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Recommended Nominal Insert Lengths Based on Parent
Material vs. Bolt Material Strengths |
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Unified Chart |
| Shear Strength of Parent Material (KSI) |
Bolt
Material Minimum |
| Ultimate Tensile Strength (KSI) |
| 54 |
75 |
96 |
108 |
125 |
132 |
160 |
180 |
220 |
| 10 |
2 |
2-1/2 |
3 |
3 |
--- |
--- |
--- |
--- |
--- |
| 15 |
1-1/2 |
1-1/2 |
2 |
2-1/2 |
2-1/2 |
3 |
3 |
--- |
--- |
| 20 |
1 |
1-1/2 |
1-1/2 |
2 |
2 |
2 |
2-1/2 |
3 |
3 |
| 25 |
1 |
1 |
1-1/2 |
1-1/2 |
1-1/2 |
2 |
2 |
2-1/2 |
2-1/2 |
| 30 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
1-1/2 |
2 |
2 |
2-1/2 |
| 40 |
1 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
1-1/2 |
2 |
| 50 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
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Example: If parent material shear strength is 10 KSI and the bolt strength is 54 KSI, the correct insert length is 2 diameters. |
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Metric Chart |
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| Shear Strength of Parent Material (Mpa) |
Bolt
Material Minimum |
| Ultimate Tensile Strength MPa (Mega-Pascal) |
| 300 |
400 |
500 |
600 |
800 |
1000 |
1200 |
1400 |
| 70 |
1-1/2 |
2 |
2-1/2 |
2-1/2 |
--- |
--- |
--- |
--- |
| 100 |
1 |
1-1/2 |
1-1/2 |
2 |
2-1/2 |
3 |
--- |
--- |
| 150 |
1 |
1 |
1-1/2 |
1-1/2 |
2 |
2 |
2-1/2 |
3 |
| 200 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
2 |
2-1/2 |
| 250 |
1 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
2 |
| 300 |
1 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
1-1/2 |
| 350 |
1 |
1 |
1 |
1 |
1 |
1 |
1-1/2 |
1-1/2 |
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Example: If parent material shear strength is 70 MPa and the bolt stregth is 300 Mpa, the correct insert length is 1-1/2 diameters. |
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Notes:
- Bolt tensile strengths are specified minimums.
When choosing an insert length, consideration should be given
the maximum tensile strength allowed by the bolt drawing or
procurement specification.
- Service temperatures can cause significant variations in strength
values, therefore compensation should be allowed.
- The importance of shear values should be kept in mind because the
parent material is subject to shearing stress near the major diameter
of the tapped threads.
- When the strength values fall between two values in the table above,
use next lower material shear value, or the next higher bolt tensile
strength value.
- To achieve maximum strength, bolt length and thread length as well
as full tapped thread-depth must be sufficient to assure full thread
engagement over the entire length of the insert.
- Specific charts detailing load values by thread sizes are available;
contact the KATO Tech-Group for more information.
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