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MFMHV-304-20-100-TC-CB

3 Flute X-Long Reach Metric High Velocity Solid Carbide End Mill for Aluminum

RobbJack high-velocity end mill — the flagship for long, chatter-free aluminum cutting, necked for reach, on both standard and the highest-performance machining centers made today. 20mm Dia 3-Flute Metric End Mill 25.03mm LOC, 20mm Shank, 140mm OAL, 1mm CR

3 Flute X-Long Reach Metric High Velocity Solid Carbide End Mill for Aluminum — MFMHV-304-20-100-TC-CB
Series photo — representative of the MFMHV-304 family
OAL 140 mmFlute 25.03 mmReach 92 mmShank Ø20 mmCutter Ø20 mmR1 mmBlend 15°
Scaled drawing — true to this tool's dimensions (mm)
Speeds & FeedsDialed to this exact tool — free
Free CAD & DataSTEP 3DDXF 2DISO CSVCAM library
RobbJack FMHV Series 2-flute ultra-high-velocity aluminum end mill with necked reach and 37-degree helix

Ultra-high-velocity 2 and 3 flute aluminum end mills with reach and radii for high-horsepower spindles — the guide warns these tools 'can max out all machines made today.'

  • 2 flute (FMHV-201–205) and 3 flute (FMHV-301–305), 37° helix, with Feather Blend, necked reach, Mirror Edge, and thru-coolant holes
  • Built for ultra-high velocity: guide speeds & feeds are based on 175-horsepower / 130-kilowatt machines with short stickout — 'these tools can max out all machines made today. Adjust speeds and feeds to the machine and application… Be careful!'
  • Run at Max Tap Tested RPM (or Max RPM) with chip loads from .002–.004 (1/4") up to .008–.015 (1") per tooth, at depths from .100" up to .900" — slot or profile, but stay away from 50% radial step-over
  • Four reach lengths per diameter, short to extra-long (e.g. 1/4": 3/4", 1-1/16", 1-1/2"… on 2"–3" OALs); other reach lengths available upon request
  • Inch sizes 1/4"–1"; metric MFMHV line runs 6–25 mm with 2 and 3 cutting-edge versions in the same tables
  • Corner options: square end, radii of .03", .06", .09" (metric 0.5/1/2 mm), and ball end (-BN)
  • Every geometry in four builds: uncoated, DLC, thru-coolant (-TC), and thru-coolant DLC
  • The 3-flute FMHV features the guide's ALL-NEW balanced end design — marked 'CANNOT PLUNGE', so enter with helical interpolation or ramping
  • Applications: slotting, side milling, helical interpolation, ramping, high-performance 3-D (2-flute), roughing, semi-finishing, finishing — wet; materials: aluminum, copper, magnesium, brass
  • h4 shank tolerance, up to 150% more gripping force — tightest in the industry; tolerances: cutting dia −.001/−.0015, shank −.0001/−.0002, flute length +.060/−.000

From the RobbJack Applications Guide.

Mirror Edge: clean, even edge
Mirror Edge: clean, even edge — Magnified edge view showing the smooth, continuous cutting edge FMHV tools carry — RobbJack's edge preparation dampens vibration to help eliminate chatter at ultra-high velocity.
What a compromised edge looks like
What a compromised edge looks like — The comparison view: an edge with a visible chip/notch under the same magnification — the kind of edge damage that shows up as chatter, finish defects, and early tool death at high feed rates.

About this series

FMHV / MFMHV High-Velocity Aluminum End Mills

The flagship for long, chatter-free aluminum cutting.

High-velocity, necked-reach end mills engineered for aggressive aluminum machining — from standard machining centers to the highest-horsepower, highest-rpm spindles made today. Patented Mirror-edge geometry clears chips fast and runs clean at long reach.

  • Necked reach (short / medium / long / extra-long) clears the work and holds rigidity
  • Patented Mirror-edge geometry for a polished cut and fast chip evacuation
  • Square, corner-radius and ball-nose options; thru-coolant and DLC available
  • 2- and 3-flute, inch (FMHV) and metric (MFMHV)

Headline spec

Peak MRR up to 604 in³/min (1" 3-flute, thru-coolant + DLC)

Best for

  • High-speed aluminum roughing & finishing
  • Aerospace structures
  • Long-reach pockets

Specifications

US machining terms with ISO 13399 codes.

Cutting DiameterDC
20 mm
Shank DiameterDMM
20 mm
Length of Cut (LOC)APMX
25.03 mm
Reach (LBS)SDL
92 mm
Neck DiameterND
19 mm
Overall Length (OAL)OAL
140 mm
Corner RadiusRE
1 mm
Number of FlutesNOF
3
Helix AngleFHA
37°
Blend Angle (neck→shank)
15°
Feather Blend
10°
End Type
Corner Radius
Center Cutting
No — cannot plunge
Thru-Coolant
Yes
Series
MFMHV-304 — 3 Flute X-Long Reach Metric High Velocity Solid Carbide End Mill for Aluminum

Cuts these materials

AluminumCopper & Brass

Applications

SlottingSide MillingAxial DepthHelical InterpolationRadial Step OverConventionalRampingHigh Performance3-DHigh-SpeedRoughingSemi-FinishingFinishingWet

Features

Feather BlendNeckedMirror Edge

Tolerances

TypeMinMax
Cutting Diameter-0.025-0.038
Length of Cut+1.5240
Overall Length+1.524-1.524
Shank Diameter-0.003-0.005
Starting at$601.25

Made & shipped in the USA · lead time confirmed at order. Buy at retail or through your distributor.

Performance guaranteed. Run it against the tool you use today — if it doesn't beat it, we'll make it right.

Minimum order quantity: 3

Adds Diamond-Like Carbon (DLC) · $644.05 — our pick for your material. Choose another finish below.

Calculate Speeds & Feeds
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Download ISO 13399 data (.csv)

Proven in the field

See the case studies →

Finishes (2)

  • Uncoated

    MFMHV-304-20-100-TC-CB

    $601.25

    Available to order

  • Diamond-Like Carbon (DLC)Rec

    MFMHV-304-20-100-DLC-TC-CB

    $644.05

    Available to order

Compare tool coatings →

Volume pricing

QtyUnit price
3+$601.25
6+$412.15
12+$372.85
24+$339.05
48+$316.65

List price per unit · Uncoated. Coated finishes priced higher.

Starting at

$601.25

Performance guaranteed

More in the MFMHV-304 series

Same series, different size — what changes from this tool is shown in red.