Laydown Threading
Insert Overview
fl at top
F42
thread
profi le
standard tolerance
class cresting application page(s)
60 Partial
profi le
60º — — N General use for 60° thread forms, such as ISO
and UN, where non-cresting inserts are desired
to cut a variety of pitches. F46—F47
ISO Metric ISO ISO R262,
DIN 13 6g/6H Y Widely used metric 60° V-form for all industries. F48—F53
UN American
UN ANSI B1.1:74 2A/2B Y Widely used inch-based 60° V-form for all
industries. F54—F57
NPT NPT ANSI/ASME
B1.20.1S1983 Standard
NPT N National Pipe Thread standard 60° thread form
for pipe fi ttings. F58—F59
55 Partial
profi le
55º — — N General use for 55° thread forms such as
Whitworth, BSW, and BSP where non-cresting
inserts are desired to cut a variety of pitches. F60—F61
W Whitworth,
BSW, BSF,
BSP BS 84:1956,
ISO
228/1:1982,
DIN 259 Medium
Class A Y Widely used 55° form for gas and water
connections. F62—F63
API-
RD API round API STD.
5B:1979 Standard
API RD Y 60° V-form with large radius for casing, tubing,
and line pipe in the oil and gas industry,
including 8 and 10 round forms. F64
PG PG DIN 404B0 Y 80° steel conduit thread. F65
RD Round DIN 405 7e/7H Y Round thread form for tube fi ttings in the
chemical and food industries. F65—F66
TR Trapez DIN 103 7e/7H N 30° truncated metric thread