British Ordnance Collectors Network
Join over 14,000 collectors of inert military ordnance. Get expert identification help for shells, fuzes, grenades, and more — plus access our classifieds marketplace and decades of archived knowledge. Free to register, takes seconds.
DZ dm93
- Thread starter German EOD
- Start date
German EOD
Active Member
Thanks ☝
Eggburt1969
Well-Known Member
Details on the fuze were double checked against German and US official documentation, and the manufacturer Junghans Microtec. The result was that its threaded rear is nominally 1.5", more accurately it uses the thread format of 1.5"-12UNF-1A.
The 1.5"-12UNF-1A thread format has a nominal external diameter of 1.5" (≈38.1 mm), a thread pitch of 12 threads per inch (TPI), so ≈2.1 mm. The UNF bit is short for Unified National Fine, whilst the 1A bit means a loose fit (the '1' bit) and an external thread (the 'A' bit).
Further details on the thread format can be found on line, such as the link below.
A dimensional diagram of the later updated externally version produced by Junghans Microtec, from about 2016, is attached below.
Please note that the cup at the rear, which holds its black powder charge, is not shown in this diagram, though the (M27×1-6g) threaded coupling to it is.
The 1.5"-12UNF-1A thread format has a nominal external diameter of 1.5" (≈38.1 mm), a thread pitch of 12 threads per inch (TPI), so ≈2.1 mm. The UNF bit is short for Unified National Fine, whilst the 1A bit means a loose fit (the '1' bit) and an external thread (the 'A' bit).
Further details on the thread format can be found on line, such as the link below.
A dimensional diagram of the later updated externally version produced by Junghans Microtec, from about 2016, is attached below.
Please note that the cup at the rear, which holds its black powder charge, is not shown in this diagram, though the (M27×1-6g) threaded coupling to it is.