Lock washers don't work according to NASA

[coolcat2002]

I planned on using double nut method as an axle lock because I'm too lazy to drill a hole and put a cotter pin. Besides, the brass acorn nut looks cool. Then I read this thread in the nerdy engineering forum:
http://tbn2.google.com/images?q=tbn:ZNW6VWsrhiQyjM:http://img.alibaba.com/photo/50499742/DIN127_Spring_Lock_Washer.jpg
NASA Reference 1228 (1990) "Fastener Design Manual"
Direct quote "its locking ability is nonexistent... [and] is useless".
http://gltrs.grc.nasa.gov/reports/1990/RP-1228.pdf (http://gltrs.grc.nasa.gov/reports/1990/RP-1228.pdf)


Video with interesting demo of various locking methods:
http://www.nord-lock.com/default.asp?url=51.16.37

I'm not affliated with nord-lock or whatever but thought I'd pass it on.

[Scottydigital]

um

[dailey]

i've been using nord-lock's since a friend of mine turned me onto them, and have had no problem with them. supposed to be the shit. they are a little on the pricey side though. my 0.2.

[S TOWN ROLLER]

i've been using nord-lock's since a friend of mine turned me onto them, and have had no problem with them. supposed to be the shit. they are a little on the pricey side though. my 0.2.

Is that the same thing Miller was talking about last night?

What's for dinner?

[loady]

pretty interesting. makes me wanna go out n tighten every bolt on my bike....again. those nord lock things are pretty cool. where do you get those things? i didn't see a price or anything on their site.

[Hoofhearted]

Get a British 500cc four stroke single and you will learn all kinds of ways to (try and) lock nuts. You will also learn that dental adhesive is'nt that great for holding crowns and fillings in place.

[TGrant]

Thanks for posting that, Im gonna print that NASA fastener manual out when I get to work tomorrow.

[dailey]

pretty interesting. makes me wanna go out n tighten every bolt on my bike....again. those nord lock things are pretty cool. where do you get those things? i didn't see a price or anything on their site.
i get mine from a friend who owns a hardware supply company.

Is that the same thing Miller was talking about last night?

What's for dinner?
yes and marshmallow mateys (lucky charms knockoff, comes in a bag).

[Blue Collar Moto]

Neat stuff. Im going to have to get some for my axles. (and a few other things) Thanks for posting that.

[coolcat2002]

I'm going to buy some just to check it out at McMaster-Carr
http://www.mcmaster.com/#washers/=yn0tn

Look up "Washers" -> wedge lock (it's like $1 for a pair of steel zinc plated)
There's also this thing called Belleville lock washers, not sure what is.

[Hardball]

Wow! Only 98 pages of NASA data. Might as well print it out...we all paid for it. I'll keep my copy next to the john in the "Library."

Belleville washers are conical spring washers that can be used to lock a fastener or preload an assembly. We go through them like M&Ms around here.

http://www.bellevillesprings.com/

[flattracklarry]

I've used Nord-Lock washers for years. They typically work well when the materials that you're bolting together are softer than the hardened washers themselves. For example, they work well on motor mounts (aluminum to mild steel). They don't work on bolted surfaces that are as hard as the washers because the serrations slip on the bolted surfaces, even though the ramps on the washer inside surfaces are engaged. They also don't work on exhaust flange bolts. I've tried them on my shovel and the bolts still back out over time.

[6T Sinner]

Damn, that video makes me feel stupid. I don't have a cool accent, and I don't understand thread tension or even newton metres! Instead, I carry a leatherman with me everytime and flinch every time I hear a plink or grinding noise when I ride!