5/32 BSW dilemma

[morrisman]

Hi

Can somebody tell me : What is the correct diameter , to run a 5/32 BSW threading die over ?

I cannot find the appropriate chart anywhere .. even searching on the net

thanks MIKE

[fxst]

5/32 I guess or is that too easy? or you need the metric size? :)
I do it that way when I do BA or imperial threads and it works for me.
Pete

[Bryan]

Yep, I would have said nominal size minus a few thou clearance, but what do I know?

[.RC.]

I would say 3.97mm

[morrisman]

Yes, I also read it as being 3.97mm

Turns out the BSW tap and die set ( Japanese brand ) I bought, has rather sloppy tolerances . The die threads are too small in diameter and they will not start a cut when the nominal diameter is turned . .. too tight .

In the case of the 5/32 die , I had to go down to 3.6 mm in order for the die to get a start , and even then I have to apply much pressure to make it bite . Crap quality control at the factory ... makes you wonder how people can sell crap dies like that.

MIKE

[Greg Q]

Just wondering about that die: was it 1960's or earlier Japanese? or perhaps a Chinese version of a Japanese brand? In my experience anything Japanese from about 1972 or so has been about as good as it gets.

Greg

[Swarfmaker1]

Just wondering about that die: was it 1960's or earlier Japanese? or perhaps a Chinese version of a Japanese brand? In my experience anything Japanese from about 1972 or so has been about as good as it gets.

Greg

Ever tried the frost brand? Utter crap . I have a UNF/UNC set which have burrs still attached to the cutting flanks. They don't cut as they bblunt also blunt.

[.RC.]

Are we talking new or old Frost?

Frost used to be an Au drill manufacturer.... I think they are now owned by Sutton and operate in name only as far as making stuff here goes...

[Greg Q]

Frost claims to be continuing the 50 year tradition of serving the handyman market in Australia/New Zealand. I thought that there stuff has been made in China for a long time.

Back in the 60's there were a lot of Japanese tool sets sold in blue metallic painted boxes. Indifferent or poor quality, but they gave the junk tool market to the Taiwanese, then the PRC soon after.

[Swarfmaker1]

RC, I'm talking about new Frost. I though the Frost stuff was pretty good maybe 20 years ago, woefull stuff now. I believe Frost and P&N are owned by Sutton, Frost is obviously the low end of the range.


Are we talking new or old Frost?

Frost used to be an Au drill manufacturer.... I think they are now owned by Sutton and operate in name only as far as making stuff here goes...