Views: 0 Author: Nancy Liu Publish Time: 2026-06-26 Origin: Zhenghao Machinery
Item | Details |
Product | GT Series Precision Modular Vise — GT-100 and GT-150A specifications |
Client | Precision manufacturing company, Canada |
Industry | Automotive components · Industrial mold processing |
Equipment | 5-axis machining centers · CNC milling machines |
Precision standard | Parallelism 0.005 mm / 100 mm · Squareness 0.005 mm / 100 mm |
Order quantity | GT-100 × 12 pcs · GT-150A × 8 pcs |
Packaging | Standard export carton + EPE pearl cotton + VCI anti-rust film |
Delivery | Ocean freight · Delivered within 40 days |
Result | Scrap rate: 4% → 0% · Repeat order confirmed |
The client is a precision machining company based in Canada, serving the automotive parts and industrial mold industries — two sectors where dimensional tolerances are measured in microns and where a single out-of-tolerance part can trigger a costly production hold or customer rejection.
Their shop floor runs 5-axis machining centers and CNC milling machines around the clock. In these environments, the workholding fixture is not a passive component — it is an active contributor to part accuracy. Every micron of positioning error introduced by the vise appears directly in the finished part geometry, and in automotive and mold work, there is no tolerance budget to absorb it.
The client had been experiencing a persistent problem with their existing vises: jaw lift. Under clamping force, the movable jaw was lifting slightly — pulling the workpiece upward and away from the vise bed by a small but consistent amount. The result was a 4% scrap rate across their production runs: parts that measured out of tolerance on the first machined face and had to be scrapped before any further value was added.
A 4% scrap rate sounds modest. In precision manufacturing, it is not. It means 4 parts in every 100 are wasted — raw material, machine time, cutting tools, and operator time, all consumed to produce a part that cannot be used. For a shop running multiple machines on multiple shifts, the cumulative cost is substantial.
In May 2026, the client contacted Zhenghao Machinery through Alibaba International Station. Their message was direct:
"We need modular vises for our 5-axis machining centers and CNC mills. Current vises have jaw lift issues causing scrap rate around 4%. Need zero jaw lift design, delivery within 40 days, suitable for ocean freight."
This was not a standard product inquiry. The client was not asking for a price list — they were describing a production problem and asking whether we could solve it. Three requirements were stated explicitly:
Zero jaw lift design — the scrap rate problem had to be resolved, not managed
Delivery within 40 days — a hard deadline tied to a production line expansion
Ocean freight suitable packaging — the products had to arrive in the same condition they left the factory
The Zhenghao technical team's response was not to send a catalogue. It was to ask one question: what is causing the jaw lift in your current vises?
Jaw lift is a mechanical phenomenon that occurs in vises where the movable jaw's clamping geometry allows upward movement as clamping force is applied. When the lead screw is tightened, the force vector in a poorly designed jaw interface has a component that pushes the jaw — and the workpiece — upward rather than purely inward.
The consequences in precision machining are predictable and consistent:
The workpiece is lifted slightly off the vise bed — typically 0.01 mm to 0.05 mm depending on the vise design and clamping force applied
This lift introduces a Z-axis positioning error that is present from the first cut
On a 5-axis machining center, where the program assumes the workpiece is sitting at a precise Z-height, this error propagates through every subsequent operation
Parts that should be within tolerance are consistently out of tolerance — not randomly, but systematically, because the jaw lift is repeatable
The client's 4% scrap rate was not caused by programming errors, tool wear, or material variation. It was caused by a consistent, repeatable positioning error introduced at the clamping stage — before the spindle even started cutting.
The solution was not a process adjustment. It was a vise with a fundamentally different jaw design.
After reviewing the client's application — 5-axis machining centers, automotive and mold work, tight tolerances — the Zhenghao team recommended the GT Series Precision Modular Vise, specifically the GT-100 and GT-150A specifications to match the client's workpiece size range.
