How to Choose the Right CNC Vise for Your Machining Application

Workholding is one of the most critical decisions in any CNC machining setup. No matter how capable the machine or how well-programmed the toolpath, the final result depends on how securely and accurately the workpiece is held during cutting.

A precision vise is the most common workholding solution on CNC machining centers, milling machines, and grinding machines worldwide. But "a precision vise" is not a single product — it is a category that includes multiple configurations, jaw types, and design variants, each suited to different workpieces, operations, and production requirements.

Choosing the wrong vise for your application leads to problems: poor clamping force, workpiece movement during cutting, excessive setup time, inaccurate parts, and unnecessary wear on both the vise and the machine table. Choosing the right one eliminates these issues and allows you to machine with confidence.

This guide explains how to select the right CNC precision vise based on your machine size, workpiece characteristics, jaw requirements, and production workflow. It covers the full range of GT series precision modular vises manufactured by Zhenghao, including standard vises with interchangeable jaws, quick-change jaw vises, double action dual-station vises, and the ZQ84 two-piece vise for oversized workpieces.

The Foundation: What All Zhenghao GT Precision Vises Have in Common

Before comparing specific vise types, it is worth understanding the shared manufacturing standards that apply across the entire GT series.

All Zhenghao GT precision modular vises are:

• Manufactured from 20CrMnTi alloy steel, selected for its combination of strength, toughness, and hardenability

• Hardened to HRC 58–62 for wear resistance and long-term dimensional stability

• Precision ground to 0.005 mm squareness and parallelism across all critical surfaces

• Designed for use on CNC machining centers, milling machines, grinding machines, and drilling machines

• Available in jaw widths of 100 mm, 125 mm, 150 mm, 175 mm, 200 mm, and 300 mm

• Built with a modular design that allows multiple vises to be mounted side-by-side for multi-part setups

This consistent manufacturing foundation means that regardless of which GT vise variant you select, you are starting from the same baseline of precision and build quality.

Step 1: Select the Right Jaw Width and Clamping Length

The first selection criterion is always the physical size of the vise relative to your machine table and workpiece.

Jaw width (B dimension):

Jaw width determines how much contact area the vise has with the workpiece face. A wider jaw provides more clamping surface, better stability, and higher clamping force distribution.

Clamping length (S max / L dimension):

The clamping length determines the maximum opening of the vise. Zhenghao offers multiple length variants within each jaw width (e.g., GT150A through GT150C), allowing buyers to select the exact clamping range needed without paying for unnecessary travel.

General rule: Select the shortest clamping length that accommodates your largest workpiece. A vise with excessive travel is harder to handle and may introduce unnecessary compliance.

Clamping force:

GT series vises are rated for clamping forces from 3,000 N (GT100) up to 12,000 N (GT300), ensuring adequate holding power for everything from light finishing passes to heavy roughing operations.

Step 2: Choose the Right Vise Type for Your Application

Once you have determined the jaw width and clamping length, the next decision is which vise configuration best suits your workpiece type and production workflow.

Option 1: GT Standard Precision Modular Vise with Interchangeable Jaws

Best for: General-purpose CNC machining, mixed production, applications requiring different jaw types for different workpieces.

The GT standard modular vise is the foundation of the Zhenghao vise range. Its defining feature is the interchangeable jaw system, which allows the operator to swap between different jaw types to suit different workpiece geometries and machining operations — without changing the vise body.

Available jaw types:

A — Flat Jaw

The standard hardened jaw for general-purpose clamping. Ideal for pre-machined surfaces where marring must be avoided. Provides clean, even contact across the full jaw face.

B — Step Jaw

Features precision-machined steps at defined depths, allowing workpieces to be seated at a consistent height without the need for separate parallel blocks. This simplifies setup and improves repeatability.

Step jaw dimensions are consistent across all GT sizes:

Step width is 3 mm across all sizes.

C — Lattice Jaw

Features a diamond-pattern serrated surface that provides aggressive grip on raw, scaly, or hot-rolled stock. Ideal for roughing operations where maximum grip is needed and surface marring is acceptable.

D — Groove Jaw / V-Groove Jaw

Features V-shaped channels for clamping cylindrical parts, shafts, and round bar stock. Prevents rolling and provides secure, centered clamping on round workpieces.

E — Large V-Jaw

A wider V-groove profile for larger diameter cylindrical workpieces where the standard groove jaw does not provide sufficient contact area.

F — Thread Hole Jaw

Features threaded holes that allow soft jaw blanks (typically aluminum) to be bolted on and custom-machined to match the exact profile of a complex or delicate workpiece. Ideal for second-operation work and finishing of precision parts.

G — Elevation Jaw / Square Jaw

A taller jaw profile that raises the workpiece higher above the vise body, providing more clearance for tools to access the sides and bottom of the part. Useful for tall workpieces or operations requiring underside access.

