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Author Topic: props  (Read 3072 times)

Vaas

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props
« on: January 09, 2013, 09:54:47 pm »
What is the difference between screw, m4 and m5 props?
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Neil

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Re: props
« Reply #1 on: January 09, 2013, 10:02:18 pm »
just the diameter of the shaft that the prop fits on............
in simple terms an M4 propellor is a prop drilled and tapped to fit onto a 4mm diameter thread (actually about 4.3mm) and an M5 prop is to fit on a 5mm diameter thread (again slightly larger at 5.3mm)
 
neil.
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NFMike

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Re: props
« Reply #2 on: January 10, 2013, 12:12:25 am »
Quote from: Neil on January 09, 2013, 10:02:18 pm
a 4mm diameter thread (actually about 4.3mm) and an M5 prop is to fit on a 5mm diameter thread (again slightly larger at 5.3mm)

I don't think that is right. M4 and M5 (and I believe other sizes) of male threads are never more than the nominal diameter and usually a tad less. An M4 propshaft is a 4mm steel rod with an M4 thread cut on each end, so the threaded part can't be more than 4mm. Close M4/M5 clearance holes are 4.3/5.3mm.
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davidjt

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Re: props
« Reply #3 on: January 10, 2013, 11:13:55 am »
hi,
 
i have just been drilling some M5 threads for a job and useing 4.2 drill for hole and M5x0.8 tap and fits snug, so M4 will be 3.5mm drill hole. allways use less size hole not bigger
 
david
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w3bby

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Re: props
« Reply #4 on: January 10, 2013, 01:27:24 pm »
M4 coarse is 3.3mm drill, M4 fine depends on the thread...

Tap size chart
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PLAcard

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Re: props
« Reply #5 on: January 11, 2013, 10:25:57 pm »
As W3bby included, use the tap chart to identify the correct drill bit to use.  Especially on fine threads, otherwise as soon as you tighten up, the threads could strip.  Always when tapping threads make the tap wrench or tool is straight as wonky threads cause problems.  Best of luck!
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