API Grade

Minimum Yield  Strength (psi)

Mini Tensile Strength

(psi)

Max Tensile  Strength

(psi)

K

60000

90000

115000

C

60000

90000

115000

D

85000

115000

140000

H (non API)

115000

140000

173339

Specification

Thread Size（in）

Connection Sucker Rod Size (in)

Length (ft)

5/8”

15/16

5/8

2-30

3/4”

1-1/16

3/4

2-30

7/8”

1-3/16

7/8

2-30

1”

1-3/8

1

2-30

1-1/8”

1-9/16

1-1/8

2-30

1-1/4”

1-3/8

1

2-30

1-1/2”

1-9/16

1-1/8

2-30

API Grade

API Standard Series Steel

Chinese Standards Commonly Used Steel

K

AISI 46xx, AISI 47XX, AISI 43XX,

20Ni2MoA

C

AISI 41xx, AISI 15xx

20CrMoA

D

AISI41xx, AISI15xx, AISI 43XX,

 AISI 47XX,  AISI 31XX

30CrMoA,20CrMoA

H (non API)

AISI 4130, AISI4142

30CrMoA