Releasing Back off Spear

Releasing back off spear is used for fishing, back off and releasing the fish. It can catch and transmit left hand torque during back off. It can instead of left hand taper taps and die collars. The function is similar to back off sub. The difference is that it doesn’t need to make up thread with fish and catch at any part internally.

Type	Size	Fishing ID	Tensile Load	Initial Pulling Force and Relevant Torque		Conn.
		mm（in）	KN	Pulling force KN	Torque N·M
DLM-T60	2 3/8	50.8(2)	330	147	4313	2 7/8REG
DLM-T73	2 7/8	57.4(2 1/4)	500	166	5799	NC31
		62(2 7/16)
		69.9(2 3/4)
		74.2(2 59/64)
		76.2(3)
		77.9(3 3/64)
DLM-T89	3 1/2	76(3)	650	166	9593	NC31
		77.9(3 3/64)
		84.8(3 11/32)
		88.3(3 31/64)
		90.1(3 35/64)
DLM-T114	4 1/2	97.2(3 53/64)	850	196	11522	4 1/2REG
		99.6(3 59/64)
		101.6(4)
		102.8(4 3/64)
		103.6(4 5/64)
DLM-T127	5	108.7(4 9/32)	860	196	12320	4 1/2REG
		112(4 13/32)
		114.1(4 1/2)
		115.8(4 9/16)
DLM-T140	5 1/2	118.6(4 43/64)	880	196	13263	NC50
	5 1/2	121.4(4 3/4)
		124.3(4 57/64)
		125.7(4 61/64)
		127.3(5 1/64)

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