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Stainless Steel 303 Hex Bar

Stainless steel 303 hex bar specifications

What is a Stainless Steel 303 Hex Bar / Square Bar?

This corrosion-resistant material uses 18-20% chromium and up to 10.5% nickel. A stainless steel 303 hex bar is sturdy and versatile. Manufacturers can produce these austenitic products in customer-specified sizes, although 1/8 to 12 inches (diameter) is standard.

Notably, while a UNS S30300 square bar can withstand mild corrosive attacks, it is unsuitable for marine applications.

These products can undergo solution treatment or annealing. An SS 303 hexagonal bar is available in various surface finishes, like turned, polished, and cold-drawn.

Stainless steel 303 square bar supplier in India


Specification of stainless steel 303 hex bar

Specifications Size Heat treatment
ASTM / ASME SA A276, A479, ASTM A493 20mm to 150mm Solution treatment, annealing, cold drawn
Condition Length Surface finish
Cold drawn, turned & polished, centreless ground Random, fix & cut length 2B, NO.3, 1D, NO.4, 8K, 2D, BA, NO.1, HL
Processing service Tolerance DIN 1.4305 hex bars American standards of SS 303 hexagonal bar
Bending, cutting, welding, decoiling, punching ±5% AISI, ASTM ,JIS, EN, DIN, GB

We are a specialized manufacturer of UNS S30300 square bars, view their properties and sizes

What are the characteristics of a Stainless Steel 303 hex bar?

A property that sets apart a stainless steel 303 square bar is brilliant machinability. The presence of sulphur makes this material easy to form, grind, and mould.

  • These components have good mechanical strength, with a tensile rating of 500 to 750 MPa
  • These bars handle temperatures up to 760°C (intermittent) and 870°C (continuous). However, we don’t recommend such usage due to the risk of carbide precipitation over 425°C. It can also experience pitting and crevice corrosion at high temperatures in chloride-rich environments.
  • Not cold workable or hardenable by heat treatment
  • The Brinell hardness stands at 230 HB.

While sulphur benefits UNS S30300 303 hex bars in the ease of machining, it adversely impacts toughness, corrosion resistance, and weldability. Consequently, Werkstoff Nr 1.4305 hexagonal bars have lower resilience than 304 or 316 grades.

Types of stainless steel 303 bar


Stainless Steel 303 hexagon bar

Stainless Steel 303 hexagon bar

SS 303 square bar

SS 303 square bar

SS 303 hex bar

SS 303 hex bar

SS 303 rectangular bars

SS 303 rectangular bars

Our company specializes in making ASTM A276 Type 303 ss square bar that offer exceptional mechanical strength and various surface finishes

What are the common applications for a Stainless Steel 303 hex bar?

DIN 1.4305 hexagon bars operate in core industries like machinery, aerospace, chemical processing, and architecture. They also work in food and beverages and capably handle cryogenic roles due to dependable temperature tolerance.

The essential uses of an ASTM A276 Type 303 SS square bar pertain to applications demanding high machinability, like automated machining, shafts, aircraft components, valves, and fasteners like bolts.

Other industries using an ASME SA479 grade 303 hex bar include waste disposal and air pollution control.

Chemical composition of SS 303 square bar


C Mn Si P S Cr Ni
0.08 max
2 max
0.75 Max
0.045 max
0.030 max
18 - 20
8 - 11
Shop from our large selection of ASME SA479 grade 303 hex bar at very low cost

Mechanical properties of SS 303 hexagon bar


Grade Density Melting points Tensile strength Yield strength(0.2% offset) Elongation
SS 8.0g/ cm3 1400°C (255°F) PSI-75000, MPa-515 PSi-30000, MPa-205 35%
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Equivalent grade of 303 SS rectangular bars


Standard Werkstoff nr. UNS JIS BS GOST AFNOR EN
SS 1.4301 S30400 SUS 304 304S31 08X18H10 Z7CN18-09 X5CrNi18-10

Sizes of ASTM A276 Type 303 ss square bar


15/16" 1 1/6" 1 3/16" 1 5/16" 1 1/8" 1 7 16" 1 1/4" 1 3/8"
2" 2/12" 3" 4" 2 3/4"   3 1/2"  
1 1/2" 1 9/16" 1 1/16" 1 13/16" 1 5/8" 1 15/16" 1 3/4" 1 7/8"
3/4" 7/16" 5/8" 3/4" 1/2" 7/8" 11/16" 13/16"

Tolerance of UNS S30300 303 hex bars


Tolerance Size
  0/-.111mm > 10 - ≤ 18mm
  0/-.090mm > 6 - ≤ 10mm
  0/-.130mm > 18 - ≤ 30mm
  0/-.190mm > 50 - ≤ 80mm
  0/-.075mm > 3 - ≤ 6mm
  0/-.160mm > 30 - ≤ 50mm

Weight chart of stainless steel 303 hex bar


Stainless steel 303 hex bar
Size(mm) 16 18 20 22 25 28 30 32
wt/mtr (kg) 1.79 2.27 2.80 3.39 4.38 5.49 6.30 7.17
wt/ fit (kg) 0.55 0.69 0.85 1.03 1.33 1.67 1.92 2.19
Size(mm) 36 38 40 45 50 28 56 60
wt/mtr (kg) 9.07 10.11 11.20 14.18 17.50 5.49 - -
wt/ fit (kg) 2.77 3.08 3.41 4.32 1.33 5.34 - -

Characteristics of UNS S30300 square bar


  • Good cold working of stainless steel hex bars
  • Good heat resistance
  • Excellent SS hex rod corrosion resistance
  • Fair hex rod hot working
  • Poor heat treatment of hex bars
  • Very good hex bars weldability
  • Good machinability