The GT Series is Zhenghao's core precision workholding product line, manufactured from 20CrMnTi alloy steel, hardened to HRC 58–62, and precision-ground to 0.005 mm squareness and parallelism on all reference surfaces. It is the product used by precision manufacturers in Germany, the USA, Japan, and now Canada — and it is designed specifically to eliminate the jaw lift problem.
The defining feature of the GT Series movable jaw is its pull-down design. Unlike conventional vise jaws where the clamping force vector has an upward component, the GT Series movable jaw incorporates a precision-engineered angle mechanism in the jaw interface.
When the lead screw is tightened and clamping force is applied, the movable jaw is actively pulled downward — pressing the workpiece firmly against the vise bed rather than lifting it away. The harder you clamp, the more firmly the workpiece is seated. Jaw lift is not reduced — it is mechanically eliminated by the geometry of the design.
For the client's 5-axis machining application, this means:
The workpiece sits at a consistent, accurate Z-height on every clamping — regardless of clamping force variation between operators or between cycles
The Z-axis positioning error that was causing the 4% scrap rate is removed from the process
The 5-axis program runs against a workpiece that is where the program expects it to be
Specification | GT-100 | GT-150A |
Jaw width | 100 mm | 150 mm |
Max opening (Smax) | 100 mm | 200 mm |
Overall length (L) | 270 mm | 420 mm |
Height (H) | 30 mm | 50 mm |
Max clamping force | 3,000 N | 5,000 N |
Parallelism | 0.005 mm / 100 mm | 0.005 mm / 100 mm |
Squareness | 0.005 mm / 100 mm | 0.005 mm / 100 mm |
Repeatability | 0.003 – 0.005 mm | 0.003 – 0.005 mm |
Material | 20CrMnTi alloy steel | 20CrMnTi alloy steel |
Hardness | HRC 58–62 | HRC 58–62 |
Quantity ordered | 12 pcs | 8 pcs |
1 — Pull-down jaw design: zero jaw lift
As described above, the movable jaw geometry actively pulls the workpiece downward under clamping force. This is the direct solution to the client's scrap rate problem.
2 — Fully ground reference surfaces on all six faces
Every GT Series vise body is precision-ground on all six faces to the same 0.005 mm standard. On a 5-axis machining center, the vise is the primary reference for the workpiece coordinate system. A vise body that is not flat, square, and consistent introduces a reference error that the 5-axis program cannot compensate for. The GT Series' fully ground body ensures that the vise itself introduces zero reference error.
3 — Modular interchangeable jaw system
The GT Series supports a full range of interchangeable jaw types — flat jaws, V-groove jaws, step jaws, lattice jaws, thread hole jaws, and elevation jaws — all fitting the same vise body. For a shop handling diverse automotive and mold workpiece geometries, this means one vise platform adapts to every job. View the full range of GT interchangeable jaw types.
4 — High-grade alloy steel at HRC 58–62
20CrMnTi alloy steel provides the combination of surface hardness and core toughness required for precision vise applications. The hardened sliding surfaces resist wear over extended production use, maintaining the vise's precision geometry — and therefore its positioning accuracy — throughout its service life.
The client's 40-day delivery requirement was tied to a scheduled production line expansion. Missing it would mean delaying the expansion and leaving new machines idle — a cost measured in lost production capacity, not just inconvenience.
Zhenghao's standard lead time for GT Series vises, including production, quality inspection, and export packaging, is approximately 30 days for international orders. For this order of 20 units across two specifications, the timeline was confirmed at order placement: production completion in 28 days, ocean freight transit of 10–12 days, total delivery within 38 days.
The order was delivered within 38 days of confirmation — two days ahead of the client's deadline.
The client's packaging requirement was straightforward: ocean freight suitable, no precision surface damage, no rust on arrival. Zhenghao's standard export packaging for GT Series vises is designed to meet exactly this requirement.
