Screw size for agfrc 78kg 1/5 scale servo

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I checked both screws in the kit I got and they are m3.5.

Maybe the other 1/5 servos are m3.5 and they are just lumping this one in
 
This would drive me crazy so I feel the pain! I'm thinking it must be the new "alien standard:alien:." It's neither metric, standard or even J.I.S ....
Good luck with the re-tap!
 
Tripp said:
This would drive me crazy so I feel the pain! I'm thinking it must be the new "alien standard:alien:." It's neither metric, standard or even J.I.S ....
Good luck with the re-tap!
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It's enraging for sure.

I checked it with every similar diameter pitch gauge I have at work.

It has to be an m3, maybe when it came loose vibrations rattled it around and blew out the pd a little
 
This got me thinking so I went and grabbed a brand new Rovan RS-2160D servo that I immediately pulled from a 360 LT truck and the 3mm screw it came with has wiggle while running it all the way down. Actually a whole lot more than I would have expected. I'm not saying by any means that this is a top quality servo but the screw size is 100% a 3mm and the treaded hole seems to be on the very loose side. I could see this screw backing out for sure if locktite wasn't used

I'm sure your screw is suppose to be a 3mm
 
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Tripp said:
This got me thinking so I went and grabbed a brand new Rovan RS-2160D servo that I immediately pulled from a 360 LT truck and the 3mm screw it came with has wiggle while running it all the way down. Actually a whole lot more than I would have expected. I'm not saying by any means that this is a top quality servo but the screw size is 100% a 3mm and the treaded hole seems to be on the very loose side. I could see this screw backing out for sure if locktite wasn't used

I'm sure your screw is suppose to be a 3mm
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My rovan is tighter than this. I'm just rolling with it for now. I've got a metric ass ton of SS and titanium screws in your m3-m6 sizes. so I'll just roll on.

This is directly from AGFRC about their servo though

1777128840972.webp
 
Tripp said:
so it is a M3.5 ?
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No, that's why I'm absolutely stumped.

There isn't a path to an m3.5 thread fitting this. The minor diameter, the smallest part of the thread pitch, is only 2.5mm. that's correct for an m3. It would need to be 2.9ish for an m3.5

All of agfrc's documentation says m3.5, but the hole and pitch from what I can tell are equal to an m3.

I ordered their kit, I bought several, and I tried a few precision screws from work, I then pinned the bore of the thread to check the minor and it's definitely what you'd expect from an m3 but it's blown almost like they used a single point turning tool and oversized the PD.

It's weird. But we can all be assured that it's m3
 
i have the same servo on my outlaw mate,
just measured it, the hole in the servo is drilled to 2.5mm and tapped to m3,
100 percent m3 (y),
no fancy screw pitch or anything, bog standard m3,
and yes the screws are a little sloppy in the hole from new as well,

edit; just had a deeper look and it looks like all the agfrc large servos come in the same box, but they just put a different sticker on for whichever servo is in there,
on the box its printed on the side with two different screw sizes/sets, one set has m3 and the other m3.5,
so 78kg and 100 kg use the same m3 screw and the 178kg servo uses a different gearset,
so i assume the 178kg servo uses the m3.5 screw, and possibly the 125kg as well (y),
 
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XJman said:
No, that's why I'm absolutely stumped.

There isn't a path to an m3.5 thread fitting this. The minor diameter, the smallest part of the thread pitch, is only 2.5mm. that's correct for an m3. It would need to be 2.9ish for an m3.5

All of agfrc's documentation says m3.5, but the hole and pitch from what I can tell are equal to an m3.

I ordered their kit, I bought several, and I tried a few precision screws from work, I then pinned the bore of the thread to check the minor and it's definitely what you'd expect from an m3 but it's blown almost like they used a single point turning tool and oversized the PD.

It's weird. But we can all be assured that it's m3
Click to expand...
Ok, understood... That's crazy!I
 
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