(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
$166.62 INC GST $151.48 EX GST
Was $425.34 Save 61%
SKU
G9D77160
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
Mill Diameter (mm)
Corner Radius (mm)
Loading stock…
South Korea Made in South Korea
Free standard delivery on orders over $500.
!If you're not 100% happy with your purchase, we'll replace or refund.
Buy Online

Buy now from our online retailers:

Select your preferred distributor:

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)Stock Price Qty Add
G9D770606.0R0.5057.06.049.018.0 1-2 Weeks $112.00
G9D770808.0R0.5063.08.0412.024.0 1-2 Weeks $126.60
G9D7710010.0R0.5072.010.0415.030.0 1-2 Weeks $186.80
G9D7712012.0R0.5083.012.0418.036.0 Low stock $99.41
G9D7716016.0R1.092.016.0524.048.0 Low stock $151.48
G9D7720020.0R1.0104.020.0530.060.0 1-2 Weeks $530.60

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

View Comparison
  • Overview
  • Specifications
  • Work Material
  • Reviews
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
EDP No. Radius Mill Diameter ShankDia Length of Cut Overall Length Mill Dia. Tolerance Shank Dia. Tolerance No. of Flute G9D76060 R0.50 6 6 12 57 0~-0.050 h5 4 G9D76060 R0.50 6 6 9 57 0~-0.050 h5 4 G9D76080 R0.50 8 8 12 63 0~-0.050 h5 4 G9D76080 R0.50 8 8 16 63 0~-0.050 h5 4 G9D76100 R0.50 10 10 15 72 0~-0.050 h5 4 G9D76100 R0.50 10 10 20 72 0~-0.050 h5 4 G9D76120 R0.50 12 12 18 83 0~-0.050 h5 4 G9D76120 R0.50 12 12 24 83 0~-0.050 h5 4 G9D76160 R1.0 16 16 24 92 0~-0.050 h5 5 G9D76160 R1.0 16 16 32 92 0~-0.050 h5 5 G9D76200 R1.0 20 20 30 104 0~-0.050 h5 5 G9D76200 R1.0 20 20 40 104 0~-0.050 h5 5

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.

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
EDP No. Radius Mill Diameter ShankDia Length of Cut Overall Length Mill Dia. Tolerance Shank Dia. Tolerance No. of Flute G9D76060 R0.50 6 6 12 57 0~-0.050 h5 4 G9D76060 R0.50 6 6 9 57 0~-0.050 h5 4 G9D76080 R0.50 8 8 12 63 0~-0.050 h5 4 G9D76080 R0.50 8 8 16 63 0~-0.050 h5 4 G9D76100 R0.50 10 10 15 72 0~-0.050 h5 4 G9D76100 R0.50 10 10 20 72 0~-0.050 h5 4 G9D76120 R0.50 12 12 18 83 0~-0.050 h5 4 G9D76120 R0.50 12 12 24 83 0~-0.050 h5 4 G9D76160 R1.0 16 16 24 92 0~-0.050 h5 5 G9D76160 R1.0 16 16 32 92 0~-0.050 h5 5 G9D76200 R1.0 20 20 30 104 0~-0.050 h5 5 G9D76200 R1.0 20 20 40 104 0~-0.050 h5 5

Sale

You Might Also Like

K-2 Plus 2FL 35deg. Helix Long Endmill K-2 Plus 2FL 35deg. Helix Long Endmill

K-2 Plus 2FL 35deg. Helix Long Endmill

From $7.20INC GST
From $6.55 EX GST
Available in Mill Diameter (mm)
2.0 3.0 4.0 +5
In stock
YG-1 LEGEND AlTiN YG-1 LEGEND CARBIDE YG-1 LEGEND HELIX 30 YG-1 LEGEND SHANK PLAIN
Add to Cart
(E5E47) Alu-Power Carbide 1Flute End Mill, Plain Shank (E5E47) Alu-Power Carbide 1Flute End Mill, Plain Shank

(E5E47) Alu-Power Carbide 1Flute End Mill, Plain Shank

Uncoated one-flute carbide end mill for non-ferrous materials
From $14.34INC GST
From $13.04 EX GST
Available in Mill Diameter (mm)
2.0 3.0 4.0 +5
In stock
Add to Cart
(GMG12) V7 Plus Carbide, 6Flute End Mill, Long length, Plain Shank (GMG12) V7 Plus Carbide, 6Flute End Mill, Long length, Plain Shank

