-40%
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8
RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8

RARE UNBRAKO Pat Pending Prototype Thread Mount 3/8" Threaded 5/8" Socket

$ 10.56

Availability: 32 in stock
  • Item must be returned within: 30 Days
  • Country/Region of Manufacture: United States
  • All returns accepted: Returns Accepted
  • Number of Pieces: 1
  • Socket Type: Standard Length
  • Brand: UNBRAKO
  • Restocking Fee: No
  • Refund will be given as: Money Back
  • Size: 3/8 X 5/8
  • Return shipping will be paid by: Buyer
  • Action: Ratcheting
  • Condition: Used
  • System of Measurement: Standard (SAE)

    Description

    I don't really know how best to describe this pair of sockets.  They came to me in a bucket of mostly PLOMB - PLMVB vintage sockets along with a few Duro Chrome and New Britain sockets that I acquired at the estate sale of a local Chassis Mechanic / Locksmith.  I saw nothing but good old American brand name stuff at this sale and I am presuming this odd pair of sockets probably hails from the same era but I can't back that up and have no idea how he used these or why he had them.  Obviously they don't fit a standard square 1/4", 3/8", or 1/2" drive ratchet or other device.  As you can see in my photos, the mount is a threaded round hole and one of the sockets even has a bushing / reducer changing the size it would attach to.  Unless there was a system or machine I am not familiar with, I have never heard of a thread mount socket.  Doesn't seem at all practical since standard threads would only allow you to tighten things and the socket itself would likely loosen up and fall off if you were attempting to loosen a tight nut or bolt.  I am selling this pair together because only one of them has clear readable markings.  Without that one as a guide, you would be hard pressed to read the stamping on the other.  Also, there is only the one threaded reducer so for all practical purposes, you are getting only one complete socket suitable to add too your collection and one conversation piece.  The socket end is 12 points and fits a standard 5/8" nut.   The threaded hole where a ratchet would normally attach is about 3/8" however the thread looks like a fine thread rather than an SAE.  The stamping says "UNBRAKO" on one line and underneath it says "PAT PEND".  No other identifiable markings are visible.
    Everyone knows the Unbrako name when it comes to hardware and fasteners but I was unaware they had dabbled in tool production.  I would welcome any input fellow tool enthusiasts might have on the subject and time era when this may have been the case.  Also, any ideas or input regarding the existence of thread mount sockets.  My guess is they were for some kind of drill press type tool or production machine but that's strictly a guess.  Thanks for looking and good luck.
    Please visit my other listings for a variety of vintage American tools.