High-Strength Mechanical Rebar Connection Without Threading or Welding
Industrial-grade Mechanical Bolted Coupler (MBT) to connect fixed TMT bars 12-40mm without bar preparation. Features high-tensile shear bolts and internal serrated saddles that bite into rebar for full tensile strength. Perfect for beam-column joints, congested RCC, and repair work.
Product Media
A Mechanical Bolted Coupler is a high-strength mechanical rebar splice system used to connect two reinforcement bars end-to-end without welding or conventional threading. The coupler joins the rebars through high-strength shear bolts, creating a secure mechanical connection suitable for reinforced concrete construction.
Mechanical Bolted Couplers are widely used where reliable reinforcement continuity, faster installation, and reduced reinforcement congestion are required. They are particularly suitable for construction projects involving columns, beams, foundations, retaining walls, bridges, tunnels, precast components, and other reinforced concrete structures.
Insertion: The reinforcing bars or members are inserted into the coupler sleeve.
Clamping: Lockshear bolts are tightened. As the bolts are torqued, they press against the bars (or against serrated saddles), creating a strong mechanical interlock.
Shear-Off: When the required torque is reached, the bolt heads shear off. This ensures that every bolt has been tightened to the specified torque, eliminating reliance on torque wrenches or operator judgment.
Load Transfer: The connection transfers both tensile and compressive forces between the bars, often achieving full-strength splice performance that meets or exceeds the yield strength of the parent bar.
1. Standard Type: Joins two bars of same diameter where at least one bar can rotate.
2. Transition / Reducer Type: Joins two different diameters, e.g., 25mm to 20mm. Sleeve is stepped.
3. Long / Positional Type: For situations where neither bar can move axially or rotate, like closing a column or connecting precast elements. One side is longer to allow full insertion then sliding back.
| Parameter | Mechanical Bolted Coupler |
|---|---|
| Product Type | Mechanical Rebar Coupler |
| Connection Method | Mechanical Bolted Connection |
| Locking System | High-Strength Shear Bolts |
| Rebar Preparation | Generally No Threading Required |
| Rebar Type | Deformed Reinforcement Bars |
| Connection | Bar-to-Bar End-to-End |
| Load Transfer | Mechanical Grip / Bearing Mechanism |
| Installation | Bolt Tightening |
| Application | RCC Buildings & Infrastructure |
| Installation Tools | Recommended Torque / Spanner Tools |
| Available Sizes | Depends on Rebar Diameter |
| Finish | Black / Zinc / Other Protective Finish as specified |
| Testing | Tensile, Slip and Other Applicable Tests |
| Standards | IS 16172:2023 |
For the actual Surya Engineering product page, I recommend listing only the diameters that your particular Mechanical Bolted Coupler has actually been manufactured and tested for.
A website table can be presented like this:
| Rebar Diameter | Coupler Availability |
|---|---|
| 16 mm | Available* |
| 20 mm | Available* |
| 25 mm | Available* |
| 32 mm | Available* |
| 40 mm | Available* |
If you want you Can also See this Different Types Of MBT Coupler
MBT Rebar Coupler 12mm,16mm & 20mm
Check the reinforcement bars for damage, excessive rust, dirt or deformation that could affect insertion and gripping.
Insert the first reinforcement bar into the coupler to the manufacturer's specified insertion depth.
Insert the second bar from the opposite side and check alignment and engagement.
Tighten the shear bolts progressively using the specified installation tool and sequence.
Continue tightening until the bolt heads reach the specified shear condition.
Visually inspect the completed splice to confirm correct bar insertion and bolt installation.
The Mechanical Bolted Coupler does not require threading of the rebar itself. The lockshear bolts embed directly into the bar surface through conical ends.
For MBT coupler variants that involve threaded components:
Thread Pitch: 2.5 mm to 4 mm depending on coupler size
Bolt Thread Size: M14 for 12–20 mm bars, M16 for 22–25 mm, M21 for 32 mm
Thread Taper: 60 degrees (for certain MBT variants)
| Region | Major Locations |
|---|---|
| West India | Mumbai, Thane, Pune, Nagpur, Ahmedabad, Surat, Vadodara |
| North India | Delhi NCR, Noida, Gurugram, Jaipur, Lucknow, Chandigarh, Ludhiana |
| South India | Bengaluru, Chennai, Hyderabad, Visakhapatnam, Coimbatore, Kochi |
| East India | Kolkata, Howrah, Bhubaneswar, Guwahati, Patna, Jamshedpur |
| Central India | Indore, Bhopal, Raipur, Nagpur |
Shear-bolting couplers generally do not require conventional threading of the rebar ends.
Yes. The applicable product should be qualified and tested according to the relevant requirements and project specifications. IS 16172:2023 includes mechanical performance tests such as tensile and slip testing, with cyclic and fatigue testing depending on the applicable requirements.
Mechanical splicing can reduce congestion by replacing overlapping bars at the splice location, particularly in heavily reinforced sections.
Technical Details
Where It's Used
We manufacture to order. Contact our team with your requirements and we'll provide a tailored quote.
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