Regular Series Type 5321T.
Bright finish. Flute type: 30° helix. Manufactured to BS 122: Part 4: 1980.
Metric Tolerances:
Diameter: up to 38.00mm. Tolerance: +0.0630, -0.0130.
Diameter: Over 38.00mm. Tolerance: +0.1250, -0.0000.
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