(GMG12) V7 Plus Carbide, 6Flute End Mill, Long length, Plain Shank

YG-1 V7 Plus GMG12 Plain-Shank Six-Flute End Mill
From $57.06INC GST
From $51.88 EX GST
Available in Mill Diameter (mm)
6.0 8.0 10.0 +4
In stock
YG-1 LEGEND 6 flutes
Add to Cart
(G9432) K-2 Carbide, 4Flute End Mill, Short Length (G9432) K-2 Carbide, 4Flute End Mill, Short Length

(G9432) K-2 Carbide, 4Flute End Mill, Short Length

TiAlN-coated solid carbide four-flute short-length end mill
From $10.80INC GST
From $9.82 EX GST
Available in Mill Diameter (mm)
1.0 1.5 2.0 +16
In stock
Add to Cart
Excision

(E5D70) Alu-Cut 2Flute End Mill Long / Extra Length, Plain Shank

From $33.79INC GST
From $30.72 EX GST
Available in Mill Diameter (mm)
1.0 1.2 1.5 +18
In stock
YG-1 LEGEND BRIGHT YG-1 LEGEND CARBIDE YG-1 LEGEND HELIX SQUARE 45 YG-1 LEGEND SHANK PLAIN YG-1 LEGEND SHANK YG-1 STANDARD
Add to Cart
K-2 CARBIDE 4 Flute Multiple Helix Short End Mill (G9H73) 4 Piece Set K-2 CARBIDE 4 Flute Multiple Helix Short End Mill (G9H73) 4 Piece Set

K-2 CARBIDE 4 Flute Multiple Helix Short End Mill (G9H73) 4 Piece Set

$237.73INC GST
$216.12 EX GST
In stock
YG-1 LEGEND CARBIDE
Add to Cart
(GMG55) V7 Plus Carbide, 4Flute Multi Helix Ball Bose End Mill, Long length, Plain Shank (GMG55) V7 Plus Carbide, 4Flute Multi Helix Ball Bose End Mill, Long length, Plain Shank

(GMG55) V7 Plus Carbide, 4Flute Multi Helix Ball Bose End Mill, Long length, Plain Shank

Long-length four-flute carbide ball nose end mill
From $59.05INC GST
From $53.69 EX GST
Available in Mill Diameter (mm)
4.0 5.0 6.0 +5
In stock
Add to Cart
(E5908) Alu-Power Carbide 3Flute Ball Nose End Mill, Plain Shank (E5908) Alu-Power Carbide 3Flute Ball Nose End Mill, Plain Shank

(E5908) Alu-Power Carbide 3Flute Ball Nose End Mill, Plain Shank

3 Flute 40° Helix Ball Nose End Mill
From $43.89INC GST
From $39.90 EX GST
Available in Mill Diameter (mm)
2.0 2.5 3.0 +8
In stock
Add to Cart
(E5E49) Alu-Power Carbide 3Flute End Mill, Long Length, Plain Shank (E5E49) Alu-Power Carbide 3Flute End Mill, Long Length, Plain Shank

(E5E49) Alu-Power Carbide 3Flute End Mill, Long Length, Plain Shank

Long-Length 3-Flute Carbide End Mill for Aluminium
From $30.58INC GST
From $27.80 EX GST
Available in Mill Diameter (mm)
3.0 4.0 5.0 +7
In stock
Add to Cart

Resources

Understanding the Basics of Endmills

Understanding the Basics of Endmills

Endmills are indispensable tools in machining, renowned for their versatility and precision. Whether you’re a seasoned operator or new to machining, understanding...
Connor Urquhart Connor Urquhart

Article

Service & Delivery

How do I purchase my items?

Excision products are available through 300+ local distributors around Australia. Some products may also have buy online options available for online purchase through our distributors.

Find your local distributor

What delivery services do we offer?

We freight out of Melbourne every day for 1-3 days delivery to your local distributor. We also offer upon request (for an extra charge):

  • Send direct
  • Air frieght for small urgent items

How do I return an item?

We offer lifetime returns. If you’re unhappy with your purchase, you can return unused items to us for free – no questions asked.

Have a question about this product?

Contact Sales

+61 (03) 5551 4555

Mon - Fri 7am - 5pm