#5-44 UNF Thread Specs
Standard: ASME B1.1 (UNF)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the #5-44 UNF unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 0.125 inches (3.18 mm) with a pitch of 0.02273 inches (TPI of 44).
For general engineering or fastening, the standard recommended tap drill is 0.1023 inches (2.6 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
#5-44 UNF
Major Diameter (Nominal)
0.125 in(3.18 mm)
TPI (Threads per Inch)
44
Pitch
0.02273 in
Pitch Diameter
0.1102 in(2.8 mm)
Minor Diameter (Ext)
0.1004 in(2.55 mm)
Minor Diameter (Int)
0.1029 in(2.61 mm)
Thread Height
0.0197 in
Drilling & Strength Specs
Tap Drill Size
0.1023 in(2.6 mm)
Stress Area
0.0083 in²(5.36 mm²)
Quick Unit Converter
mm
⇄
inch
Frequently Asked Questions
What is the tap drill size for #5-44 UNF?
The recommended tap drill size for a #5-44 UNF thread is 0.1023 inches (approx. 2.6 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a #5-44 UNF bolt have?
A standard #5-44 UNF thread has exactly 44 threads per inch (TPI), with a corresponding linear pitch of 0.02273 inches.
What is the major diameter of a #5-44 UNF thread in millimeters?
The nominal major diameter of a #5-44 UNF thread is 0.125 inches, which converts to 3.18 mm.