AISC Bolt Reference.
Hole and slot sizes, minimum bolt spacing and minimum edge distance by bolt diameter.
Holes and edge distance are for standard hole sizes. Always check the governing edition and your connection design.
AISC Table J3.3, 15th Edition.
Minimum: 2⅔d • Preferred: 3d (AISC 360 Section J3.3).
AISC Table J3.4, standard holes (same in both editions).
How to use it
- Choose the AISC edition, 14th or 15th. The hole sizes differ between them for some diameters.
- Pick the bolt diameter from 1/2" to 2", or choose Custom and enter a diameter larger than 2".
- Read the standard, oversize, short-slot and long-slot hole sizes, the minimum and preferred bolt spacing, and the minimum edge distance.
Example
A 3/4" bolt in the 15th Edition: standard hole 13/16", oversize 15/16", short slot 13/16" × 1", long slot 13/16" × 1-7/8", minimum spacing 2", preferred spacing 2-1/4", minimum edge distance 1".
Source and notes
- Hole sizes: AISC Table J3.3. For 1-1/8" and larger the table's formula row is used. The 14th and 15th Editions differ for the 1" bolt and for the formula row.
- Edge distance: AISC Table J3.4 for standard holes, the same in both editions. Above 1-1/4" the table's formula (1.25 d) is used.
- Bolt spacing: minimum 2⅔d and preferred 3d (AISC 360 Section J3.3).
- The AISC tables belong to the American Institute of Steel Construction. They are shown here as a quick reference and may not match the edition or addenda you are required to use.
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