Key Joint

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Connolly Key Joints are a continuous pour solution for contraction joints in slab on ground applications.

Connolly Key Joints are a roll-formed galvanised steel section used as a leave-in-place formwork to control shrinkage induced cracking. The profile is fixed in place using the patented peg and wedge system.

Our unique tongue profile provides positive load transfer with minimal stepping. For higher load applications the preformed knock-outs allow Key Joints to be used in conjunction with Connolly Universal Dowel Sleeves (UDS). The Universal Dowel Sleeves are installed in the steel section using the patented twist-fix feature.

Key Joint 150mm with Universal Dowel Sleeves for 16mm round dowels

Key Joints are available in 3 and 6m lengths for slab thicknesses from 100mm to 300mm. Custom heights and lengths are available on request.

A wide range of permanent and removable capping, and rebate moulds are available to be used with Connolly Key Joints.


  • Enables continuous pours
  • 4 different profile heights
  • Knockouts to accommodate a range of dowel sizes
  • Patented wedge fixing mechanism allows fast and accurate height adjustment
  • Additional stiffening ribs to ensure straighter joints
  • Galvanised coating for corrosion protection
  • Can be used to screed off which makes getting the right level quick and easy
  • A range of capping for various applications
  • Minimise liability risks from slip and trip claims​

driveinpeg.JPGPosition key joint in desired location and drive in the supplied pegs. Note that the LONGEST FLANGE of the key joint always goes TO THE TOP.

tapinwedge.JPGAdjust the key joint to the correct height and secure by tapping in the supplied wedges. If capping strips are to be used allow the appropriate set down distance and apply capping strip prior to pouring concrete.

pouroverkj.JPGPlace the reinforcement and pour the concrete over the key joint. Finish concrete surface to the top of the joint (NOT ABOVE IT). Always pour concrete evenly to both sides of the joint and ensure concrete is compacted into the keyways.

DescriptionKey Joint for 100mm slabKey Joint for 150mm slabKey Joint for 200mm slabKey Joint for 300mm slab
Slab thickness [mm]100150200300
Profile heights [mm]90135180270
Length [m]Standard lengths 3.00m and 6.00m
(custom lengths available on request)
Knock-out holesRound holes dia 21mm at 150mm centresKnock-out holes to suit UDS Sleeves at 150mm centres
Material0.4mm steel, galvanised Z2750.5mm steel, galvanised Z2750.5mm steel, galvanised Z2750.7mm steel, galvanised Z275
Pegs & WedgesPack of 4 per 3.00m length / Pack of 8 per 6.00m length
Peg dimensions8.5mm x 350mm8.5mm x 390mm8.5mm x 500mm12.0mm x 750mm

Custom lengths (up to 6m) available on request.
For cappings and rebate moulds please visit the Key Joint & Straight Up Contraction Joint capping page.

Use the form below to send us an email with your enquiry or request for drawings.