CMP
Hollow Bar System

CMP
Stainless Hollow Bar System

CMP
Hot DIP Galvanized Hollow Bar System

CMP
TDG Hollow Bar System

CMP
Epoxy Coating Hollow Bar System

Hollow Bar

Accessories

Hollow Bar

CMP Hollow Bar System is a fully threaded hollow core bar that is initially a server as a drill rod with a lost bit, and later, once grouted in, it becomes an anchor tendon that can be stressed and locked off with a nut.

CMP hollow bar system provides the optimal solutions for nailing, bolting, micro piling and as ground anchors in difficult ground and rock conditions.

T thread

R thread

Special and Mixed

T thread self drilling anchor bolt system is composed by hollow rock bolt, anchor nut, anchor plate, anchor coupler, drill bit, centralizer, and the hollow anchor bars can be cut and lengthened by coupling on request.

Advantages:

★ Drilling, anchors installation and grouting are in one single operation, it is easy and fast to install.

★ An economic alternative to anchors installed with cased drilling.

★ Small workspace needed.

★ Simple systems, low requirements on personnel.

★ No separate anchor installation or removal of casing and drill rods, increase productivity.

★ Easy stressing operation.

★ Flexible in length by using couplers.

★ Choice of drill bit for different ground conditions.

Bar Size	T30N	T40L	T40N	T52N	T60N	T76L	T76N	T76M	T76S	T103N	T103S
Nominal outer diameter(mm)	30	40	40	52	60	76	76	76	76	103	103
Nominal Inner diameter(mm)	13	24	20	30	38	54	49	47	44	80	57
UItimate load(kN)	320.00	540.00	660.00	929.00	1,000.00	1,200.00	1,600.00	1,700.00	1,900.00	2,300.00	3,700.00
Yield load(kN)	260.00	425.00	525.00	730.00	800.00	1,000.00	1,200.00	1,300.00	1,500.00	1,800.00	2,670.00
Elongation A5(%)	≥6.00
Nominal weight (kg/m)	3.10	5.20	6.00	9.00	10.20	12.90	16.30	17.20	19.30	25.00	40.00
Thread (left-hand)	CMP Internal standard and based on ISO 10208 and 1720 etc.
Steel grade	ASTM A519-035140/EN 10083-141Cr4
Hardness(HB)	240-310
Delivery lengths (m)	1m,2m,3m,4m.Other length can be special order

R thread self drilling anchor bolt system is composed by hollow rock bolt, anchor nut, anchor plate, anchor coupler, drill bit, centralizer, and the hollow anchor bars can be cut and lengthened by coupling on request.

Advantages:

★ Drilling, anchors installation and grouting are in one single operation, it is easy and fast to install.

★ An economic alternative to anchors installed with cased drilling.

★ Small workspace needed.

★ Simple systems, low requirements on personnel.

★ No separate anchor installation or removal of casing and drill rods, increase productivity.

★ Easy stressing operation.

★ Flexible in length by using couplers.

★ Choice of drill bit for different ground conditions.

Bar Size	R25N	R32L	R32N	R32S	R32SS	R38N	R51L	R51N
Nominal outer diameter(mm)	25	32	32	32	32	38	51	51
Nominal inner diameter(mm)	13	21	20	18	15	24	35	33
UItimate load(kN)≥	200.00	250.00	280.00	360.00	405.00	500.00	550.00	800.00
Yield load(kN)≥	150.00	190.00	230.00	280.00	300.00	400.00	450.00	630.00
Elongation A5(%)≥	≥6.00
Nominal weight (kg/m)	1.90	2.40	2.70	3.40	3.80	4.70	5.90	7.40
Thread (left-hand)	CMP Internal standard and based on ISO 10208 and 1720 etc.
Steel grade	ASTM A519-035140/EN 10083-141Cr4
Hardness(HB)	230-300
Delivery lengths (m)	1m,2m,3m,4m.Other length can be special order

Composed by hollow rock bolt, anchor nut, anchor plate, anchor coupler, drill bit, centralizer, and the hollow anchor bars can be cut and lengthened by coupling on request.

Advantages:

★ Drilling, anchors installation and grouting are in one single operation, it is easy and fast to install.

★ An economic alternative to anchors installed with cased drilling.

★ Small workspace needed.

★Simple systems, low requirements on personnel.

★ No separate anchor installation or removal of casing and drill rods, increase productivity.

★ Easy stressing operation.

★ Flexible in length by using couplers.

★ Choice of drill bit for different ground conditions.

Bar Size	R38/15	R51/28	R63/43	R76/56	T103/83	T103/78	T103/51	T130/92	T130/60	T135/75
Nominal outer diameter(mm)	38	51	63	76	103	103	103	130	130	135
Nominal Inner diameter(mm)	23.00	34.00	47.00	56.00	83.00	79.00	52.00	94.00	60.00	82.00
UItimate load(kN)	530.00	840.00	1,160.00	1,380.00	1,600.00	1,980.00	3,660.00	4,003.00	7,940.00	5,400.00
Yield load(kN)	425.00	690.00	930.00	1,100.00	1,280.00	1,590.00	2,670.00	3,203.00	5,250.00	4,320.00
Elongation A5(%)	≥6.00
Nominal weight (kg/m)	5.00	8.00	10.70	14.60	10.20	24.20	43.30	48.50	92.30	65.90
Thread	CMP Internal Standard;Left Hand or Right Hand
Steel grade	ASTM A519-035140/EN 10083-141Cr4				API 5CT Grade J55,similar to 28Mn6 of EN10083-1
Steel grade(KSl)	96	98	99	86	74	75	71	75	65	75
Hardness(HB)	240-310
Delivery lengths (m)	1m,2m,3m,4m.Other length can be special order

Accessories

The CMP hollow rod system is a fully threaded hollow rod that was originally a drill rod with a missing drill bit. Later, once grouted, it becomes an anchor bar that can be stressed and locked with a nut.