Anti-rust treatment:
Each vise received a professional anti-rust oil application to all precision-ground surfaces immediately after final quality inspection. The oil was then sealed with VCI (Volatile Corrosion Inhibitor) anti-rust film wrapping — a packaging material that continuously releases corrosion-inhibiting vapour within the sealed package, protecting metal surfaces from oxidation throughout the transit and storage period.
Inner padding protection:
Each individually wrapped vise was enclosed in EPE pearl cotton padding — a closed-cell foam material that provides consistent, resilient cushioning against vibration and impact loads during ocean freight. Unlike open-cell foam, EPE pearl cotton does not absorb moisture and does not compress permanently under sustained load.
Outer packaging:
The padded units were packed in standard export cartons with clear "FRAGILE" and "THIS SIDE UP" markings on all faces. Carton dimensions were selected to minimise internal movement while maintaining structural integrity under stacking loads.
Pre-shipment quality inspection:
Before packaging, every unit in the batch underwent individual precision measurement — parallelism and squareness verified against the 0.005 mm / 100 mm specification. Only units passing full inspection were packaged and shipped. The inspection records were included in the shipment documentation.
The shipment arrived at the client's Canadian facility within the committed timeline. The client's incoming inspection team opened the cartons and conducted a full goods-in check.
20 vises inspected — zero damage, zero rust
All cartons structurally intact after ocean freight; EPE pearl cotton had absorbed transit vibration without compression failure
All precision surfaces clean and unmarked; VCI film had maintained a rust-free environment throughout transit
The client mounted the GT-100 vises on their 5-axis machining centers and ran the first production batch.
Scrap rate: 4% → 0%
Every part in the first batch fell within tolerance. The jaw lift that had been systematically introducing a Z-axis positioning error into every part was gone — eliminated by the pull-down jaw geometry of the GT Series movable jaw.
The client's feedback, received within two weeks of delivery:
"20 vises inspected upon unboxing — no damage, no rust. After testing the GT-100 on our machines, the first batch of machined parts all fell within tolerance. Scrap rate dropped from 4% to 0%. We're confirming a repeat order for the second production line next quarter."
A 4% scrap rate in precision manufacturing is not just a quality metric — it is a direct cost. For every 100 parts produced:
4 parts consume raw material, machine time, cutting tools, and operator time
4 parts generate no revenue and cannot be recovered
4 parts require replacement production, consuming additional capacity
Eliminating this scrap rate means that the same machines, the same operators, and the same raw material now produce 4% more usable parts per shift — permanently, for every shift the GT Series vises are in use. The return on the vise investment is measured in weeks, not months.
The client's inquiry described a symptom — 4% scrap rate — not a product specification. The Zhenghao response was to identify the root cause (jaw lift) before recommending a product. This diagnostic approach is what allowed us to recommend the GT Series with confidence that it would solve the problem, rather than simply offering a product that might be suitable.
A supplier that responds to "we have a scrap rate problem" with a price list is not solving the problem. A supplier that identifies jaw lift as the cause and recommends a pull-down jaw design is.
The client did not confirm a repeat order because the vises arrived on time and undamaged — though both of those things matter. They confirmed a repeat order because the vises eliminated a production problem that had been costing them money every day. The 0% scrap rate is a measurable, documented result that justifies the purchasing decision to every stakeholder in the client's organisation.
This is the difference between a transaction and a partnership. Zhenghao's goal in every export order is not to ship a product — it is to deliver a result.
This case also demonstrates that premium custom packaging is not always necessary. The client's requirement — ocean freight suitable, no damage, no rust — was met by Zhenghao's standard export packaging: VCI anti-rust film, EPE pearl cotton padding, and correctly marked export cartons. The packaging was not over-engineered or under-engineered. It was correctly matched to the product, the transit route, and the client's requirements.
For clients with more demanding packaging requirements — long-term warehouse storage, high-humidity routes, or multi-specification bulk orders — Zhenghao also offers custom fumigation solid wood crate packaging with dedicated internal inserts, as used in our QGG precision grinding vise export to the UK.
