What is This??

[crazymonkey2465]

Anyone know what this is and what it's used for? My guess is something along the lines of a crows foot ring spanner. Anyone seen one before?

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[jakemac]

Looks like an adjustable pin spanner for use with a breaker bar.
Specialty tool for the oil fields, maybe ?

 

[crewchief888]

it's for hyd cylinder heads.

interesting, never seen one like this.

 

[dmftoy1]

Removes exhaust roses on BMW R60/2's - called pin wrench or pin spanner


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[Private Lugnutz]

Very interesting. All the pin spanners I have ever seen (granted, all vintage) had an integral handle. I guess this was a natural innovation, as you surmised. Is that an "AN" marking I see on the face of the attachment piece? If so, it could be aeronautical and federal. Also, is there a mfgr's name under the "AN" number?

 

[jdpflyer]

Aeronautical spanner wrench, .75-2" according to Google.

 

[ducksface]

Indexable spanner.
I have a basin wrench that uses the same ratchet attachment format.

 

[pi_guy]

Saw one at shock absorber place, it fits some struts and a certain type of coil over.

 

[sgtmac]

Some radial engines use spanner type nuts on the push rod tubes, have also seen hydraulic actuators that this type of spanner could be used on.

 

[notlob]

Adjustable pin spanner. much more commonly equipped with a handle. Like this:

 

[Provincial]

During WWII the military tried to reduce weight and bulk of many tools by adapting them to be used with square drive bars and extensions. This was especially true of aircraft tools. The leadership assumed that there would be square drive bars and ratchets to provide handles for these tools, since the drive tools were to be part of a complete tool set anyway. Thus, many AN-series tools follow this design profile. It makes a lot of sense if you think about it.

I have seen three types of square drive spanners (American term, not British - which would describe regular "wrenches" as we Americans call them), Pin spanners, like this one, Hook spanners, which have a flat-faced hook instead of the pin, and pin face spanners, which have pins on the sides of the tool that engage holes drilled in the face of a "nut" like the gland nut of a hydraulic cylinder.

 

[northwoods]

Need a Plomb pebble 3/8" combo.
What do you need?
I have Plomb and Blackhawk to trade.

 

[crazymonkey2465]

During WWII the military tried to reduce weight and bulk of many tools by adapting them to be used with square drive bars and extensions. This was especially true of aircraft tools. The leadership assumed that there would be square drive bars and ratchets to provide handles for these tools, since the drive tools were to be part of a complete tool set anyway. Thus, many AN-series tools follow this design profile. It makes a lot of sense if you think about it.

I have seen three types of square drive spanners (American term, not British - which would describe regular "wrenches" as we Americans call them), Pin spanners, like this one, Hook spanners, which have a flat-faced hook instead of the pin, and pin face spanners, which have pins on the sides of the tool that engage holes drilled in the face of a "nut" like the gland nut of a hydraulic cylinder.

Wow thanks for the info, I definitely learned something today!!

Here is a better picture of the writing on it

When I google that part number, something very similar comes up on Dart Aerospace, and they call it a "3/8" DRIVE ADJUSTMENT SPANNER"





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