Large-Diameter Drill bit

Characteristics of Large-Diameter Drill Bits

The bit body is made of military-grade special steel, featuring low failure rates of breakage and cracking.
High-quality forging process enhances the fatigue strength of the bit body.
Ultrasonic and magnetic particle flaw detection on the bit body eliminates material and forging defects, reducing quality accidents during use.
Enlarged alloy teeth of the bit improve the service life of the alloy.
CNC machining of the bit body ensures its processing accuracy.
The specially designed tail pipe has high strength and good toughness, guaranteeing the bit’s performance.
The spline of the drill bit is matched with shock-absorbing buffer strips to extend the spline’s service life.

Types of tubeless down-the-hole drill bits							tailpipe down-the-hole drill bits									Reverse cycle drill bit
No.	L	Φ	splines number	range	Common drill bits	Corresponding model	No.	L	Φ	L1	Φ1	splines number	range	Common drill bits	Corresponding model	No.	L	φ1	B1	B2	φd1	φd2	splines number	range	Common diameter
JS4L	279.5	68	10	105-130	115	QL40	JH4S	260	67	54	26	8	105-130	115	SD4	0#	225	78	14.3	14.6	77	68.2	8	115-130	115
JS5L	240	88.5	12	135-152	140	QL50	JH5S	258	82.5	54.5	32	8	135-152	140	SD5	2#	225	84	14.25	14.55	79.4	69.2	8	121-140	124
JS6L	253	106	12	155-190	165、178	QL60	JH6S	324	102	53	36.4	8	155-190	165、178	SD6	4#	277	87	15.9	16.5	86.8	71.5	8	127-145	133
JS8L	331	136	16	203-254	203、216、 240	QL80	JH8S	321	118	57	41	8	203-254	203、 216、240	SD8	5#	260.5	95.2	18.8	19.5	95	80	8	140-155	140
JS3.5D	181	54.6	8	90-110	105	DHD3.5	JH10S	355.8	164.5	60.3	56	8	245-305	254、305	SD10
JS4H	209	65	8	105-130	115	DHD340	JH12S	470	185.5	48	63.5	8	305-400	305、311	SD12
JS5H	260	84	8	135-152	140	DHD350	JH4L	279.5	68	59	32	10	105-130	115	QL40
JS6H	308	101.5	8	155-190	165、178	DHD360	JH5L	240	88.5	52	38.5	12	135-152	140	QL50
JS8H	350	128.5	10	203-254	203、216、 240	DHD380	JH6L	253	106	59	46	12	155-190	165、178	QL60
JS10N	375	165	10	245-305	245/305	NUMA100	JH8L	331	136	54	54.6	16	203-254	203、216、240	QL80
JS4M	228	68	12	105-130	115	MISSI on 40	JH3.5D	181	54.6	54.6	24.5	8	90-110	105	DHD3.5
JS5M	260	82.5	12	135-165	140	MISSI on 50	JH4	209	65	59	27	8	105-130	115	DHD340
JS6M	231	106.5	12	155-203	165、178	MISSI on 60	JH5	260	84	56	35	8	135-152	140	DHD350
JS8M	329	128.5	12	203-254	203、216、 240	MISSI on 80	JH6	308	101.5	55	38	8	155-190	165、178	DHD360
							JH8	350	128.5	51	50.6	10	203-254	203、 216、240	DHD380
							JH12	490	183	52	63.5	8	305-400	305、311	DHD112
							Large-diameter drill bit
							TK12	490.5	191	56.5	75.6	12	305-400	311
							TK14	520	235			10	400-508	500
							TK18	527.5	183	80.7	63.45	12	500-650	600
							TK24	560	380	80	120	14	650-800	800
							TK28	476	464.5	77	114	16	800-1000	1000