Rimfire 400 mounting screw size?
09-27-2011, 05:57 AM
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Rimfire 400 mounting screw size?
I'm having trouble finding the correct size screw to mount this motor. I had to rebuild the motor mount that broke off of my seawind.
A 3mm screw looks identical but does not screw in nice and easy like the original screw ( I only have 1 of the original screws ) I dont want to force the 3mm in and damage the threads?
Off to search some more..
Thanks
Steve
A 3mm screw looks identical but does not screw in nice and easy like the original screw ( I only have 1 of the original screws ) I dont want to force the 3mm in and damage the threads?
Off to search some more..
Thanks
Steve
09-28-2011, 01:38 PM
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RE: Rimfire 400 mounting screw size?
ORIGINAL: radius1x1
3mm comes in two pitch sizes; 60 and 50.
3mm comes in two pitch sizes; 60 and 50.
That would explain the fit issue..
How different are they?
When I mate the two screws thread to thread the look identical.
Would the difference be obvious?
I'll check the LHS and see if they carry both pitches?
Thanks
Steve
09-28-2011, 10:16 PM
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RE: Rimfire 400 mounting screw size?
Best way to check is with a pitch gage or tap and die set. I just invested in a T&D set since I just went through this with the same Rimfire motor which takes a "tri" mount and upgrade to a larger motor requiring a 4 bolt set up. It was necessary to tap new threads in the metal motor mount. In the event you have a buggered bolt, a metric die set is handy and beats a trip to the HS. 4mm also comes in two pitch sizes; .70 and .75.
