R/C Tech Forums - Polypro Pinion set screw size

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millsj2

07-18-2017 09:51 AM

Polypro Pinion set screw size

Does anyone know the size of the polypro set screw? I'm trying to find a allen wrench for mine and I don't know the size I need.

EbbTide

07-18-2017 09:53 AM

Quote:

Originally Posted by millsj2 (Post 14979022)

Does anyone know the size of the polypro set screw? I'm trying to find a allen wrench for mine and I don't know the size I need.

You need a .050" driver :)

millsj2

07-18-2017 09:54 AM

Quote:

Originally Posted by EbbTide (Post 14979024)

You need a .050" driver :)

Thanks for the quick response! Ordering an MIP driver now :)

JAE	07-18-2017 10:18 AM

More importantly where can one buy extra grub screws as these are easy to lose thx

EbbTide

07-18-2017 10:28 AM

Quote:

Originally Posted by JAE (Post 14979049)

More importantly where can one buy extra grub screws as these are easy to lose thx

That is a very good question lol. I'll have to use my screw measuring meter at home to see if I can find the size.

MarkA

07-18-2017 10:38 AM

I haven't tried it firsthand but I was once told that those screws can be found as an old inch-sized AE part.

EbbTide

07-18-2017 11:09 AM

Quote:

Originally Posted by MarkA (Post 14979072)

I haven't tried it firsthand but I was once told that those screws can be found as an old inch-sized AE part.

Dang I wish I'd seen this sooner. Just placed an amain order and would have tried these for our benefit lol.

Edit: I'm dumb. I forgot I had the screw tray with metric only measurements instead of both... I can't confirm the size, for now.

darksiede

07-19-2017 08:47 AM

.050 is also the same as a 1.3mm if I recall..

racer1812

07-21-2017 05:58 PM

I've never had a pinion set screw be .050, they've always either been 1/16 or 1.5mm

racer1812

07-21-2017 05:59 PM

Quote:

Originally Posted by darksiede (Post 14979818)

.050 is also the same as a 1.3mm if I recall..

1.27mm technically

racer1812

07-21-2017 06:05 PM

By far the most common set screw size for pinions is 1/8 inch with a 4-40 pitch using a 1/16th allen wrench.

Not including metric 48p pinions (most often used by Tamiya) Some do use a metric set screw (Traxxas) that use a 1.5mm allen wrench..

SlashBash10

07-22-2017 02:35 PM

Pretty sure TLR pinions are also 1.5mm

Rlmxracer

11-30-2018 11:06 AM

Sorry to revive an old thread.
Can anyone confirm that a .050 driver fits the PolyPro pinion set screws? I have two of these and have tried two different high quality .050 drivers and both are a loose fit. I contacted 17.5RC and they insisted that .050 was the correct size and would not tell me the thread size of the set screw. I even took the pinions back to the shop I purchased them at. They tried every driver they had metric and standard and not a single one fit properly. Thanks in advance.

K.Kincaid

11-30-2018 11:10 AM

Yes, it's .050

Rlmxracer

11-30-2018 04:44 PM

Yes, it's .050
that's odd because neither of the machined tip .050 drivers fit snugly and will end up stripping the set screw. I guess I will have to find replacement set screws that actually work with my drivers.

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