I tried the local Ontario supplier and Smith Wesson customer service in USA--not very helpful--I'm looking for the screw that holds the muzzle brake on--circa 1959- 7+ inch model 41--(ser 175**) one guy at S&W said they had it but I would have to talk to their export dept (its under 100.00 and its just a screw!!!)--then I got an email back and another guy said they didnt have it--so I called him and asked if they had the specs for the screw--seemed reasonable that S&W would have the blueprints,specs.I could then get a flat head screw of appropriate thread ,blue it and carry on.The guy said they dont have anybody old working there and they dont have that info.Tried Numrich,Brownells--maybe I didnt look hard enough.If somebody has the diameter,number of threads per unit length,course,fine,length etc--if I had a screw then it would be easy to get a new one--I dont want to screw the thread in the barrel up--I love the 41--but don't have a high opinion of S&W customer service.Thank in advance

Hello there,
the screw you would need would be a standard SHCS 5-40 thd.
Only problem is you will need someone to turn the head diameter down slightly, as the original screw had a slot, not a socket head. But this will work, as I have done this on my guns, when the proper screw was not available. They are out there, usually people would sell them for $15.00 or so. But you can get a box of the 5-40 screws for less. I know you only need one, and may be able to do just that at a well stocked hardware store, or search online.

Keep in mind that S&W dropped the muzzle brake and it's screw from production in 1978 so I would not blame them for not having any in stock or not being able to tell you what kind of screw it was.

In addition to the previous poster's advice, I'd suggest you check with Tom Beckwith as I recall he had a supply of aftermarket screws that would work. Since its a Model 41 thread he will probably be along shortly.

Yes, a while back I bought a couple of these screws from Tom. Worked great and very reasonable to purchase. Jim

According to Brownell's Encyclopedia of Modern Firearms (first published in 1959 and still in print), the old part number was 6511, it is a flat head slotted screw and the specifications are:
head diameter - 0.195
head thickness - 0.140
overall length - 0.722
unthreaded diameter - 0.122
unthreaded shank length - 0.142
threaded length - 0.447
and the thread is 5x40
The Brownell's book, even though it's never been updated, is an invaluable resource of information about older guns.
(My dear ole dad gave me a copy as a graduation present in 1961 and I have owned the book ever since and use it frequently.)

- - - - Buckspen

If you have a drill press, just buy a proper thread screw, chuck it in the drill press, start the drill press at high speed, take a file and hold it against the head until it is reduced in size to fit properly in the brake, color the whole thing with cold blue and your total cost will be under a quarter dollar.

Or do it by hand if necessary.

MIne is a 12xxx series gun from that period of time as well and I am now shooting it without the compensator as it was full time shooting to the left. With it off it now shoots perfectly straight. My suggestion is to check for that due to the age.