• Welcome to RCTalk! 🚀

    Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!

    • ✓ Friendly & passionate RC enthusiasts
    • ✓ RC tips & troubleshooting
    • ✓ Buy, sell & trade RC gear
    • ✓ Share builds & upgrades

Very frustrating, which screws?

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
A

aaron11193

RC Newbie
Messages
10
Reaction score
0
Points
0
RC Driving Style
  1. Bashing
Hey all, can someone please tell me how to measure the screws in nitro trucks? On myrc.com.au they have 4*20, 3*18 etc.. What does that mean?

Anyway I need some screws and nuts for the steering in my HSP Tornado..
I'm absolute poop at explaining where things are so I'll take a pic..

P1000310.webp

I need some of these and the nyloc nuts for them..

P1000311.webp


I think they're both the same..

I measured and they're about 20mm long and the head is less than a mm under 5mm..

Anyone know which ones they are and where I can get the nuts?

Thanks, Aaron.
 
aaron11193 said:
On myrc.com.au they have 4*20, 3*18 etc.. What does that mean?

Anyway I need some screws and nuts for the steering in my HSP Tornado..
I measured and they're about 20mm long and the head is less than a mm under 5mm..
Thanks, Aaron.
Click to expand...

You just described the 4*20 :D I believe the * should actually be a X, and the numbers are millimeters.. 3*18 would be a 3mm (dia head) by 18mm length screw. Just make sure your getting machine threads and not course threads.. (machine screws into a nut or threaded metal/aluminum.. while course screws into plastic..)
 
The 3mm/4mm would refer to the thread size of the bolt. The 18/20 is the length from the base of the head.

So, take out the bolt you need to replace, measure it from the bottom of the head to the tip and you will get the length you need. Measure how wide the shaft is and you get the width.

Looks like a 3x20'ish.

Just remember, too long and you can dremel it. Too short... and you can wish you ordered the other. ;)
 
go to harbor freight and get the 4 in electronic digital caliper, its about $16-18. it converts from in to metric, and its small enough to fit in the tool box.
 
You can also get a screw gauge with all the metric or SAE sizes.
Almost all these rigs use metrics and it took me a while to get used to that.
A 1/4 X 20 screw in SAE has a 7/16 hex head, 1/4" shaft and 20 threads to the inch. That 1/4" shaft can have different threads, but a metric 3 or 4 or whatever, always has the same amount of threads per inch.
 
Just get an exploded veiw of it there are on line manuals you can find them every where check with Rc Addict king of the internet
 

RC Builds

Back
Top