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Tolerance on size: Nominal outside dimension (inches)
Outside tolerance for all sides at corners (inches)
1¾" x 1¾"  ± 0,008
2" x 2"    ± 0,008
2¼" x 2¼"   ± 0,010
2½" x 2½"   ± 0,01
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Squareness of sides and twists: Nominal outside dimension (inches)
Squareness tolerance (inch*)
Twist permissible in 3 feet (inch**)
1¾" x 1¾"   ± 0,010   0.062
2" x 2"   ± 0,012   0.062
2¼" x 2¼"   ± 0,014   0.062
2½" x 2½"   ± 0,015   0.075
* Tubing may have its sides failing to be 90° to each other by tolerance listed.
**Twist is measured by holding down the edge of one end of a square tube on a surface plate with the bottom side of the tube parallel to the surface plate and noting height that either corner on the opposite end of the bottom side is above the surface plate.
Convexity and concavity: Measured in the center of the flat side, tolerance is ±0,010 inch applied to the specific size determined at the corner.