When you're shopping for tooling cutters abrasives, two 5-packs of carbide end mills can look nearly identical until you check the diameter and reach. One is a 1/4" long cutter from ZIMI; the other is a 3/8" stub cutter from OnlineCarbide. Both are solid carbide, 4-flute, and TiAlN-coated, but the size and length differences send them down different machining paths.
Quick verdict
If your work centers on 1/4" tooling and you want a longer reach for shallow grooves and profile cuts, the ZIMI set at $49.99 is the lower-cost route into a 5-pack. If your setup expects a 3/8" shank and a shorter, more rigid cut, the OnlineCarbide set at $147.95 is the higher-priced but diameter-specific alternative.
At a glance
| Spec | ZIMI 1/4" Long 4-Flute | OnlineCarbide 3/8" Stub 4-Flute |
|---|---|---|
| Price | $49.99 | $147.95 |
| Cutting diameter | 1/4" | 3/8" |
| Length of cut | 0.708" | 5/8" |
| Shank diameter | Not listed | 3/8" |
| Overall length | Not listed | 2" |
| Coating | AlTiN / TiAlN | AlTiN / TiAlN |
| Origin | China | United States |
| Pack size | 5 | 5 |
Where each wins
ZIMI wins on reach and price: the 0.708" length of cut is longer than the OnlineCarbide's 5/8", and the list price puts this pack far below the 3/8" set. The ZIMI listing also calls out compatibility with carbon steel, alloy steel, pre-hardened steel to HRC45, hardened steel, and cast iron.
OnlineCarbide wins on diameter and stub configuration: the 3/8" cutting diameter is larger, the overall length is 2", and the stub design with a 30° helix is built around rigidity. It's also labeled as made in the USA.
Product notes
5PCS 1/4" 4 FLUTE LONG CARBIDE END MILL - TiALN COATED
This ZIMI pack gives you five solid carbide milling bits with a 1/4" cutting diameter and a 0.708" length of cut. The AlTiN/TiAlN coating and hard alloy construction are matched to materials like carbon steel, alloy steel, pre-hardened steel up to HRC45, hardened steel, and cast iron. That covers a wide range of everyday shop metals. The longer flute reach is the main reason to choose this pack over a stub-length set: you can engage deeper for shallow-groove and profile work without stepping up to a larger tool. The trade-off is that the 1/4" diameter is fixed; if your toolpaths call for a 3/8" cutter, this pack won't get you there.
5 Pack 3/8" Solid Carbide End Mills - 4 Flute Stub Length TiAlN Coated USA
This OnlineCarbide set provides five 3/8" solid carbide end mills with a 3/8" shank, 2" overall length, and a 5/8" length of cut. The stub configuration keeps the tool compact for work that needs less reach, and the center-cutting design with a 30° helix is a different geometry from the long ZIMI cutter. The title highlights USA manufacture, which is a concrete point if you prefer domestically produced tooling. The limitation here is the shorter flute length: you'll have less reach than the ZIMI cutter, so deep-slotting jobs may need a longer tool. This set makes more sense when your toolholder expects the larger 3/8" diameter.
Final choice by use case
Choose the ZIMI 1/4" long set when you need deeper reach for moderate-depth work on steels and cast iron around the HRC45 range, and you want to keep your spend near the bottom of the price spread. Choose the OnlineCarbide 3/8" stub set when the larger diameter, compact stroke, center-cutting design, and USA origin matter more than the price gap.
