1-3/4-5 UNC Thread Specs
Standard: ASME B1.1 (UNC)
Find the technical dimensions, threads per inch (TPI), and tapping guidelines for the 1-3/4-5 UNC unified thread.
Compliant with the ASME B1.1 standard, this size has a nominal major diameter of 1.75 inches (44.45 mm) with a pitch of 0.2 inches (TPI of 5).
For general engineering or fastening, the standard recommended tap drill is 1.55 inches (39.37 mm) to achieve adequate thread engagement.
Dimensional Specifications (Inches & mm)
Size Designation
1-3/4-5 UNC
Major Diameter (Nominal)
1.75 in(44.45 mm)
TPI (Threads per Inch)
5
Pitch
0.2 in
Pitch Diameter
1.6201 in(41.15 mm)
Minor Diameter (Ext)
1.5335 in(38.95 mm)
Minor Diameter (Int)
1.5551 in(39.5 mm)
Thread Height
0.1732 in
Drilling & Strength Specs
Tap Drill Size
1.55 in(39.37 mm)
Stress Area
1.8995 in²(1225.45 mm²)
Quick Unit Converter
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Frequently Asked Questions
What is the tap drill size for 1-3/4-5 UNC?
The recommended tap drill size for a 1-3/4-5 UNC thread is 1.55 inches (approx. 39.37 mm) to achieve standard thread engagement.
How many threads per inch (TPI) does a 1-3/4-5 UNC bolt have?
A standard 1-3/4-5 UNC thread has exactly 5 threads per inch (TPI), with a corresponding linear pitch of 0.2 inches.
What is the major diameter of a 1-3/4-5 UNC thread in millimeters?
The nominal major diameter of a 1-3/4-5 UNC thread is 1.75 inches, which converts to 44.45 mm.