STRUCTURAL SQUARE AND RECTANGULAR TUBING
ASTM A-500 GRADES B AND C

ASTM A-500 is a cold formed electric weld product. Advantages include material strength, ability to resist stress from any direction, and ease of connection to other structural shapes.

CHEMICAL COMPOSITION
CHECK ANALYSIS

Max. Percent
ASTM A-500
Grade B
ASTM A-500
Grade C
Carbon
0.30
0.27
Phosphorus
0.045
0.045
Sulphur
0.045
0.045
WORKABILITY AND WELDABILITY

Can be subjected to most of the usual fabricating operations. Its ductility is good, bends well, flattens, cuts, punches, flares, and flanges easily. Can also be welded by commonly employed techniques and practices.

MECHANICAL PROPERTIES

 
ASTM
A-500 Grade B
Grade C
Tensile Strength, min, psi
58,000
62,000
Yield Strength, min, psi
46,000
50,000
Elongation in 2 inch, min, percent
23
21

STRUCTURAL SQUARE AND RECTANGULAR TUBING

MAXIMUM OUTSIDE CORNER RADII
TOLERANCES

10.6 Radius of Corners—For square or rectangular structural tubing, the radius of any outside corner of the section shall not exceed three times the specified wall thickness.

OUTSIDE DIMENSIONS AND WALL THICKNESS
SQUARE AND RECTANGULAR

Largest Outside
Dimension Across
Flats, Inches
Tolerance for Outside
Dimensions Including
Convexity or Concavity
Wall Thickness
Tolerance
1 to 2-1/2 incl.
Plus or minus 0.020″
Plus or minus 10%  Exclusive of weld area
Over 2-1/2 to 3-1/2 incl.
Plus or minus 0.025″
Plus or minus 10%  Exclusive of weld area
Over 3-1/2 to 5-1/2 incl
Plus or minus 0.030″
Plus or minus 10%  Exclusive of weld area
Over 5-1/2
Plus or minus 1%
Plus or minus 10%  Exclusive of weld area

NOTE: The allowable variation in wall thickness does not apply at corners.

 

A500 ROUND OD AND WALL TOLERANCES
1.900″ and smaller OD:
±1/2%

2.000 and larger OD:

±3/4%
WALL THICKNESS
±10%

TOLERANCES

SQUARENESS OF SIDES

Adjacent sides of structural hollows may deviate from 90°
by plus or minus two degrees maximum.
VARIATIONS FROM EXACT STRAIGHTNESS
Permissible Variations, In.
(Includes Camber and Sweep) 1/8″ x 5
Number of Feet of Total Length
5
MAXIMUM TWIST
Longer Outside
Dimensions, Inches
Maximum Twist
Per 3 Feet of Length, Inches
1 to 1-1/2 incl.
0.050
Over 1-1/2 to 2-1/2 incl.
0.062
Over 2-1/2 to 4 incl.
0.075
Over 4 to 6 incl.
0.087
Over 6 to 8 incl.
0.100
Over 8
0.112
Twist is measured by holding down the edge of one end of a square or rectangular structural hollow on a surface plate with the bottom side of the tube parallel to the surface plate and noting the height that either corner on the opposite end of the bottom side is above the surface plate.
PERMISSIBLE VARIATION — MILL LENGTHS
To 22´ incl.
Over 22´ to 44´ incl.
Over
Under
Over
Under
1/2″
1/4″
3/4″
1/4″

Cut lengths of stock material can normally be held within 1/8 in. or closer if desired.