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allen key size for pump?
- Thread starter steved101
- Start date
possibley the one that fits?
usually 5mm
usually 5mm
My set of allen keys aren't marked with sizes but did a quick measurement with an old imperial micrometer (0.156"), multiplied by 25.4 and I'm pretty sure it's 4mm. 
That's an old grundfos 15-50, yours may be different.
That's an old grundfos 15-50, yours may be different.
grundfoss are 4mm but i have seen some that are 6mm (Dab i think)
4 and 6mm are most common but sometimes you wll come across one that is 5mm
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