Rebar couplers are used in reinforced concrete structures to replace normal Rebar lap joints. The couplers are also suitable for use in reinforced concrete columns and walls. Each rebar coupler consists of a piece of rebar equipped with thread and coupler sleeve at the right end as viewed in the direction of installation. In construction joints, Rebar Couplers can be used to replace all pieces of rebar going through the formwork.

Reinforced concrete design and construction practice has historically focused on the use of lap splicing as a method of transferring load between reinforcement bars.

rebar couplers

Self drilling anchors bolts is composed of hollow anchor bar, coupler, nut, drill bit, plate, and centralizer. It can combine drilling, grouting and anchoring in one process. Self drilling anchors are the advanced type of fully threaded hollow steel tube rods. SDA is a fully threaded rod with an inner and outer diameter hollow steel tube.

This relies on the load being transferred from one rebar, through the surrounding concrete and into the adjacent lapped rebar. However, the lapping of reinforcement is not always the most appropriate splicing method and there are many situations where the use of mechanical rebar couplers is more desirable from a design perspective, more convenient from a construction perspective, or both.

JB Rebar Couplers are used for joining rebars with full tension capacity. The ends of bars to be joined are provided with threads, and the bars are joined using a coupler sleeve that transfers the force on the rebar across the connection.


  • Quick and easy to install
  • Available in standard, transition, and weldable versions in sized 8 mm to 50mm.
  • High strength in tension, compression and seismic application
  • No special installation equipment needed
  • Ideal for new construction and rehab projects.


  • Cost and time savings
  • Ease of use
  • Availability
  • Strength
  • Versatility

JB-9 REBAR COUPLERS – BAR LOCK Rebar coupler, sometimes also known as mechanical splices, are used as an alternative to traditional lap splices in concrete. They transmit the rebar load directly from one rebar to another without relying on concrete bond, concrete strength, or the condition of the concrete surrounding the rebar and coupler.

  • Rebar Continuity - Rebar couplers do not rely on concrete bond and therefore they create more reliable rebar continuity.
  • Avoidance of transverse splitting forces - Many structural concrete codes of practice recommend the use of rebar couplers as an alternative to lapping, particularly for large rebar diameters where splitting and dowel action forces can be significant.
  • Reduction of rebar congestion - The use of rebar couplers will significantly reduce congestion making the placement and compaction of the concrete easier, leading to less risk of concrete segregation due to over vibration and as a result an increase in the concrete quality.
  • rebar couplers
  • Safety - On site safety during construction is paramount. The use of rebar couplers can contribute to enhancing site safety, on site welding of rebar can be eliminated by joining prefabricated cages with rebar couplers. As well as construction site safety, rebar couplers are often seen as a safer alternative to lapping as do not rely on concrete bond and therefore they create more reliable rebar continuity.
  • Ease of construction - The safety advantages of rebar couplers do not come at the expense of constructability. In fact, the use of rebar couplers can make on or off-site construction easier and faster as well as safer. Prefabricated rebar cages can be easily connected on site making on-site welding of rebar unnecessary. Individual concrete elements and construction joints can be joined without the need to drill through shuttering. The use of couplers allows for the face of concrete elements to remain smooth during construction, making construction easier and faster.
  • Ease of construction
  • Reduction in steel use - The use of rebar couplers reduces steel consumption and can therefore be an environmentally friendly and more sustainable option than lapping. The steel saved is equivalent to the lap length.
  • reduction in steel use
  • Seismic use - Mechanical rebar couplers do not rely on rebar bond with the concrete in order to transfer the load from one bar to the other and are therefore seen as a safer option to lap splicing in seismically designed structures provided they are a full capacity “bar break” system. If conventional lap splicing is employed, the seismic design of reinforced concrete structures will often exacerbate reinforcement congestion problems. In addition, the significant increase in lap lengths and other codified detailing requirements can lead to over-reinforced concrete and a potential for non-ductile, brittle behavior at the lap splice region due to the concentration of stresses at both ends of the lap, inadvertently altering the elements deformation capacity. In such cases the use of mechanical rebar couplers is therefore seen as a distinct advantage.

lap splices

mechanical splices

JB Engineering make Rebar Couplers create a continuity of reinforcement which is not reliant on the quality or integrity of the concrete. Their use creates less rebar congestion, more convenient and often safer site practice as well as reducing the amount of steel used, approximately 25% steel cost is saved in any project/s. While different performance levels exist for rebar couplers, a guaranteed “bar break” coupler means that there will ultimately be no brittle failure in a ‘beyond design” event and the full ductility of the rebar will be maintained, a feature which is recommended in safety critical applications or if the structure could be subject to impact damage or a seismic event. Jb Rock Bolts are the largest manufacturers, suppliers and exporters of all types of Self Drilling Anchor Bolt System in India.

JB Engineers Offers Self Drilling Anchors in variants of R25, R32, R38, R51 and T76 and their accessories including the Anchor Nut, Anchor Plate, Anchor Couplers and Drilling bits.

mechanical splices


weldable rebar coupler


Weldable couplers provide a quick and easy solution for connecting reinforcing steel bar (rebar) to structural steel sections or plates. The coupler is internally taper threaded on one end with the other end or exterior surface prepared for welding.

mbt rebar coupler


A Steel Rebar Coupler is used to couple or joins two pieces of steel together in the building. Steel coupler consists of a sleeve that is threaded into which the bars to be joined can be screwed into. The coupler is built as screw connection reinforcement on a framework of working joints in concrete

threaded rebar coupler


Tapered Thread Rebar Couplers are suitable for the majority of applications which require the joining of rebars.They are normally supplied fitted to the end of the threaded bar and require only the engagement and tightening of the adjoining bar on site using a calibrated torque wrench.

stainless steel rebar coupler


MBT Rebar Couplers require neither bar end preparation to form threads nor bar rotation to effect installation. The bars are supported within the coupler by two serrated saddles. As a series of lockshear bolts are tightened to a predetermined torque, they are embedded into the bar.

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