Perforation Specifications

Tolerances

Flatness of Sheets and Plates

In the majority of requirements, Perforating Sheets can be furnished to AISI flatness tolerances (See table below). Before ordering any of the following special requirements, discuss them with our sales department.

  • 1. Perforated sheets with extra wide margins.
  • 2. Blank areas required within the perforated area.
  • 3. Perforated sheets with very large percentage of open area.
  • 4. Heavy gauge metal in relation to the size of perforation.
  • 5. Special alloys.
  • 6. Stretcher leveled sheets.

Perforating and Processing Only

When the material is to be furnished by the customer, we use the terminology "Perforating and Processing Only." All material so furnished must be of perforating quality. The weight of material furnished to us, refers to the weight before perforating.

Other Information

If other work is required in addition to perforating, click on value added capabilities.

Flatness Tolerances of Sheets

(From AISI Steel Products Manual 12/60)

Hot Rolled Sheets

For Sheets Not Specified to Stretcher Leveled Standard of Flatness, including Pickled Sheets.

Cold Rolled Sheets

For sheets over 12" in width not specified to Stretcher Leveled Standard of Flatness.



Thickness of Steel Widths Flatness Tolerance (max. deviation
from a horizontal flat surface)
16 ga. &heavier To 60"incl.
Over 60" to 72" incl.
Over 72" 		1/2"
3/4"
1"
17 ga. &lighter To 36"incl.
Over 36" to 60" incl.
Over 60"		 1/2"
3/4"
1"

Flatness Tolerances of Plates

(From AISI Steel Products Manual 12/57)


Flatness Tolerances for specified widths
Thickness of Steel To 36" to 48"
excl.		 36" to 48"
excl.		 48" to 60"
excl.		 60" to 72"
excl.		 72" to 84"
excl.
To 1/4"excl. 5/8" 7/8" 1-1/16" 1-3/8" 1-1/2"
1/4" to 3/8" excl. 9/16" 3/4" 7/8" 1-1/16" 1-1/4"

Only those portions of the AISI tables that pertain to the commonly used sizes and gages in the perforating industry are included above. See AISI Steel Product Manual, table 6-12 for complete specifications.