rustyaustinchamp Posted January 30, 2015 Share Posted January 30, 2015 A friend of mine found this bolt about 20 years ago. It has the broad arrow property mark on the head and below this there is an inset panel (different metal, may be copper). Does anyone know what it is from or approximately when it was made? Thanks Martin Quote Link to comment Share on other sites More sharing options...
fv1609 Posted January 30, 2015 Share Posted January 30, 2015 (edited) Can you identify the thread? If it is Unified then I don't think it will be from the Great War. Perhaps it is Whitworth? The other thing is the slightly ornate style of the arrow suggests it is of some age. PS The other thing is that having a round head doesn't allow turning, so I assume the inset metal is to block over a screwdriver slot once the bolt has been adjusted. It seems to suggest something artillery or optical to me. Edited January 30, 2015 by fv1609 PS Quote Link to comment Share on other sites More sharing options...
fv1609 Posted January 31, 2015 Share Posted January 31, 2015 I wonder if the tip once housed a leather washer? Maybe this was to seal over a lubrication filling point that was filled on manufacture? Is that metal in the head perhaps lead? So at a major service or refurbishment this could be chiselled out, the bolt undone, lubricant topped up, bolt replaced & small piece of lead hammered into the slot again? Quote Link to comment Share on other sites More sharing options...
Gordon_M Posted January 31, 2015 Share Posted January 31, 2015 It's a locking bolt of some kind, for sure, you screw it in and then lead-fill the slot to prevent tampering. (Resist any offers from Great War Truck for it - they will only want to build an entire truck round it 8-) Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted January 31, 2015 Share Posted January 31, 2015 Maybe it has to be non-magnetic due to what it fitted, a clue maybe ........... Quote Link to comment Share on other sites More sharing options...
Tony B Posted January 31, 2015 Share Posted January 31, 2015 The end does look like it has taken some hammer. Does look like a sealing bolt for a liquid container. Note what appears to be skirt around edge and pin in the middle. Or might it be the tension screw on a saftey valve? Second longer look, reminds me of the screw used in a cartridge starter. Quote Link to comment Share on other sites More sharing options...
ploughman Posted January 31, 2015 Share Posted January 31, 2015 It may be from an OS Trig Point. Quote Link to comment Share on other sites More sharing options...
ruxy Posted January 31, 2015 Share Posted January 31, 2015 Maybe it has to be non-magnetic due to what it fitted, a clue maybe ........... Agreed , I would put my ££ on a "anti-tamper" locked fixing for a ships bridge compass binacle ,, or dunno Quote Link to comment Share on other sites More sharing options...
Tony B Posted February 1, 2015 Share Posted February 1, 2015 Could be. Is similar to part I in illsutration http://electroniccalibrators.tpub.com/TB-55-6605-262-24/TB-55-6605-262-240003.htm Quote Link to comment Share on other sites More sharing options...
rustyaustinchamp Posted February 1, 2015 Author Share Posted February 1, 2015 I thought someone on here would know!, I will pass the information on to Colin, I agree it looks very much like a locking bolt for a ship's binnacle. Thanks to everyone who replied. Kind regards Martin Quote Link to comment Share on other sites More sharing options...
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