Bumper

The bumper can reduce the damage due to shocking to drill bit, drilling tool and surface drilling tool so that the purpose of raising drilling speed and of reducing drilling cost shall be reached.

Parameters

Type	OD	ID	Max. stroke	Max. torque	Max. bit weight	Tensile load	Pull-down overallength	Thread conn.
Type	mm	mm	mm	KN.m	KN	KN	mm	Thread conn.
SJ121B	121	38	120	10	200	1000	5300	31/2 REG
SJ160B	160	45	120	15	340	1500	5252	NC46
SJ178B	178	57	120	15	400	1500	5350	NC50
SJ203B	203	64	120	20	480	1960	5853	65/8 REG
SJ229B	229	71	120	20	560	1960	5900	75/8 REG

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