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1.longer service life, 2.standard :API spec 11B, 3.high quality material - details see: https://www.machineto.com/api-spec-11b-classover-sub-sucker-rod-joint-10159630

Size	model	OD(mm)	Length(mm)	Piece weight(kg)
5/8”x3/4”	YSPR16-19SMFS	41.28	101.6	0.76
3/4”x7/8”	YSPR19-22SMFS	46.0	101.6	0.92
7/8”x1”	YSPR22-25SMFS	55.6	114.3	1.43
1”x1-1/8”	YSPR25-29SMFS	60.3	127.4	1.56

Details

Material: AISI 5140

Standard: API Spec 11B

Smoothness: 3.1*10^-3

Coat Thickness(in): 0.01in ~ 0.02in

Basic hardness: HRC 16-23

Surface Hardness: HRC 55-62

Bonding Strength(Mpa): 484

Hole rate: <2%

Min. Hardness of the layer: 595HV_0.2

Min. Tensile Strength: 655 Mpa

Operating Temperature: -1000~400 Centigrade Temperature

Life: > 180 days

We are the manufacturer of sucker rod couplings and can supply the high quality sucker rod couplings in low price with the hope to establish a long-term relationship with you.