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Drop Center Drill Bit

Product name:60R32 retrac drop center drill bit
Thread: R32
Diameter: 60mm
Length:120mm
No.×Buttons Dia.:5*10mm,8*10mm
Skirt Design: retrac
Weight: 1.9kg
Carbide Design: spherical
Face Design:drop center
Carbide Brand and Grade :ZCC/YK05
Steel grade :45CrNiMoVA

Key words：

Thread Button Bit

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Product Details

Description

Drop center drill bits are mainly suitable for medium hard rock, low abrasiveness rock and integrity rock formation. This concave design has a straightening feature in the drop center, which helps the thread button bit drill straighter holes in less consolidated rock.
HENGLONG can produce various types of drop center drill bits for your choosing.one of the most important size for Drop center drill bit is thread T51.
Diameter: 89mm, 102mm, 115mm, 127mm
Skirt body: retrac, and normal
Face type: flat,Drop Center
Carbide shape: spherical, ballistic, Parabolic buttons
Used in bench drilling, underground long hole drilling to match extension MF rod, MM rod heavy duty top hammer drilling tools..

Performance

HENGLONG will choose to use tungsten carbide of T6/YK05，featuring good wear-resistance and toughnes.
This type of carbide has already been proved to be the best in world and been competing with those big names worldwide for quite a long time.
Meanwhile，HENGLONG will choose to use superior steel suitable for hot insertion technology, by which the drilling bits body will hold the carbide buttons so tightly that reduce the risk of buttons’ dropping out of the holes.
In order to better resist the abrasiveness of rock, spherical shape will be a good option for the carbide if high speed is not a necessity.

Application

Drop center drill bit is mainly suitable for medium hard rock, low abrasiveness rock and integrity rock formation.

Details Form

Drill bit	Diameter		No.×button dia.			Flushing hole		Weight （kg）	HLDRLL P/N
Drill bit	mm	inch	Front	Gauge	Angle	Front	side	Weight （kg）	HLDRLL P/N
button bit	Spherical buttons
	89	3 1/2	4×13	8×13	40°	2	-	4.9	1431-89T51-413/813-45-31
	89	3 1/2	5×13	8×13	35°	2	1	4.9	1431-89T51-513/813-45-31
	89	3 1/2	3×11，2×11	6×13	35°	4	-	4.9	1433-89T51-511/613-45-31
	89	3 1/2	4×11，1×11	8×13	35°	4	-	4.9	1433-89T51-511/813-45-31
	89	3 1/2	4×13，1×13	8×13	35°	4	-	4.9	1432-89T51-513/813-45-31
	102	4	4×14	8×14	40°	2	-	5.8	1431-102T51-414/814-45-31
	102	4	6×13	8×16	35°	2	1	5.8	1431-102T51-613/816-45-31
	102	4	3×13，2×13	6×14	35°	3	1	5.2	1433-102T51-513/614-45-31
	102	4	4×13，1×13	8×14	35°	4	-	5.8	1433-102T51-513/814-45-31
	102	4	4×13，2×13	8×13	35°	4	1	5.8	1433-102T51-613/813-45-31
	115	4 1/2	6×14	8×14	35°	2	-	6.8	1431-115T51-614/814-45-31
	115	4 1/2	6×14	8×16	35°	2	-	6.8	1431-115T51-614/816-45-31
	115	4 1/2	4×13，2×13	8×14	35°	4	-	6.8	1433-115T51-613/814-45-31
	115	4 1/2	4×13，3×13	8×14	35°	4	-	6.8	1433-115T51-713/814-45-31
	115	4 1/2	4×14，2×14	8×16	35°	4	-	6.8	1433-115T51-614/816-45-31
	127	5	8×14	8×16	35°	2	1	7.5	1431-127T51-814/816-45-31
	127	5	4×16，2×13	8×16	35°	4	-	7.5	1433-127T51-616/816-45-31
	127	5	4×14，3×14	8×14	35°	4	-	7.5	1433-127T51-714/814-45-31
	Parabolic buttons
	89	3 1/2	5×13	8×13	35°	2	1	4.9	1431-89T51-513/813-45-51
	89	3 1/2	3×11，2×11	6×13	35°	4	-	4.9	1433-89T51-511/613-45-51
	89	3 1/2	4×11，1×11	8×13	35°	4	-	4.9	1433-89T51-511/813-45-51
	89	3 1/2	4×13，1×13	8×13	35°	4	-	4.9	1432-89T51-513/813-45-51
	102	4	4×14	8×14	40°	2	-	5.8	1431-102T51-414/814-45-51
	102	4	6×13	8×16	35°	2	1	5.8	1431-102T51-613/816-45-51
	102	4	3×13,2×13	6×14	35°	3	1	5.2	1433-102T51-513/614-45-51
	102	4	4×13，1×13	8×14	35°	4	-	5.8	1433-102T51-513/814-45-51
	102	4	4×13，2×13	8×13	35°	4	1	5.8	1433-102T51-613/813-45-51
	115	4 1/2	6×14	8×16	35°	2	-	6.8	1431-115T51-614/816-45-51
	115	4 1/2	4×13，2×13	8×14	35°	4	-	6.8	1433-115T51-613/814-45-51
	115	4 1/2	4×13，3×13	8×14	35°	4	-	6.8	1433-115T51-713/814-45-51
	115	4 1/2	4×14,2×14	8×16	35°	4	-	6.8	1433-115T51-614/816-45-51


