Choosing a machine vise for your milling setup is one of those workholding decisions that can make or break a job. In the workholding fixturing metrology space, you want jaws that hold rigidly, open wide enough for your parts, and don't flex under heavy cuts. The two vises here sit at opposite ends of the price scale: a 6-inch single-station precision vise at $400 and a 4-inch lockdown CNC vise at $56.17. Let's see which one fits your shop.
Quick Verdict
If you routinely clamp oversized or heavier workpieces and need an extra-wide jaw opening, the 6-inch Precision Machine Vise is the one to buy. If you're outfitting a compact bench or need a ready-to-use 4-inch vise for smaller milling jobs, the Lockdown CNC Vise makes sense.
Comparison at a Glance
| Spec | 6-Inch Precision Machine Vise | 4-Inch Lockdown CNC Vise |
|---|---|---|
| Listed Price | $400.00 | $56.17 |
| Jaw Width | 6 in | 4 in |
| Jaw Opening | 7-1/2 in | 4 in |
| Condition | New - Open box | New |
| Base Motion | Stationary | Stationary |
| Material | Cast Iron | Cast Iron |
Where Each Product Wins
- 6-Inch Precision Machine Vise: Wins on jaw opening and load capacity. The 7-1/2-inch max opening and 7,875-lb rating make it the stronger choice for large or heavy parts.
- 4-Inch Lockdown CNC Vise: Wins on condition and footprint. It's listed as new rather than open-box, and its 4-inch size fits tighter setups.
6-Inch Precision Machine Vise
This single-station stationary vise offers a 6-inch jaw width and a maximum jaw opening of 7-1/2 inches, which means it can hold parts that won't fit in a 4-inch vise. Its cast iron body and 7,875-lb load capacity give it serious rigidity for heavier milling passes. The trade-off is the open-box condition: it is sold as New - Open Box because it was used for demonstration or display. The vise itself has never been used and ships in the original packaging, but if you prefer everything factory-fresh, that's a limitation to consider. Choose this one when your workpieces are too large or too heavy for a compact vise.
4-Inch Lockdown CNC Vise
This 4-inch lockdown vise brings a new-condition stationary base and a 4-inch jaw opening to the table. The jaw is made from 45# steel with high-frequency quenching, and the body is HT250 cast iron, so it holds up in repetitive clamping. With a 19-kN max clamping force, it can secure smaller parts firmly without a bulky footprint. The obvious limitation is jaw capacity: anything wider than 4 inches won't fit, and you'll be reaching for a larger vise. That makes it a sensible pick when your workpieces are small and your machining area is tight.
Final Choice by Use Case
- Choose the 6-Inch Precision Machine Vise for large workpieces and heavy milling operations where the 7-1/2-inch opening and 7,875-lb capacity make a real difference.
- Choose the 4-Inch Lockdown CNC Vise for smaller parts and lighter cuts, especially if you want a new, stationary vise that won't dominate your bench.
