Aircraft (?) Spark Plug Wrench

[Noworries]

Found this behind a work bench between the studs in my garage. I am in a rural area and there is a hanger on my property and back in the 70s/80s a couple of the folks in the area had small planes here.. When I googled BG spark plug wrench I get a couple of "vintage" hits. The box end is 1". Anyone seen or know about these??

 

[bpjr]

Could that be AC instead of BG? I wonder if that wrench goes back to WWII aircraft days? Modern aircraft plugs use the same size wrench as modern auto plugs

Nevermind. I just googled. BG and they were early aircraft plugs.

 

[flynlow8740]

I’m an aircraft mechanic, and I’ve worked on some old stuff. I’ve only ever seen 7/8 wrech size used on spark plugs. Even back to WWII era. I’m not saying it doesn’t exist, just that I’ve never seen it.


Sent from my iPhone using Tapatalk

 

[Outlander]

Regardless, nice find!!

 

[charger 73]

As previously stated 7\8 is the general standard for a\c plugs

 

[Noworries]

As the reason I posted was I had no info on what this is other than it is a wrench and cast into the handle is clearly B.G. SPARK PLUGS. Is it a spark plug wtench?? Don't know. Is it for aircraft? Don't know. After reading the above posts that the "common" aircraft spark plug is 7/8" I second guessed myself, I did go to school in the California Public School System it wouldn't be the 3rd time I was wrong. In the attached pictures you will see I checked, double checked and tripple checked. I used a Made In USA machinist rule, a Huskey socket of questionable manufacturer, 12 point as the wrench in question appears to be 12 point but in all honesty I didn't count, a Made In USA Dayton Combination Wrench and a Made In Sweden Vernier Caliper. All measurements/checks were conducted with a vintage castle nut. At this point I am now pretty sure it is a 1" wrench so if 7/8" is the common aircraft plug size and this is a plug wrench it is either very uncommon any very valuable or its just a 1" box wrench...

 

[Noworries]

Ok... based ok this patent application drawing it would seem it is simply an offset box end wrench...