Durable MBT Parallel Thread Rebar Coupler

The MBT Bolt 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. Neither bar end preparation to form threads, nor bar rotation are required. MBT couplers can also be used to join imperial, plain round or deformed reinforcing bars.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. As this happens the serrated saddles bite into both the bar and the shell of the coupler. The lockshear bolts of couplers up to and including the ET20 can be tightened using a ratchet wrench. For larger couplers a nut runner is recommended. In all cases heavy duty sockets should be used. When the pre-determined tightening torque for the bolts is reached, the heads shear off leaving the top of the installed bolt slightly proud of the coupler. This provides an instant visual check of correct installation.Note: Impact tools must not be used to tighten lockshear bolts.

Size: 12mm-40mm

Meet the requirements of steel bars: HRB500/B500B/SD600/ASTM 75

Material: 40CR

▎Advantage:

• High connection strength and stable performance.

• Easy installation and disassembly, high efficiency.

• Good compatibility with various bolts and equipment.

• High durability, not easy to wear or loosen.

• Safe and reliable, suitable for industrial and construction applications.

▎Application & Installation Position

• Secondary structure, non-load-bearing reinforcement, construction reinforcement, constructional column, lintel, ring beam, tie bar, masonry tie bar connection

• Prefabricated components, prefabricated assemblies, prefabricated stairs, prefabricated slabs, prefabricated partition wall reinforcement connection

• Temporary fixation, reinforcement, and maintenance projects, temporary support, on-site reinforcement, old building renovation

• Areas with extremely limited space, impossible for threading or extrusion, pipe well, small column pier, concealed installation area

• Projects with extremely high speed requirements, simple projects, multi-story civil buildings, simple factories, rural self-built houses, small-scale renovation projects

▎Step-by-Step Installation Operation Method

1. Clean rust, mortar and burrs on both rebar ends, keep bar surface flat.

2. Insert two rebars separately into both ends of MBT coupler until bar ends butt tightly in the middle of sleeve.

3. Use matched heavy-duty socket and ratchet wrench to tighten lock bolts in diagonal sequence.

4. Keep tightening until bolt heads shear off completely, the residual bolt top is slightly exposed outside the sleeve as qualified mark.

5. Check all bolts for full shear-off; if any bolt fails to break, re-tighten to standard torque to complete permanent connection.

6. Note: Impact electric tools are prohibited for bolt tightening to avoid false torque.

▎Common FAQ

Q1: What types of rebar can this MBT coupler connect?

A: Fit HRB400/HRB500 deformed ribbed bar, plain round bar and imperial standard rebar of same diameter, sizes cover 10–40mm.

Q2: Do I need hydraulic equipment during installation?

A: No hydraulic machine required; only standard ratchet wrench is enough for all specifications.

Q3: How to confirm the connection meets standard torque?

A: Lock bolts are torque-specified; heads will shear off automatically once reaching standard tightening force, visual inspection directly available.

Q4: Can it be used in seismic zone buildings?

A: Yes, excellent fatigue and shock resistance, fully meets seismic design requirements for bridges and high-rises.

Q5: Is it suitable for underground narrow construction space?

A: Absolutely, compact structure without large equipment occupation, the best choice for confined closure pour sections.

Q6: What international standards does this product comply with?

A: Meet IS 16172:2014, JGJ107-2016, ACI318, BS8110 multiple construction specifications.