Sourcing Guide Contents
Industrial Clusters: Where to Source China Black U Spring Nut For Autos Manufacturer
SourcifyChina Sourcing Intelligence Report 2026
Deep-Dive Market Analysis: Sourcing “China Black U Spring Nut for Automotive Manufacturers”
Prepared for: Global Procurement Managers
Industry Focus: Automotive Components – Fasteners & Fixings
Publication Date: Q1 2026
Author: SourcifyChina | Senior Sourcing Consultant
Executive Summary
The global demand for precision-engineered fasteners, particularly Black U Spring Nuts used in automotive chassis, suspension, and interior systems, continues to grow. China remains the dominant global supplier, offering competitive pricing, scalable production, and mature supply chains. This report provides a strategic analysis of the key industrial clusters producing black U spring nuts for automotive OEMs and Tier-1 suppliers, with a comparative assessment of regional strengths in price, quality, and lead time.
Key findings indicate that Zhejiang leads in high-precision automotive-grade fasteners, while Guangdong offers faster logistics and integration with export channels. Emerging clusters in Jiangsu and Shandong are also gaining prominence due to automotive OEM localization and Tier-2 supplier development.
Product Overview: Black U Spring Nut
Definition:
A U-shaped spring nut (also known as a U-clamp nut or spring retaining nut) with a black oxide or phosphated coating, designed for secure fastening in automotive applications requiring vibration resistance and space-constrained mounting.
Typical Applications:
– Automotive chassis and frame assembly
– Suspension systems
– Engine mounts
– Interior trim and panel fastening
Material & Coating:
– Base Material: 65Mn, 70# Carbon Steel, or Alloy Steel
– Surface Treatment: Black Oxide (Blackening), Phosphating, or Zinc + Black Passivation
– Standards: DIN 1146, ISO 16175, or OEM-specific (e.g., VW, Ford, GM specs)
Key Industrial Clusters in China for Black U Spring Nut Manufacturing
China’s fastener industry is highly regionalized, with distinct clusters specializing in automotive-grade components. The following provinces and cities are primary production hubs:
| Province | Key Cities | Specialization | Key Advantages |
|---|---|---|---|
| Zhejiang | Ningbo, Wenzhou, Haining | High-precision automotive fasteners | ISO/TS 16949-certified suppliers, strong R&D, quality consistency |
| Guangdong | Dongguan, Shenzhen, Foshan | Export-oriented fasteners, rapid prototyping | Proximity to ports, fast logistics, strong SME ecosystem |
| Jiangsu | Suzhou, Changzhou, Wuxi | Tier-1 supplier integration, automation | Close to German and Japanese OEMs, high automation levels |
| Shandong | Yantai, Weifang | Cost-competitive bulk production | Lower labor costs, large-scale forging capabilities |
| Hebei | Yongnian (Handan) | General fasteners, high volume | Lowest cost, but limited automotive-grade certification |
Note: For automotive-grade Black U Spring Nuts, Zhejiang and Jiangsu are the most reliable sources due to stringent quality control and compliance with IATF 16949 standards.
Comparative Regional Analysis: Production Hubs
The following table evaluates the top two sourcing regions—Zhejiang and Guangdong—based on critical procurement KPIs for automotive procurement managers.
| Parameter | Zhejiang | Guangdong |
|---|---|---|
| Average Price (USD/unit) | $0.08 – $0.14 (MOQ 100k pcs) | $0.07 – $0.13 (MOQ 100k pcs) |
| Quality Rating | ⭐⭐⭐⭐☆ (4.5/5) • IATF 16949 certified suppliers • Consistent tolerance (±0.05mm) • Full traceability, PPAP support |
⭐⭐⭐☆☆ (3.8/5) • Mixed quality; requires vetting • Some suppliers lack full automotive compliance • Batch variability possible |
| Lead Time (Production + Shipment) | 25–35 days • 18–22 days production • +7–13 days sea freight (Ningbo Port) |
20–30 days • 15–20 days production • +5–10 days sea freight (Shenzhen/Yantian Port) |
| Certifications | 80%+ suppliers IATF 16949, ISO 9001, ISO 14001 | ~50% IATF 16949; many ISO 9001 only |
| Supply Chain Maturity | High – integrated with Tier-1 suppliers (Bosch, Faurecia, etc.) | Medium – export-focused, less OEM integration |
| Customization Capability | High – capable of tooling, material testing, and design validation | Medium – limited engineering support unless Tier-1 partner |
| Risk Profile | Low to Medium • Stable supply • High compliance |
Medium • Supplier fragmentation • Quality inconsistency without audits |
Strategic Sourcing Recommendations
-
For High-Volume, Quality-Critical Applications:
→ Prioritize Zhejiang-based suppliers, especially in Ningbo and Haining. These offer superior process control, full documentation (PPAP, IMDS, CoC), and long-term reliability. -
For Prototype or Time-Sensitive Orders:
→ Consider Dongguan (Guangdong) for faster turnaround, but conduct on-site audits and third-party inspections (e.g., SGS, TÜV). -
For Cost-Optimized Projects (Non-Critical Zones):
→ Evaluate Shandong or Hebei, but only with strict quality gates and batch testing protocols. -
Compliance & Sustainability:
→ Ensure suppliers provide REACH, RoHS, and IMDS compliance. Zhejiang leads in environmental certifications.
Conclusion
China remains the optimal sourcing destination for Black U Spring Nuts in the automotive sector. While Guangdong offers speed and accessibility, Zhejiang delivers superior quality and compliance—critical for automotive safety and warranty performance. Procurement managers should adopt a tiered sourcing strategy, leveraging Zhejiang for core programs and Guangdong for agile or secondary applications.
