Table A1.4 Straightness Tolerances for Level One Cold Finished Bars(a,b) – ASTM A108
Note: All grades quenched and tempered or normalized and tempered to Brinell 302 max before cold finishing; all grades stress relieved or annealed after cold finishing. Straightness tolerances are not applicable to bars having Brinell hardness exceeding 302
Straightness Tolerances, In. (Maximum Deviation) from Straightness in any 10-ft Portion of the bar
Maximum of Carbon Range,
0.28% or less
Maximum of Carbon Range,
over 0.28% and All
Grades Thermally Treated
Size, in. (a)Length, ft.RoundsSquares, Hexagons
& Octagons
RoundsSquare, Hexagons
& Octagons
Less than 5/8Less than 151/83/163/161/4
Less than 5/815 and over1/85/165/163/8
5/8 and overLess than 151/161/81/83/16
5/8 and over15 and over1/83/163/161/4
(a) The foregoing tolerances are based on the following method of measuring straightness: Departure from straightness is measured by placing the bar on a level table so that the arc or departure from straightness is horizontal, and the depth of the arc is measured with a feeler gage and a straightedge.

(b) It should be recognized that straightness is a perishable quality and may be altered by mishandling. The preservation of straightness in cold finished bars requires the utmost care in subsequent handling. Specific straightness tolerances are sometimes required for carbon and alloy steels in which case the purchaser should inform the manufacturer of the straightness tolerances and the methods to be used in checking the straightness.
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