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Old 03-16-2004 | 02:05 PM
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FHHuber
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Default RE: Another Prop Question
OS engines use metric screws to hold the thing together... and a SAE thread on the prop shaft.

1/4-28 for thier .40 class engines... almost always "SAE Fine" for whatever size they are using 1/4-28 is SAE Fine, 1/4-20 is SAE course.
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