Joint function
Clamp, seal, locate, conduct, isolate or enable service removal before selecting the fastener family.
Automotive & New Energy Vehicles
High-Performance Fastening Solutions for Automotive & New Energy Vehicles (EV)
Empowering global automotive supply chains with zero-defect, lightweight, and high-fatigue-resistant fastening components. IATF 16949 certified manufacturing matching global OEM standards.
Core Application Scenarios & Targeted Products
Fastening Challenges We Overcome
Assembly behavior
Connect fastener geometry, mating material, coating friction, locking method and tightening process.
Validation evidence
Specify traceability, dimensions, coating, friction data, mechanical tests and PPAP where the joint requires them.
Powertrain & Chassis Systems
Fastening Challenge We Overcome
Vibration Resistance
Vehicles are constantly exposed to dynamic loads and severe vibration. Fasteners must maintain precise clamping force throughout the product lifecycle to prevent loosening.
Engineered for joints under continuous high-frequency vibration, extreme thermal cycling, and heavy dynamic loads.
Technical Focus: High tensile strength, strict torque-tension repeatability, and zero tolerance for hydrogen embrittlement.
Fastening system logic
Powertrain and chassis joints are preload-driven systems: bolt strength, bearing area, coating friction, nut or washer pairing and tightening method must work together under vibration, heat and road shock.
Joint function: Maintain clamp load in engine, transmission, suspension and wheel-end joints while resisting fatigue, loosening, gasket relaxation and corrosion after installation.
Recommended fastening system
- Cylinder Head Bolts + controlled lubrication for gasket compression and torque-angle tightening.
- Connecting Rod Bolts / Flywheel Bolts in SCM435 or 42CrMo for compact fatigue-critical assemblies.
- Hex Flange Bolts + lock nuts or disc spring washers for chassis brackets, subframes and wheel-end joints.
- Double End Studs where housings or mounts require repeated service without damaging the base thread.
Selection checks
- Grade 10.9 / 12.9 must be checked together with joint stiffness, ductility and hydrogen embrittlement risk.
- Phosphate, black oxide, zinc flake or zinc nickel should be selected by friction coefficient and corrosion class.
- Wheel-end and chassis assemblies should confirm seating geometry, thread engagement and loosening resistance.
Validation evidence
Common risk: Using a generic high-strength bolt without controlling surface friction can pass tensile testing but still miss the required clamp load in assembly.
Recommended product families
50CrV4 Disc Spring Washers
Grade 10 Nylon Insert Lock Nuts
10.9 Grade Wheel Bolts
SCM435 Phosphate Double End Stud Set
SCM435 Flywheel Bolts
42CrMo Connecting Rod Bolts
65Mn Spring Hose Clamps for Coolant & Fuel Lines
42CrMo Cylinder Head Bolts
SCM435 10.9 Black Oxide Partial-Thread Hex Bolt Set
SCM435 10.9 Grade Hex Flange BoltsEV Battery Packs & E-Mobility
Fastening Challenge We Overcome
Lightweight Design
Automotive manufacturers actively seek lightweight materials and optimized fastening systems to improve fuel efficiency and extend EV driving range.
Lightweight, sealed structural connections for EV battery enclosures, trays, and drive units.
Technical Focus: Superior corrosion resistance, precise thread pitch diameter for perfect sealing, cleanroom packaging options, and galvanic corrosion prevention.
Fastening system logic
EV battery pack fastening is a mixed-material sealing system: the fastener has to control gasket compression, galvanic corrosion, service removal and electrical or thermal interface risk.
Joint function: Join battery trays, covers, underbody enclosures, brackets, busbar supports and thermal-management components while keeping sealing and corrosion behavior stable over service life.
Recommended fastening system
- Full Thread Hex Head Bolts or Hex Flange Bolts with zinc flake or zinc nickel for tray and cover joints.
- Stainless Flat Washers / Lock Washers where bearing surfaces need corrosion resistance.
- Stainless nuts or lock nuts for exposed fastening points and serviceable assemblies.
- Titanium Bolts only for weight-sensitive or galvanic-compatible special joints where cost is justified.
Selection checks
- Do not choose stainless automatically; coated alloy steel may provide better strength, friction control and cost.
- Check aluminum, coated steel and stainless combinations for galvanic corrosion and bearing pressure.
- For serviceable joints, confirm repeat assembly torque and thread damage risk.
