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Gold-coloured Twister circuit board drill 3.95 mm diameter

M.A. Ford

M.A. Ford 30615550 Twister Circuit Board Drill 3.95 mm

SKU CH-RPDM-HFM56

A 3.95 mm circuit board drill designed for precise drilling in large-size boards

  • Twister design for clean holes in circuit boards
  • 95 mm diameter suits precise drilling tasks
  • M.A. Ford brand trusted for cutting-tool performance
  • Ships free on manufacturer-direct orders over $75
  • California Proposition 65 warning for cancer and reproductive-harm chemicals

Drill Bit for Circuit Boards

The M.A. Ford 30615550 Twister is a large-size circuit board drill with a 3.95 mm cutting diameter. It is designed for precision drilling in printed circuit board manufacturing and repair workflows. The tool targets professional technicians and production engineers who require accurate hole placement in composite substrates.

Drilling Limits in Composite Materials

The 3.95 mm diameter sets the maximum hole size this bit can produce in a single pass. Circuit board substrates such as FR-4 impose practical limits on feed rate and spindle speed to prevent delamination or burr formation. Operators must match machine parameters to the material thickness and copper weight used in each job.

Replacing Worn or Undersized Bits

This drill replaces bits that have dulled from abrasive glass-fibre reinforcement or that are too small for required via and through-hole dimensions. The upgrade is justified when hole tolerance demands exceed the capability of a worn tool or when a design change calls for the larger 3.95 mm diameter.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $15.99
Cheaper than about 73% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameM.A. FORD

Questions about this item

Should I choose the 3.95 mm Twister drill or another size for my circuit board work?

Select the 3.95 mm size when your board layout calls for that exact hole diameter; other diameters are offered separately for different via or through-hole requirements.

How does the 3.95 mm diameter perform when drilling FR-4 panels on a CNC machine?

The 3.95 mm Twister drill produces clean, accurately sized holes in standard FR-4 material when run at recommended speeds and feeds for circuit board drilling.

What shank interface does the 30615550 use and what does it limit?

The drill uses a standard cylindrical shank that fits common collets or chucks; the shank diameter determines the minimum holder size and maximum run-out tolerance.

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