Est. 1995 · ISO 9001 · CE Certified · 80+ Countries
The World Builds
Its Ducts With
SBKJ Machines.
Every spiral tubeformer, auto duct line and fitting machine is engineered to your production capacity — not assembled from a parts catalog. One manufacturer. Every machine your factory needs.
- 0+
- Years Manufacturing
- 0+
- Countries Served
- 0+
- Machines Installed
- 0+
- Active Patents
- 24/7
- Technical Support
- 0 mo
- Standard Warranty
The SBKJ Difference
Not a Machine Seller.
A Factory Builder.
Most suppliers ship you a machine and leave the integration to you. SBKJ designs your entire production line — layout, machine selection, automation level, commissioning — then supports it for the machine's lifetime.
Complete Production Range
Spiral tubeformers, rectangular auto duct lines, gorelockers, TDF flange formers, lockformers, plasma cutters, seam welders — every machine in your factory from a single manufacturer. No integration gaps. No mismatched specs.
- 9 machine categories, 50+ models in production
- One technical contact for your entire line
- Matched specifications and tolerances across machines
Turn-Key Factory Design
We engineer your factory floor before a machine ships. 3D layout, material flow analysis, utility requirements, maintenance access zones — then we commission every machine on-site and certify your operators.
- 3D factory layout and material flow planning
- On-site installation supervision by SBKJ engineers
- Full operator and maintenance team training
Patent-Protected Engineering
60+ active patents. Our flying slitter mechanism, closed-loop CNC length control, and hydraulic notching systems are proprietary — not rebadged commodity components found in competing machines.
- Patented flying slitter — no production stop at cut
- Closed-loop CNC holds ±0.5 mm across full runs
- Hydraulic precision notching on rectangular lines
Lifetime Production Partnership
Our support system doesn't end at delivery. Remote diagnostics within 72 hours, original tooling and consumables shipped worldwide, preventive maintenance schedules, and lifetime spare parts availability.
- 72-hour remote fault diagnosis commitment
- Original spare parts — worldwide shipping
- Lifetime spare parts availability guaranteed
Production Economics
What Automation Costs — and What It Returns
Capital equipment decisions require hard numbers. Here is how SBKJ auto duct lines perform against manual production at typical commercial HVAC factory scale.
Up to 7× output increase.
An SBAL‑V running at 2,000 m²/day replaces the combined output of 6–8 manual bays while cutting labor requirements by 75%. At current commercial duct fabrication rates across the markets we serve, most customers recover their machine investment within 12–24 months of reaching full production capacity.
Discuss Your Factory's ROI →Engineering Depth
30 Years of Precision.
60+ Patents Protecting It.
Founded in Jiangyin, Jiangsu — in China's precision manufacturing heartland on the Yangtze River Delta — SBKJ's engineering team has spent three decades refining what happens at the moment metal becomes duct.
Our machines are not assembled from commodity components. Core forming mechanisms, control systems, and tooling are developed and manufactured in-house, protected by 60+ active patents. Each machine leaves our factory against a documented inspection protocol.
Our Engineering Story →Patented Flying Slitter
Cuts spiral duct at full strip speed without stopping the line — eliminating the cycle-time penalty of indexed cutting. Proprietary mechanism on the SBTF‑1602.
Closed-Loop CNC Control
Servo-driven length measurement with real-time feedback on every auto duct line. Enter dimensions once — the machine holds ±0.5 mm across an entire production run.
Multi-Material Tooling
Galvanized steel, stainless steel and aluminum on the same machine. Engineered for the material mixes real factories run — not laboratory conditions.
ISO 9001 Process Control
Every machine passes a documented pre-shipment inspection: dimensional accuracy, electrical integrity, motion performance. Signed off before loading.
Product Range
Every Machine Your Duct Factory Needs
50+ models across 9 categories. From coil uncoiling to finished duct — single source, matched specifications, one support team.
Auto Duct Line SBAL‑V
U‑shape automatic line · 800–2,500 m²/day
Auto Duct Line SBAL‑III
Hydraulic notching & shearing · ~1,000 m²/shift
Spiral Tubeformer SBTF‑1602
Φ80–Φ1600 mm · Patented flying shear
Spiral Tubeformer SBTF‑1500
Φ80–Φ1500 mm · Saw blade cutting
Gorelocker SBEM‑1250
Hydraulic elbow machine · 100–1,250 mm
TDF Flange Forming
Transverse duct flange · SBTDF‑12 / 1.5‑16
Lockformer (SBLC Series)
Pittsburgh lock & cleat forming
Seam Closing SBHF‑I
Duct zipper · 15 m/min closing speed
Manufacturing Scale
Built at Scale in Jiangyin.
Delivered to Spec Worldwide.
Our factory is in Jiangyin, Jiangsu — one of China's premier precision manufacturing regions, 80 km from Shanghai port. Ten dedicated production lines. 30 years of continuous investment in tooling, process control, and R&D.
Dedicated assembly lines for spiral tubeformers, auto duct lines, and auxiliary machines — enabling concurrent production without lead time compromise.
Machines operating on 6 continents across commercial HVAC, industrial ventilation, metro infrastructure, cold chain, and data center applications.
Three decades of R&D documented in active patent filings covering forming mechanics, CNC automation systems, and material handling.
CE marked and ISO 9001 certified. Every machine passes a documented pre-shipment inspection covering dimensional accuracy, electrical integrity, and motion performance.
Installed in
After-Sales System
We Stay With You
After the Machine Ships.
A machine that goes down costs you production. Our after-sales infrastructure is built to minimize that risk — with documented response times, not policy statements.
On-Site Commissioning
Our engineers travel to your factory for installation supervision and production trial runs. Delivery is not complete until your line is running at rated capacity.
Operator & Maintenance Training
Structured training for operators and maintenance staff. Documented procedures for daily operation, scheduled maintenance, and common fault response.
72-Hour Remote Diagnostics
When a fault occurs, our technical team diagnoses remotely via video and machine data. Most faults are identified and resolved without a field visit — within 72 hours of first contact.
Lifetime Spare Parts
Original tooling, forming rolls, control components, and consumables available for the life of your machine. Stocked for fast international shipping — no substitutes.
Machines in Operation
See the Production Line Running
Every machine shown is in active production use. No trade show demonstrations — factory floor footage only.
Start Here
Tell Us Your Production Target.
We'll Engineer the Line.
Share your material type, target daily output, and available floor space. Our engineers will respond with a machine configuration, factory layout proposal, and investment range — at no cost.
For buyers ready to specify and price a machine order.
For technical questions, feasibility checks, or a quick capacity estimate.