Technical Specifications

Standards Recommending Couplers

A full mechanical connection shall develop in tension or compression, as required, at least 125% of speciﬁed yield strength of the steel bar

The only form of full strength mechanical joint for a bar in tension comprises a mechanical coupler satisfying the following criteria.

The Indian standard for Reinforcement Couplers for mechanical splices of bars in concrete

Ravimax Rolltech Couplers Specifications

Rebar Dia	16 mm	20 mm	25 mm	28 mm	32 mm	40 mm
Grade of Rebar	Fe 500	Fe 500	Fe 500	Fe 500	Fe 500	Fe 500
Internal Threading	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel
Outer Diameter (Tolerance = +/ -1mm)	25 mm	32 mm	40 mm	44 mm	50 mm	63 mm
Type of failure upon ultimate Tensile Load	Strength equivalent to parent rebar
Length of Coupler (Tolerance = + 05%	40 mm	50 mm	60 mm	69 mm	72 mm	100 mm
No of threads on rebar (Nos)	08 – 09	10 – 11	10 – 11	11 – 12	11 – 12	13 – 14
Threading Req. on rebar End mm (+/-5%mm)	20 – 22.5	25 – 27.5	30 – 33	33 – 36	33 – 36	49 – 52.5
Parallel Thread Size (Pitch)	2.50mm	2.50mm	3.00mm	3.00mm	3.00mm	3.50mm
Coupler Type as per ACI 318-2008	Type 1	Type 1	Type 1	Type 1	Type 1	Type 1