Rope Thread Self Drilling Hollow Bar

Rope thread self drilling anchor bar

Rope/ R thread was firstly invented by MAI in 1960s to solve the low construction speed on complicated underground works. R thread is designed and produced according to ISO 10208 (R25, R32, R38) and ISO 1720 (R51). The thread is usually left hand.

R thread anchor bar can be connected and installed quickly in the loosing or collapsing stratums, which could be drilling and grouting in one step.

Rope Threaded Hollow Bars

Thread Profile: All rope thread, commonly referred to as fully rope threaded, continuously threaded. The Rope Thread is according to ISO 10208

Steel Material: C45E/S460NH

Surface Treatment: Galvanized or Epoxy coating when necessary.

Others: Chamfered, stamped or color coded for grade identification when necessary.

ROPE THREAD IBO BARS

TECHNICAL DATA

	R25	R32L	R32N	R32S	R32SS	R38	R51L	R51N
Average Inner Diameter	12.0 mm	21.5 mm	20.5 mm	17.0 mm	15.0 mm	22.0 mm	39.0 mm	34.0 mm
Cross-Sectional Area	300 mm²	304 mm²	365 mm²	440 mm²	520 mm²	610 mm²	700 mm²	990 mm²
Yield Load	150 kN	160 kN	230 kN	280 kN	330 kN	400 kN	450 kN	630 kN
Ultimate Tensile Load	200 kN	210 kN	280 kN	360 kN	400 kN	500 kN	550 kN	800 kN
Yield Stress	500 Mpa	526 Mpa	630 Mpa	640 Mpa	630 Mpa	650 Mpa	640 Mpa	640 Mpa
Ultimate Stress	670 Mpa	690 Mpa	770 Mpa	820 Mpa	770 Mpa	820 Mpa	790 Mpa	800 Mpa
Weight	2.30 kg/m	2.60 kg/m	2.90 kg/m	3.40 kg/m	4.10 kg/m	4.75 kg/m	5.60 kg/m	7.70 kg/m
Elongation Agt	> 5%	> 5%	> 5%	> 5%	> 5%	> 5%	> 5%	> 5%