ASME B18.2.2 Sight Hole Coupling Nuts
ASME B18.2.2 sight hole coupling nuts are inch-series hexagon coupling nuts featuring a drilled inspection hole through one side. This hole serves as a visual aid to verify that threaded rods inserted from both ends meet at the center of the nut, ensuring proper thread engagement. These nuts are commonly used in structural and heavy-duty applications where joint integrity is critical.
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Product introduction
ASME B18.2.2 sight hole coupling nuts are inch-series hexagon coupling nuts featuring a drilled inspection hole through one side. This hole serves as a visual aid to verify that threaded rods inserted from both ends meet at the center of the nut, ensuring proper thread engagement. These nuts are commonly used in structural and heavy-duty applications where joint integrity is critical.
Common Specifications
|
Materials |
Carbon steel |
|
Class |
5, 6, 8, 10, 12 |
|
Range |
1/4″ – 2 1/2″ |
|
Thread |
UNC, UNF |
|
Surface |
Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc. |
Key Features
- Sight hole drilled through one side at mid-thickness for visual inspection
- Ensures both threaded rods engage approximately half the nut length
- Hole diameter: 0.2 to 0.4 × nominal size (for sizes ≤ 2½″)
- Standard length approximately 3 × nominal diameter
- Conforms to ASME B18.2.2dimensional specifications
Application industry
- Structural steel tensioning systems
- Anchor bolt extensions
- Overhead crane and hoist assemblies
- Bridge and infrastructure construction
- Heavy equipment maintenance and repair
data table
| Size | 1/4 | 5/16 | 3/8 | 7/16 | 1/2 | 9/16 | 5/8 | 3/4 | 7/8 | 1 | 1-1/8 | 1-1/4 | 1-1/2 | 1-5/8 | 1-3/4 | 1-7/8 | 2 | 2-1/4 | 2-1/2 | 2-3/4 | 3 | 3-1/4 | 3-1/2 | 3-3/4 | 4 |
| UNC | 20 | 18 | 16 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 5 | 5 | 6 | 4.5 | 4.5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| s Min (inch) | 0.428 | 0.489 | 0.551 | 0.607 | 0.663 | 0.782 | 0.782 | 0.963 | 1.212 | 1.325 | 1.450 | 1.575 | 1.950 | 2.481 | 2.662 | 2.844 | 3.025 | 3.388 | 3.750 | 4.112 | 4.475 | 4.838 | 5.200 | 5.562 | 5.925 |
| s Max (inch) | 0.438 | 0.500 | 0.562 | 0.625 | 0.688 | 0.813 | 0.813 | 1.000 | 1.250 | 1.375 | 1.500 | 1.625 | 2.000 | 2.562 | 2.750 | 2.938 | 3.125 | 3.500 | 3.875 | 4.250 | 4.625 | 5.000 | 5.375 | 5.750 | 6.125 |
| e Min (inch) | 0.488 | 0.557 | 0.628 | 0.692 | 0.756 | 0.891 | 0.891 | 1.097 | 1.382 | 1.511 | 1.653 | 1.825 | 2.275 | 2.828 | 3.035 | 3.242 | 3.448 | 3.862 | 4.275 | 4.688 | 5.101 | 5.515 | 5.928 | 6.340 | 6.754 |
| e Max (inch) | 0.505 | 0.577 | 0.650 | 0.722 | 0.794 | 0.939 | 0.939 | 1.155 | 1.443 | 1.588 | 1.732 | 1.876 | 2.309 | 2.959 | 3.175 | 3.392 | 3.608 | 4.041 | 4.474 | 4.907 | 5.340 | 5.773 | 6.206 | 6.639 | 7.072 |
| m Min (inch) | 1.690 | 1.690 | 1.690 | 1.690 | 1.690 | 2.067 | 2.067 | 2.190 | 2.440 | 2.690 | 2.940 | 2.940 | 3.440 | 4.830 | 5.210 | 5.580 | 5.950 | 6.700 | 7.440 | 8.190 | 8.940 | 9.680 | 10.430 | 11.170 | 11.920 |
| m Max (inch) | 1.760 | 1.760 | 1.760 | 1.760 | 1.760 | 2.135 | 2.135 | 2.260 | 2.510 | 2.760 | 3.010 | 3.010 | 3.510 | 4.910 | 5.290 | 5.670 | 6.040 | 6.800 | 7.550 | 8.310 | 9.060 | 9.810 | 10.570 | 11.320 | 12.080 |
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