Drilling Precautions

DRILLING PRECAUTIONS

1. Holes that would weaken the frame sidemember should not be drilled in the frame.
2. Holes are not to be drilled in the sidemember s top or bottom flange.
3. Holes to mount brackets, out-riggers and supports may be drilled in the vertical frame side rail web with the following restrictions:
- Material between edge of hole and inside of upper or lower flange must not be less than 1.50 inch for low carbon steel (36,000 psi yield).
- The minimum edge distance between any 2 holes up to 5/8 inch diameter must be 1.00 inch. For larger than 5/8 inch diameter holes, the minimum edge distance must be 1.5 times the diameter of the largest hole.
- No holes will be allowed to exceed 0.75 inch in diameter.
- Avoid close vertical succession of fasteners.
- All attaching fasteners, including flat washers, must be of high strength steel (Grade 8).