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Standard Stainless Steel and Stainless Grating
SWD: Plus 1/2" minus 0" per foot of width
LWD: Plus 1/2" - 0"
Flattened Stainless Steel
SWD: Plus 1/2" minus 0" per foot of width
LWD: Plus 3/4" - 0"
2.80# Flattened Carbon Steel Grating
SWD: Plus 3/8" minus 0" per foot of width
LWD: Plus 3" - 0"
CAMBER
Bow in sheet. Measured by placing a straight edge along the concave side of the sheet parallel to LWD, touching both ends of the sheet. The maximum distance between the edge of the expanded metal and the straight edge is the camber.
TOLERANCE
Standard expanded metal 1/16" per foot of length
Flattened expanded metal 3/32" per foot of length
OUT OF SQUARE
Expanded metal sheets are not perfectly square as manufactued. Stock size sheets and machine run non-standard size sheets will be produced to the following tolerances.
TOLERANCE
SWD: 1/16" per foot of width
LWD: 1/16" per foot of length
Sheet must be re-squared by shearing on all sides for squareness.
NON-STANDARD SIZES
MACHINE RUN
When tolerances permit, Niles can machine run non-standard sheet sizes to the same tolerances as stock size sheets. Unless otherwise specified, the material will be produced to a plus (+) tolerance; however the material can be produced to a minus (-) tolerance if requested.
RANDOM SHEARING
Stock size sheets and special sizes should be random sheared when a closer tolerance is desired. Normal mill tolerance for standard and flattened expanded metal is plus (+) or minus (-) 1/16"; for our grating products, plus (+) or minus (-) 1/8". Material that is random sheared leaves open diamonds in most cases.
BOND SHEARING
When certain applications require closed diamonds and the quantities do not economically justify special mill runs, bond shearing can sometimes be performed, WITHIN LIMITATIONS, resulting in closed diamond edges. Because of the diamond design and angle, standard expanded metal should not be bond sheared SWD and must be machine run to size. |
