(G9D77) 4G Mill, X-Speed rougher, 4&5Flute Multiple Helix Corner Radius Roughing End Mill, Long Reac

Long-reach carbide X-Speed Rougher for pre-hardened steel

YG-1 G9D77 official product photograph · transparent
$123.20 INC GST $112.00 EX GST
SKU
G9D77060
Work materials
PMKN

Key features

  • Carbide X-coated long-reach corner-radius roughing end mill
  • 44°–45° multiple helix geometry supports chip evacuation and vibration reduction
  • Optimised roughing tooth profile reduces cutting forces
Tool material Carbide
Surface treatment YG-1 X Coating
Mill Diameter (mm)
Corner Radius (mm)
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High-feed roughing

Special tool geometry supports high-feed, heavy-cutting roughing applications.

Controlled chip flow

The unique flute design promotes chip evacuation and reduces vibration.

Plunge-ready end teeth

Strong end teeth support plunge and pocket milling operations.

SKUMill Diameter (mm)Corner Radius (mm)Overall length (mm)Shank dia. (mm)FlutesLength of cut (mm)Length below shank (mm)CAD filesStock Price Qty Add
G9D770606.0R0.5057.06.049.018.0STEPDXF 1-2 Weeks $112.00
G9D770808.0R0.5063.08.0412.024.0STEPDXF 1-2 Weeks $126.60
G9D7710010.0R0.5072.010.0415.030.0STEPDXF 1-2 Weeks $186.80
G9D7712012.0R0.5083.012.0418.036.0STEPDXF Low stock $186.20
G9D7716016.0R1.092.016.0524.048.0STEPDXF Low stock $151.48
G9D7720020.0R1.0104.020.0530.060.0STEPDXF 1-2 Weeks $530.60

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Product Description

YG-1 G9D77 4G Mill X-Speed Rougher is a long-reach carbide corner-radius roughing end mill. Its multiple-helix 44°–45° flute geometry improves chip evacuation and helps reduce machining vibration. Designed for pre-hardened steels up to HRc40, it supports high-feed, heavy-cutting roughing operations. Strong end teeth support plunge and pocket milling where reliable cutting-edge engagement is required. The optimal roughing tooth profile reduces cutting forces while producing uneven chips. Carbide X coating is engineered for long tool life and effective chip evacuation. Plain-shank options cover 6–20 mm diameters, with R0.5 and R1.0 corner-radius selections. Four-flute tools span 6–12 mm, while 16 and 20 mm diameters use five flutes.

  • Carbide X-coated long-reach corner-radius roughing end mill
  • 44°–45° multiple helix geometry supports chip evacuation and vibration reduction
  • Optimised roughing tooth profile reduces cutting forces
  • Strong end teeth support plunge and pocket milling
  • Suitable for pre-hardened steels up to HRc40
  • Plain-shank diameter range from 6–20 mm with four or five flutes
Product Data
Cutting Shape Corner Radius
Length Long, Long Reach
No. Flutes 5
Surface Treatment YG-1 X Coating
Tool Material Carbide

Work materials

VDI 3323 recommendations for this tool.

ExcellentGood

Steel

11 grades
Non-alloy steel
ExcellentVDI 3–5
GoodVDI 1–2
Low-alloy steel
ExcellentVDI 7–9
GoodVDI 6
High-alloy and tool steel
ExcellentVDI 11
GoodVDI 10

Cast iron

6 grades
Grey cast iron
ExcellentVDI 15–16
Nodular cast iron
ExcellentVDI 17–18
Malleable cast iron
ExcellentVDI 19–20

Stainless steel

3 grades
Stainless steel
GoodVDI 12–14

Non-ferrous materials

3 grades
Copper, bronze and brass
GoodVDI 26–28
VDI grade reference23 grades

Individual grade ratings and nominal hardness references. Base grades and decimal subgrades are listed separately.

Recommended VDI grades and nominal hardness references
VDIWork materialRecommendationHB ref.HRC ref.
1PNon-alloy steelGood125-
2PNon-alloy steelGood19013
3PNon-alloy steelExcellent25025
4PNon-alloy steelExcellent27028
5PNon-alloy steelExcellent30032
6PLow-alloy steelGood18010
7PLow-alloy steelExcellent27529
8PLow-alloy steelExcellent30032
9PLow-alloy steelExcellent35038
10PHigh-alloy and tool steelGood20015
11PHigh-alloy and tool steelExcellent32535
12MStainless steelGood20015
13MStainless steelGood24023
14MStainless steelGood18010
15KGrey cast ironExcellent18010
16KGrey cast ironExcellent26026
17KNodular cast ironExcellent1603
18KNodular cast ironExcellent25025
19KMalleable cast ironExcellent130-
20KMalleable cast ironExcellent23021
26NCopper, bronze and brassGood110-
27NCopper, bronze and brassGood90-
28NCopper, bronze and brassGood100-

HB and HRC values are nominal catalogue references. Grade subdivisions can vary between catalogues.

Recommendations apply to the listed VDI grades. Unlisted grades have no stated recommendation.

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