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Old 06-03-2011, 12:31   #1
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iso of these screws/ bolts

Hi! These bolts come from the boarding/swimming ladder, (dont know the correct term in English) - they are strange.
The head is smaller than the nut (15mm versus 20mm)
The shaft is 30mm and its diameter is 8mm
The nuts have strange "grooves" for some "special tool" (?) to tighten them.
Unfortunately 8 are missing - so its either "replacing them all" or finding these thingies here. Any ideas where to look?
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Old 06-03-2011, 12:44   #2
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Re: iso of these screws/ bolts

You might be better off replacing them all.
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Old 06-03-2011, 13:13   #3
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Re: iso of these screws/ bolts

Could they be a type of T-Nut?

Stafast Fasteners - T-Nuts

T - Nuts for Wood
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Old 06-03-2011, 14:10   #4
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Re: iso of these screws/ bolts

Those are "security nuts"........obtainable from McMaster-Carr..the tool is also available there.
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Old 06-03-2011, 14:18   #5
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Re: iso of these screws/ bolts

I'd check here: McMaster-Carr
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Old 07-03-2011, 13:22   #6
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Re: iso of these screws/ bolts

Quote:
Originally Posted by DWJensen View Post
I'd check here: McMaster-Carr
Thanks, did check, nothing remotely similar there, guess I will have to go with the advice to replace all of them.
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Old 07-03-2011, 18:08   #7
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Re: iso of these screws/ bolts

These are M8 Kinmar security bolts. popular in the UK. kinmar permanent security bolts and nuts

Dave
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Old 07-03-2011, 18:16   #8
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Re: iso of these screws/ bolts

The idea is they can only be tightened, unless you buy a special tool or cut or grind them off.
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Old 07-03-2011, 18:18   #9
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Re: iso of these screws/ bolts

Get a closer picture and contact these guys. Spanner Nuts

or http://www.jwwinco.com/products/section11/din1804/
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Old 07-03-2011, 22:09   #10
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Re: iso of these screws/ bolts

Quote:
Originally Posted by goboatingnow View Post
These are M8 Kinmar security bolts. popular in the UK. kinmar permanent security bolts and nuts

Dave
Thanks Dave! Perfect! (almost) - them kinmar have 4 "grooves" and mine only 2 - but THAT I sure can live with.
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