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Tolerances – Straightness

Hot Rolled Steel BarsRounds, Squares, Hexagons, Octagons,Flats and Spring Flats
Measurement is Taken on the Concave
Side of the Bar with a Straight Edge
Normal Straightness* Special Straightness**
1/4 in. (6.35 mm) in any 1/8 in. (3.18 mm) in any
5 ft. (1524 mm) or 0.4 5 ft. (1524 mm) or 0.2
per cent of length for lengths over 5 ft per cent of length for lengths over 5 ft
(1524 mm) (1524 mm)

*Because of distortion, normal straightness tolerances do not apply if any subsequent heating operation has been performed.

**Because of distortion, special straightness tolerances do not apply if any subsequent heating operation except stress relieving has been performed after special straightening. Increased surface hardness is normal to the operation.

Note: Tolerances shown are based upon ASTM A29.Reference: AISI Steel Products Manual, Alloy, Carbon and HSLA Steels. March, 1986.