Identify the thread type....

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26 Aug 2009
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Got some radiators that aren't the common G1/4 thread type. The rad's are unbranded but all identical. The threads measure 15mm from edge to edge (internal). I can't get an exact measurement but the threads look to be space about 1.5mm apart. Also just to save me a few quid on buying multiple types of screws, the fan mounting holes are a slight touch bigger than M3 bolts, would the be M4? M3's just slide right through them.

Any help is appreciated.
 
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