11/16-24 UNEF Thread Specs
Standard: ASME B1.1 (UNEF)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the 11/16-24 UNEF unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 0.6875 inches (17.46 mm) with a pitch of 0.04167 inches (TPI of 24).
For general engineering or fastening, the standard recommended tap drill is 0.6458 inches (16.4 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
11/16-24 UNEF
Major Diameter (Nominal)
0.6875 in(17.46 mm)
TPI (Threads per Inch)
24
Pitch
0.04167 in
Pitch Diameter
0.6604 in(16.78 mm)
Minor Diameter (Ext)
0.6424 in(16.32 mm)
Minor Diameter (Int)
0.6469 in(16.43 mm)
Thread Height
0.0361 in
Drilling & Strength Specs
Tap Drill Size
0.6458 in(16.4 mm)
Stress Area
0.3287 in²(212.05 mm²)
Quick Unit Converter
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Frequently Asked Questions
What is the tap drill size for 11/16-24 UNEF?
The recommended tap drill size for a 11/16-24 UNEF thread is 0.6458 inches (approx. 16.4 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a 11/16-24 UNEF bolt have?
A standard 11/16-24 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 11/16-24 UNEF thread in millimeters?
The nominal major diameter of a 11/16-24 UNEF thread is 0.6875 inches, which converts to 17.46 mm.