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STAINLESS STEEL 303

stainlesssteel303

 

Stainless Steel 303 represents superior machinability over all other austenitic stainless steels due to the addition of sulphur in the material.

The sulphur however, does reduce the material’s resistance to corrosion as well as causing poor weldability results.

 

The uses of grade 303 are as follows:

  • Nuts & bolts
  • Bushings
  • Shafts
  • Aircraft fittings
  • Electrical switchgear components
  • Gears

Stainless Steel 303 is available from us in bars and Hexagons in the following sizes…

Bar: from 3mm dia – 7” dia

 

Hexagon: from .3125” dia – 2.500” dia

 

 

Chemical & Physical Properties 

 

Typical Chemical Composition

ElementsMin %Max %
C0.1
Cr17.019.0
FeRemainder
Mn1.52.0
Mo0.6
Ni9.010.0
P0.04
S0.30.35
Si0.75

 

Typical Mechanical Properties

ElementsMin %Max %
C0.1
Cr17.019.0
FeRemainder
Mn1.52.0
Mo0.6
Ni9.010.0
P0.04
S0.30.35
Si0.75

 

 

Tolerances

 

Tolerances on diameter, for general purposes.

Round Bar:

Between 10mm and 15mm   = +/- 0.4mm

Between 16mm and 25mm   = +/- 0.5mm

Between 26mm and 35mm   = +/- 0.6mm

Between 36mm and 50mm   = +/- 0.8mm

Between 52mm and 80mm   = +/- 1.0mm

Between 85mm and 100mm  = +/- 1.3mm

Between 105mm and 120mm = +/- 1.5mm

Between 125mm and 160mm = +/- 2.0mm

Between 165mm and 200mm = +/- 2.5mm

 

220mm= +/- 3.0mm

250mm= +/- 4.0mm

 

Tolerances on diameter, for precision purposes.

 

Round bar:

Between 10mm and 12mm= +/- 0.15mm

Between 13mm and 22mm= +/- 0.20mm

Between 24mm and 30mm= +/- 0.25mm

Between 32mm and 40mm= +/- 0.30mm

Between 42mm and 52mm= +/- 0.40mm

Between 55mm and 75mm= +/- 0.50mm

 

 

Tolerances on hexagons:

 

Width across flats:

Between 13mm and 15mm     = +/- 0.4mm

Between 16mm and 23.5mm   = +/- 0.5mm

Between 25.5mm and 33.5mm = +/- 0.6mm

Between 35.5mm and 47.5mm = +/- 0.8mm

Between 52mm and 78mm     = +/- 1.0mm

Between 83mm and 98mm     = +/- 1.3mm

103mm                     = +/- 1.5mm

Corner Radius:

Below 20.0mm= up to a 1.5mm radius.

Over 20.0mm to 28.5mm= up to 2.0mm radius.

Over 28.5mm to 48.0mm= up to 2.5mm radius

Over 48.0mm to 83.0mm = up to 3mm radius

Over 83.0mm to 103.0mm= up to 3.5mm radius

 

 

Straightness:

Below 39.5mm= not fixed tolerance in the plane.

 

Between 39.5mm and 83.0mm= q up to 0.004 x L tolerance in the plane.

 

Between 83.0mm and 103.0mm= q up to 0.0025 x L tolerance in the plane.

 

303 STOCK

 

 

 


 

 

 

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