The Process

Design Guidelines

STANDARD PROFILE TOLERANCES

HOT EXTRUDED AND STRAIGHTENED – HOLLOW SECTION

A. EXTERNAL DIAMETER D

B. EXTERNAL DIAMETER D

C. DISPLACEMENT OF INTERNAL FORM X: ± 1 MM

  • Up to 50 mm: ± 0.5 mm
  • Over 50 mm: ± 1%
  • Thickness S: ± 10%
  • (of the nominal thickness)
  • Up to 50 mm: ± 0.5 mm
  • Over 50 mm: ± 1%
  • Thickness: ± 15%
  • Thickness of fin e: ± 0.5 mm
  • Width of fin b: ± 2 mm (or less on agreement)

The tolerances of other hollow profile
shapes must be agreed after study.
For all other tolerances see table for solid
section profiles.

STANDARD PROFILE TOLERANCES

HOT EXTRUDED AND STRAIGHTENED – SOLID SECTION

A.DIMENSIONAL TOLERANCES OF THE TRANSVERSE SECTION:

B.MINIMUM RADII:

C. ANGULAR TOLERANCES:

  • Less than 25 mm ± 0.5 mm
  • from 25 to 75 mm ± 0.8 mm
  • from 75 to 100 mm ± 1.0 mm
  • from 100 to 125 mm ± 1.2 mm
  • over 125 mm ± 1.4 mm

Ri = internal radius: minimum 4 mm
Re = external radius: minimum 1.5 ± 0.5 mm

Type 1 case ± 1°30’ Type 2 case ± 0°30’

D.TRANSVERSE CURVATURE:

E.LONGITUDINAL CURVATURE:

F. WARP:

  • X max = 1% of M
  • (or less on agreement)
  • X max. = 0,15% of L

Max. deviation of 1mm per
metre, or less (on agreement)
according to requirements.

G.DIMENSIONAL DIFFERENCES BETWEEN SYMMETRICAL PARTS:

H.DIMENSIONAL DIFFERENCES BETWEEN SYMMETRICAL PARTS:

I. LONGITUDINAL BAR TOLERANCES:

Max difference between S and S’
half tolerance of point A
e.g. S = S’ = 28± 0.8 mm
max difference 0.8 mm
(hypothesis S = 27.6 S’ = 28.4)

  • Max variation:half tolerance at point A
  • e.g.: nominal values
    M = M’ = 80 ± 1 mm
    A = A’ = 40 ± 0.8 mm
    S = S’ = 15 ± 0.5 mm
  • Example:
    M = 79.5 M’ = 80.5
    A = 39.4 A’ = 40.2
    S = 14.75 S’ = 15.75
  • a) from production ± 1 metre
  • b) fixed: ± 2 mm; from 0+10mm (or on request)
  • c) multiple: + 5 mm each multiple (or on request)
  • d) commercial: from 3 metres to 7 metres

Learn more about custom extruded steel profiles.

Color Scheme

Layout:

WIDE   BOXED

Background Pattern