Long Series 5230T.
Used for milling keyways and slots. Bright finish. Flute type: 30° helix. Manufactured to BS 122: Part 4: 1980.
Inch Tolerances:
Diameter: up to 1/2". Tolerance: +0.0005, -0.0013.
Diameter: Over 1/2". Tolerance: +0.0005, -0.0015.
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