Choosing the right workholding clamp for a CNC or manual milling setup usually comes down to jaw capacity versus cost. Here are two bench vises that make that trade-off concrete: a 6-inch bench clamp and a 4-inch lock-down vise. The six-inch listing is priced at USD 91.10; the four-inch is priced at USD 56.17. That is a $34.93 difference, and the better pick depends on the size of the parts you clamp.
The six-inch model brings a wider jaw and a heavier body; the four-inch model brings a smaller footprint and a stated maximum clamping force.
Quick Verdict: If you regularly hold wider blanks and want a heavier base, the 6'' Machine Vise is the straightforward choice. If a compact 4-inch grip with a stated 19 kN clamping force fits your typical workpieces and you want the lower listed price, the 4'' Precision Vise is the practical pick.
Where each product wins
- 6'' Machine Vise: Wins on jaw width and opening (6 inches and 5.9 inches), and lists a 59.4-lb gross weight with an HT250 gray cast iron body. This is the larger, heavier option.
- 4'' Precision Vise: Wins on listed price and compactness. It specifies a maximum clamping force of 19 kN, and its 4-inch jaw width and opening capacity suit smaller workpieces.
The table below lines up the listed prices and the key dimensions.
| Product | Listed Price | Price Bar | Key Specs |
|---|---|---|---|
| 6'' Machine Vise Precision CNC Milling Machine Bench Clamp Vice Lock Vise | USD 91.10 | Jaw Width 6", Jaw Opening 5.9", Body Material HT250 Gray Cast Iron | |
| 4" Precision Vise Lockdown CNC Milling Machine Vise Clamping Vice Plier Milling | USD 56.17 | Jaw Width 4", Jaw Opening Capacity 4", Material Cast Iron, Max Clamping Force 19 kN |
The $34.93 price gap matters only if the smaller vise fits your workpieces. The six-inch model gives you room for wider material, while the four-inch model lists a specific clamping force, which can be useful if you are matching a vise to a particular job.
6'' Machine Vise Precision CNC Milling Machine Bench Clamp Vice Lock Vise
The 6'' Machine Vise gives you a 6-inch jaw width and a 5.9-inch jaw opening, which is room enough for wider workpieces. The listing matches that to an HT250 gray cast iron body and a 45# steel jaw, with a gross weight of 59.4 lbs. That mass can help keep the clamp stable during heavier milling. The trade-off is the amount of bench space and capacity: if most of your parts are smaller than this two-jaw opening, you may be handling a heavier vise than you need. Choose it when you regularly hold wider blanks.
4" Precision Vise Lockdown CNC Milling Machine Vise Clamping Vice Plier Milling
The 4'' Precision Vise takes the opposite approach. Its 4-inch jaw width and 4-inch opening capacity are sized for smaller parts, and the listing states a maximum clamping force of 19 kN. The body is cast iron and the jaw is 45# steel. The limitation is the work envelope: parts wider than 4 inches won't fit. Choose this vise when your typical blanks are compact and you want a stationary clamp with a stated clamping force.
Final choice by use case: If your workholding tasks involve six-inch-wide parts, the 6'' Machine Vise is the right call. If you are machining smaller components and want a more compact clamp, the 4'' Precision Vise is the practical alternative.
