UNFfine60° flank

#10-32 UNF Thread Dimensions

#10-32 UNF is a fine pitch UNF thread. There are 32 threads per inch, giving a pitch of 0.79 mm. The recommended tap drill leaves roughly 75% thread engagement.

Nominal Ø4.83 mm
Pitch0.79 mm
Threads per inch32
Pitch Ø-8.27 mm
Tap drill-15.34 mm

Thread profile

millimetres unless stated
Thread profile — #10-32 UNFd 4.83d2 -8.27d3 -19.91mm60°P 0.79h3 12.37tap ⌀-15.34
#10-32 UNF — basic profile60° flank angle · Not to scale
Designation
#10-32 UNF
Thread system
UNF
Series
fine
Flank angle
60°
Major diameter
4.83 mm / 0.19"
Pitch
0.79 mm
Threads per inch
32
Pitch diameter
-8.27 mm
Minor diameter (external)
-19.91 mm
Minor diameter (internal)
-17 mm
Thread depth
12.37 mm
Recommended tap drill
Ø -15.34 mm / -0.6038"

How these values are derived

Basic ISO thread geometry uses the fundamental triangle height H = 0.866025 × P. External minor diameter d₃ = d − 1.226869 × P, internal minor diameter D₁ = d − 1.082532 × P. Tap drill is given as nominal diameter minus pitch, which approximates a 75% thread engagement — adjust for tough materials or deep holes.