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25/64 (.3906) Extension Drill Bit Cobalt 6 Long

25/64 (.3906) Extension Drill Bit Cobalt 6 Long

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Part numbers : RX1-12-04370 , 4040-3906 , 12-04370
Unit of Measure: EA

28.88 EUR / EA 28.88 EUR 28.88 € excl. VAT

28.88 EUR / EA excl. VAT

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Availability
Up to 3 EA ready to ship on Thursday 2026-09-10
Order before 16:00 CET on Tuesday 2026-09-08

Cobalt extension drill bit for drilling operations where additional reach is required in confined areas.

  • Nominal drill diameter: 25/64 in (0.3906 in / approximately 9.9 mm)
  • Nominal overall length: 6 in (approximately 152 mm)
  • Manufacturer part number: 4040-3906
  • NAS 965 Type D construction
  • Threaded square shank with 1/4-28 UNF Class 2A thread
  • Steam-oxide surface treatment

The cobalt drill is intended for work on hard, tough and high-tensile-strength materials. Verify the required drill size, thread interface and maintenance data before use.

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