Keo 55215


Counterbore, Close Fit, Size 1/4, Cobalt

55215 532924
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$68.63+ 6 Business Day Shipping $7.15


TypeBuilt-in Pilot
StyleNominal/Close Fit
Number of Flutes3
Screw Size1/4"
Screw TypeSocket Head Cap Screws
Bore Dia. (In.)0.382
Pilot Dia. (In.)0.250
Pilot Length (In.)5/16
Shank Dia. (In.)5/16
Overall Length (In.)4-1/2
MaterialCobalt Steel
Application For Use In Alloys, Cast Iron, Stainless Steel And Titanium
Package Quantity 1
Tool MaterialM35 Cobalt: High Speed Steel, 6% Tungsten, 5% Moly, 5% Cobalt
Overall Length4.5"
Pilot Diameter
Decimal Inch0.250"
Shank Diameter5/16"
Pilot TypeIntegral Pilot
Weight 0.160000


Counterbore, Built-in Pilot, Nominal/Close Fit, Number of Flutes 3, Screw Size 1/4 In, Socket Head Cap Screws, Bore Dia 0.382 In, Pilot Dia 0.250 In, Pilot Length 5/16 In, Shank Dia 5/16 In, Overall Length 4 1/2 In, Cobalt Steel

Socket Head Cap Screw Counterbores
  • Secondary relief behind the cutting edge margin provides high-performance cutting with minimal power. Can be used on all types of machines. Optimized helix design flows chips away from the tool, eliminating smearing and material buildup on the cutting edges and keeping chips from packing into flutes.
  • Straight shank with built-in pilot 3-flute Cobalt high speed steel construction

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