Rebar, bars and extruded profiles. Tolerances at transversal section in millimeters for more or less. These tolerances apply to extruded profiles except for annealing O (baking state) and tempering F (as manufactured).
(A) These standard tolerances apply to common profiles; larger tolerances may be
required for some profiles and narrower tolerances for others may be possible
depending on the prior agreement between the buyer and the supplier.
(B) Tolerances for extruded profiles in special alloys and tempers shall be be agreed between the buyer and the supplier.
(C) The tolerance applicable to a composite dimension of two or more components is the sum of the tolerances of the component dimensions, if all are indicated.
(D) If a specified dimensional tolerance is not symmetric, then the standard
tolerance value to be applied is the one that would be applied to the average of
the maximum and minimum dimensions permissible for the tolerance initially
E) (E) These tolerances do not apply to the "X" and "Z" dimensions of the example,
even when "Y" is 75% or more of "X". For tolerances applicable to dimensions "X" and "Z" use columns 4, 5, 6, 7, 8 and 9 depending on the distance A.
(F) The tolerance in the wall thickness of the tubular or semi-tubular profiles shall be agreed between the buyer and the supplier when the nominal thickness of one wall is three or more times larger than the opposite wall.
(G) At points situated at 5 mm or less from the beginning of the flap, the tolerances for column 2 shall apply.
(H) The following tolerances are applied in the case of tubular profiles:
• for the width (L), the tolerance is given in column 4 for height (H);
• for height (H), the tolerance is given in column 4 for width (L);
• In no case can the tolerance for the width or height be less than the tolerance
for the corners (column 2, dimensions of the metal).
Example of a tubular profile having rectangular outer dimensions of (25 x 75 mm):
• the tolerance at the width is ± 0.46 mm and the tolerance at the corners
(column2), dimensions of the metal) is 0.60 mm for the width and ± 0.25 mm for the height. Note that the tolerance of 0.46 mm in column 4 should be adjusted to 0.60 mm in order not to be less than the tolerance in column 2.
(l) When the specified dimensions are external and internal. Instead of the wall
thickness itself, the permissible deviation (eccentricity) indicated in column 3 applies to the average wall thickness.
(J) In the case of standard tubular profiles, the standard tolerance for the standard thickness, for the wall thickness of the extruded round tubes is applied.
(a) internal void dimensions (tubular profiles): all dimensions indicated by "Y" are
classified as "metal dimensions" within the tolerances given in column 2.
Dimensions indicated by "X" are classified as "dimensions including internal voids" , the applicable tolerances being determined by column 4, unless 75% or more of the size is metal, in which case column 2
(b) dimensions of the voids not totally circumscribed by metal. The tolerances
applicable to dimension "X" can be classified in one of the following three cases:
• Localize the dimension (X) in column 1;
• Determine which column, from 4 to 9, is applicable, depending on the distance (A);
• Localize the correct tolerance between columns 4 and 9, in the same line
as dimension (X);
• localize the distance (B) in column 1;
• determine which column, from 4 to 9, is applicable depending on distance (A);
• localize the correct tolerance between columns 4 and 9, on the same line
as the value chosen in column 1;
• the tolerances applicable to the dimensions (X) are not determined by
the scale but by the standard tolerances applicable to the angles (A).