Machining Allowance
Hot Rolled Bars
Alloy or special quality carbon steel bars, hot rolled 1.6% of diameter per side.
Cold Drawn Bars
.001" per .062" (1.6%) of diameter per side, including leaded steels.
.0015" per .062" (2.4%) of diameter per side, for free machining grades, except leaded steels.
Cold Drawn, Ground and Polished Bars
.0005" per .062" (0.8%) of diameter per side, including leaded steels.
.00075" per .062" (1.2%) of diameter per side, for free machining grades, except leaded steels.
Turned Bars
This product requires finish machining to clean up the turning marks according to the following table:
Bar Size (Inches) |
Minimum Removal Per Side (Inch) |
Minimum Removal Per Diameter (Inch) |
||
5/8 | to 2 | incl. | .010 | .020 |
Over 2 | to 3 | incl. | .013 | .026 |
Over 3 | to 3 ½ | incl. | .015 | .030 |
Over 3 ½ | to 4 | incl. | .018 | .036 |
Over 4 | to 4 ½ | incl. | .021 | .042 |
Over 4 ½ | to 5 | incl. | .024 | .048 |
Over 5 | to 6 | incl. | .027 | .054 |
Over 6 | to 7 | incl. | .030 | .060 |
Over 7 | to 8 | incl. | .033 | .066 |
Turned and Polished Turned, Ground and Polished Bars
Bars ordered to these conditions are generally free of decarburization and surface imperfections. If total freedom from decarburization is required, it must be specified.
Turned, Ground and Polished Bars may be used in the as received condition.
Recommended stock removal for aircraft quality alloys subject to magnetic particle inspection
Hot Rolled Bars
Specified Size (inches) | Min. stock removal from surface (inches) |
Up to 1/2, incl | 0.030 |
Over 1/2 to 3/4, incl | 0.045 |
Over 3/4 to 1, incl | 0.060 |
Over 1 to 1 ½, incl | 0.075 |
Over 1 ½ to 2, incl | 0.090 |
Specified Size (inches) | Min. stock removal from surface (inches) |
Over 2 to 2 ½, incl | 0.125 |
Over 2 ½ to 3 ½, incl | 0.156 |
Over 3½ to 4 ½, incl | 0.187 |
Over 4 ½ to 6, incl | 0.250 |
Over 6 to 7 ½, incl | 0.312 |