HOT FINISHED

Hot finished mechanical tubing is produced by rotary piercing, plug, or Assel mill rolling, and final processing through multiplepass sizing-reducing mills. Tolerances and finish are similar to other hot worked steel products. Range of sizes and grades is more restricted than cold finished by the nature of the process involved. This tubing is used where dimensional accuracy and surface finish are unimportant or secondary, or where desired tolerances, finish, and final mechanical properties are to be attained by machining and heat treatment.

OUTSIDE DIAMETER TOLERANCES
for Round Hot-Finished Tubinga,b,c per ASTM A519

Outside Diameter
Size Range
Inch (mm)
Outside Diameter ToleranceInch (mm)
Over
Under
Up to 2.999 (76.17)
0.020 (0.51)
0.020 (0.51)
3.000-4.499 (76.20-114.27)
0.025 (0.64)
0.025 (0.64)
4.500-5.999 (114.30-152.37)
0.031 (0.79)
0.031 (0.79)
6.000-7.499 (152.40-190.47)
0.037 (0.94)
0.037 (0.94)
7.500-8.999 (190.50-228.57)
0.045 (1.14)
0.045 (1.14)
9.000-10.750 (228.60-273.05)
0.050 (1.27)
0.050 (1.27)
10.750 and larger
1%
1%
a
Diameter tolerances are not applicable to normalized and tempered or quenched and tempered conditions.
b
The common range sizes of hot finished tubes is 1-1/2 inch (38.1 mm) to 10-1/4 inch (273.0 mm) outside diameter with wall thickness at least 3 percent or more of outside diameter, but not less than 0.095 inch (2.41 mm).
c
Larger sizes are available: consult manufacturer for sizes and tolerances.

WALL THICKNESS TOLERANCES
for Round Hot-Finished Tubinga per ASTM A519

Wall Thickness Tolerance, a
Percent Over and Under Nominal
Wall Thickness Range,
As Percent of Outside Diameter
Outside Diameter
Size  Range In. (mm)
Under 15
15 and Over
Up to 2.999 (76.19)
12.5
10.0
3.000-5.999 (76.20-152.37)
10.0
 7.5
6.000-10.750 (152.40-273.05)
10.0
10.0
10.750 and larger
±12-1/2%
±12-1/2%
a
Wall thickness tolerances may not be applicable to walls 0.199 inch (5.05 mm) and less: consult manufacturer for wall tolerances on such tube sizes.