Stainless Steel Square Tubing

Stainless steel square tubing is widely used for architectural ornament, metalwork, machine building, furniture and sanity tools, stainless steel grades have 201, 304, 304L, 316L, 321, we offer square tubing with large range of sizes and dimensions。

Stainless Steel Square Tubing
stainless steel square tubing

Stainless Steel Square Tubing Specifications

TypeWelded Tube
FormSquare Tubing
StandardASTM A554
Grades201, 304, 304l, 316L, 321
OD1/2“ X 1/2″ – 12″ X 12″
Thickness0.035″ – 0.12″
SurfaceAnnealed Pickling, Polishing, Brushed
ApplicationDecorative, Ornamental Purpose

ASTM A554 Square Tubing

ASTM A554 specification is a common standard for welded stainless steel mechanical tubing, beside square shape tubing, and round tubing, rectangular tubing and special forms tubes。 All tubes are produced strict as A554, no addition metal added。

Both as welded and annealed condition are available, square mechanical tubing should be cold worked, usually, stainless steel square tubing is polished in various grits to achieve bright surface, there are mill finishes and polished finishes for square tubing, polishing tubing finishes include 180 Grit (#4 polish), 240 Grit, 320 Grit and a #8 mirror finish.

Square Tubing Dimensional Tolerances

SS square tubing dimensional tolerances are listed as follow, it is also requirement of rectangular tubing tolerance。

Outside Diameter Tolerances

Outside Diameter (In/mm)OD Tolerance (In/mm)
To 1 1⁄4 (31.8), Incl0.015 (0.38)
Over 1 1⁄4 To 2 1⁄2 (31.8 To 63.5), Incl0.020 (0.51)
Over 2 1⁄2 To 5 1⁄2 (63.5 To 139.7), Incl0.030 (0.76)
Over 5 1⁄2 To 8 (139.7 To 203.2), Incl0.060 (1.52)

Wall thicknes Tolerances

± 10 % of specified wall thickness

Maximum Radii of Corners

Wall Thickness, in. (mm)Radii of Corners,
max, in. (mm)
Over 0.020 to 0.049 (0.51 to 1.24), incl3⁄32 (2.4)
Over 0.049 to 0.065 (1.24 to 1.65), incl1⁄8 (3.2)
Over 0.065 to 0.083 (1.65 to 2.11), incl9⁄64 (3.6)
Over 0.083 to 0.095 (2.11 to 2.42), incl3⁄16 (4.8)
Over 0.095 to 0.109 (2.42 to 2.77), incl13⁄64 (5.2)
Over 0.109 to 0.134 (2.77 to 3.40), incl7⁄32 (5.6)
Over 0.134 to 0.156 (3.40 to 3.96), incl1⁄4 (6.4)
Over 0.156 to 0.200 (3.96 to 5.08), incl3⁄8 (9.5)
Over 0.200 to 0.250 (5.08 to 6.35), incl1⁄2 (12.7)
Over 0.250 to 0.375 (6.35 to 9.53), incl3⁄4 (19.1)

TIG Welding Square Tubing

We use automatic TIG welding method to produce square tubing, quality weld seam can be finished due to advantages of TIG welding, learn more about TIG welding tubing.

Stainless Steel Grades

There is a variety of 澳门凯发娱乐stainless steel grades to select, 201 and 304 grades are most used material for square tubing, stainless steel exhibits excellent mechanical properties and corrosion resistance to meet many requirements of application, and multiple finishes can be achieved for different purposes.

ASTM A554 specified stainless steel grade with prefix MT, like MT201, MT304, MT316, MT316L.

Available Sizes

We offer stainless steel square tubing in various outside diameter, wall thickness and length, small diameter and large diameter sizes of square tubes are available, the smallest diameter is 4 mm, the wall thickness can be conforming to BWG gauge, checking standard sizes chart below..

Square tubing weight calculation can be obtained as formula in kg or meter

Value Added Services

  • Bending
  • Hole punching
  • Polishing
  • Cutting


The typical application for square tubing is for handrail use with fittings, polished or non polished for ornamental purpose.

Stainless Steel Square Tubing Sizes Chart

size(mm) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2 1.5 2.0 2.5 3.0 4.0