Corus Structural Sections - Engineering Surveyor

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Structural Sections to BS4: Part 1: 1993 and BS EN10056: 1999 Rolling tolerances – BS EN 10056-2: 1993 This European Standard specifies tolerances on shape Out-of-square (k) Out-of-squareness of the section shall not exceed the maximum given in Table 1(c). For unequal leg Deviation k k Deviation dimensions and mass of hot-rolled structural steel angles, the longer leg length (a) equal and unequal leg angles. shall be used to determine the tolerance band. Tolerances on shapes and dimensions Leg length (a or b) The deviation from nominal on leg length shall be within the tolerance given in Table 1(a). For unequal leg angles the longer leg length (a) shall be used to determine the tolerance band. y t Table 1 (c) Squareness tolerances Out of square - leg length mm Up to and including 100 Greater than 100 up to and including 150 Greater than 150 up to and including 200 Greater than 200 Tolerance mm 1.0 1.5 2.0 3.0 a Straightness (q) x x The deviation from straightness t shall not exceed the tolerances given in Table 1(d). For unequal leg y b angles, the longer leg length (a) shall be used to determine the q tolerance band. L Table 1 (a) Dimensional tolerances Table 1 (d) Straightness tolerances Leg length a mm Up to and including 50 Greater than 50 up to and including 100 Greater than 100 up to and including 150 Greater than 150 up to and including 200 Greater than 200 Tolerance mm ± 1.0 ± 2.0 ± 3.0 ± 4.0 + 6.0 -4.0 Leg length a mm Up to and including 150 Up to and including 200 Greater than 200 Over full bar length Deviation q mm 0.4% L 0.2% L 0.1% L Tolerance Over any part bar length Length considered mm 1,500 2,000 3,000 Deviation q mm 6.0 3.0 3.0 Section thickness (t) The deviation from nominal on thickness shall be within the tolerances given in Table 1(b). Table 1 (b) Thickness tolerances Section thickness t mm Up to and including 5 Greater than 5 up to and including 10 Tolerance mm ± 0.50 ± 0.75 Tolerance on mass The deviation from the nominal mass of any individual piece shall not exceed: a) ± 6% for thickness for t < 4mm or \ b) ± 4% for thickness for t > 4mm. The deviation from the nominal mass is the difference between the actual mass of the piece and the calculated mass. The calculated mass shall be determined using a density of 7850kg/m 3 . Greater than 10 up to and including 15 Greater than 15 ± 1.0 ± 1.20 Tolerance on length The tolerance on ordered length shall be either: a) ± 50mm; or b) -0, +100mm where minimum lengths are required. 40 Corus Construction & Industrial
Structural Sections to BS4: Part 1: 1993 and BS EN10056: 1999 Joists to BS 4: Part 1: 1993 Mass tolerances for joists Tolerances shall be applied to the actual mass per unit length of the joist. The rolling tolerances shall either be: a) ± 2.5% of the actual mass per unit length or b) + 5.0% of the actual mass per unit length where a minimum mass per unit length is ordered. Length tolerances for joists Joists ordered as “specified” or as “exact” lengths shall be supplied as follows: a) Specified lengths. When a joist is cut to a specified length, it shall be cut to within ± 25mm of that length. When a minimum length is specified, it shall be cut to within +50 -0 mm of that minimum length. b) Exact lengths. When a section is to be cut to an exact length, it shall be cold sawn to within ± 3.2mm of that length. Depth tolerances for joists Nominal depth Maximum permissible variation from specified depth mm mm Table 1: Tolerances for parallel flange channels Designation Property Range Tolerance mm mm mm HEIGHT h 65 ±1.5 h FLANGE WIDTH b b h s WEB THICKNESS s t r 3 FLANGE THICKNESS b— 2 t HEEL RADIUS k k k k 1 1 r3 OUT OF SQUARENESS k + k1 WEB FLATNESS f v/ 65
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Corus Structural Sections - Engineering Surveyor

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