Silver for s&s coupler

[Gabor Varga]

Greetings,

I'm before my first s&s coupler brazing. I already did some silver works till now without problem, but I can't determine which silver is the best for brazing couplers. These are what I can buy easily.

 - Sif Silver No 39 38% silver

 - Sif Silver No 43 55% silver

 - Fontargen AF340 40% silver (covered, but I can remove, I wil use gasflux type-h silver flux)

Any advice? 

Cheers,

Gabor

[Andrew R Stewart]

Gabor- I’ve only used Harris 56% silver for the few S&S couplers I’ve done. Andy

 

Andrew R Stewart
Rochester, NY USA

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[Jon Norstog]

Gabor, on the S&S couplers, or any lug joint, you get best results with 55% Ag.

Good luck!

jn

"THursday"

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[Alex Meade]

Gabor, I've done a bunch, and always used Harris 56%.

Alex

http://www.alexmeade.com/Tools.htm

[Gabor Varga]

Thank you all, I will do it with 55% silver!

[Gabor Varga]

I found an 55% silver from Fontargen(A314). http://goo.gl/b3WkcA
It is very similar to Sif Silver No 43(56%). I think I will try it, because I can buy locally this. It is similar strentgh, but lower hardness(140 > 110). Does it matter?

[Ewen Gellie]

FYI, I've found that frame tube sizes vary enough that some are too tight a fit into the couplers. In my opinion, a lathe is necessary to work with S&S couplers and be certain there is enough clearance for the silver to penetrate. So I relieve the inside of the couplers, in approx 1/3 of the more than a handful that I do each year.  Only a few thou must be removed, but it's necessary IMO. I use Columbus tubes mostly. 

[Alex Meade]

I've done a bunch of couplers.  I do occasionally find a coupler that's too tight.  Sometimes it's the tube, sometimes it's the coupler.  It takes some careful measuring and bore gauges to figure out which.  I've found S&S's machining tolerances are quite good, and if I find a coupler that's undersize, I usually let them know and they're happy to get the feedback.  I've always been able to remedy the problem by relieving the coupler with either a small sanding drum on a Dremel or a fine-cut 3/4" carbide burr in a die grinder, a small mount at a time until the fit is right. I've never used my lathe, as I'd be worried I'd take off too much.  But that's just me.  And of course better too tight initially than too loose!

Alex

http://www.alexmeade.com/Tools.htm