3/4-16 UNF Thread Specs
Standard: ASME B1.1 (UNF)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the 3/4-16 UNF unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 0.75 inches (19.05 mm) with a pitch of 0.0625 inches (TPI of 16).
For general engineering or fastening, the standard recommended tap drill is 0.6875 inches (17.46 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
3/4-16 UNF
Major Diameter (Nominal)
0.75 in(19.05 mm)
TPI (Threads per Inch)
16
Pitch
0.0625 in
Pitch Diameter
0.7094 in(18.02 mm)
Minor Diameter (Ext)
0.6823 in(17.33 mm)
Minor Diameter (Int)
0.6891 in(17.5 mm)
Thread Height
0.0541 in
Drilling & Strength Specs
Tap Drill Size
0.6875 in(17.46 mm)
Stress Area
0.373 in²(240.62 mm²)
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Frequently Asked Questions
What is the tap drill size for 3/4-16 UNF?
The recommended tap drill size for a 3/4-16 UNF thread is 0.6875 inches (approx. 17.46 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a 3/4-16 UNF bolt have?
A standard 3/4-16 UNF thread has exactly 16 threads per inch (TPI), with a corresponding linear pitch of 0.0625 inches.
What is the major diameter of a 3/4-16 UNF thread in millimeters?
The nominal major diameter of a 3/4-16 UNF thread is 0.75 inches, which converts to 19.05 mm.