Quick Answer
For protecting finished parts and round stock on a 4-inch vise, choose soft jaws; for maximum precision and rigid clamping on a compact bench, choose the 3-inch screwless vise.
Precision vs. Protection: The Core Trade-Off
The 3-inch screwless vise is built for exacting work. Its one-piece body and hardened jaws (Rc 58-62) hold parts with all sides flat, square, and parallel to 0.0002". That level of accuracy suits setups where you need repeatable, rigid clamping for milling or drilling.
In contrast, 4-inch soft jaws prioritize protecting the workpiece. Made of hardened aluminum, they mount onto a 4-inch vise with magnets and include a V-groove for round objects. They won't scratch delicate surfaces, but they don't offer the same precision alignment as a screwless vise.
Workpiece Size and Shape Considerations
The 3-inch screwless vise opens to 3.78" and includes horizontal and vertical vees on the movable jaw for holding round objects. Its compact footprint (7.28" long, 2.76" tall, 2.875" wide) suits smaller workpieces and tight bench spaces.
Soft jaws are designed for a 4-inch vise, so they suit larger parts that fit within that jaw width. The V-groove helps with round stock, but the overall clamping capacity depends on the vise itself.
Trade-Offs at a Glance
- Precision vs. Protection: Choose the screwless vise for extreme accuracy; choose soft jaws when surface finish matters more than alignment.
- Workpiece Size: The screwless vise opens to 3.78" and is compact; soft jaws fit a 4-inch vise, allowing larger parts. Measure your typical workpiece to see which capacity fits.
- Round Stock Handling: Both options handle round objects—the screwless vise has vees on the movable jaw; soft jaws have a V-groove. For heavy round stock, the screwless vise's hardened vees offer more rigidity.
Product Facts
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Vise, 3" Screwless with Hold Down Clamps: The 3" screwless vise has a one-piece body, hardened to Rc 58-62, with all sides flat, square, and parallel to 0.0002". This extreme precision makes it ideal for setups where exact alignment and rigidity are critical.
Vise, 3" Screwless with Hold Down Clamps
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Soft Jaws, 4" Vise: The 4" soft jaws are made of hardened aluminum and mount with magnets that can be removed for cleaning. They protect delicate work from scratches while still offering a V-groove for round objects.
Soft Jaws, 4" Vise
Which Should You Choose?
Best For
- Machinists needing extreme precision and rigidity for small parts.
- Users who frequently clamp round stock and require a compact, durable vise.
Not For
- Jobs that require protecting finished surfaces from scratches—use soft jaws instead.
- Workpieces wider than 3.78"—the screwless vise won't accommodate them.