Validation evidence
Common risk: Choosing only by corrosion resistance can create problems in galvanic compatibility, thread strength, sealing compression or assembly repeatability.
Recommended product families
Body-in-White & Structural Frame
Fastening Challenge We Overcome
Corrosion Protection
Exposure to road salt, moisture, and extreme weather requires advanced engineering coatings to achieve 1000+ hours salt spray resistance.
Robust, reusable internal threads for thin-sheet assembly without heat distortion or weld spatter.
Technical Focus: Perfect dimensional tolerance for automated robotic assembly lines, high twist-out and push-out torque resistance.
Fastening system logic
BIW fastening is a thin-sheet and automated-assembly system: thread creation, projection welding, robotic feeding, e-coat compatibility and repeatability matter more than raw bolt strength.
Joint function: Create reliable threaded points and bracket attachments in sheet metal without weld distortion, thread contamination, low push-out strength or assembly-line downtime.
Recommended fastening system
- Square Weld Nuts / Hex Weld Nuts for permanent internal threads in sheet-metal structures.
- Hex Flange Nuts for wider bearing area and fast automated assembly.
- Self Drilling Screws where drilling and fastening are combined in bracket or light sheet-metal joints.
- Pan Head Self Tapping Screws for light-gauge sheet and non-critical bracket fastening.
Selection checks
- Weld nuts should be checked for projection geometry, weld quality, torque resistance and thread cleanliness after coating.
- Self drilling and self tapping screws must match sheet thickness, pilot condition and installation speed.
- Automated feeding reliability and mixed-part prevention should be treated as quality requirements.
Validation evidence
Common risk: A vague label like automotive screw is not enough; head style, thread form, sheet thickness and installation method decide whether the joint works.
Recommended product families
Automotive Interiors & Trim
Fastening Challenge We Overcome
Safety Compliance
Critical vehicle components must comply with strict automotive quality standards, achieving an absolute zero-defect target.
Precision micro fasteners for vibration-resistant, squeak-free interior and trim assemblies.
Technical Focus: Low driving torque, high stripping torque, and anti-loosening features.
Fastening system logic
Interior fastening is a plastic and NVH system: the screw profile, boss geometry, drive torque window and serviceability decide whether the joint strips, rattles or survives rework.
Joint function: Fasten plastic bosses, trim brackets, covers and serviceable modules with enough retention while avoiding boss cracking, stripped threads, squeak-and-rattle issues and visible damage.
Recommended fastening system
- Plastic Thread Forming Screws in case-hardened steel for polymer bosses and housings.
- Pan Head Screws where bearing area is needed without a countersunk seat.
- Captive or special screws where repeated service access is expected.
- Small washers or locking features where vibration or plastic creep affects the joint.
Selection checks
- Choose thread profile by plastic material, boss diameter, engagement length and installation torque.
- Confirm drive torque to strip torque ratio, pull-out strength and boss cracking risk.
- For service parts, check whether the screw can be removed and reinstalled without losing retention.
Validation evidence
Common risk: Replacing plastic thread forming screws with ordinary self tapping screws can damage boss material even if the screw size appears similar.
Recommended product families
Zero-Defect Quality Control Matching IATF 16949 Standards
ISO 9001IATF 16949RoHSREACH
- Full Traceability: Complete raw material heat number traceability from initial steel wire/bar to the final packaged pallets.
- 100% Automated Optical Sorting: High-speed optical sorting to ensure zero dimensional mix-ups and eliminate PPM defects on automated assembly lines.
- Torque-Tension Testing: Specialized labs to verify friction coefficient (μ value control) and clamp load for robotic tightening.
- Extreme Corrosion Resistance: Salt spray testing verifying coating lifespans up to 1000+ hours without red rust for Zinc-flake, Zinc-Nickel, and Geomet coatings.
- Full PPAP Support: Complete Production Part Approval Process (PPAP Level 3) documents provided for automotive OEM audit.
Engineering Service & VAVE Support
We don't just supply standard parts; we actively optimize your fastening assembly to reduce total cost of ownership:
- Co-Design Support — Send us your 3D CAD files or prints. Our engineering team will optimize fastener geometry for cold heading, significantly reducing raw material waste and unit costs compared to turning.
- Anti-Galling & Anti-Loosening Solutions — Pre-applied micro-encapsulated thread lockers (e.g., precote, Loctite) or anti-galling wax coatings for stainless steel fasteners to guarantee seamless field installation.