Drill bit	Diameter		No.×button dia.			Flushing hole		Weight （kg）	HLDRLL P/N
Drill bit	mm	inch	Front	Gauge	Angle	Front	side	Weight （kg）	HLDRLL P/N
Retrac button bit	圆齿 Spherical buttons
	89	3 1/2	4×13	8×13	40°	2	-	5.3	1531-89T51-413/813-45-31
	89	3 1/2	5×13	8×13	35°	2	1	5.3	1531-89T51-513/813-45-31
	89	3 1/2	3×11，2×11	6×13	35°	4	-	5.3	1533-89T51-511/613-45-31
	89	3 1/2	4×11，1×11	8×13	35°	4	-	5.3	1533-89T51-511/813-45-31
	89	3 1/2	4×13，1×13	8×13	35°	4	-	5.3	1632-89T51-513/813-45-31
	102	4	4×14	8×14	40°	2	-	7.3	1531-102T51-414/814-45-31
	102	4	6×13	8×16	35°	2	1	7.3	1531-102T51-613/816-45-31
	102	4	4×13，1×13	8×14	35°	4	-	7.3	1533-102T51-513/814-45-31
	102	4	4×13，2×13	8×13	35°	4	1	7.3	1533-102T51-613/813-45-31
	102	4	4×13，1×13	8×14	35°	4	1	7.3	1533-102T51-513/814-45-31
	115	4 1/2	6×14	8×14	35°	2	-	9.8	1531-115T51-614/814-45-31
	115	4 1/2	6×14	8×16	35°	2	-	9.8	1531-115T51-614/816-45-31
	115	4 1/2	4×13，2×13	8×14	35°	4	-	9.8	1533-115T51-613/814-45-31
	115	4 1/2	4×13，3×13	8×14	35°	4	-	9.8	1533-115T51-713/814-45-31
	115	4 1/2	4×14，2×14	8×16	35°	4	-	9.8	1533-115T51-614/816-45-31
	127	5	8×14	8×16	35°	2	1	12	1531-127T51-814/816-45-31
	127	5	4×16，2×13	8×16	35°	4	-	12	1533-127T51-616/816-45-31
	127	5	4×14，3×14	8×14	35°	4	-	12	1533-127T51-714/814-45-31
	Parabolic buttons
	89	3 1/2	5×13	8×13	35°	2	1	5.3	1531-89T51-513/813-45-51
	89	3 1/2	3×11，2×11	6×13	35°	4	-	5.3	1533-89T51-511/613-45-51
	89	3 1/2	4×11，1×11	8×13	35°	4	-	5.3	1533-89T51-511/813-45-51
	89	3 1/2	4×13，1×13	8×13	35°	4	-	5.3	1632-89T51-513/813-45-51
	102	4	4×14	8×14	40°	2	-	7.3	1531-102T51-414/814-45-51
	102	4	6×13	8×16	35°	2	1	7.3	1531-102T51-613/816-45-51
	102	4	4×13，1×13	8×14	35°	4	-	7.3	1533-102T51-513/814-45-51
	102	4	4×13，2×13	8×13	35°	4	1	7.3	1533-102T51-613/813-45-51
	102	4	4×13，1×13	8×14	35°	4	1	7.3	1533-102T51-513/814-45-51
	115	4 1/2	6×14	8×16	35°	2	-	9.8	1531-115T51-614/816-45-51
	115	4 1/2	4×13，2×13	8×14	35°	4	-	9.8	1533-115T51-613/814-45-51
	115	4 1/2	4×13，3×13	8×14	35°	4	-	9.8	1533-115T51-713/814-45-51
	115	4 1/2	4×14，2×14	8×16	35°	4	-	9.8	1533-115T51-614/816-45-51
Dome bit for reaming	Spherical buttons
	152	6	2×14	18×14	35°	3	1	10.6	1441-152T51-214/1814-45-31

