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M557 or ?????

G

Gspragge

Well-Known Member
Premium Member
The fuze looks like a typical M557 but has no designation on it. It doesn't
have the magazine but a screw in disc with a thin copper sheet in the centre of it.
I have a feeling that I have the mortar version, this might account for it not fitting the projectile ?
Then it's a nice fuze but useless here !
 

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what you have is the top half of the M557 (also designated as M48). The M28 has a 1.7x14UNS thread. In order to be and M51 or an M557 fuze it needs a Booster attached. M21 for the M51 or M125 for the M557. With the booster attached the thread becomes 2inx12 UNS to match the standard US 2in fuzewell seen in 75mm, 90mm 105mm and 81mm mortar to name a few
 
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