wholesale telescoping steel sign post tube

Date:2016-12-01 11:29 [ Back ]
 

There are different kinds of galvanized finish, available in dipped galvanized, pre-galvanized, electric-galvanized (cold galvanized), select what you prefer and advise us your requests for better price quotation.

Wall thickness tolerance:

Permissible variation in wall thickness is + 0,011, -0,005 inches.

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

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.

Straightness tolerance:Permissible variation in straightness is 1/16” in 3 feet.

Telescoping: Using 12 gauge or 14 gauge square tube, consecutive size tubes shall be cleaned of galvanization burrs and shall telescope freely for ten feet.

Hole tolerance: Tolerance on hole size is ±1/64” on a 7/16” hole size. Tolerance on hole spacing is ± 1/8” in ten feet.




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