Machinist's riddle...

[MultimediaMan]

I am a lowly screw. A mere two digits is my size and of a very common pitch am I.  I have a slightly larger, more popular, cousin who shares all of my numbers but not my size, larger by a fraction yet his name is a fraction of mine. So close are we that one is often are mistaken for the other. Our better halves know better. I have another close cousin on the metric side of the family who is every bit as common as my larger cousin, but we don't get along at all; about my size, but his pitch is much too far off.

What am I?

[Big Bore Bart]

#12-28 

[MultimediaMan]

Close, but no cigar.

[Sundog]

#10-32

 

[MultimediaMan]

No, and Colder....

[Motorhead]

10-24 sort of fits   1/4-20 being larger using the numbers  larger screw is fraction of original & 6mmX.1 is metric kin with far different pitch.

[MultimediaMan]

Scott is thinking right... there are others, if you look.

[Motorhead]

Scott is thinking right... there are others, if you look.

So that's wrong ? .... My head hurts ... NEXT 

[MultimediaMan]

#14 - 20 

[Motorhead]

#14 - 20 

So reading this ... it's 1/4-20 you were looking for ?

[MultimediaMan]

no... #14 - 20 was the size... 1/4 -20 was the larger cousin. "I have a slightly larger, more popular, cousin who shares all of my numbers but not my size, larger by a fraction yet his name is a fraction of mine." #14 is 0.242"; 1/4" is 0.250"....

[Motorhead]

Been on SAE charts course and fine and no such size as 14 I was able to find
Mind sharing what the heck a 14 size is ?

[MultimediaMan]

Depends on what year you look.  One of the prime reasons #14 -20 was retired was that it almost was interchangeable with 1/4" - 20. So it's kind of a sucker question if you're not old enough to remember them or to have ever seen one. Most machinists hardly ever notice #14 screws... but they sure notice a #14 screw HOLE... you see a 1/4" - 20 bolt will break off in them almost every time.

[Motorhead]

Depends on what year you look.  One of the prime reasons #14 -20 was retired was that it almost was interchangeable with 1/4" - 20. So it's kind of a sucker question if you're not old enough to remember them or to have ever seen one. Most machinists hardly ever notice #14 screws... but they sure notice a #14 screw HOLE... you see a 1/4" - 20 bolt will break off in them almost every time.

So a sucker I am ....  and that 10-24 still works that riddle   

[QVTom]

I'm with Scott on the #14-20.  Really? I have lots of old handbooks from various sources and have never seen a #14 listed.  The #12 still pops up now and again but is certainly obsoleted. I admit that I didn't start making screws with a file so there is much I don't know.  Number 14 (mumbling under breath)

Tom

[sixshootertexan]

Gagemaker.

[JJXGRUNT]

Tom, the info you need will be found on page 1823 of Machinery's Handbook Twenty Fifth edition it also found it on page 1411 of a very much earlier edition. Ican't give you the date of the earlier publication, as I only have a plastic laminated page over my lathe bench.

John

[QVTom]

Ha ha. I can't argue with the source, I guess you got me.   I will say that Machinery's Handbook could use some thinning out.   

[JJXGRUNT]

All the new technology in the last decade!

John

[sixshootertexan]

We have 3 or 4 different machinist handbooks at work I'll look tomorrow.