Mechanical Tubing Tolerances

Timken Tubing Tolerances	Hot Rolled, Round¹	Cold Drawn, Round²	Rotorolled, Round	Rough Turned,Round
As Hot Rolled/Rough Turned or Single Thermal Treatment; As Cold Drawn or Tempered; As Rotorolled^®	inches T_OD = ± (.0045 OD + .005) or ± .015 min. mm T_OD = ± (.0045 OD + .13) or ± .38 min. Over 11.0 inches (279mm) to 12.0 inches (305mm) inches T_OD = ± 0.075 mm T_OD = ± 1.91 > 12.0 inches (305mm) - refer to mill	inches T_OD/ID = ± (.0023 OD - .003) or ± .004 min. mm T_OD = ± (.0023 OD - .08) or ± .10 min.	inches T_OD/ID = ±( .0024 OD + .0016) or ± .005 min. OD ± .010 min. ID mm T_OD/ID = ± (.0024 OD + .041) or ± .13 min.	Under 6.75 inches (171.5 mm) inches T_OD = ± .005 mm T_OD = ± .13 6.75 inches (171.5 mm) and over inches T_OD = ± .010 mm T_OD = ± .25
Cold Drawn and Annealed; Rotorolled and Tempered		inches T_OD/ID = ± 1.8 (.0023 OD - .003) or ± .007 min. mm T_OD = ± 1.8 (.0023 OD - .08) or ± .18 min.	inches T_OD/ID = ± (.0024 OD +.007) or ± .010 min. mm T_OD = ± (.0024 OD + .18) or ± .25 min.
Quenched and Tempered or Normalized and Tempered (OD & Wall or ID & Wall Dimensions only)	inches T_OD = ± 1.5 (.0045 OD + .005) or ± .023 min. mm T_OD = ± 1.5 (.0045 OD + .13) or ± .58 min. 11.0 inches (279 mm) and over inches T_OD = ± .113 mm T_OD = ± 2.87	inches T_OD/ID = ± 2.5 (.0023 OD - .003) or ± .010 min. mm T_OD/ID = ± 2.5 (.0023 OD - .08) or ± .25 min.	inches T_OD/ID = ± 2 (.0024 OD + .0016) or ± .010 min. mm T_OD/ID = ± 2 (.0024 OD + .041) or ± .25 min.	Under 6.75 inches (171.5 mm) inches Inquiry Basis mm Inquiry Basis 6.75 inches (171.5 mm) and over inches Inquiry Basis mm Inquiry Basis
Quenched and Tempered or Normalized and Tempered (OD & ID Dimensions only)		inches T_OD/ID = ± 3.75 (.0023 OD - .003) or ± .015 min. mm T_OD/ID = ± 3.75 (.0023 OD - .08) or ± .38 min.	inches T_OD/ID = ± 3 (.0024 OD + .0016) or ± .015 min. mm T_OD/ID = ± 3 (.0024 OD + .041) or ± .38 min.
Wall Tolerances All Thermal Conditions	OD to wall ratio over 10:1± 10% OD to wall ratio of 10:1 or less± 7.5% Minimum wall tolerance is ± .020 inch (.51 mm).	OD to wall ratio over 10:1± 7.5% OD to wall ratio 10:1 to 4:1± 6% OD to wall ratio under 4:1± 7.5% Minimum wall tolerance is ± .012 inch (.30 mm). When ID is under .625 inch (15.88 mm), inquiry basis. Walls 6% of OD and lighter, inquiry basis. When OD & ID dimensions, use ± 7.5% wall.	All wall thicknesses ± 5% Minimum wall tolerance is ± .012 inch (.30 mm).	OD to wall ratio over 10:1..........± 10% OD to wall ratio of 10:1 or less....± 7.5% Minimum wall tolerance is ± .020 inch (.51 mm).

Special Processed Tubing Tolerances	Cold Drawn, Shaped Square, Rectangular or Oval	Cold Drawn, Shaped Dissimilar OD and ID Configuration³
As Hot Rolled/Rough Turned or Single Thermal Treatment; As Cold Drawn or Tempered; As Rotorolled^®	inches T_OD/ID = ± .005 OD or ± .020 min. mm T_OD = ±.005 OD or ±.51 min.	inches T_OD/ID = ± .005 OD or ± .010 min. mm T_OD = ± .005 OD or ± .25 min.
Quenched and Tempered or Normalized and Tempered (OD & Wall or ID & Wall Dimensions only)	inches T_OD/ID = ± .01 OD ± .040 min. mm T_OD/ID = ± .01 OD ± 1.02 min.	inches T_OD/ID = ± .01 OD ± .020 min. mm T_OD/ID = ± .01 OD ± .51 min.
Wall Tolerances All Thermal Conditions	All wall thicknesses ± 10% at center of flats	All wall thicknesses ± 10% at center of flats

OD - Outside Diameter

ID - Inside Diameter

T - Tolerance

W - Wall Thickness

^{1. Hot rolled and rough turned tubes can be purchased to outside diameter (OD) and wall thickness (W) only.

2. Tubes with a final OD/W ratio less than 4:1 or a nominal finish wall size greater than 1.250 inches (31.75 mm) will have a hot rolled ID and will be produced to cold drawn OD tolerances and hot rolled wall tolerances.

3. When corner radii and twist are important, they must be reviewed by our mill before we accept the order.}

ASTM A-519 tolerances are acceptable except for cold finished sizes smaller than 2.500 inches (63.50 mm) diameter, where Timken Company tolerances apply.

Timken Company guaranteed tube sizes are calculated using Timken Company tolerances.

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