Engineered to ISO 9001 / IATF 16949 Standards for Extreme Mechanical Reliability
VLC is a leading bolts and screws manufacturer in China. With about 20 years of expertise in fasteners production and technology, we have an annual output of 10,000 tons of bolts, studs, screws, and custom structural components—specializing in hex bolts, structural bolts, weld studs, and high-tensile threaded fasteners.
Our factory leader started the first personally owned business in 2006, driven by a steadfast mission: becoming customers’ first choice for industrial fastener manufacturing worldwide. Today, VLC operates state-of-the-art manufacturing hubs featuring multi-station cold heading machines, precision CNC lathes, automatic screw cutters, and comprehensive heat treatment lines.
Lathe Process Unit
CNC Machinery Workshop
High-Speed Screw Machine
Automatic Lathes Production Line
Automated Inspection & Secondary Processing Division
Analyzing the Macro Shift Towards Lightweight Structural Joining and High-Torque Resistance Welding Solutions
The global industrial fasteners market is undergoing a fundamental technological transformation. Driven by the rapid growth of Electric Vehicle (EV) manufacturing, lightweight aerospace architectures, renewable energy infrastructure, and automated modular construction, demand for high-integrity OEM/ODM Welded Fasteners has escalated dramatically. Welded fasteners—encompassing projection weld studs, spot weld nuts, drawn-arc stud fasteners, and capacitor discharge (CD) weld components—provide permanent, tamper-proof, and extremely high-shear mechanical joints that traditional mechanical clamping simply cannot match.
Resistance projection welding nuts and studs are critical for electric vehicle battery enclosures, subframe assemblies, and BIW structural panels where vibration resistance and automated robot feeding are mandatory.
Heavy-duty structural studs welded to galvanized solar racking and wind turbine internal housings guarantee zero movement under dynamic hurricane-force wind loads and thermal cycles.
Surface Mount Technology (SMT) solderable standoffs and capacitor discharge weld pins enable high-density PCB mounting within micro-enclosures without reverse-side markation.
Traditional threaded mechanical fasteners rely solely on friction created by tightening torque. Under severe cyclic loading, harmonic vibration, or thermal expansion, bolted joints can experience self-loosening and catastrophic fatigue failure. In contrast, weld fasteners fuse directly into the parent sheet metal or structural substrate, creating a continuous metallurgical bond. The weld zone routinely exhibits tensile and shear strength exceeding that of the fastener shank itself.
E-E-A-T Rigor: Comprehensive Technical Specifications & Material Compliance
As a certified OEM/ODM exporter, VLC strictly adheres to international engineering frameworks including DIN 928, DIN 929, ISO 13918, AWS D1.1, and ASTM A325/A490. Selectivity in chemical composition determines weld pool viscosity, electrical resistivity, and post-weld joint micro-hardness.
| Material Grade | Chemical Composition Highlights | Tensile Strength (MPa) | Primary Application Scenario | Weldability Index |
|---|---|---|---|---|
| Low Carbon Steel (C1008 - C1018) | C: 0.08–0.18%, Mn: 0.30–0.60% | 400 – 550 | General automotive body panels, stamped brackets | Excellent (Standard Resistance) |
| High-Tensile Alloy (Grade 8.8 / 10.9) | Cr-Mo / Boron alloyed, quenched & tempered | 800 – 1040 | Heavy structural machinery, conveyor tensioners | High (Requires Preheat/Controlled Current) |
| Stainless Steel (SS304 / SS316L) | Cr: 18-20%, Ni: 8-12%, Mo (316L): 2-3% | 550 – 750 | Marine fittings, chemical processing, medical enclosures | Superior (CD & Drawn Arc) |
| Titanium Alloy (Gr5 / Ti-6Al-4V) | Al: 5.5-6.75%, V: 3.5-4.5% | ≥ 895 | Aerospace structural mounts, high-end motorsport | Specialized (Inert Gas Shielded) |
| Brass & Copper Alloys (C28000 / C11000) | Cu: 60-99.9%, Zn Balance | 300 – 450 | Electrical earthing rods, busbar grounding, PCB SMT | Excellent (Thermal/SMT Soldering) |
Successful projection welding requires precise geometry of the weld nibs (projections). VLC’s engineering department utilizes finite element simulation to optimize projection volume, ensuring clean current concentration without metal expulsion or excessive flash. Our proprietary tooling ensures:
From FEA Simulation to Automated Optical Sorting and Global Freight Delivery
Step/IGES model review, FEA stress modeling, material yield optimization, and projection design selection.
In-house die production, multi-station cold heading, high-speed thread rolling, and CNC secondary turning.
Continuous mesh belt heat treatment, DACROMET, GEOMET, Zinc-Nickel plating with 1500hr salt spray resistance.
100% laser vision sorting for dimensional tolerances up to 50 PPM, guaranteeing zero line jams on robotic assembly lines.
Field-Proven Solutions across Critical Industrial Environments Worldwide
Challenge: An international automotive OEM required high-strength, leak-proof threaded anchor points on 1.5mm aluminum-alloy battery trays. Standard nuts caused galvanic corrosion and sealing failures.
VLC OEM Solution: Developed custom stainless steel (SS316L) projection weld studs with an anti-rotation knurled flange and specialized sealing rim. Coupled with automated capacitor discharge welding, cycle times were reduced by 40% while achieving IP68 fluid isolation.
Challenge: Mining conveyor operations in Western Australia experienced frequent splice failures using conventional mechanical belt clips under high dynamic tension.
VLC OEM Solution: Precision cold-forged High-Strength V6 Carbon Steel Conveyor Belt Fasteners. Engineered with high yield strength carbon steel (Grade 10.9 equivalent) and micro-alloyed heat treatment, extending continuous belt operating life by over 300% in abrasive conditions.
Innovating Next-Generation Smart Fastening Systems for Industry 4.0
Embedding piezo-resistive thin-film strain gauges directly into weld stud shanks for real-time clamping force telemetry in critical infrastructure and wind turbines.
Replacing steel fasteners with customized Grade 5 Titanium (Ti-6Al-4V) studs in aerospace and high-end automotive, cutting structural mass by up to 45% without sacrificing yield strength.
Transitioning all surface finish lines to chromium-free, waterborne zinc flake coatings capable of exceeding 2,000 hours of neutral salt spray testing (ISO 9227).
In-Depth Answers to Technical Purchasing, Engineering & Manufacturing Queries
Full Range Manufacturing Capabilities for Automotive, Appliance, and Marine Applications
VLC Part