In addition to these standard types, Zhenghao also manufactures custom step jaws and special-profile jaws to customer specifications — useful for dedicated production fixtures where a standard jaw type does not provide the optimal grip geometry.

For straight-jaw applications, Zhenghao also offers a straight jaw design vise variant where the jaw faces are perfectly parallel and perpendicular to the vise body, optimized for applications requiring maximum squareness.

View the full range of interchangeable jaws for GT precision modular vises

Option 2: GT Precision Modular Vise with Quick-Change Jaw System

Best for: High-mix, low-volume production; frequent jaw changeovers; operations requiring multiple jaw types on the same machine in a single shift.

The Quick-Change Jaw vise is Zhenghao's newest addition to the GT series, designed to address one of the most common sources of lost time in CNC workshops: jaw changeover.

In a traditional vise, swapping jaw plates requires unbolting and re-bolting multiple screws — a process that takes several minutes, introduces the risk of chip contamination in threaded holes, and requires careful re-torquing to ensure even clamping. In a busy production environment where jaw types need to change frequently, this time adds up quickly.

Key features:

• Rapid jaw swap in seconds: The quick-change mechanism uses a precision dovetail or wedge-lock system. Jaws slide in and lock securely with a simple wrench turn — no bolts to remove, no chip traps in counterbores.

• Includes aluminum soft jaw set: Each vise comes with a pair of aluminum soft jaws, allowing operators to clamp delicate or soft workpieces without marring, and to machine custom profiles directly into the jaw face for complex part geometries.

• True modular design: The vise body is precision-ground on all sides, allowing multiple units to be mounted side-by-side or end-to-end on the machine table for multi-part setups.

• Anti-lift mechanism: The movable jaw incorporates a pull-down design that actively seats the workpiece against the vise bed as clamping force is applied, preventing upward lifting during heavy cuts.

• Precision: 0.005 mm squareness and parallelism, consistent with the full GT series standard.

Available in GT150×200 and GT150×300 configurations.

View the GT Precision Modular Vise with Quick-Change Jaw System

Option 3: ZQ83 Double Action Precision Vise (Dual-Station Vise)

Best for: High-volume production of identical or similar parts; maximizing parts-per-cycle on VMCs and HMCs; tombstone and pallet fixture setups.

The ZQ83 Double Action Precision Vise is designed around a simple but powerful concept: clamp two workpieces simultaneously in a single vise body, using a single handle operation.

The vise features a fixed center jaw flanked by two independent movable outer jaws. When the lead screw is turned, both outer jaws move inward simultaneously, clamping two parts against the rigid central jaw with equal force. The result is two fully clamped workpieces ready for machining in the time it would normally take to clamp one.

Key features:

• Double productivity: Two parts clamped per cycle means the machine cuts two parts before the operator needs to intervene. This effectively doubles output per spindle hour on repetitive production runs.

• Independent clamping action: The lead screw design allows the vise to clamp two workpieces of slightly different sizes simultaneously, with equal clamping force applied to both — useful for batches where raw material dimensions vary slightly.

• Anti-lift pull-down mechanism: Both movable jaws incorporate an angled pull-down design that seats workpieces firmly against the vise bed as clamping force is applied, preventing lifting during aggressive milling.

• Versatile mounting: Can be mounted horizontally or vertically, and is well-suited for use on 4th-axis tombstones and pallet pool systems.

• Precision: 0.005 mm squareness and parallelism, with slideways flame-hardened for long-term wear resistance.

Available in ZQ83150 and ZQ83150(I) configurations with 150 mm jaw width.

View the ZQ83 Double Action Precision Vise

Option 4: ZQ84 Two-Piece Precision Modular Vise (for Oversized Workpieces)

Best for: Extra-long, extra-wide, or irregularly shaped workpieces that exceed the clamping capacity of standard single-body vises; large castings, long extrusions, oversized plates.

The ZQ84 addresses a fundamental limitation of conventional vise design: the maximum clamping opening is fixed by the length of the vise body. For workpieces that are longer than any standard vise can accommodate, the traditional solution is expensive custom fixturing — which takes time to design, manufacture, and set up.

The ZQ84 solves this problem by separating the vise into two independent sections: a fixed jaw section and a movable jaw section. Because the two sections are not connected by a shared base, they can be positioned at any distance apart on the machine table T-slots, limited only by the travel of the machine itself.

Key features:

• Unlimited clamping capacity: Position the fixed and movable jaw sections as far apart as the machine table allows. This makes the ZQ84 the practical solution for workpieces of any length.

• Heavy-duty construction: Both sections are manufactured from premium 20CrMnTi alloy steel, hardened to HRC 58–62. The thick-walled design absorbs heavy machining vibrations and prevents chatter during high-material-removal operations.

• High clamping force: The movable jaw section uses a heavy-duty lead screw and thrust bearing assembly to generate the immense clamping pressure needed to hold large, heavy parts without slipping.

• Precision ground surfaces: All critical mating surfaces are precision-ground to 0.005 mm, ensuring accurate alignment of large workpieces with the machine axes.

