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a photo of the bolt in question

A previous owner fitted the light fitting pictured above, and has not left me a tool to remove the bolt. The bulb has blown so I need to get in to the unit. The head diameter is about 12mm and the gap between the two notches is about 6mm. I would like to remove it with some technique involving more finesse than simply smashing up the fitting and/or drilling out the bolt.

I hope someone can recognise the bolt and give me a search term which will let me cheaply buy a bit for this bolt from somewhere like Ebay UK.

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up vote 10 down vote accepted

It's called a spanner slotted (or slotted spanner) head. Useful site here. Hard to find in the UK, why the owner used one I cannot imagine. Screwfix doesn't have them. This site may do, although it is international. You'll need to figure out the correct size before you order.

Alternatively get a real cheap flat-head screwdriver the right width and file down the middle until you get the right notch.

If you can grip it with a pliers try a pair of locking pliers and unscrewing it that way I keep a mini vise-grips handy for that sort of thing.

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I usually bend a paperclip into a u shape, stick the two ends into the screw slots, then get a set of pliers and grab the paperclip right at the screw face... then turn. – Hightower Oct 9 '12 at 9:14
Could work, depends on how tight it has been screwed in. – GdD Oct 9 '12 at 10:24
You can also gang two thin screwdrivers together by clamping them between a pair of pieces of wood (to keep the alignment). If it's really stubborn, cut grooves in the wood so the screwdrivers don't spill. – Alex Feinman Oct 9 '12 at 12:59
If you run into these with any regularity, you can find "security bit sets" online for ten's of dollars, which typically contain several sizes of spanner bits in addition to many others. Handy to have for those off times you run into these. – gregmac Mar 6 '14 at 22:47
I easily unscrew it by using a flat-head screwdriver, fiting the head in one of the slot and hitting the screwdriver to make it turn slowly. To screw the bolt back, I just saw its head, to make it as a regular flat-head bolt so I could use the flat-head screwdriver as normal. – Enora Nedelec Apr 23 '15 at 15:59

I think that's a Spanner bit:

Four piece set

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Variously known as a spanner-head, snake-eye or pig-nose screwdriver. I had exactly the same problem as the OP - I think I have the same light fixing. Presumably the idea of using a weird fixing is to protect from vandalism, but it's a right pain if you don't pass on the right tool to subsequent owners.

I put off replacing a blown bulb for months, looked all over for the right tool but couldn't find one. I was just about to start grinding a hole in an old screwdriver when I tried undoing it by hand, and found that it was only on finger-tight. So to anyone facing the same problem - try unscrewing it by hand!!!

Otherwise I suspect it's cheaper to smash up the fixing and buy a new fixing, than it is to order a special screwdriver from overseas.

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+1 "it was only on finger-tight". – Pete Becker Dec 14 '13 at 13:43

I took a simple screwdriver (AC tester actually) and cut the middle of it with a rotary grinder. It works for me to open these screws whenever I barge into them once in a few years. No need to search for rare bits for this one.

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find a scissor with not-so-flimsy build, open to the right angle and insert into the two slot. If the screw is not too tight, this could work

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