Reamer size for 3/16 and 1/4

Nathan House

Nathan House

Joined
Feb 14, 2000
Messages
1,204
Hi
I am looking to get some reamers,I know 1/8 is .1250
what is the size for 3/16 and 1/4.I bought a reamer for my 1/8holes
at .1255
Thanks for any input
 
1/4 = .250

3/16 = .1875

you'll want to use an undersized drill, then ream to exact size....

drill should be about .010-.030 undersized...
 
It TOTALLY depends on what you are going to do?

Make folders? Are you looking for a running fit, press fit, loose fit?

If you just want to drill holes for pins in fixed blade knives you need to MEASURE your pin stock accurately, and get a drill (you dont need a reamer) that is about .002 bigger than the pin

If you are making folders, you want about .001" difference between the measured pivot size and the hole in the folder blade.
 
I have only used 1/8 inch pin stock so far.One thing I have noticed
that most pin stock runs bigger than an 1/8 inch drill bit
I am only doing fixed blades at this time.I have used the .1255
reamer on the 1/8 inch holes and they fit perfect.does all pin stock run over sized?
 
Nathan, if you are only attaching handle and bolster material then you don't need to ream your holes. Look at decimal sized drills and order what you need for your pin stock. Unless your pin stock is precision ground it will vary in size. The only time you might want precision ground stock is for a pivot pin, or a slip or press fit application. As Tom mentioned, in these situations reamers come in handy.
 
I have not gotten the whole decimal thing down.
could some one give me a run down off common used size hole
like 3/16 1/8 and 1/4. that way I will know what size bit to buy
to get around reaming.I am qlueless with decimal:confused:
 
Mike,
For the 1/4" holes I found that a metric 6.4mm is a bit tighter than a size "F". The 6.4mm is .252~.253 and the "F" is .257. I also use a 4.0mm for a 5/32" hole. It is between a size 21 and 22 bit. (A #21 bit is 4.039mm). Granted, the metric bits are not as readily available as the letter or number size bits but can be ordered from Graingers, MSC, etc.

I am referring to holes for pins in fixed blade knives only! I don't know didly squat about folders!

C Wilkins
 
You can convert any fraction into a decimal number by doing what the fraction says in mathematical terms. Thus, 1/4 is 1 divided by four which equals .250.
 
Aside from doing the math, the charts for drill bits in MSC's catalogue give the decimal equivalents right in line with the fractional. Then just go to the fractional chart listing and buy size(s) up or size(s) down depending on the application.
 
all that stuff doesnt matter, what you have to do IS MEASURE YOUR PIN STOCK...............like it says above, the stuff is NEVER the exact size that it says, some 1/8" is .1245" while others is .126"

You need to measure it and buy the drill bits that you need accordingly. If I were you I would buy a good decimal wall chart, I have one behind my mill, it charts all the inch, milimeter, number, letter and anything else from .000 to one inch.
 
with the pin stock at uncontrollable sizes from the suppliers I'll many times
fit the pins to the hole. just another way to beat the drill size and over cut problems.:(
 
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