Operation
Version 1.1.6 - 2021-9-17
46
Translation of original instruction
TU3008G
GB
T
U
3008G
_GB
_4.
fm
4.19
Thread types
Img.4-32: Tap external thread
Img.4-33: Tap internal thread
Designation
Profile
Code letter
Short term (e. g.)
Application
ISO-thread
M
UN
UNC
UNF
UNEF
UNS
M4x12
1/4" - 20UNC -
2A
0.250 - UNC - 2A
Machin
e to
ols
a
nd gen
eral
mecha
nical
en
gin
eerin
g
UNJ
UNJ
1/4" - 20UNJ
Aircraft industry and
ae
ro
space in
dustry
Whitworth
B.S.W.
W
1/4" in. -20
B.S.W.
Cylin
drical thread
s,
Pip
e th
re
ads,
or coni
ca
l pip
e
thre
ads
for thread
co
nnectio
ns w
hich
seal
ISO-trapezoid
thread
(one- and mul-
tiple-
threaded)
TR
Tr 40 x 7
Tr 40 x 14 P7
Motion thread,
Le
adin
g spind
le and
transp
ort spi
ndle
Nut
Bolt
Nut
Bolt
Nut
Bolt
Nut
Bolt