	Parabolic buttons
	152	6	2×14	18×14	35°	3	1	10.6	1441-152T51-214/1814-45-51




Drill rod				Length		Outer Dia.		Weight （kg）	HLDRLL P/N
Drill rod				mm	inch	mm	inch	Weight （kg）	HLDRLL P/N
Extension rod T51-Round52-T51 Flushing hole 21.5mm Wrench flat 45mm				3050	10'	52	2	45.3	23R52-T51-3050-23
				3660	12'	52	2	54.1	23R52-T51-3660-23
				4270	14'	52	2	63	23R52-T51-4270-23
				4880	16'	52	2	71.8	23R52-T51-4880-23
				5530	18'	52	2	81.2	23R52-T51-5530-23
				6095	20'	52	2	89.4	23R52-T51-6095-23

MF-rod T51-round52-T51 Flushing hole 21.5mm				1525	5'	52	2	26.2	24R52-T51/72-1525-23
				1830	6'	52	2	30.6	24R52-T51/72-1830-23
				3050	10'	52	2	48.3	24R52-T51/72-3050-23
				3660	12'	52	2	57.1	24R52-T51/72-3660-23
				4270	14'	52	2	66	24R52-T51/72-4270-23
				4880	16'	52	2	74.8	24R52-T51/72-4880-23
				5530	18'	52	2	84.2	24R52-T51/72-5530-23
				6095	20'	52	2	92.4	24R52-T51/72-6095-23


Guide tube				Length		Outer Dia.		Weight （kg）	HLDRLL P/N
Guide tube				mm	inch	mm	inch	Weight （kg）	HLDRLL P/N
Guide tube				1830	6'	76	3	42	24G76-T51/76-1830-23
D76 for bits from 89-102mm and D87 for bits from 102-127mm				3660	12'	76	3	81	24G76-T51/76-3660-23
				3660	12'	87	3 1/2	86	24G87-T51/87-3660-23


Coupling			Length		Outer Dia.		Thread	Weight （kg）	HLDRLL P/N
Coupling			mm	inch	mm	inch	Thread	Weight （kg）	HLDRLL P/N
Coupling sleeves			225	8 7/8	71	2 51/64	T51	4.6	31-T51-71-225-23
			225	8 7/8	76	3	T51	4.8	31-T51-76-225-23
			235	9 1/4	72	2 7/8	T51	4.7	31-T51-72-235-23
			235	9 1/4	77	3 1/32	T51	4.9	31-T51-77-235-23

HENGLONG workshop and Process of manufacturing

Packing and shipping

Factory

Customer visit

Production

QUALITY INSPECTION PROCESS

Product quality is one of the core links in the development and growth of Yanggu Henglong Engineering Co., Ltd. Our company has strict internal and external inspection processes to ensure the quality of our products. Our inspection process for our products is as follows.

Thread Button Bit