Screw strength rating preference.
 

Looking to see what everyone's preferred screw material and strength ratings are. I'm looking to just have extra screws on hand and after looking at all my options there are all of choices. Like do I want stainless or black oxide. Is a-2 stainless better than 10.9 black oxide or vice versa. I'm going to go with an industrial supply company as suggested in another thread because you can get a pack of 100 for the same price as rc companies charge for 20-25.

Re: Screw strength rating preference.
 

Team KNK makes some highest grade screws. Here their website for more info. Team KNK Hardware - Team KNK Hardware

In a nutshell 12.9 grade is the best and harder.

Re: Screw strength rating preference.
 

Stainless is a waste of time. I bought hundreds of different M3 sizes and after 3 or 4 removals the hex flogs out.

Willie replacing with 12.9!

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Re: Screw strength rating preference.
 

Team KNK doesn't make anything. They buy screws, repackage them, and sell them.

If you keep stripping stainless steel screws you're doing something wrong. Using crap tools is probably the first thing you are doing wrong.


Why are you worried about the strength of your screws? Have you broken them? I've never had an issue breaking a stainless steel screw in a scale crawler.

What truck are you putting these screws in?

Re: Screw strength rating preference.
 

They will be for an scx10 scx10.2 and I also have a savage flux as well. Its really just a lot of misinformation out there so I figured with all the knowledge here someone would have something good to say. I'm not sure what grade rc manufacturers use so really I was just looking for opinions. I am aware that team knk and the like just repackage screws. My real issue is that to go from a2 stainless to 10.9 to 12.9 is a pretty significant price increase. So while I want to have plenty on hand I don't want to pay a small fortune to have spare screws.

Re: Screw strength rating preference.
 

10.9 is fine for most RC, 12.9 is better and if you're bending/breaking 10.9 then go 12.9. I've found in my bulk McMaster orders that some screw sizes are only available in one or the other strength so I go with that, still better than most RC branded screws I've used. "thumbsup"

Agreed, I've used many different stainless fasteners and don't trust them for RC use, too many of them round the heads out and/or break off making them nearly impossible to remove the remaining piece. I've got MIP and other great drivers and am careful to not overtighten. "thumbsup"

Re: Screw strength rating preference.
 

Yep, granted mine were from China on eBay. But I use Team EDS drivers so I don't think it's the tool. Sure I might not always completely pick every grain of dirt out of the button heads before I undo them. But equivalent 10.9 are no where near as soft.

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Re: Screw strength rating preference.
 

Not necessarily. "Stainless" is a wide umbrella and can consist of many different hardness alloys. You need enough carbon in Stainless as well as proper heat treating to give it sufficient hardness, and most cheap crap on the market has neither. The result is that quite a lot of the stainless fasteners end up being significantly softer than standard Grade 2 steel crap.

Re: Screw strength rating preference.
 

Quality stainless steel hardware has enough carbon content to not strip with proper usage.

Potential issues:

1. Chinese hardware - soft, junk hardware with bad tolerances that easily strips.

2. User error - over tightening and stripping hardware.

Re: Screw strength rating preference.
 

I think we're saying the same thing. It's the "quality" part that's so important, because that's the key ingredient that most stainless hardware is lacking.

Re: Screw strength rating preference.
 

Yes, and even good quality stainless hardware is not as strong as good steel fasteners. "thumbsup"

Re: Screw strength rating preference.
 

As is common most people lump all stainless hardware together. If you are just putting plastic parts together most hardware will work. A good quality 12.9 hardware should be good for most any RC. Notice I said most! I am sure someone out there will find a use where this will be / or was a failure. I wiil replace any screw that has a damaged head, it sucs trying to get out a stripped one.
The larger scale stuff of course will need quality hardware because it will put more pressure on parts because of the extra weight. I dont realy see a need for stainless on my rigs because they rarely see wet or muddy conditions. It does look nice though. With very little research online I was able to locate pretty much any hardware I would need although some was qty of 100 wich is fine. Places like Grainger, MSC, or McMaster Carr all are goodplaces to start.