MBT Couplers for Joining Rebar
Ancon MBT couplers do not require bar end preparation to form threads, the bar ends are supported within the coupler by two serrated saddles, and as the lockshear bolts are tightened, the conical ends embed themselves into the bar.
The MBT range of couplers provides a cost-effective method of joining reinforcing bars, particularly when the fixed bar is already in place and there is insufficient space for a hydraulic swaging press. MBT Couplers are easy to install and achieve failure loads higher than 115% of the characteristic yield strength of grade 500 reinforcing bar.
The MBT range of couplers requires neither bar end preparation to form threads, nor bar rotation.
1. Place the MBT coupler over the end of the bar to half the coupler length +/- 6mm and finger tighten the lockshear bolts onto the bar.
Place the other bar end into the coupler until it pushes up against the first bar and finger tighten the remaining lockshear bolts. Check alignment and make any adjustments.
Fully tighten the lockshear bolts using either a ratchet wrench or a nut runner as appropriate. Tighten all bolts in a random alternating pattern until all the heads of all the bolts shear off.