PURPOSE AND SCOPE
The standards published in this bulletin are intended as a guide to Designers, Engineers, and Buyers of Perforated metal. For purposes of clarity, the Industrial Perforators Association is adopting general terminology listed in this bulletin.
The tolerances shown are not the ultimate and where closer tolerances are required, contact your perforator to discuss your specific design needs.
1. SHEET AND PLATE SIZE SPECIFICATION
1a. Standard Stock Size Sheets and Plates
(Typical: 36" x 96", 36" x 120", 48" x 96", 48" x 120")
The width and length will be standard mill shearing plus any stretch of the material by perforating, unless otherwise specified. For carbon steel sheets or plates, tolerances as set by the American Iron and Steel Institute.
1b. Sheets and Plates Resheared After Perforating.
Tolerances of the width and length will be:
For thickness lighter than 1/8" ±1/32"
For thickness 1/8" to 3/16" incl. ±1/16"
For thickness heavier than 3/16" to 1/2" incl. ±1/8"
For thickness heavier than 3/16" to 1/2" - check with your perforator.
If special re-square tolerances are required, consult your perforator.
1c. Coiled Stock - Please submit specifications.
2. THICKNESS OF METALS
STEEL - Use "Manufacturers' Standard Gage for Steel Sheets."
STAINLESS STEEL - Use the U.S. Standard Gage Table.
MONEL - Use the U.S. Standard Gage Table.
COPPER, BRASS OR MUNTZ - Use the B&S Gage Table.
ALUMINUM - Use the B&S Gage Table.
3. PERFORATIONS (Click HERE to View)
ROUND PERFORATIONS - Staggered (60 degree pattern) is standard. Variations include 45 degree staggered, and Straight Line Pattern.
SQUARE PERFORATIONS - Staggered Pattern or Straight Line Pattern.
SLOTTED PERFORATIONS - Side Staggered, End Staggered, or Straight Lines. Slotted Perforations will be round end slots; specify if square end slots are required.
OTHER PERFORATIONS - See your perforator.
4. SPACING OF PERFORATIONS
Spacing for large perforations will be designated by either Centers of Perforations, or by the Open Area required. Spacing for small perforations will be designated by either Centers, or Open Area, or if more practical, by the Number of Perforations to the Square Inch.
5. PATTERN OF PERFORATIONS
5a. Staggered Perforations, both Round and Square -Direction of the stagger will normally be the short dimension of the sheet, as illustrated. The straight row of holes is normally parallel to long dimension of sheet.
5b. Slotted Perforations -The long dimension of the slots can be furnished parallel with either the width or length of the sheet in most cases -check with your perforator.
6. MARGINS
6a. Perforated Stock Size Sheets and Plates. The long sides of the sheet will be supplied with minimum margins. The short sides of the sheet will have either minimum margins or no margins. (Refer to Fig. #3)
6b. Sheets and plates Resheared after Perforating. Special margins are available to specifications but they must carry a tolerance within the limits of the perforating tool.
6c. Unfinished end pattern is standard in the industry. Note: See illustration of "Finished End Pattern" (Fig. #2) and "Unfinished End Pattern." (Fig. #1)
7. FLATNESS OF SHEETS AND PLATES
In the majority of requirements, Perforated Sheets or Plates can be furnished to AISI flatness tolerances. (No more than 1/2" on 16 ga. sheets to 60" wide.)
If your job should fall under one of the following categories, it is recommended that you discuss the requirement with your perforator:
(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 gage metal in relation to the size of the perforation.
(5) Special Alloys.
(6) Stretcher Leveled Sheets.
8. PERFORATING AND PROCESSING ONLY
When the material is to be furnished by the customer, use the terminology "Perforating and Processing Only." All material so furnished must be of perforating quality.
9. STANDARD HOOK FLANGES
Unless otherwise specified, hook flanges may be supplied for the following standards:
