Steel Self-Drilling Rock Anchor Bolt Drill Bit Hollow Core Steel Bar

• Customization: Available
• After-sales Service: Available
• Warranty: Available
• Standard: AISI, GB, ASTM
• Surface Treatment: Galvanized
• Manufacturing Process: Forging
• Material: Cast Steel
• Application: Deep Foundation Use
• Field: Coal Mining
• Type: Carbon Steel Bar
• Processing Service: Cutting
• Size: R25/R32/R38/R51/T30/T40/T52/T76/T108/T111/T130...
• Finished: Galvanized,Epoxy
• Usage: Mine,Tunnel,Slope,Foundation Pit
• Transport Package: Carton Box
• Specification: customised
• Origin: China
• HS Code: 73082000
• Production Capacity: 100, 000 Ton Per Year
• Package Size: 11.00cm * 11.00cm * 23.00cm
• Package Gross Weight: 300.000kg

Product Description

Self drilling anchor bolt system is mainly used for tunnel and underground engineering, slope engineering, ground and foundation engineering. It can be used for pre-construction support and can effextively enhance the stability of soil and rock mass.

The Self-Drilling bolt is a fully threaded hollow bar that initially serves as a drill rod, utilizing a lost bit. The thread is made to comply to ISO 10208. For use in unconsolidated ground or other difficult ground conditions.

Range of applications:
• micropiles for foundation underpinning (anchors with larger diameter)
• anchors against uplift
• anchors for protection of rock slopes and building pits
• anchors for stabilization of soil slopes (soil nailing)
• anchors for stabilization of embankments
• anchors for protection of retaining structures
• drains (drainage of water)


• Excellent for spiling (fore-poling)
• Bolt is drilled in and grout is pumped through the center hole with pumpable resin or cement grouts
• The couplers are designed to exceed the ultimate load of the bar by 20%. The couplers are designed to minimize the loss of drill energy
• Several drill bits are available. Most widely used is the EXX Tungsten carbide chisel bit
• Standard length is 3 m (9 ft -10 ft) - Longer lengths are available: 4 m, 6 m
• Galvanized option under ASTM A123

R-Thread Hollow anchor Bar
Size	Outer Dia.(mm)	Ultimate Lad(kN)	Yield Load(kN)	Weight(kg/m)
R25N	25	200	150	2.35
R32l	32	210	160	2.83
R32N	32	280	230	3.50
R32S	32	360	280	4.00
R32L	32	210	160	2.50
R32N	32	280	230	2.95
R32S	32	360	280	3.50
R32S1	32	405	320	4.00
R32L1	32	250	190	2.60
R32N	32	280	230	2.83
R38N	38	500	400	5.50
R38N	38	500	400	4.95
R38S	38	500	450	5.90
R51L	51	580	450	6.75
R51N	51	800	630	9.00
R51L	51	550	450	6.20
R51L1	51	660	540	6.75
R51N	51	800	630	8.20
R51S	51	925	740	9.25
T-Thread Hollow anchor Bar
T30L	30	220	180	2.90
T30N	30	260	220	3.35
T30S	30	320	260	3.60
T30S	30	320	260	3.35
T40N	40	539	430	6.20
T40S	40	660	525	7.20
T40N	40	539	430	5.70
T40S	40	660	525	6.80
T52N	52	929	730	10.20
T52N	52	929	730	9.70