STANDARD PERFORATIONS:

The flexibility of round, square, slot and other special perforations make it impractical to list every combination. For complete information, call
Metals, Inc.

PURPOSE AND SCOPE:

The standards published here are intended as a guide to designers, engineers and buyers of perforated metal.

PERFORATIONS:

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 - Please call us.

PATTERN OF PERFORATIONS:

Unfinished End Pattern - The condition which occurs with some specifications of staggered pattern perforations as a result of tool design. On one end of the plate, the pattern will appear to be incomplete due to unperforated holes in the even-numbered rows while on the other end of the same plate, the pattern will appear to be incomplete due to unperforated holes in the odd-numbered rows.

Finished End Pattern - The condition which occurs with some specifications of staggered pattern perforations as a result of tool design, where the pattern is completed on both ends of the plate.

Staggered Perforations, both Round and Square - Direction of the stagger will normally be the short dimension of the sheet. Straight row of holes is normally parallel to long dimension of sheet.

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 us.

SHEET AND PLATE SIZE SPECIFICATION

Standard Stock Size Sheets and Plates-
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.

SPACING OF PERFORATIONS:

Spacing for larger 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.

MARGINS:

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.

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. Unfinished end pattern is standard in the industry.

FLATNESS OF SHEETS AND PLATES:

In the majority of requirements, Perforated Sheets or Plates can be furnished to AISI flattness tolerances.

If your needs fall under one of the following categories, please call Metals, Inc. for help in ordering:

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.

PERFORATING AND PROCESSING ONLY:

If you are supplying the material, use the terminology "Perforating and Processing Only". All material so furnished must be of perforating quality.

OTHER INFORMATION:

If other work is required in addition to perforating, submit complete details including sketches.

FILTERS

PUMPS

EXAMPLE OF
" UNFINISHED END PATTERN"

EXAMPLE OF
"FINISHED END PATTERN"

STANDARD STOCK SIZE SHEET OR PLATE WITH MINIMUM MARGINS

TYPES OF PERFORATIONS AVAILABLE:

1/2" diameter. 11/16" staggered centers.
2.5 holes sq. in. 48% open area.

.027" diameter.
11/16" Straight line.
400 holes sq. in. 23% open area.

5/32" diameter. 3/16" Staggered.
63% open area.

1/4" diameter. 3/8" Staggerd.
42% open area.

CARBON STEEL | STAINLESS STEEL | ALUMINUM