2"-16 UNEF Thread Specs
Standard: ASME B1.1 (UNEF)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the 2"-16 UNEF unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 2 inches (50.8 mm) with a pitch of 0.0625 inches (TPI of 16).
For general engineering or fastening, the standard recommended tap drill is 1.9375 inches (49.21 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
2"-16 UNEF
Major Diameter (Nominal)
2 in(50.8 mm)
TPI (Threads per Inch)
16
Pitch
0.0625 in
Pitch Diameter
1.9594 in(49.77 mm)
Minor Diameter (Ext)
1.9323 in(49.08 mm)
Minor Diameter (Int)
1.9391 in(49.25 mm)
Thread Height
0.0541 in
Drilling & Strength Specs
Tap Drill Size
1.9375 in(49.21 mm)
Stress Area
2.9532 in²(1905.29 mm²)
Quick Unit Converter
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Frequently Asked Questions
What is the tap drill size for 2"-16 UNEF?
The recommended tap drill size for a 2"-16 UNEF thread is 1.9375 inches (approx. 49.21 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a 2"-16 UNEF bolt have?
A standard 2"-16 UNEF thread has exactly 16 threads per inch (TPI), with a corresponding linear pitch of 0.0625 inches.
What is the major diameter of a 2"-16 UNEF thread in millimeters?
The nominal major diameter of a 2"-16 UNEF thread is 2 inches, which converts to 50.8 mm.