• Multiple sets for extra-long parts: Multiple ZQ84 sets can be used simultaneously along the length of a single workpiece, providing distributed support and clamping for very long or flexible parts.

Available in jaw widths of 100 mm, 125 mm, 150 mm, 175 mm, and 200 mm.

View the ZQ84 Two-Piece Precision Modular Vise

Step 3: Match the Jaw Type to Your Workpiece

Once you have selected the vise body configuration, the final step is ensuring the jaw type is appropriate for your specific workpiece and operation.

Use this quick reference guide:

Step 4: Consider Your Production Workflow

Beyond the workpiece itself, your production workflow should influence the vise selection:

Multi-Station Vise: Expanding Capacity Further

For production environments where maximum throughput is the priority, Zhenghao also offers multi-station vise configurations. By mounting multiple GT modular vise bodies side-by-side on the machine table — made possible by the precision-ground modular design — operators can clamp multiple workpieces in a single setup, dramatically increasing parts-per-cycle without requiring a larger machine.

This approach is particularly effective on horizontal machining centers with pallet systems, where the full machine table can be populated with a grid of vises for unattended batch production.

Why Material and Precision Matter for Vise Selection

All Zhenghao GT series vises share the same material and precision standards, which means the selection decision is primarily about configuration rather than quality compromise. Whether you choose the standard vise, the quick-change variant, the double-action model, or the two-piece ZQ84, you are working with:

• 20CrMnTi alloy steel throughout — the same material used in Zhenghao's CNC tool holders and collets, selected for its strength, hardenability, and long-term dimensional stability

• HRC 58–62 hardness on all wear surfaces

• 0.005 mm squareness and parallelism on all critical ground surfaces

• Monthly production capacity exceeding 800 precision vises, ensuring reliable supply for distributors and OEM buyers

This consistency across the product range simplifies procurement for buyers who need multiple vise types or are building out a complete workholding inventory.

Summary: Vise Selection Decision Guide

Conclusion

Selecting the right CNC precision vise is not simply a matter of choosing the largest or most expensive option. The correct choice depends on a clear understanding of your workpiece geometry, machining operation, production volume, and workflow requirements.

Zhenghao's GT series provides a complete, modular workholding system that covers the full range of CNC machining applications — from general-purpose single-part setups to high-volume dual-station production, from standard flat jaw clamping to complex soft jaw profiling, and from compact parts to oversized workpieces that exceed conventional vise capacity.

All GT series vises are manufactured from 20CrMnTi alloy steel, hardened to HRC 58–62, and precision ground to 0.005 mm, providing the accuracy and durability that precision CNC machining demands.

Explore the full range:

• GT Standard Vise — Interchangeable Jaw Types

• GT Quick-Change Jaw Vise

• ZQ83 Double Action Dual-Station Vise

• ZQ84 Two-Piece Vise for Oversized Workpieces

For bulk orders, OEM inquiries, or custom jaw specifications, contact us at zhjx@pyzhjx.com or +86-18660185316.

FAQ

How do I know which jaw width to choose for my vise?

Select a jaw width that matches or slightly exceeds the contact width of your workpiece. The jaw should provide full, even contact across the clamping face. Using a jaw that is significantly wider than the workpiece wastes clamping force; using one that is too narrow provides insufficient support.

Can I use the same vise body with different jaw types?

Yes. The GT standard modular vise is designed specifically for this purpose. The interchangeable jaw system allows you to swap between flat jaws, step jaws, V-groove jaws, lattice jaws, thread hole jaws, and elevation jaws on the same vise body, adapting to different workpieces without replacing the entire vise.

What is the advantage of the quick-change jaw system over standard interchangeable jaws?

Standard interchangeable jaws require unbolting and re-bolting screws to change jaw plates, which takes several minutes. The quick-change system uses a mechanical locking mechanism that allows jaw plates to be swapped in seconds without tools. This is particularly valuable in high-mix production environments where jaw types need to change frequently throughout the day.

When should I use a double action vise instead of two separate vises?

A double action vise is more compact and simpler to operate than two separate vises when clamping two identical or similar parts. It uses a single lead screw to clamp both parts simultaneously with equal force, reducing setup time and table space. Two separate vises offer more flexibility for parts of very different sizes or when independent clamping control is needed.

What workpieces is the ZQ84 two-piece vise designed for?

The ZQ84 is designed for workpieces that are too long, too wide, or too irregularly shaped to fit within the clamping range of a standard single-body vise. Because the fixed and movable jaw sections are independent, they can be positioned at any distance apart on the machine table, providing clamping capacity limited only by the machine's table travel.

Can Zhenghao manufacture custom jaw profiles?

Yes. In addition to the standard jaw types, Zhenghao manufactures custom step jaws and special-profile jaws to customer specifications. This is useful for dedicated production fixtures where a standard jaw geometry does not provide the optimal grip or positioning for a specific workpiece.