DSI-Mining Australia > Products > Rock and Roof Bolts > DSI Hollow Bolt

Hollow Bar Bolt - Self Drilling Bolt

Physical Properties

Technical Data	Unit	R25N	R32L	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Outer Diameter	mm	25	32	32	32	38	51	51	76	76
Average Inner Diameter	mm	14	22	18.5	15	19	36	33	51	45
Average Cross Sectional Area	mm²	290	340	430	520	770	890	1070	1900	2500
*Ultimate Load ^1**	kN	200	220	280	360	500	550	800	1600	1900
*Yield Load ^1**	kN	150	180	230	280	400	450	630	1200	1500
*Average Tensile Strength ^1**	N/mm²	690	650	650	690	650	620	750	840	760
*Average Yield Strength ^1**	N/mm²	520	530	530	540	520	510	590	630	600
Weight	Kg/m	2.3	2.7	3.4	4.1	6.1	7.0	8.4	15.0	19.7
Thread Standard	-	ISO 10208					ISO 1720		T72 ^*2
Steel Grade	-	Acc. to. EN 10083-1
Delivery Lengths	-	1m, 2m, 3m, 4m, 6m

*1 The ultimate load and yield load capacity are measured values. The tensile-/yield strengths are calculated average values.
*2 Internal standard.

General Features

The main advantages of the DSI Hollow Bar are:
Fast drilling and placing due to drilling, anchor installation and grouting in a single operation.
Neither separate anchor installation nor removal of casing and drill rods.
Similar installation methods for all ground conditions.
Choice of drill bits for different ground conditions.
The hollow core not only serves for flushing with air or water during drilling, but also for grouting the anchor tendon.
Flexibility in length by using couplers.
Ability to work with small drill rigs without casing in restricted headroom conditions.
Accommodation of needs for enhanced protection against corrosion upon request.
The accepted high standard of quality control from production stage to installation of the DSI Hollow Bar Anchors ensures consistent quality.
The DSI Hollow Bar Anchor has an advantage in all applications where normally cased drilling is required.
The DSI Hollow Bar Anchor System allows for anchoring in both cohesive and noncohesive ground, even under limited space conditions.

Standard Lengths & Packaging

Standard lengths available include 2.0m, 3.0m, 4.0m, and 6.0m
Standard bundles of 50, custom packaging available on request.

Notes

DSI's Mining Products Division is quality assured to ISO 9001:2000, Registration No.QAC/R61/0315

PRINTED December 2006: All dimensions, weights, quantities and specifications are those applicable at the time of publication and may be amended from time to time.