Our drilling collars were developed to provide the market with more reliable technology and more hoisting performance. Manufactured strictly according to API Spec7-1 standard with material of AISI 4145 Mod. Multiple choices, such as slick drill collars, spiral drill collars, non-magnetic drill collars and other types. Included but not limited by the advantages mentioned, ZT series drilling collars might be your best choice.
General Features
• Manufactured according to API 7-1
• Suitable for onshore or offshore rigs
• Suitable for cold area and desert environment

Main Specifications
Size: 3-1/8” – 11” (79.4 mm – 279.4 mm)

Parameters

Model	D		d		L (mm)	DF (mm)	Bending Strength ratio	Drill Collar
	mm	in	mm	in				Nominal size
ZT 3-1/8	79.4	3-1/8	31.8	1-1/2	9,150	76.2	2.57:1	NC23-31
ZT 3-1/2	88.9	3-1/2	38.1	1-1/2	9,150	82.9	2.42:1	NC26-35 (2-3/8IF)
ZT 4-1/8	104.8	4-1/8	50.8	2	9,150	100.4	2.43:1	NC31-41 (2-7/8IF)
ZT 4-3/4	120.7	4-3/4	50.8	2	9,150	114.7	2.58:1	NC35-47
ZT 5	127	5	57.2	2-1/4	9,150	121	2.38:1	NC38-50 (3-1/2IF)

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