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1/4" Dia, 2 Flute, Corner Radius End Mill - 91257

SERIES: 45C

Ski-Carb

1/4" Dia, 3/8" LOC, 3/8" Shank Dia, 0.0100" Radius, 2 Flute, 45 Degree Helix, Uncoated, Series 45C, Ski-Carb, Corner Radius End Mill - 91257

Feature & Benefits

Polished ski land with primary and secondary flute wall design minimizes chip interference by directing chips away from secondary flute
Circular land allows for increased control at various speed and feed rates ultimately reducing chatter
Recommended for materials ≤ 150 Bhn (≤ 7 HRc)

SKU / EDP	91257
Category	Solid Round Tools > Milling > High Performance Aluminum End Mills
Min Order Qty	1
Series	45C
Series Description	Ski-Carb
High Performance	Yes
End Configuration	Corner Radius
Tool Length	Stub
Unit (inch/mm)	inch
Number of Flutes	2
Primary Workpiece Material	(N) Non-Ferrous Materials
Secondary Workpiece Material	Plastics & Composites
Cutting Diameter (DC) (Decimal Inch)	0.2500
Cutting Diameter (DC) (Fractional Inch)	1/4
Cutting Diameter (DC) (mm)	6.35
Shank Diameter (DCON) (Decimal Inch)	0.3750
Shank Diameter (DCON) (Fractional Inch)	3/8
Shank Diameter (DCON) (mm)	9.53
Length of Cut (APMX) (Decimal Inch)	0.3750
Length of Cut (APMX) (Fractional Inch)	3/8
Length of Cut (APMX) (mm)	9.53
Overall Length (LF) (Decimal Inch)	2.5000
Overall Length (LF) (Fractional Inch)	2-1/2

Overall Length (LF) (mm)	63.50
Corner Radius (RE) (Decimal Inch)	0.0100
Corner Radius (RE) (mm)	0.25
Shank Length (LS) (Decimal Inch)	2.1250
Shank Length (LS) (Fractional Inch)	2-1/8
Shank Length (LS) (mm)	53.98
Cutting Diameter (DC) Tolerance (Decimal Inch)	+0.0000/-0.00035
Cutting Diameter (DC) Tolerance (mm)	+0.000/-0.009
Shank Diameter (DCON) Tolerance (ISO)	h6
Corner Radius (RE) Tolerance (Decimal Inch)	+0.0000/-0.0020
Corner Radius (RE) Tolerance (mm)	+0.000/-0.050
Shank Type	Weldon (Drive Flat)
Weldon Flat	Yes
Coolant Option	External Coolant
Coating Description	Bright/Uncoated
Additional Geometry	Right Hand Cut Direction (RHC)
Rake Angle	Positive
Helix Angle	Right Spiral
Helix Angle (Degree)	45
Variable Helix	No
Center Cutting	Yes
Chip Breaker	No

Alternative Products SKU / EDP to 91257

1/4" Dia, 2 Flute, Corner Radius End Mill - 91235

SGS 1/4" Dia, 3/8" LOC, 3/8" Shank Dia, 0.0100" Radius, 2 Flute, 45 Degree Helix, Ti-NAMITE-B (TIB2) Coated, Series 45C, Ski-Carb, Corner Radius End Mill - 91235

1/4" Dia, 2 Flute, Corner Radius End Mill - 91242

SGS 1/4" Dia, 3/8" LOC, 3/8" Shank Dia, 0.0100" Radius, 2 Flute, 45 Degree Helix, Ti-NAMITE-B (TIB2) Coated, Series 45C, Ski-Carb, Corner Radius End Mill - 91242