4G MILL 2 Flute 30°Helix Rib End Mill (SEM845)
Extended Neck Rib-Processing Square End Mill
- SKU
- SEM84500101E
Key features
- Two-flute 30° helix cutting geometry
- Square end profile for rib-processing features
- Extended neck for added feature clearance
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Access confined features
Extended neck geometry improves clearance when machining detailed and recessed rib forms.
Defined square profile
Square end geometry supports rib features requiring flat bases and defined corners.
Precise size selection
A 0.1 mm to 12 mm diameter range suits fine through to larger rib features.
| SKU | Mill Diameter (mm) | Overall length (mm) | Shank dia. (mm) | Length of cut (mm) | Length below shank (mm) | Neck dia. (mm) | Stock | Price | Qty | Add |
|---|---|---|---|---|---|---|---|---|---|---|
| SEM84500101E | 0.1 | 40.0 | 4.0 | 0.15 | 0.5 | 0.085 | 1-2 Weeks | $107.10 | ||
| SEM84500201E | 0.2 | 40.0 | 4.0 | 0.3 | 0.5 | 0.17 | 1-2 Weeks | $76.40 | ||
| SEM84500301E | 0.3 | 40.0 | 4.0 | 0.5 | 1.0 | 0.27 | 1-2 Weeks | $82.50 | ||
| SEM84500401E | 0.4 | 40.0 | 4.0 | 0.6 | 1.0 | 0.37 | 1-2 Weeks | $60.40 | ||
| SEM84500501E | 0.5 | 45.0 | 4.0 | 0.7 | 1.0 | 0.45 | 1-2 Weeks | $55.80 | ||
| SEM84500602E | 0.6 | 45.0 | 4.0 | 0.9 | 2.0 | 0.55 | 1-2 Weeks | $55.80 | ||
| SEM84500702E | 0.7 | 45.0 | 4.0 | 1.2 | 2.0 | 0.65 | 1-2 Weeks | $55.80 | ||
| SEM84500802E | 0.8 | 45.0 | 4.0 | 1.2 | 2.0 | 0.75 | 1-2 Weeks | $55.80 | ||
| SEM84500908E | 0.9 | 45.0 | 4.0 | 1.3 | 8.0 | 0.85 | 1-2 Weeks | $64.50 | ||
| SEM84501002E | 1.0 | 50.0 | 4.0 | 1.5 | 2.0 | 0.95 | 1-2 Weeks | $49.10 | ||
| SEM84501204E | 1.2 | 50.0 | 4.0 | 1.8 | 4.0 | 1.15 | 1-2 Weeks | $49.10 | ||
| SEM84501406E | 1.4 | 50.0 | 4.0 | 2.1 | 6.0 | 1.35 | 1-2 Weeks | $49.10 | ||
| SEM84501504E | 1.5 | 50.0 | 4.0 | 2.3 | 4.0 | 1.45 | 1-2 Weeks | $49.10 | ||
| SEM84501608E | 1.6 | 50.0 | 4.0 | 2.3 | 8.0 | 1.55 | 1-2 Weeks | $49.10 | ||
| SEM84501808E | 1.8 | 50.0 | 4.0 | 2.7 | 8.0 | 1.75 | 1-2 Weeks | $49.10 | ||
| SEM84502006E | 2.0 | 50.0 | 4.0 | 4.0 | 6.0 | 1.95 | 1-2 Weeks | $67.00 | ||
| SEM84502508E | 2.5 | 50.0 | 4.0 | 4.0 | 8.0 | 2.4 | 1-2 Weeks | $49.10 | ||
| SEM84503006E | 3.0 | 50.0 | 6.0 | 4.5 | 6.0 | 2.85 | Low stock | $40.36 | ||
| SEM84504008E | 4.0 | 50.0 | 6.0 | 6.0 | 8.0 | 3.85 | 1-2 Weeks | $55.80 | ||
| SEM84505016E | 5.0 | 60.0 | 6.0 | 8.0 | 16.0 | 4.85 | 1-2 Weeks | $57.40 | ||
| SEM84506015E | 6.0 | 60.0 | 6.0 | 9.0 | 15.0 | 5.85 | 1-2 Weeks | $57.40 | ||
| SEM84508025E | 8.0 | 70.0 | 8.0 | 12.0 | 25.0 | 7.7 | 1-2 Weeks | $93.50 | ||
| SEM84510030E | 10.0 | 75.0 | 10.0 | 15.0 | 30.0 | 9.7 | 1-2 Weeks | $121.40 | ||
| SEM84512035E | 12.0 | 80.0 | 12.0 | 20.0 | 35.0 | 11.7 | 1-2 Weeks | $163.40 |
Add 4G MILL 2 Flute 30°Helix Rib End Mill (SEM845) to comparison