The GT-100 and GT-150A used in this case are two specifications within Zhenghao's full GT Series range. The complete range covers jaw widths from 100 mm to 300 mm, with multiple clamping length options within each jaw width:
Model | Jaw Width | Max Opening | Clamping Force |
GT100 | 100 mm | 100 mm | 3,000 N |
GT125 | 125 mm | 150 mm | 3,000 N |
GT150A–C | 150 mm | 200–400 mm | 5,000 N |
GT175A–E | 175 mm | 200–600 mm | 6,000 N |
GT200A–E | 200 mm | 200–600 mm | 10,000 N |
GT300A–G | 300 mm | 200–800 mm | 12,000 N |
All specifications share the same manufacturing standard: 20CrMnTi alloy steel · HRC 58–62 · 0.005 mm parallelism and squareness · pull-down anti-lift jaw mechanism.
For high-mix production environments requiring rapid jaw changeover, the GT Quick-Change Jaw Vise provides the same precision standard with a tool-free jaw swap mechanism — changing jaw types in under 10 seconds without removing any bolts.
For high-volume production requiring maximum parts per cycle, the ZQ83 Double Action Dual-Station Vise clamps two workpieces simultaneously with a single lead screw operation, doubling output from the same machine and operator.
If your CNC operation is dealing with any of the following, the GT Series may be the direct solution:
✅ Scrap rate caused by inconsistent part positioning — jaw lift or movable jaw movement during clamping
✅ Dimensional variation between parts in the same batch — repeatability issues from the workholding fixture
✅ 5-axis or multi-axis machining requiring a vise body that is a true, consistent reference on all faces
✅ Mold or automotive work where tolerances leave no room for fixture-introduced error
✅ Production line expansion with a defined delivery timeline for new workholding equipment
✅ Ocean freight delivery requiring packaging that protects precision surfaces over long transit distances
Contact Zhenghao to discuss your specific requirements. We will identify the root cause of your workholding challenge before recommending a product — the same approach that delivered a 4% → 0% scrap rate result for this Canadian client.
Email: zhjx@pyzhjx.com
Phone / WhatsApp: +86-18660185316
Website: www.pyzhjx.com
Jaw lift occurs when the movable jaw of a vise moves upward as clamping force is applied, lifting the workpiece away from the vise bed. This introduces a Z-axis positioning error that is present from the first cut. In precision machining — particularly on 5-axis machining centers where the program assumes an exact workpiece Z-height — even 0.01–0.03 mm of jaw lift produces consistent dimensional errors across every part in the batch, resulting in scrap.
The GT Series movable jaw incorporates a precision-engineered angle mechanism in the jaw interface. When clamping force is applied via the lead screw, the geometry of this interface actively pulls the movable jaw downward, pressing the workpiece against the vise bed. The harder the clamping force, the more firmly the workpiece is seated. Jaw lift is mechanically eliminated — not reduced, but eliminated — by the design geometry.
Yes. The GT Series is specifically suited to 5-axis machining applications. All six faces of the vise body are precision-ground to 0.005 mm squareness and parallelism, providing a true reference surface for workpiece coordinate system setup. The pull-down jaw design ensures consistent Z-height positioning across all parts in a batch, which is critical for 5-axis programs where the tool approaches the workpiece from multiple angles.
For standard GT Series specifications, Zhenghao's production and inspection lead time is approximately 25–30 days. Ocean freight transit to North American ports typically adds 10–15 days. Total delivery time from order confirmation to arrival is typically 35–45 days, depending on the destination port and customs clearance. The Canadian client in this case received delivery within 38 days of order confirmation.
Yes. For clients who want to evaluate the GT Series on their machines before committing to a full order, sample quantities can be arranged. Contact us to discuss sample order terms and specifications.
The GT Series supports a full range of interchangeable jaw types: flat jaws, step jaws, V-groove jaws, lattice / serrated jaws, thread hole jaws (for soft jaw installation), and elevation jaws. All jaw types are interchangeable on the same GT vise body. View the complete GT interchangeable jaw range for full details.
