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Silver cylindrical end mill with rounded ball tip and four spiral flutes

M.A. Ford

M.A. Ford 16531250 Tuffcut GP 4 Flute Ball Nose End Mill Stub 5/16 pneumatic accessory

SKU CH-MB5J-2XZ3B

A 5/16 inch stub-length ball nose end mill with four flutes for general-purpose milling

  • 4-flute ball nose design enables smooth contouring and profiling in milling operations
  • Stub length configuration provides enhanced rigidity for reduced deflection during heavy cuts
  • 5/16 inch diameter suits standard tooling requirements for general-purpose machining tasks
  • TuffCut GP series delivers reliable performance across a range of ferrous and non-ferrous materials
  • M.A. Ford manufacturing ensures consistent quality for professional workshop use

Tuffcut GP 4-Flute Ball Nose End Mill

The M.A. Ford 16531250 is a stub-length carbide end mill designed for general-purpose milling in a variety of materials. Its four-flute geometry and ball nose profile suit contouring, profiling and pocketing operations where a radiused corner is required. Machinists and maintenance technicians use it for both roughing and finishing passes on CNC mills and manual machines.

Stub Length and 5/16 Inch Diameter Constraints

The short flute length limits depth of cut to shallow passes, reducing deflection but restricting reach in deep cavities. A 5/16 inch cutting diameter sets the minimum internal radius and stepover distance achievable with this tool. Users must match spindle speed and feed rate to the machine rigidity and workpiece material to avoid chatter or premature wear.

Four-Flute Capacity and Material Limits

Four flutes provide higher feed rates and better surface finish in medium to high-hardness steels, stainless alloys and cast iron compared to two-flute tools. Chip evacuation becomes the limiting factor in deep slots or soft, gummy materials where flute packing occurs. The stub design offers maximum rigidity for shallow features but cannot replace longer tools for deep-pocket work.

How it compares

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

Price $34.99
Pricier than about 57% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameM.A. FORD

Questions about this item

Is the 16531250 the only Tuffcut GP 4 flute ball nose stub available in 5/16?

The manufacturer lists this part number as the 5/16 inch stub length option in the Tuffcut GP range.

What does the 4 flute design actually change when I put this end mill in a CNC router?

Four flutes give a finer finish and higher feed rates in steel than two or three flute tools, but they evacuate chips less aggressively in deep slots.

Will the 5/16 shank fit a standard ER16 collet or do I need a different holder?

A 5/16 inch shank matches an 8 mm collet bore; an ER16 collet rated for 8 mm will hold it securely.

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