The CMP hollow rod system provides the best solution for nailing, anchoring, micro piling, and serving as a ground anchor in difficult ground and rock conditions.

It mainly includes nuts, drill bits, plates, and couplers.

Drill Bits

Coupler

Nut

Plate

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Standard drill bit with hardened cross cut profile, manufactured from steel.

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For general applications with loose to medium ground conditions.

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The coupler of the self drilling hollow bar is a coupler with internal threads, which has a termination position in the middle and is matched with the hollow bar

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Advantages:

★ Equal strength to the hollow bar

★ The hollow body can be arbitrarily extended for easy drilling

★ Standard thread, suitable for various types of CMP bars

Type	P/N	Length(mm)	Diameter(mm)	Weight(Kg/pcs)
R18N	183010	150	36	0.25
R22N	223010	110	32	0.32
R25N	253010	150	36	0.62
R28N	283010	150	36	0.52
R32N/S	323011	145	42	0.77
	323010	160	42	0.80
	323012	190	42	0.95
R38N	383010	180	51	1.40
R38N	383011	200	51	1.60
R51L/N	513010	200	63	1.80
	513260	260	63	2.43
	513270	270	63	2.54
	513280	280	63	2.63
T30	303010	105	42	0.50
T40	403010	160	57	1.60
T76L/N/S	763010	220	97	4.86
	763011	200	95	4.60
	763012	220	95	4.70
T103N	103N3010	220	121	6.00
T103S	103S3010	260	133	12.00

For more models, please contact us

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Nut is a device with internal threads that transfers the anchoring force of the hollow anchor rod body to the cushion plate and locks the cushion plate.

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One end of the nut is machined with a curved surface, flat surface, or spherical shape.

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Advantages:

★ Equal strength to the hollow bar

★ Standard thread, suitable for various types of CMP bars

Type	Beveled Nut & Hex Nut
Type	P/N	SW(mm)	Length(mm)	Weight(Kg/pcs)
R18N	181010/181012	36	35	0.24
R22N	221010/221012	36	35	0.20
R25N	251010/251012	41	41	0.29
R25N	251010N/251012N	41	62	0.42
R28N	281010/281012	50	41	0.33
R32N/S	321010/321012	46	45	0.45
R32N/S	321010N/321012N	46	65	0.60
R38N	381010/381012	50	60	0.50
R38N	381010N/381012N	50	80	0.63
R51L/N	511010/511012	75	70	1.60
R51L/N	511010N511012N	75	90	2.00
T30	303010/303012	46	41	0.35
T40	403010/403012	60	68	0.95
T76L/N/S	761010/761012	100	80	2.65
T103N	103N1012	125	90	3.70
T103S	103S1012	125	130	5.40

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Type	Domed Nut
Type	P/N	SW(mm)	Length(mm)	Weight(Kg/pcs)
R18N	181011	36	35	0.25
R22N	221011	36	35	0.21
R25N	251011	41	41	0.30
R28N	281012	50	41	0.34
R32N/S	321011	46	46	0.45
R32N/S	321011S	46	65	0.60
R38N	381011	55	65	0.82
R51L/N	511011	75	70	1.85
R51L/N	511011100	75	100	2.20
T30	303010	46	41	0.38
T40	403010	60	68	1.00
T76L/N/S	761012	100	85	2.85
T103N	103N1012	125	90	4.10
T103S	103S1012	125	120	5.90

For more models, please contact us

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The cushion plate is divided into flat and spherical styles.

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Generally, equal strength cushion plates and nuts are used to evenly transfer the stress of deep surrounding rock to the surrounding rock, achieving the goal of mutual support between the surrounding rock and anchor rods.

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Advantages:

★ Easy to process and produce, with a simple structure

★ Customizable, convenient for construction

Type	P/N	Size(mm)	Weight(Kg/pcs )
R25N	25215008	150x150x8	1.36
	25215010	150x150x10	1.76
	25220010	200x200x10	3.08
	25220012	200x200x12	3.70
R32N/S	32215008	150x150x8	1.32
	32220010	200x200x10	3.06
	32220012	200x200x12	3.67
R38N	38220010	200x200x10	3.03
	38220012	200x200x12	3.67
	38220014	200x200x14	4.30
R51L/N	51220010	200x200x10	3.03
	51220012	200x200x12	3.67
	51230025	300x300x25	17.10
T30	30215008	150x150x8	1.32
	30220010	200x200x10	3.06
	30220012	200x200x12	3.67
T40	40220010	200x200x10	3.01
T40	40220012	200x200x12	3.62
T52	40220010	200x200x12	3.67
T52	40220012	300x300x25	17.10
T76L/N/S	76225040	250x250x40	17.80
T76L/N/S	76225060	250x250x60	26.70
T103N/S	1032400501	400x400x50	57.80
T103N/S	1032400502	330x330x60	46.50

For more models, please contact us

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