections AS. In 30 years, countless telescopic connectors have been used in construction projects around the world.
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Featured Downloads

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Design guide
When deciding on which method to use for supporting precast stairs, this document highlights the ...
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Design guide
Precast concrete stair flights and landings are a common form of construction. As individual elem...
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Product catalogue
Precast concrete beams and columns is an aesthetic and efficient method of concrete frame constru...
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CAD object
Drawings of TSS and RVK telescopic connectors and REDiBOX permanent recess formers to insert into...
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BSF Beam Connectors
Steel connectors for precast concrete beams.
- E40 Designed joints in in situ concrete, E60 Precast concrete floors/ roof decks
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Reinforcement continuity system.
- E30 Reinforcement for in situ concrete, E40 Designed joints in in situ concrete
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Permanent recess former embedded into concrete walls to fit connectors cast into concrete floors and landings.
- E40 Designed joints in in situ concrete, E60 Precast concrete floors/ roof decks

Image gallery

BSF 225, 300, 450 BB
BSF 225, 300, 450 BC
BSF 700, 1100 BC
BSF 700, BSF 1100 BB
BSF in application (isometric view)
DTF 120, 150

Quality Assurance

Invisible Connections Ltd is certified to the following Quality Assurance schemes/standards:
CARES ISO 9000: 2019
CARES ISO 9000: 2019
ISO 9001: 2015 – CARES

Trade names

BSF Beam to Beam Telescopic Connectors
BSF Beam to Column Telescopic Connectors
DTS Beam to Beam Telescopic Connectors
DTS Beam to Column Telescopic Connectors
FERBOX Reinforcement Continuity System
REDiBOX Permanent Recess Formers
RVK Telescopic Stair Connectors
TSS Telescopic Stair Connectors

Contact details

Unit 6 Thame Forty,
Jane Morbey Road,
Oxfordshire, OX9 3RR
Tel +44 (0)1844 266000
Fax +44 (0)1844 390167

Alternative contacts

Derek Brown
Managing Director
Tel +44 (0)1844 266000
Ross Tew
Sales Manager
Tel +44 (0)1844 266567
Steve Fordham
Technical Manager
Tel +44 (0)1844 266565