Side-by-Side Comparison
Imperial Threads (UNC/UNF)
#10-24 UNC vs. #2-56 UNC
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
#10-24 UNC
#2-56 UNC
10-24 UNC is a numbered Unified Coarse machine screw thread with a major diameter of 0.1900 inches (4.826 mm) and 24 threads per inch (TPI). Requiring a #25 (0.1495 inch) tap drill, it provides high clamping torque for household appliances, outdoor power equipment, and light mechanical assemblies.
2-56 UNC is a numbered miniature Unified Coarse machine screw thread with a major diameter of 0.0860 inches (2.184 mm) and 56 threads per inch (TPI). Requiring a #50 (0.0700 inch) tap drill, it is widely used in precision model engineering, musical instrument pickups, and micro-electromechanical assemblies.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nominal Major Diameter
|
0.1900 in (4.826 mm) | 0.0860 in (2.184 mm) |
|
Threads Per Inch (TPI)
|
24 TPI (Coarse pitch: 1.058 mm) | 56 TPI (Coarse pitch: 0.454 mm) |
|
Fine Pitch Equivalent
|
#10-32 UNF (0.794 mm pitch — widely used in 19" AV racks) | #2-64 UNF (0.397 mm pitch) |
|
Minor Diameter (Internal)
|
0.1449 in (3.680 mm) | 0.0667 in (1.694 mm) |
|
Tensile Stress Area
|
0.0175 in² (11.3 mm²) | 0.00370 in² (2.39 mm²) |
|
Tap Drill Size (UNC)
|
#25 drill bit (0.1495 in / 3.80 mm) | — |
|
Tap Drill Size (#10-32 UNF)
|
#21 drill bit (0.1590 in / 4.04 mm) | — |
|
Recommended Tap Drill Size
|
— | #50 drill bit (0.0700 in / 1.78 mm) |
|
Thread Profile Angle
|
— | 60 degrees |