Bolt Hole

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5.1. Bolt Holes

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AISC Specification Table J3.3 is based upon the RCSC Specification Table 3.1 and contains the maximum dimensions of standard, oversized, short-slotted and long-slotted holes. If an actual dimension exceeds the tabulated maximum, it must be treated as the next larger hole size. For example, a 13∕16-in. by 1¼-in. slotted hole for a ¾-in.-diameter bolt must be treated as a long-slotted hole because it exceeds the maximum short-slotted hole size (13∕16 in. by 1 in.). Note that the RCSC Specification , in the footnote of Table 3.1, allows a 1∕32-in. tolerance on these maximum hole sizes as discussed in 2.4.2 and 2.5.5.
When deformation is a design consideration, the design strength is limited to the force at which the hole edge has deformed by a maximum of ¼ in. When deformation is not a design consideration, larger hole ovalization is permitted as the material attains its maximum bearing strength.
Generally, flame-cutting of bolt holes does not affect connection strength and performance. Iwankiw and Schlafly (1982) investigated the performance of double-lap joints with holes made by punching, punching with burrs removed, sub-punching and reaming, drilling, flame-cutting and flame-cutting and reaming. The comparison of 18 samples using ½-in.-thick ASTM A36 steel plates with standard holes indicated that there is no significant variation in connection strength according to the method of hole formation under static load. Additional considerations may be warranted for much thicker plates, steel grades other than those tested and cyclically loaded structures. Iwankiw, N.R. and Schlafly, T.J. (1982), “Effect of HoleMaking on the Strength of Double Lap Joints,” Engineering Journal, Vol. 19, No. 3, (3rd Qtr.), AISC, Chicago, IL.
Although slip-critical connections are designed to resist slip, a target reliability is established similar to that used in main member design, as opposed to the higher reliability associated with most connection-related limit states. This is allowed and not considered a connection failure since slip would not result in the loss of the connection between the elements. The language in AISC Specification Section J3.8 is to preclude a rupture failure that could result in the loss of the connection between the elements if slip were to occur. In other words, it is intended to provide a consistent level of reliability against a rupture failure.

©2022 American Institute of Steel Construction. All Rights Reserved.

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2.4. Bolt Holes

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Acceptable methods for making bolt holes include:
6. Thermal cutting, subject to surface quality requirements as discussed in 2.4.2
The slightly conical hole that naturally results from punching operations is acceptable, as noted in Table 3.1 of the RCSC Specification . The width of slotted holes that are produced by flame-cutting, or a combination of punching or drilling and flame-cutting, should generally be not more than 1⁄32 in. greater than the nominal width except that gouges not more than 1⁄16 in. deep are permitted. Thermally cut holes subjected to fatigue are not addressed in Appendix 3 of the AISC Specification .
The RCSC Specification Section 3.4 states: "Burrs less than or equal to 1 ⁄16 in. in height are permitted to remain on faying surfaces of all joints . Burrs larger than 1 ⁄16 in. in height shall be removed or reduced to 1 ⁄16 in. or less from the faying surfaces of all joints ."
No. Holes for galvanized bolts or members are not permitted to be larger than those specified in Table 3.1 of the RCSC Specification .

©2022 American Institute of Steel Construction. All Rights Reserved.

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Sexagesimal Degree

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British/ISO pipe thread Tap Drill Size Close
National pipe thread Tap Drill Size Close
Fits for Hole Inch Screw Sizes Close
Fits for Hole Metric Screw Sizes Close

1
2
3
4
5

( Qty:6 ) ( Dia:0.3125 ) ( BCdia:1.25 ) ( StartAngle:0 ) N1 X0.625 Y0.000 N2 X0.313 Y0.541 N3 X-0.313 Y0.541 N4 X-0.625 Y0.000 N5 X-0.313 Y-0.541 N6 X0.313 Y-0.541

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