If Trevor says they are OK thats good enough for me.
Tony
Tony
Ebay - Buyer beware
- Thread starter b'knighted
- Start date
The female thread doesn't know the difference. I used s/s UNC all the time.
Actually, the UNC's are better! I used them all the time.
Does anyone know where you can get original cad plated cheese head cover screws, given that cad is hard to get done most places anymore. At our recent national rally here in Australia, one of the boys had a beautifully restored Shadow with the " Correct " cover screws, when i asked where he got them he replied that he'd made them himself.....maybe a supplier of British aircraft cheese heads may be a source, allthough i'm not to sure where the Brit planes of yesteryear would have used whitworth thread screws....most Brit planes i've worked on used alot of BA, BSF threads.......whilst i'm at it....another "Hard to find" item is the original flat plain washers (also cad plated) with the 30 deg chamfer on one edge only.....where to buy.from???.....or unobtainium, as they say...I believe other high end British bikes and cars used them as well....any thoughts, or ideas appreciated.....cheers..Greg.
Darn it all Greg I wish my old memory worked .... there was a s/s slotted screw that would be a match but one had to turn the head diameter down to size in a lathe. I believe they were available from McMaster-Carr (a huge industrial supplier here in the states).
I could never find a s/s screw that did just fit without this narrowing. I used 1/4"x20 allen heads myself and was always getting hell from Rollie Baker because of it. I will try to go through the on line catalog to see if I can find the slotted screw that did need
machining..... for that matter you could chuck them up in a drill press and file to size.... it wasn't much. Hey, did anybody notice I said "darn it" at the beginning of this post? (humor)
I could never find a s/s screw that did just fit without this narrowing. I used 1/4"x20 allen heads myself and was always getting hell from Rollie Baker because of it. I will try to go through the on line catalog to see if I can find the slotted screw that did need
machining..... for that matter you could chuck them up in a drill press and file to size.... it wasn't much. Hey, did anybody notice I said "darn it" at the beginning of this post? (humor)
Here is the McMaser-Carr screw page..... click on the head you want and usually s/s is available . BUT, the high-profile fillister head machine screw I THINK I used to use is now only available in nylon!!!!
http://www.mcmaster.com/#machine-screw-fasteners/=k16hkd
http://www.mcmaster.com/#machine-screw-fasteners/=k16hkd
I might be being pedantic about 60 year old threads, but it doesn't matter whether it goes in the hole or not, an M6 screw will go in a 1/4" BSF hole, but it's miles undersize & the wrong pitch.
The theory is that when you tighten a nut & bolt it is the flanks that lock it up & do the work. If you have always used 55deg screws before, a 60deg thread will be making a helical line contact until it deforms the ally enough to hold. i.e. it will only lock up on the flank face once the ally has burred over. So don't be surprised if you have to retighten them a few times before they `fit'.
Ray
The theory is that when you tighten a nut & bolt it is the flanks that lock it up & do the work. If you have always used 55deg screws before, a 60deg thread will be making a helical line contact until it deforms the ally enough to hold. i.e. it will only lock up on the flank face once the ally has burred over. So don't be surprised if you have to retighten them a few times before they `fit'.
Ray
If you were stuck at the side of the road, I bet you would stick A T D 'S in there( any dam things ) !
Yes Roy, but you don't buy a complete set of cover screws for an emergency!
Ray