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/ Technical Information / Flatness Tolerances |
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Flatness Tolerances |
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The maximum deviation from a horizontal flat surface -- the material is to be placed on a perfectly flat table. A ruler which does not flatten the material will give the degree of flatness. The measurement being from the highest point (or points) of the sheet or plate to the table surface minus the material thickness. Note: if not otherwise specified, commercial quality is supplied. Flatness tolerances listed are of roller leveled sheets or plates with no or minimum margins. For material 10' or less in length, variation should not exceed amount shown in table. For material longer than 10', the variation in flatness for any 10 feet of length should not exceed the amount shown. Where the longer dimension is under 36", the variation in flatness along the length and across the width should not exceed ¼" in each direction. When the longer dimension is from 36" to 72", the flatness variation should not exceed 75% of the amount shown for the specified width, but in no case less than ¼". Margins will usually increase the maximum deviation, please consult Hendrick Manufacturing Co.
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Three levels of quality are
available: |
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Commercial Quality -- Superior Quality -- Special
Quality |
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REQUIREMENT NOTES |
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If your requirement is
within one of the following categories, it is recommended that you
discuss the flatness requirements of your perforated metal with Hendrick
Manufacturing Company (1-800-225-7373) |
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Category |
Description |
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1 |
Perforated sheets with
other than "safe"
or "no" margins
. |
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2 |
Stresses imposed during the
perforating process
may
cause a deviation in the flatness of the edges.
The wavy edge may occur in perforated sheets and coils with wide
or unequal wide unperforated blank edges
on the long side
or when making special perforations, such as countersunk
or ringed perforations
, especially when using soft
materials such as aluminum or copper. |
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3 |
Blank areas required
within perforated
area
. |
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4 |
Perforated sheets with
very large percentage
of open area
. |
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5 |
When the hole
diameter
and/or bar
between the hole is less than the material thickness. |
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6 |
Special alloys. |
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FLATNESS TABLES |
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To
36" Width |
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Over
36"- 48" Width |
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Over
48"- 60" Width |
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Over
60"- 72" Width |
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Over
72"- 84" Width |
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Over
84"-120" Width |
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Over
120" Wide |
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To
36" Width |
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H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
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Thickness Range |
Tolerance |
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Commercial Quality |
Superior Quality |
Special Quality |
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28-20GA |
3/8" |
5/16" |
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19-16GA |
1/2" |
7/16" |
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15-12GA |
5/8" |
1/2" |
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11GA-1/4" |
5/8" |
1/2" |
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5/16"-3/8" |
9/16" |
15/32" |
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7/16"-1/2" |
1/2" |
7/16" |
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9/16"-3/4" |
7/16" |
11/32" |
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Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
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To
1/4" |
1-5/16" |
1-5/32" |
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1/4"-3/8" |
1-1/4" |
1-1/8" |
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7/16"-1/2" |
1-1/4" |
1-1/8" |
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9/16"-3/4" |
1-1/8" |
1" |
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Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
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30-20GA |
1/2" |
7/16" |
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19-16GA |
5/8" |
1/2" |
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15-12GA |
3/4" |
5/8" |
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11GA-1/4" |
3/4" |
5/8" |
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5/16"-3/8" |
11/16" |
9/16" |
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Aluminum & Copper |
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.012"-.032" |
5/16" |
1/4" |
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.033"-.063" |
7/16" |
11/32" |
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.064"-.125" |
9/16" |
15/32" |
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.126"-.500" |
5/8" |
9/16" |
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.501"-.750" |
11/16" |
5/8" |
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Over
36"- 48" Width |
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H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
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28-20GA |
1/2" |
7/16" |
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19-16GA |
5/8" |
1/2" |
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15-12GA |
3/4" |
5/8" |
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11GA-1/4" |
7/8" |
23/32" |
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5/16"-3/8" |
3/4" |
5/8" |
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7/16"-1/2" |
5/8" |
1/2" |
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9/16"-3/4" |
9/16" |
15/32" |
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Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
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To
1/4" |
1-5/8" |
1-7/16" |
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1/4"-3/8" |
1-7/16" |
1-1/4" |
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7/16"-1/2" |
1-3/8" |
1-7/32" |
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9/16"-3/4" |
1-1/4" |
1-1/8" |
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Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
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30-20GA |
5/8" |
1/2" |
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19-16GA |
3/4" |
5/8" |
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15-12GA |
7/8" |
23/32" |
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11GA-1/4" |
1" |
13/16" |
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5/16"-3/8" |
13/16" |
21/32" |
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Aluminum & Copper |
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.012"-.032" |
7/16" |
11/32" |
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.033"-.063" |
9/16" |
15/32" |
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.064"-.125" |
11/16" |
9/16" |
