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 1/2 | incl. | .015 | .030 |
| Over 3 1/2 | to 4 | incl. | .018 | .036 |
| Over 4 | to 4 1/2 | incl. | .021 | .042 |
| Over 4 1/2 | 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 1/2, incl | 0.075 |
| Over 1 1/2 to 2, incl | 0.090 |
| Over 2 to 2 1/2, incl | 0.125 |
| Over 2 1/2 to 3 1/2, incl | 0.156 |
| Over 3 1/2 to 4 1/2, incl | 0.187 |
| Over 4 1/2 to 6, incl | 0.250 |
| Over 6 to 7 1/2, incl | 0.312 |
Supplying the world AISI 4130 (E4130) and 4340 (E4340) Aircraft Quality Steel.
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