MBT Rebar Coupler

MBT Rebar Coupler Trade Information

Minimum Order Quantity
1000 Number

Delivery Time
24 Hours

MBT Rebar Coupler About

What is an MBT Rebar Coupler?

The MBT coupler is a bolted mechanical splice. It consists of a seamless steel sleeve with two rows of "lockshear" bolts. Unlike standard couplers, it does not require the rebar to be threaded or forged.

Why is it used?

No Bar Preparation: Used when bars are already cast in concrete and cannot be threaded.

Retrofitting: Ideal for repairing damaged structures or extending old columns where the bar ends are uneven.

Time-Sensitive Projects: Eliminates the need for threading machines on-site, speeding up the installation process.

Classification

1. Standard MBT: For joining two bars of the same diameter.

2. Transition MBT: For joining bars of different diameters (e.g., a 25mm bar to a 20mm bar).

3. Continuity/Headway MBT: Used for connecting bars in narrow spaces where one bar cannot be rotated.

Application

Infrastructure Repair: Bridge deck extensions and pier rehabilitations.

High-Rise Buildings: Connecting column bars where lap-splicing would cause congestion.

Metro Rail Projects: Critical joints in tunnels and underground stations.

Installation Process

1. Insertion: Insert the ends of the two rebars into the MBT sleeve until they meet the center stop.

2. Initial Tightening: Tighten the lockshear bolts by hand to secure the bars.

3. Final Locking: Use an impact wrench or a standard wrench to tighten the bolts until the bolt heads shear off.

o Note: The sheared-off head is a visual guarantee that the correct torque has been applied.

Testing Standards (IS 16172:2023)

Surya Engineering ensures all MBT couplers meet the latest IS 16172 benchmarks:

Static Tensile Test: The joint must achieve a strength at least 125% of the specified yield strength ( $$f_y$$ ) of the bar.

Slip Test: The total slip under load must not exceed 0.1 mm.

Visual Inspection: Every bolt head must be sheared off to pass site inspection.

Advantages of MBT Couplers

Versatility: Works with any grade of TMT bar (Fe 500, Fe 550, etc.).

Compact Design: Eliminates "rebar congestion" caused by traditional lapping, allowing for better concrete flow.

No Special Labor: Does not require skilled threading machine operators or welders.

Weather Independent: Can be installed in rain or extreme heat, unlike welding.

No Bar Preparation: Unlike standard couplers, you don't need to thread or forge the rebar. This is a massive time-saver for on-site repairs.

Installation with Basic Tools: Can be installed using a standard wrench; no specialized threading machinery is required at the construction site.

Visual Quality Check: The "shear-bolt" technology ensures that once the bolt head snaps off, the correct torque has been applied. No guesswork for inspectors.

Ideal for Retrofitting: Perfect for connecting new bars to old "starter bars" where threading is impossible.

Surya Engineering has specialized in high-performance mechanical splicing systems. Adding the MBT (Mechanical Bolted Transition) Coupler to your Surya brand portfolio on platforms like TradeIndia will appeal to contractors looking for "repair and retrofit" solutions where bar threading is impossible.