Rebar coupler sizes

Rebar Coupler Sizes

Rebar coupler sizes refer to the range of couplers manufactured to match different TMT bar diameters used in reinforced concrete structures. Selecting the correct size is critical because the coupler must align with the bar diameter, fit-up length, and splice performance requirements. Rebar couplers are commonly specified by the nominal bar size in millimeters, and the same project may use multiple sizes across foundations, columns, beams, shear walls, and slab reinforcement. A well-matched coupler size helps achieve consistent load transfer, reliable alignment, and quicker site execution compared to conventional lap splicing.

Working Principle & Process Flow

Coupler sizing is based on the rebar diameter and the splice type. In mechanical bolted couplers, the bar ends are inserted into a sleeve and locked using shear bolts that clamp the ribs of the TMT bar. In threaded couplers, the bar ends are prepared with compatible threads and then joined through a sleeve. In both cases, performance depends on correct diameter matching, adequate embedment, and proper installation torque or tightening sequence. A practical size selection process typically starts from the bar schedule, checks the required splice category, and then chooses the corresponding coupler size for each bar diameter used on site.

Applications & Benefits

Key Features

Common Rebar Coupler Size Range

In most construction projects, rebar coupler sizes are supplied to match widely used TMT bar diameters. Typical size coverage includes 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm, and 40 mm for mainstream RCC applications. For projects that require smaller reinforcement, 10 mm couplers may be used, while heavy infrastructure may demand higher diameters depending on design. Reducer couplers are used when two different bar sizes must be joined, such as 20 mm to 16 mm or 25 mm to 20 mm, based on engineering approval and splice detailing.

Maintenance & Safety Tips

FAQs — Rebar Coupler Sizes

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