API 7-1 AISI4145h Material Drill Collar for Oil & Gas Downhole Drilling

• Customization: Available
• After-sales Service: After Sales Service
• Warranty: 6 Months
• Model NO.: 5" drill collar
• Manufacturing Process: CNC Milling
• Surface Treatment: Painting
• Operation Pressure: 3000 Psi
• Material: Alloy
• Transport Package: by Bulk
• Specification: 5"
• Trademark: ZX
• Origin: China
• HS Code: 8481431000
• Production Capacity: 1000 PCS Per Month

Product Description

Drill Collars

Technical Features:
The Drill Collars are made of AISI 4145 H or 4145 H Modified alloy steel. Bores are trepanned from one direction with no mismatch. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe.

When inquiry or order, please specify:
- Type (slick or spiral grooved)
- Outside and inside diameters and overall length - Connection size and type
- API Stress relief groove on pin and box ends
- Cast or pressed steel thread protectors
- Elevator recess or not 
- Hard-banding or not 
- Non-magnetic or

DATA SHEET FOR SLICK TYPE DRILL COLLAR

Size (in)	Bore (in)	Connection	Weight (lb)		Size (in)	Bore (in)	Connection	Connection
			30 ft	31 ft				30 ft	31 ft
3 1/8	1 1/4	NC23	651.2	673.2	6 3/4	2 1/4	4IF	3132.8	3207.6
3 1/4	1 1/4	NC23	715	739.2	7	2 13/16	41/2IF	3258.2	3366
3 1/2	1 1/2	2 3/81F	787.6	814	7 1/4	2 13/16	41/2IF	35354	3654.2
4 1/8	2	2 7/81F	1031.8	1067	7 1/2	2 13/16	41/2IF	3830.2	3957.8
4 1/4	2	2 7/81F	1119.8	1157.2	7 3/4	2 13/16	6 5/8 Reg	4129.4	4268
4 1/2	2	2 7/81F	1287	1331	8	2 13/16	6 5/8 Reg	4439.6	4587
4 3/4	2 1/4	NC35	1383.8	1430	8 1/4	2 13/16	6 5/8 Reg	4769.6	4928
5	2 1/4	31/21F	1575.2	1628	8 1/2	2 13/16	6 5/8 Reg	5093	5262.4
5 1/4	2 1/4	3 1/21F	1784.2	1843.6	8 3/4	2 13/16	6 5/8 Reg	5440.6	5621
5 1/2	2 1/4	31/21F	1991	2057	9	3	7 5/8 Reg	5695.8	5885
5 3/4	2 1/4	4FH	2219.8	2294.6	9 1/4	3	7 5/8 Reg	6067.6	6270
6	2 1/4	NC44	2450.8	2532.2	9 1/2	3	7 5/8 Reg	6430.6	6644
6 1/4	2 1/4	41F	2692.8	2783	9 3/4	3	7 5/8 Reg	6815.6	7040
6 1/2	2 1/4	41F	2948	3047	10	3	8 5/8 Reg	7207.2	7447