Perforated material punched with square holes.

Material Selection -

· Aluminum 3003H14	· Inconel 600
· Aluminum 5005H32	· Monel 400
· Aluminum 5005H34	· Polypropylene
· Aluminum 5052H34	· NS 280 Brinnel Steel
· Aluminum 6061T6	· Plain Steel
· Brass	· Pre-Galvanized
· Bronze	· PVC Gray
· Copper	· Stainless Steel 304-L
· Galvanized	· Stainless Steel 304
· Hastelloy C	· Stainless Steel 316-L
· High-Carbon Steel	· Stainless Steel 316
· Hot Rolled and Pickled and Oiled	· Titanium

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Hole Pattern


Hole pattern is the arrangement of holes on a sheet - either staggered or straight rows. In a staggered hole pattern, the direction of the stagger will normally be parallel to the short dimension of the sheet. Staggered is available by special order.

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Hole Size


Hole size is the length of one side of the square hole. McNICHOLS has a wide range of square hole sizes in stock and can special order any hole size required as long as it meets the minimum hole size requirements.

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Guidelines for Minimum Hole Size

As a rule of thumb, the hole diameter should be at least the same size as the thickness of the perforated material or larger. Preferably, the hole should be at least twice the size of the material thickness. As the hole diameter approaches the material thickness, the higher probability of tool failure. Modifications can be made in certain instances at additional costs. For stainless steel and similar higher-strength materials, it is preferable to specify a hole size at least three times the thickness of the material.

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Hole Center

Hole Center is the distance from the center of one hole to the center of the nearest hole in the next adjoining row. Hole center is one of two measures of perforation spacing. The other is open area. Because hole center and open area measure essentially the same property (perforation spacing), you need specify only one or the other, not both.

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Bar Width

Bar width is the measure of the material between the outer edge of one hole to the outer edge of the nearest hole. If you specify bar width, be be sure that the bar size meets the guidelines for minimum bar width.

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Guidelines for Minimum Bar Width


As a rule of thumb, the bar width should larger than material’s thickness. Preferably, the bar will be at least twice the material’s thickness. For stainless steel and similar higher-strength materials, specify a bar width at least three times the material thickness.

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Open Area


Perforated sheets contain holes and material. Open area is the total area of the holes divided by the total area of the sheet and is expressed as a percent. In other words, open area describes how much of a sheet is occupied by holes. If a perforated sheet has 60 percent open area, then 60 percent of the sheet is holes and 40 percent is material. This open area table provides a quick way to determine open area for perforated sheets with a square hole pattern.

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Thickness or Gauge


Thickness is the measurement from the top surface to bottom surface of the material. Gauge is the most common measurement, but thickness can also be measured in fractional inches or millimeters. This conversion calculator provides easy conversion from one unit of measure to another.

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End Patterns


End pattern is the pattern of the perforations at the beginning and the end of the sheet. End patterns are either finished or unfinished. An unfinished end pattern is standard. A finished end pattern requires special tooling and is typically more expensive.

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Length and Width

Length is the overall measurement of the long side of the sheet; width is the overall measurement of the short side of the sheet. Note that mill tolerances for length and width apply to stock sheets unless otherwise specified. If you have a stock sheet cut-to-size, cut tolerances apply. To specify other than standard tolerances, please use the perforated square hole pattern quote form to specify the exact tolerances you desire.

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Quantity

Quantity is the number of full sheets or cut pieces you need. Unless otherwise specified, the standard tolerance on quantity is Exact Quantity. In other words, McNICHOLS will deliver the exact quantity you specify.

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Margins


Margins are the blank (unperforated) area along the edges of the sheet. For stock sheets, the standard is minimum margins along the length and no margins along the width. To specify other than standard margins, use the perforated square hole pattern quote form. Provide the width of each margin on all four sides (measured from the edge of the sheet to the edge of the first hole) and the direction to which the margin is parallel (side or length dimension). Manufacturing considerations may affect margins. If the margins requested are not possible, the quote you receive will specify the new margins. Below is an example of a margin specification based on the illustration to the right: · 1 inch margins parallel to both 25 inch dimensions · 0.5 inch margins parallel to both 48 inch dimensions

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Margins on Cut Pieces

When stock sheets are cut to a smaller size, the cut pieces will have no margins.

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Tolerances

There are tolerances on quantity, shearing, circle shearing, flatness, thickness, and squareness for perforated products. If you do not specify a specific tolerance, the standard tolerance applies. Tolerances can be specified on the perforated square hole pattern quote form.

More information on tolerances.

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Item		Description	Qty

	1695121841 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Cold Rolled, 18 Gauge, .200" Square on 1/2" Centers, Straight Row Hole Pattern, 16% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1697001638 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Cold Rolled, 16 Gauge, 3/8" Square on 1/2" Centers, Straight Row Hole Pattern, 56% Open Area, Mill Finish, Sheet, 36.0000" Width x 96.0000" Length Add to cart to see price. Click here to cut this item to size
	1697001641 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Cold Rolled, 16 Gauge, 3/8" Square on 1/2" Centers, Straight Row Hole Pattern, 56% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1687001641 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Cold Rolled, 16 Gauge, 1/2" Square on 11/16" Centers, Straight Row Hole Pattern, 53% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1687001241 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Hot Rolled, 12 Gauge, 1/2" Square on 11/16" Centers, Straight Row Hole Pattern, 53% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1698001641 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Cold Rolled, 16 Gauge, 3/4" Square on 1" Centers, Straight Row Hole Pattern, 56% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1698001141 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Plain Steel Hot Rolled, 11 Gauge, 3/4" Square on 1" Centers, Straight Row Hole Pattern, 56% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1725753241 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Aluminum Type 5052-H32, .032 Gauge, 1/4" Square on 3/4" Centers, Straight Row Hole Pattern, 11% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1796005048 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Aluminum Type 3003-H14, .050 Gauge, 5/16" Square on 1/2" Centers, Straight Row Hole Pattern, 39% Open Area, Mill Finish, Sheet, 48.0000" Width x 96.0000" Length Add to cart to see price. Click here to cut this item to size
	1796003241 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Aluminum Type 3003-H14, .032 Gauge, 3/8" Square on 1/2" Centers, Straight Row Hole Pattern, 56% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1787005041 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Aluminum Type 3003-H14, .050 Gauge, 1/2" Square on 11/16" Centers, Straight Row Hole Pattern, 53% Open Area, Mill Finish, Sheet, 48.0000" Width x 120.0000" Length Add to cart to see price. Click here to cut this item to size
	1787006348 Compare	McNICHOLS� Quality Perforated Metal, Square Pattern, Aluminum Type 3003-H14, .063 Gauge, 1/2" Square on 11/16" Centers, Straight Row Hole Pattern, 53% Open Area, Mill Finish, Sheet, 48.0000" Width x 96.0000" Length Add to cart to see price. Click here to cut this item to size

McNICHOLS® Quality Perforated - Square Hole Products