OPTIMUM
M A S C H I N E N - G E R M A N Y
Img.3-43: Tap external
thread
3.24
Thread types
Designation
ISO-thread
UNJ
Whitworth
GB
TU2506 | TU2506V | TU2807 | TU2807V
Page 132
Img.3-44: tap internal
Profile
Nut
Bolt
Nut
Bolt
Nut
Bolt
Original operating instructions
thread
Code
Short term (e. g.)
letter
M
M4x12
UN
UNC
1/4" - 20UNC - 2A
UNF
UNEF
0.250 - UNC - 2A
UNS
UNJ
1/4" - 20UNJ
B.S.W.
1/4" in. -20 B.S.W.
W
Application
Version 1.0.1
2014-05-16