UNFfine60° flankASME B1.1

#5-44 UNF Thread Dimensions

#5-44 UNF is a Unified National Fine thread. There are 44 threads per inch on a 0.125 in major diameter, giving a metric-equivalent pitch of 0.577 mm. The recommended tap drill is nominal diameter minus pitch.

Major Ø0.125 in
Threads per inch44
Pitch (metric)0.577 mm
Pitch Ø0.1102 in
Tap drill0.1023 in

Thread profile

millimetres unless stated
Thread profile — #5-44 UNFd 3.175d2 2.8d3 2.47mm60°P 0.577h3 0.354tap ⌀2.598
#5-44 UNF — basic profile60° flank angle · Not to scale

Basic information

Designation
#5-44 UNF
Thread system
Unified National Fine
Series
fine
Standard
ASME B1.1
Basic profile
Unified basic profile
Flank angle
60°

Dimensions

Major diameter
0.125 in / 3.175 mm
Pitch (metric equivalent)
0.577 mm
Threads per inch
44
Pitch diameter
0.1102 in / 2.8 mm
Minor diameter (external)
0.0972 in / 2.47 mm
Minor diameter (internal)
0.1004 in / 2.55 mm
Thread depth
0.0139 in / 0.354 mm
Recommended tap drill
Ø 0.1023 in / 2.598 mm

How these values are derived

computed from the basic profile

These figures follow the Unified basic profile of ASME B1.1. A 60° basic profile has a fundamental triangle height H = 0.866025 × P, with pitch diameter d₂ = d − 0.649519 × P, external minor diameter d₃ = d − 1.226869 × P and internal minor diameter D₁ = d − 1.082532 × P; the two minor diameters differ because the external root is rounded while the internal crest is truncated. The recommended tap drill is given as nominal diameter minus pitch, which approximates 75% thread engagement — adjust it for tough materials or deep holes.

Compatible parts0 specification pages

No specification in this database uses #5-44 UNF yet.

Related

Neighbouring sizes in Unified National Fine.

#1-72 UNF#2-64 UNF#3-56 UNF#4-48 UNF#6-40 UNF#8-36 UNF#10-32 UNF#12-28 UNF