Found a site with the thread data, it's a little smashed together down there,
but you'll see the 1/8-28 listed. ( for some reason the column headings went
vertical, and the data stayed horizontal when I pasted it in)
John.
PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPF
PIPE THREAD -- JAPANESE PIPE PARALLEL -- PF
Click here to return to the thread data chart page index.
MARYLAND METRICS -- THREAD DATA CHART:
British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
Nominal
Size
BSPP/BSPF Thread
Form
Type Major
Diameter
mm
d=D Pitch
mm
p Threads
per
inch
tpi Pitch
Diameter
mm
d2=D2 Minor
Diameter
Male Thd.
d3 Thread
Height
H1 Tap
Drill
Diameter
mm
1/8" BSPP/BSPF 9.728 0.907 28 9.147 8.566 0.581 8.70
1/4" BSPP/BSPF 13.157 1.337 19 12.301 11.445 0.856 11
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