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.126"-.500" |
3/4" |
11/16" |
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.501"-.750 |
13/16" |
3/4" |
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Over
48"- 60" Width |
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H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
|
28-20GA |
5/8" |
1/2" |
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19-16GA |
3/4" |
5/8" |
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15-12GA |
1" |
13/16" |
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11GA-1/4" |
1-1/16" |
27/32" |
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5/16"-3/8" |
7/8" |
23/32" |
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7/16"-1/2" |
11/16" |
9/16" |
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9/16"-3/4" |
5/8" |
1/2" |
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Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
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To
1/4" |
1-7/8" |
1-5/8" |
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1/4"-3/8" |
1-5/8" |
1-7/16" |
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7/16"-1/2" |
1-7/16" |
1-1/4" |
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9/16"-3/4" |
1-5/16" |
1-5/32" |
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Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
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30-20GA |
3/4" |
5/8" |
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19-16GA |
1" |
13/16" |
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15-12GA |
1-1/8" |
15/16" |
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11GA-1/4" |
1-3/16" |
31/32" |
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5/16"-3/8" |
7/8" |
23/32" |
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Aluminum & Copper |
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.012"-.032" |
9/16" |
15/32" |
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.033"-.063" |
11/16" |
9/16" |
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.064"-.125" |
15/16" |
3/4" |
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.126"-.500" |
13/16" |
3/4" |
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.501"-.750" |
3/4" |
11/16" |
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Over
60"- 72" Width |
|
H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
|
28-20GA |
3/4" |
5/8" |
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19-16GA |
1" |
13/16" |
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15-12GA |
1-1/4" |
1" |
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11GA-1/4" |
1-3/8" |
1-1/8" |
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5/16"-3/8" |
1-1/16" |
27/32" |
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7/16"-1/2" |
3/4" |
5/8" |
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9/16"-3/4" |
11/16" |
9/16" |
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Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
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To
1/4" |
2-3/8" |
2" |
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1/4"-3/8" |
1-7/8" |
1-5/8" |
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7/16"-1/2" |
1-7/16" |
1-1/4" |
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9/16"-3/4" |
1-3/8" |
1-7/32" |
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Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
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30-20GA |
1" |
13/16" |
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19-16GA |
1-1/4" |
1" |
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15-12GA |
1-1/2" |
1-1/4" |
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11GA-1/4" |
1-1/2" |
1-1/4" |
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5/16"-3/8" |
1" |
13/16" |
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Aluminum & Copper |
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.012"-.032" |
11/16" |
9/16" |
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.033"-.063" |
7/8" |
23/32" |
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.064"-.125" |
1-1/8" |
15/16" |
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.126"-.500" |
7/8" |
13/16" |
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.501"-.750" |
15/16" |
7/8" |
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Over
72"- 84" Width |
|
H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
|
28-20GA |
|
|
|
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19-16GA |
|
|
|
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15-12GA |
|
|
|
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11GA-1/4" |
1-1/2" |
1-1/4" |
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5/16"-3/8" |
1-1/4" |
1" |
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7/16"-1/2" |
7/8" |
23/32" |
|
|
9/16"-3/4" |
3/4" |
5/8" |
|
|
Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
|
To
1/4" |
2-1/2" |
2-1/8" |
|
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1/4"-3/8" |
2-1/4" |
1-15/16" |
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7/16"-1/2" |
1-5/8" |
1-7/16" |
|
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9/16"-3/4" |
1-1/2" |
1-5/16" |
|
|
Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
|
30-20GA |
|
|
|
|
19-16GA |
|
|
|
|
15-12GA |
|
|
|
|
11GA-1/4" |
1-3/4" |
1-7/16" |
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5/16"-3/8" |
1-3/8" |
1-1/8" |
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Aluminum & Copper |
|
.012"-.032" |
|
|
|
|
.033"-.063" |
|
|
|
|
.064"-.125" |
|
|
|
|
.126"-.500" |
1" |
7/8" |
|
|
.501"-.750" |
1-1/16" |
1" |
|
|
Over
84"-120" Width |
|
H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
|
28-20GA |
|
|
|
|
19-16GA |
|
|
|
|
15-12GA |
|
|
|
|
11GA-1/4" |
1-5/8" |
1-3/8" |
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5/16"-3/8" |
1-1/2" |
1-1/4" |
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7/16"-1/2" |
1-1/8" |
7/8" |
|
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9/16"-3/4" |
1" |
3/4" |
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|
Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
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To
1/4" |
2-5/8" |
2-3/8" |
|
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1/4"-3/8" |
2-1/2" |
1-1/4" |
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7/16"-1/2" |
2-1/8" |
1-7/8" |
|
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9/16"-3/4" |
2" |
1-3/4" |
|
|
Stainless Steel and Other Heat Resistant Alloys
Sheet & Plate |
|
30-20GA |
|
|
|
|
19-16GA |
|
|
|
|
15-12GA |
|
|
|
|
11GA-1/4" |
2" |
1-3/4" |
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5/16"-3/8" |
1-5/8" |
1-3/8" |
|
|
Aluminum & Copper |
|
.012"-.032" |
|
|
|
|
.033"-.063" |
|
|
|
|
.064"-.125" |
|
|
|
|
.126"-.500" |
1-1/8" |
1" |
|
|
.501"-.750" |
1-1/4" |
1-1/2" |
|
|
Over
120" Wide |
|
H.R. & C.R. Steel Sheet, Plate & Hot Dipped
Galvanized Sheets |
|
Thickness Range |
Tolerance |
|
Commercial Quality |
Superior Quality |
Special Quality |
|
28-20GA |
|
|
|
|
19-16GA |
|
|
|
|
15-12GA |
|
|
|
|
11GA-1/4" |
2-1/8" |
1-7/8" |
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5/16"-3/8" |
2" |
1-5/8" |
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7/16"-1/2" |
1-7/8" |
1-1/4" |
|
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9/16"-3/4" |
1-1/2" |
1-1/8" |
|
|
Heat Treated Steel Plate (Hardness Range 185-360
Brinell) |
|
To
1/4" |
3-1/8" |
2-7/8" |
|
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1/4"-3/8" |
3" |
2-5/8" |
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7/16"-1/2" |
2-7/8" |
2-1/4" |
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9/16"-3/4" |
2-1/2" |
2-1/8" |
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