need ID on T wrench

[skylab]

T wrench is about 4 inches long, fits a 5-sided Polygon nut.

shows "MCD" and serial# 4510103 on other side.

Also shows "MFC" on round end

I flipped the pic so letters are upside down.

[john k]

The only five sided bolt head I am aware of is on the top of fire hydrants, but there are probably more in industry.   Firemans wrench is usually 24 inches long at least to open the valve.

[Stoney]

I'm like you John, the only modern 5 sided fastner is for fire hydrants, but back when some cars had 3 sided hubs so who knows.

[skylab]

thanks....
I was thinking a value wrench

[Papaw]

Do you mean a VALVE wrench?

[skylab]

oops yes

[rusty]

The other place 5 sided nuts are/were used was on access covers for water meters so people wouldn't open them up and change the readings. Since that wrench doesn't look beefy enough to turn a hydrant I suspect is is a meter wrench....

[bgarrett]

The telephone company uses 5 sided bolts on manhole covers

[toolmiser]

I also have this wrench, although the only mark "might" be the letter W, but is hard to read even with magnifier, my kindergardener says it's a W tough.  This one has a little tab on the outside that sticks out about 1/4".  I also thought of fire hydrant, but checked it and it is way too small.  I never asked the previous owner, but he seemed to have a lot of plumbing items.

[rusty]

Pentagon wrenches are measured along the flat, that is, how long is one flat side.

Standard water meter box keys are 5/8 (#1) or 3/4 (#2)

Curb box cover nuts (manhole covers etc) are 5/8 or 7/8

Certain Buried meters also use a 27/32 pentagon nut for the lid....

[lauver]

Gang,

I recently acquired a modern chrome Snap-on 5-sided socket. It has a part number but no size.  I tried a search on the SO website, but I got a message saying this socket is no longer available.

If anyone is interested, I can probably find this socket and post a photo or two.  Also, I can take a measurement of one of the flats.