Stainless Steel 316
from P&P Non Ferrous Ltd



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           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
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.
Tolerances on squares:
Size:
Between 8mm and 14mm= +/- 0.4mm
Between 15mm and 25mm= +/- 0.5mm
Between 26mm and 35mm= +/- 0.6mm
Between 40mm and 50mm= +/- 0.8mm
100mm= +/- 1.3mm
Between 110mm and 120mm= +/- 1.5mm
Between 130mm and 150mm= +/- 1.8mm
Corner radius:
Over 8mm to 12mm= up to 1mm
Over 12mm to 20mm= up to 1.5mm
Over 20mm to 30mm= up to 2mm
Over 30mm to 50mm= up to 2.5mm
Over 50mm to 100mm= up to 3mm
Over 100mm to 150mm= up to 4mm
Straightness (q):
Below 25mm= a not fixed tolerance in the plane
Between 25mm and 80mm= q up to 0.4% of L tolerance in the plane
Over 80mm= q up to 0.25% of L tolerance in the plane
Twist:
Over 8mm up to 14mm= 4 degrees/metre, max of 24 degrees
Over 14mm up to 50mm= 3 degrees/metre, max of 18 degrees
Over 50mm= 3 degrees/metre, max of 15 degrees
Out-of-squareness:
Up to 50mm= 1.5mm
Over 50mm up to 75mm= 2.25mm
Over 75mm up to 100mm= 3.00mm
Over 100mm up to 150mm= 4.50mm
Tolerances on flat bar:
Width:
Between 10mm and 40mm= +/- 0.75mm
Over 40mm up to 80mm= +/- 1.0mm
Over 80mm up to 100mm= +/- 1.5mm
Over 100mm up to 120mm= +/- 2mm
Over 120mm up to 150mm= +/- 2.5mm
Thickness:
Up to 20mm= +/- 0.5mm
Over 20mm up to 40mm= +/- 1.0mm
Over 40mm up to 80mm= +/- 1.5mm
Straightness:
Below 1000mm2= a tolerance in the plane of below 0.4% of measuring length.
1000mm2 and above= a tolerance in the plane below 0.25% of measuring length.
Out-of-section:
Between 10mm and 25mm= 0.5mm
Over 25mm up to 40mm= 1mm
Over 40mm up to 80mm= 1.5mm



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