NR-303-12

2, 3, and 4 flute C-2 grade carbide end mills in standard length -- an economical non-ferrous line in 64th-inch sizes from 1/16" to 1", with explicit flats and no-flats part numbers and DLC coating.

• C-2 carbide grade, square end, 30-degree helix, standard length in three flute counts: NR-204 (2 flute), NR-303 (3 flute), NR-404 (4 flute)
• Comes in 64th-inch sizes -- 2 and 4 flute tables run from 1/16" to 1" including half sizes; 3 flute from 1/16" to 3/4"
• Flats and no-flats versions carry distinct part numbers: sizes on 3/8" and 1/2" shanks (plus 5/8", 3/4", 1") are listed both with flats and as -NF no-flats tools; smaller sizes come without flats
• Coating options are uncoated or DLC (Diamond-Like Carbon), in both flats and no-flats versions
• Metric MNR-204 (2 flute) and MNR-303 (3 flute) run 2 mm to 25 mm; metric tools do not have flats
• Applications: slotting, side milling, and helical interpolation (2 and 3 flute), side milling and high performance work from roughing through finishing; run dry, wet, cold air, or spray mist
• Materials: aluminum, copper, magnesium, plastics, composites, brass, and wood
• Tolerances: cutting diameter +.001/-.000, shank diameter -.0001/-.0002, flute length +.030/-.000 (1/16" to 5/16") or +.060/-.000 (21/64" to 1"), OAL +/-.060; MNR cutting diameter +.025/-.000 mm

From the RobbJack Applications Guide.