API –Oil Field Buttress Casing Thread--Internal
Standard API, Three cutting edges , screw locking
5TPI 1/16 and 1/12
Designation
TPI
Thread Taper
D
X
Y
L
B
22NR 5BUT75
5
1:16
12.7
2.8
1.9
22
4.86
22NR 5BUT1
5
1:12
12.7
2.7
2.2
22
4.86