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OPTIMUM
M A S C H I N E N - G E R M A N Y
Version 1.0.1 2014-05-16
Page 132
Original operating instructions
TU2506 | TU2506V | TU2807 | TU2807V
GB
3.24
Thread types
Img.3-43:
Tap external
thread
Img.3-44:
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
Mach
ine tools
and
g
enera
l
mech
anica
l engi
nee
ri
ng
UNJ
UNJ
1/4" - 20UNJ
Aircr
a
ft
and
ae
rosp
ace in
dustry
Whitworth
B.S.W.
W
1/4" in. -20 B.S.W.
C
y
lind
ri
cal th
reads,
Pipe threads,
or co
nical
p
ipe threa
d
s
fo
r thread
con
nection
s wh
ich se
al
Nut
Bolt
Nut
Bolt
Nut
Bolt