View Comparison- Overview
- Specifications
- Work Material
- Reviews
YG-1 4G MILL SEM845 is a two-flute, 30° helix square end mill with extended neck geometry. It is intended for rib-processing operations requiring access around narrow detailed workpiece features. Y-Coating is specified for the SEM845 configuration within the 4G MILL range. The square cutting profile is suited to milling flat-base rib features with defined corners. The extended neck gives clearance for tool access in recessed or confined feature areas. Plain-shank variants provide a straightforward interface for compatible milling toolholding systems. Available cutting diameters run from 0.1 mm to 12 mm across the family. This compact diameter range supports precise selection for small to medium-scale rib features. Select a diameter appropriate to the rib size and access requirements.
- Two-flute 30° helix cutting geometry
- Square end profile for rib-processing features
- Extended neck for added feature clearance
- Y-Coating specified for the SEM845 series
- Plain shank configuration
- Available in 0.1 mm to 12 mm diameters
| Cutting Shape | Square |
| Length | Extended Neck |
| No. Flutes | 2 |
| Tool Material | Carbide |
Work materials
VDI 3323 recommendations for this tool.
Steel
11 gradesCast iron
6 gradesStainless steel
3 gradesHardened materials
3 gradesVDI grade reference23 grades+
Individual grade ratings and nominal hardness references. Base grades and decimal subgrades are listed separately.
| VDI | Work material | Recommendation | HB ref. | HRC ref. |
|---|---|---|---|---|
| 1 | PNon-alloy steel | Good | 125 | - |
| 2 | PNon-alloy steel | Good | 190 | 13 |
| 3 | PNon-alloy steel | Good | 250 | 25 |
| 4 | PNon-alloy steel | Excellent | 270 | 28 |
| 5 | PNon-alloy steel | Excellent | 300 | 32 |
| 6 | PLow-alloy steel | Good | 180 | 10 |
| 7 | PLow-alloy steel | Excellent | 275 | 29 |
| 8 | PLow-alloy steel | Excellent | 300 | 32 |
| 9 | PLow-alloy steel | Excellent | 350 | 38 |
| 10 | PHigh-alloy and tool steel | Good | 200 | 15 |
| 11 | PHigh-alloy and tool steel | Excellent | 325 | 35 |
| 12 | MStainless steel | Good | 200 | 15 |
| 13 | MStainless steel | Good | 240 | 23 |
| 14 | MStainless steel | Good | 180 | 10 |
| 15 | KGrey cast iron | Good | 180 | 10 |
| 16 | KGrey cast iron | Good | 260 | 26 |
| 17 | KNodular cast iron | Good | 160 | 3 |
| 18 | KNodular cast iron | Good | 250 | 25 |
| 19 | KMalleable cast iron | Good | 130 | - |
| 20 | KMalleable cast iron | Good | 230 | 21 |
| 38 | HHardened steel | Good | 550 | 55 |
| 40 | HChilled cast iron | Excellent | 400 | 42 |
| 41 | HHardened cast iron | Good | 550 | 55 |
No grades match your search.
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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