loctite?

[captain]

Bryan, I may be wrong but I thought it was 6-40. I bought a 6-40 die from Brownell's the gunsmith supply place.

[Bryan]

Tom I could have sworn that the 1st time I had the brass nut reproduced I ordered it in #6x40 and it was too big for the stem.... Let me know, I've been wrong before.

[luis]

I just measured three Disk & Retainer stems.

The overall length including the seat came out to:
0.803”
0.807”
0.761”

Duckbill, I hope that helps you.


The threads outside diameter for all three came out at 0.122 inches.

The nominal diameters for screws are as follow:
#4: 0.112”
#5: 0.125”
#6: 0.138”

I think of a #5 screw as an odd size, but from what I measured it seems to be a #5.
All three of those screws sizes can be found on a 40 threads per inch pitch.

[oldmossback]

staking? Treasureman, that's an old British term for pounding the bejebbers outta the end of a bolt after tightening a nut down. Mashing the end of the bolt stops the nut from backing off!.......was a popular method during WWII on Brit fighter planes...........You don't fix your regulators like that do you?????????

[captain]

Bryan,
Looking at Luis post you may be right. I had used 6-40 thread on the stainless disc retainer I made because I thought that was what the stock ones were.

[duckbill]

Thanks Luis!
That's what I was after.

[Bryan]

When I talked to the shop about making that little brass nut they all said the same thing......#5x40 is an unusual size....Also if you notice the nut is a non standard width across the flats....If they would have stuck with a standard nut we could have all purchased them in bulk from just about anywhere.

[treasureman]

I used to use the four pound hammer with a staking tool...guess thats why some stems are longer than others......lol

So which is it 5-40 or 6-40. When i go to the hangar, i can hit up one of the aero mecs for some nice Faa approved stainless screws, and some nice locknuts

[Bryan]

#5x40 is the story I'm sticking to. Take a stem with you and compare. You can tell right away.

[treasureman]

5x40 it is. Got a dozen screws, all stainless though they were one inch long, along with locknuts. I will have to cut them and use the nut as a thread cleaner, I will post how they turn out