Dormer A100 Jobber Drill Bits are available in numbered sizes (N80 to N1) through industrial suppliers like Nuffield Engineering Supplies.
Key Features of Dormer A100 Series
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Material: High-Speed Steel (HSS)
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Point Angle: 118-degree standard point
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Finish: Steam oxide / black oxide finish to help retain coolant and prevent material buildup
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Design: Straight-shank jobber-length twist drill for general-purpose engineering, handheld use, and machine applications
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Size Range: Numbered sizes N80 to N1 (along with metric, fractional inch, and letter sizes)
Examples of Numbered Size Specifications
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No. 7: 5.11 mm diameter
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No. 21: 4.04 mm diameter
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No. 25: 3.8 mm diameter
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No. 29: 3.45 mm diameter
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No. 36: 2.71 mm diameter
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No. 42: 2.38 mm diameter
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No. 43: 2.26 mm diameter
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