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Outer Diameter mm (A)	Inner Diameter mm (B)	Wall Thickness mm	Weight (kg)
Φ108	Φ95	6.5	16
Φ114	Φ101	6.5	17
Φ127	Φ114	6.5	19
Φ140	Φ124	8	26
Φ146	Φ127	9.5	32
Φ168	Φ149	9.5	37
Φ178	Φ159	9.5	39.5
Φ194	Φ174	10	43
Φ219	Φ199	10	51.5
Φ245	Φ225	10	58
Φ273	Φ253	10	65
Φ325	Φ305	10	78

Outer Diameter mm (A)	Outer Diameter mm (B)	Inner Diameter mm (C)	Length mm (D)
Φ108	Φ94.5	87	90
Φ114	Φ100.5	90	92
Φ127	Φ113.5	90	102
Φ140	Φ123.5	76	113
Φ146	Φ126.5	76	117
Φ168	Φ147.5	90	138
Φ178	Φ158.5	90	148
Φ194	Φ173.5	95	162
Φ219	Φ198	110	188
Φ245	Φ224	110	212
Φ273	Φ252	110	241
Φ325	Φ304	125	281

Features

• Hardening treatment of the part’s surface with longer operating life and excellent anti-wear properties
• Structural Optimisation, improving the structural strength and ease of operation
• Superior Performance, high drilling speed with stable and reliable performance

Application Range

It is suitable for drilling water wells, geothermal wells, short micropyles, medium mini-type, grouting hole of building & demand harbour projects

Outer Diameter mm (A)	Inner Diameter mm (B)	Reamed Diameter mm (C)	Inner Diameter of Casing Shoe mm (D)	Hammer Type (E)	Drill Pipe mm
108	95	118	87	DHD3.5 QL30	76
114	101	123	92	DHD3.5 QL30	76
127	114	136	102	DHD3.5 QL30	76
140	124	148	113	DHD340 QL40	76
146	127	152	117	DHD340 QL40	76
168	149	181	138	DHD350 QL50	76/89
178	159	195	148	DHD350 QL50	76/89
194	174	206	162	DHD360 QL60	89/114
219	199	234	188	DHD360 QL60	89/114
245	225	264	212	DHD380 QL80	114
273	253	308	241	DHD380 QL80	114
325	305	378	281	NUMA100 SD10	114/127

Features

• Hardening treatment of the part’s surface: with longer operating life and excellent anti-wear properties.
• Simple Structure: greatly minimize the chances of structural failure, convenient operation.
• Superior Performance: take care of both the drilling wear life and drilling efficiency.

Application Range

Suitable for drilling water wells, geothermal wells, short micropiles, medium mini-type grouting hole of building, demand harbour project.

 

Outer Diameter mm (A)	Inner Diameter mm (B)	Maximum Reamed Diameter mm (C)	Inner Diameter of Casing Shoe mm (D)	Hammer Type (E)	Drill Pipe mm
168	149	181	138	DHD350 QL50	76/89
178	159	191	148	DHD350 QL50	76/89
194	174	212	162	DHD360 QL60	89/114
219	199	235	188	DHD360 QL60	89/114
245	225	265	212	DHD380 QL80	114
273	253	293	241	DHD380 QL80	114
325	305	340	281	NUMA100 SD10	114/127
406	381	425	360	NUMA125 SD12	127

Features

• Hardening treatment of the part’s surface with longer operating life and excellent anti-wear properties.
• Structural Optimisation: improving the structural strength, easy to operate, reliable performance.
• Superior Performance: smooth with high efficiency

Application Range

It is suitable for drilling water wells, geothermal wells, short micropyles, medium mini-type grouting hole of building, demand harbour project.

 

Outer Diameter mm (A)	Inner Diameter mm (B)	Reamed Diameter mm (C)	Inner Diameter of Casing Shoe mm (D)	Max. Outer Diameter of Normal Bit mm (F)	Hammer Type (E)	Drill Pipe mm
108	95	118	80	70	DHD3.5 QL30	76
114	101	128	90	80	DHD3.5 QL30	76
127	114	141	100	90	DHD3.5 QL30	76
140	124	154	110	98	DHD340 QL40	76
146	127	160	114	102	DHD340 QL40	76
168	149	182	132	120	DHD350 QL50	76/89
178	159	192	142	130	DHD350 QL50	76/89
194	174	210	164	148	DHD360 QL60	89/114
219	199	235	184	170	DHD360 QL60	89/114
245	225	261	210	192	DHD380 QL80	114
273	253	293	238	219	DHD380 QL80	114/127
325	305	348	294	270	NUMA100 SD10	127
406	382	426	374	350	NUMA125 SD12	140

Features

• Hardening treatment of the part’s surface with longer operating life and excellent anti-wear properties.
• Structural Optimisation, improving the structural strength.
• Superior Performance: smooth with high efficiency.

Double Casing Drilling Tools (For Top Hammer) Application range

It can be widely used in drilling for grouting holes in projects such as cofferdam, foundation and geothermal well and etc.

Double Casing Drilling tools (For DTH Hammer) Application Range

It can be widely used in drilling for grouting holes in projects such as cofferdam, foundation and geothermal well and etc.

Outer Diameter mm (A)	Reamed Diameter mm (B)	Inner Diameter mm (C)	Thread mm (D)	Drill Rod Diameter mm (E)	Drill Bit Diameter mm (F)	Thread (G)
118	125	88	104.5	76	83	R56
133	140	108	122	76	102	R56
146	152	120	134	89	116	R78
168	172	133	146.5	114	128	R83
216	225	178	203	114	165	R102

Structure