#10-24 UNC Thread Specs
Standard: ASME B1.1 (UNC)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the #10-24 UNC unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 0.19 inches (4.83 mm) with a pitch of 0.04167 inches (TPI of 24).
For general engineering or fastening, the standard recommended tap drill is 0.1483 inches (3.77 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
#10-24 UNC
Major Diameter (Nominal)
0.19 in(4.83 mm)
TPI (Threads per Inch)
24
Pitch
0.04167 in
Pitch Diameter
0.1629 in(4.14 mm)
Minor Diameter (Ext)
0.1449 in(3.68 mm)
Minor Diameter (Int)
0.1494 in(3.79 mm)
Thread Height
0.0361 in
Drilling & Strength Specs
Tap Drill Size
0.1483 in(3.77 mm)
Stress Area
0.0175 in²(11.31 mm²)
Quick Unit Converter
mm
⇄
inch
Frequently Asked Questions
What is the tap drill size for #10-24 UNC?
The recommended tap drill size for a #10-24 UNC thread is 0.1483 inches (approx. 3.77 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a #10-24 UNC bolt have?
A standard #10-24 UNC thread has exactly 24 threads per inch (TPI), with a corresponding linear pitch of 0.04167 inches.
What is the major diameter of a #10-24 UNC thread in millimeters?
The nominal major diameter of a #10-24 UNC thread is 0.19 inches, which converts to 4.83 mm.