Arrma Screw Part number decoder - Mostly

[Jerold]

Have you ever put it back together and had an extra screw or two laying around. Hmm I wonder where that goes. Some times it's missed completely or other times I swapped screws and ended up with an odd ball.

Typically I figure out what screw it is. Then I go to my schematic and look for something in the area that could be that particular screw. It works eventually. However, if I knew what the part number the screw is then search the schematic it would go a lot quicker.

Well my friend, I have a solution for you and it's the low low price of free.

-- Disclaimer --

1. This is not an absolute or exhaustive list of all Arrma part numbers. There are some screws, most likely older ones or acquisitions, that don't follow this nomenclature
2. Some schematics have incorrect or incomplete part numbers. For instance schematic use and AR prefix instead of ARA.

It turns out that most Arrma screw part numbers have a pattern to them.

To test this out I looked at patterns on Amain and decoded them in XLS. It seems to hold true for the most part, these all valid part numbers with the correct featuers.

In one of my adventures I had one of these left. I knew it's an M3x12 Cap screw.

Which means the part number should be something like ARA723312. Next confirm that on Amain

Then start searching the schematic,... Yup there it is.

 

[Tex Koder]

Have you ever put it back together and had an extra screw or two laying around. Hmm I wonder where that goes. Some times it's missed completely or other times I swapped screws and ended up with an odd ball.

Typically I figure out what screw it is. Then I go to my schematic and look for something in the area that could be that particular screw. It works eventually. However, if I knew what the part number the screw is then search the schematic it would go a lot quicker.

Well my friend, I have a solution for you and it's the low low price of free.

-- Disclaimer --

1. This is not an absolute or exhaustive list of all Arrma part numbers. There are some screws, most likely older ones or acquisitions, that don't follow this nomenclature
2. Some schematics have incorrect or incomplete part numbers. For instance schematic use and AR prefix instead of ARA.

It turns out that most Arrma screw part numbers have a pattern to them.
View attachment 275985
To test this out I looked at patterns on Amain and decoded them in XLS. It seems to hold true for the most part, these all valid part numbers with the correct featuers.
View attachment 275974

In one of my adventures I had one of these left. I knew it's an M3x12 Cap screw.

View attachment 275964​

Which means the part number should be something like ARA723312. Next confirm that on Amain
View attachment 275965
Then start searching the schematic,... Yup there it is.
View attachment 275966

Thank you.
Very helpful info.

 

[slick2500]

I moved this to the tools section and made it a sticky.

 

[Smilinbri]

Have you ever put it back together and had an extra screw or two laying around. Hmm I wonder where that goes. Some times it's missed completely or other times I swapped screws and ended up with an odd ball.

Typically I figure out what screw it is. Then I go to my schematic and look for something in the area that could be that particular screw. It works eventually. However, if I knew what the part number the screw is then search the schematic it would go a lot quicker.

Well my friend, I have a solution for you and it's the low low price of free.

-- Disclaimer --

1. This is not an absolute or exhaustive list of all Arrma part numbers. There are some screws, most likely older ones or acquisitions, that don't follow this nomenclature
2. Some schematics have incorrect or incomplete part numbers. For instance schematic use and AR prefix instead of ARA.

It turns out that most Arrma screw part numbers have a pattern to them.
View attachment 275985
To test this out I looked at patterns on Amain and decoded them in XLS. It seems to hold true for the most part, these all valid part numbers with the correct featuers.
View attachment 275974

In one of my adventures I had one of these left. I knew it's an M3x12 Cap screw.

View attachment 275964​

Which means the part number should be something like ARA723312. Next confirm that on Amain
View attachment 275965
Then start searching the schematic,... Yup there it is.
View attachment 275966

Awesome, but why didn't you have this effin info for me 2 weeks ago when I was struggling with my Senton6s build!!! I could have really used that formula! Would have saved me days!!

Great detective work!! Love it!

 

[Doom!]

Nice detective work, just bookmarked this post, thank you!

 

[joostin420]

More than 90% of the time I replace button head with cap head type screws. Cap head screws usually use a larger and deeper hex drive size.

 

[slick2500]

More than 90% of the time I replace button head with cap head type screws. Cap head screws usually use a larger and deeper hex drive size.

I do this as well.

 

[LicketySplit]

I do this as well.

Same. As much as I hate to say it, Traxxas does have better schematics. They actually show you were the screw goes versus a bunch of hardware floating around the page in the general vicinity. Not a problem for a lot of us but it would REALLY make things easier for new folk joining in the hobby.

 

[mat60]

Been trying to stock up on different size screw kits but finding that doesn't always work. Helpful to no what numbers mean. Thanks!!

 

[bukshypro]

I noticed most or all screws part numbers started w/ 7, but never went on forward with looking more at the logic. You re an absolute hero

 

[Chvy2nv]

This is great info. Thank you

 

[Greengaunja]

Nice catch! This will surely help many folks because we all know screws are like socks in the dryer. One goes missing and 3 extras show up somehow.....