Diameter of steel bar(mm)
Outer Diameter of coupler(mm)
Length of coupler (mm)
Thread (mm)
16
25
45
M16.6x2.5
18
28
50
M18.6x2.5
20
30
55
M20.6x2.5
22
32
60
M22.6x2.5
38
65
M25.6x3.0
42
70
M28.6x3.0
48
80
M32.6x3.0
36
53
90
M36.6x3.0
40
59
95
M40.6x3.0