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We supply series of API 5CT &5B casing and tubing couplings with specification as follows: Casing coupling: A. Size (OD): 41/2 5 51/2 65/8 7 75/8 85/8 95/8 103/4 113/4 133/8 16 185/8 20 B. grade of steel: J55 K55 N80 L80 P110 C. Type of end finish: STC, LTC, BTC, EUE, NUE, Plain End Tubing coupling: A . Size (OD): 23/8 27/8 31/2 4 41/2 B grade of steel: H40 J55 N80 L80 P110 C. API Connections: Non upset (NUE), External upset (EUE), Round thread (8RD and 10RD) D. Special Clearance Couping of tubing (EUE) a). size;2 3/8, 2 7/8 ,3 1/2 b). grade of steel:J55,N80,L80 E. Special Bevel Couping sucker rod coupling API (classT and SM): 1) Material: seamless alloy steel 2) Standard: API Spec 11B 3) Class: T SM 4) Main specification: 5/8", 3/4", 7/8", 1", 1 1/8" 5). Coupling classification: T grade sucker rod coupling: Size: 5/8-3/4;3/4-7/8;7/8-11-1-1/8 Surface Hardness: HRC50-65 SM grade sucker rod coupling Size: 5/8, 3/4, 7/8, 1, 1 1/8 inches. Surface Hardness of Spray Metal Coupling: HRC50-65 E-mail:limeijing1984#live,cn MSN:limeijing1984#live,cn TEL: 86-0546-8300217 FAX:86-0546-8300078 Http:english,landdrill,com,cn
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