5/8-24 UNEF Thread Specs
Standard: ASME B1.1 (UNEF)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the 5/8-24 UNEF unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 0.625 inches (15.88 mm) with a pitch of 0.04167 inches (TPI of 24).
For general engineering or fastening, the standard recommended tap drill is 0.5833 inches (14.82 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
5/8-24 UNEF
Major Diameter (Nominal)
0.625 in(15.88 mm)
TPI (Threads per Inch)
24
Pitch
0.04167 in
Pitch Diameter
0.5979 in(15.19 mm)
Minor Diameter (Ext)
0.5799 in(14.73 mm)
Minor Diameter (Int)
0.5844 in(14.84 mm)
Thread Height
0.0361 in
Drilling & Strength Specs
Tap Drill Size
0.5833 in(14.82 mm)
Stress Area
0.2682 in²(173.05 mm²)
Quick Unit Converter
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Frequently Asked Questions
What is the tap drill size for 5/8-24 UNEF?
The recommended tap drill size for a 5/8-24 UNEF thread is 0.5833 inches (approx. 14.82 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a 5/8-24 UNEF bolt have?
A standard 5/8-24 UNEF thread has exactly 24 threads per inch (TPI), with a corresponding linear pitch of 0.04167 inches.
What is the major diameter of a 5/8-24 UNEF thread in millimeters?
The nominal major diameter of a 5/8-24 UNEF thread is 0.625 inches, which converts to 15.88 mm.