Selecting the Right Bit

DTH (down-the-hole) drilling involves a drilling hammer at the bottom of a drill string, the hammer is powered by compressed air transmitted via drilling rod to drive piston and produce impact power, which is then delivered into rocks for drilling and crushing. DTH drilling can be applied in mining, quarrying, water well drilling, foundation piling, etc.

Features

1.Enhanced fatigue strength through advanced forging technology.
2.High quality carbide in optimal sizes for stable longevity.
3.Precision inlaying technology prevents carbide detachment.
4.State of the art heat treatment ensures superior hardness and wear resistance.
5.Tailored design and specialized processing for extended service life across various rock formations.

Bit Face Shape Selection

Button Shape Selection

DTH BIT WITHOUT FOOTVALVE

DHD Shank

Model	Bit shank	L	φ	Spline	Air hole	Rec.hole size(mm)
JS3.5B	BR33	165	54	7	2	90-105
JS3.5D	DHD3.5	181	54.6	8	2	90-105
JS4H	DHD340	209	65	8	2	105-130
JS5H	DHD350	260	84	8	2	140-152
JS6H	DHD360	308	101.5	8	2	152-190
JS8H	DHD380	350	128.5	10	2	203-245
TSK12H	DHD112	490	183	8	3	305-380

SD Shank

Model	Bit shank	L	φ	Spline	Air hole	Rec.hole size(mm)
JS4S	SD4	260	67	8	2	105-130
JS5S	SD5	258	82.5	8	2	140-152
JS6S	SD6	324	102	8	2	152-190
JS8S	SD8	321	118	8	2	203-245
JS10S	SD10	355.8	164.5	8	2	245-305
JSK12S	SD12	470	185.5	8	3	305-380

MISSION Shank

Model	Bit shank	L	φ	Spline	Air hole	Rec.hole size(mm)
JS3.5M	MISSION35	225	55	8	2	90-105
JS4M	MISSION40	228	68	12	2	105-130
JS5M	MISSION50	260	82.5	12	2	140-152
JS6M	MISSION60	231	106.5	12	2	152-190
JS8M	MISSION80	329	128.5	12	2	203-245

QL Shank

Model	Bit shank	L	φ	Spline	Air hole	Rec.hole size(mm)
JS4X	QLX40	209.5	69	12	2	105-130
JS5L	QL50	240	88.5	12	2	140-152
JS6L	QL60	253	106	12	2	152-190
JS8L	QL80	331	136	16	2	203-245
TK12L	QL120	492	208.5	12	3	305-380

DTH BIT WITHFOOT VALVE

DHD Shank

Model	Bit shank	L	中	L1	φ1	Spline	Air hole	Rec.hole size(mm)
JH3.5D	DHD3.5	181	54.6	54.6	24.5	8	2	90-105
JH4H	DHD340	209	65	59	27	8	2	105-130
JH5H	DHD350	260	84	56	35	8	2	140-152
JH6H	DHD360	308	101.5	55	38	8	2	152-190
JH8H	DHD380	350	128.5	51	50.6	10	2	203-245
JK12H	DHD112	490	183	52.2	63.2	8	3	305-380

SD Shank

Model	Bit shank	L	中	L1	φ1	Spline	Air hole	Rec.hole size(mm)
JH4S	SD4	260	67	54	26	8	2	105-130
JH5S	SD5	258	82.5	54.5	32	8	2	140-152
JH6S	SD6	324	102	53	36.4	8	2	152-190
JH8S	SD8	321	118	57	41	8	2	203-245
JH10S	SD10	355.8	164.5	60.3	56	8	3	245-305
JK12S	SD12	470	185.5	48	63.2	8	3	305-380

QL Shank

Model	Bit shank	L	φ	L1	φ1	Spline	Air hole	Rec.hole size(mm)
JH4X	QLX40	209.5	69	58	32.2	12	2	105-130
JH5L	QL50	240	88.5	52	38.5	12	2	140-152
JH6L	QL60	253	106	59	46	12	2	152-190
JH8L	QL80	331	136	54	54.6	16	2	203-245
TK12L	QL120	492	208.5	52.2	71.5	12	3	305-380

LARGE DIAMETER DTH BIT

Features
◆Military grade special steel minimizes breakage and cracking failures.
◆Advanced forging process enhances the fatigue strength of the drill bit steel body.
◆Ultrasonic and magnetic particle flaw detection identify and eliminate material and forging defects, reducing potential quality issues during drilling.
◆Larger carbides extend the service life of the drill bit
◆CNC machining ensures precise dimensions of the drill bit.
◆Specially designed foot valve provides high strength and toughness, ensuring reliable performance.
◆Shock absorbing plastic pin enhances the service life of the shank spline.

NumaShank

Model	Bit shank	L	φ	L1	φ1	Spline	Air hole	Rec.hole size(mm)
JH10N	NUMA100	375	165	53	54	10	3	245-305
TK12N	Numa120	490.5	191	56.5	75.6	12	3	305-380
TK12HN	Numa125	491	209	54	74.5	10	3	305-380
TK14	TK14	520	235	/	/	10	3	400-500
TK18	NUMA180	527.5	297	80.7	93.2	12	6	500-600
TK24	TK24	560	380	80	118.2	14	6	600-800
TK28	TK28	560	430	80	118.2	16	6	800-1150