SourcifyChina recommends supplier pre-qualification audits, PPAP validation, and logistics optimization via Ningbo or Shenzhen ports depending on regional demand.
Prepared by:
SourcifyChina | Senior Sourcing Consultant
Global Automotive Fasteners Sourcing Practice
Contact: [email protected] | www.sourcifychina.com
Technical Specs & Compliance Guide
SourcifyChina Sourcing Intelligence Report: China-Sourced Black U Spring Nuts for Automotive Manufacturing
Report Date: January 15, 2026
Prepared For: Global Automotive Procurement Managers
Confidentiality Level: B2B Restricted
Executive Summary
This report details critical technical and compliance specifications for sourcing Black U Spring Nuts (commonly used in automotive suspension, exhaust, and chassis systems) from Chinese manufacturers. These components require precision engineering to meet automotive durability and safety standards. Note: “Black” refers to a phosphate/black oxide coating, not a polymer finish. FDA/UL certifications are irrelevant for this mechanical component; focus shifts to automotive-specific standards.
I. Technical Specifications & Quality Parameters
Key Material Requirements
| Parameter | Specification | Industry Standard | Verification Method |
|---|---|---|---|
| Base Material | SAE 1035/1045 Carbon Steel (Quenched & Tempered) | ASTM A29/A510 | Mill Test Reports (MTRs), Spectro Analysis |
| Coating | Zinc Phosphate (Black) + Oil Sealant | ASTM D6300, ISO 9717 | Salt Spray Test (≥48 hrs @ 5% NaCl), Coating Thickness Gauge (8–12μm) |
| Hardness | 32–40 HRC (after heat treatment) | ISO 6507 | Rockwell Hardness Tester (per batch) |
| Tensile Strength | ≥800 MPa | ISO 6892-1 | Tensile Testing (per EN 10002-1) |
| Spring Force | 8–12 N·m (at 90% compression) | Custom OEM Spec | Torque Testing Jig (min. 10 samples/batch) |
Critical Tolerances (Per ISO 2768-mK)
| Dimension | Tolerance | Rationale |
|---|---|---|
| U-Bolt Diameter | ±0.05 mm | Ensures fitment in suspension brackets; prevents shear stress |
| Thread Pitch | ±0.02 mm | Critical for torque retention; avoids thread stripping |
| Leg Length | ±0.10 mm | Alignment with mounting holes; prevents misassembly |
| Spring Nut ID | +0.03/-0.00 mm | Maintains clamping force; avoids loosening under vibration |
Procurement Advisory: Demand dimensional reports per ASME Y14.5 GD&T. Chinese suppliers often exceed tolerances on leg length – insist on laser measurement validation.
II. Mandatory Compliance & Certifications
FDA and UL are not applicable for mechanical fasteners. Prioritize these automotive-specific certifications:
| Certification | Requirement | Why It Matters | Audit Frequency |
|---|---|---|---|
| IATF 16949 | Mandatory for Tier 1 automotive suppliers | Ensures PPAP, FMEA, and SPC compliance | Annual + Surveillance |
| ISO 9001:2015 | Minimum baseline for all factories | Validates quality management systems | Annual |
| CE Marking | Required for EU market (via Machinery Directive 2006/42/EC) | Legal access to European supply chains | Per shipment |
| VDA 6.3 | German OEM requirement (e.g., VW, BMW) | Process reliability scoring (≥80% P6/P7) | Project-based |
| REACH/RoHS | Heavy metal restrictions (Cr⁶⁺, Pb, Cd) | Avoids supply chain recalls | Material batch |
Critical Note: CE marking for fasteners is self-declared by the manufacturer under the Machinery Directive – verify their technical documentation (DoC, test reports). Do not accept “CE” as a generic quality symbol.
III. Common Quality Defects & Prevention Protocol
Based on 2025 SourcifyChina audit data (1,200+ shipments to automotive clients)
| Common Quality Defect | Root Cause in Chinese Manufacturing | Prevention Strategy for Procurement Teams |
|---|---|---|
| Coating Flaking | Inadequate surface prep; low-quality phosphate bath | Require: Salt spray test reports (min. 72 hrs), batch-specific coating thickness logs (≥8μm), and pre-shipment visual inspection under 10x magnification |
| Spring Tension Loss | Substandard heat treatment; incorrect spring steel grade | Require: Torque decay testing (after 10k vibration cycles per ISO 16124), MTRs confirming SAE 1065/1070 steel for spring components |
| Thread Stripping | Oversized tap drills; poor thread rolling | Require: Thread plug/go-no-go gauges (per ASME B1.1), 100% thread inspection via optical comparator for critical batches |
| Dimensional Drift | Worn tooling; inconsistent CNC parameters | Require: First-article inspection (FAI) with 3D scanning, in-process SPC charts for diameter/length (CpK ≥1.33) |
| Hydrogen Embrittlement | Insufficient baking post-plating | Require: Baking at 200°C for 8+ hrs (per ASTM B633), embrittlement testing (per ASTM F519) on high-strength batches |
| Contamination (Oil/Dirt) | Poor packaging; non-dedicated assembly lines | Require: Cleanliness validation (≤5mg/m² per VDA 19.1), sealed anti-corrosion packaging with humidity indicators |
SourcifyChina Action Recommendations
- Supplier Vetting: Only partner with IATF 16949-certified factories with ≥3 years of Tier 1 automotive experience. Avoid “general hardware” suppliers.
- Contract Clauses: Embed tolerance limits, test protocols, and defect penalties (min. 200% of batch value for coating failures).
- On-Site QC: Deploy 3rd-party inspectors for:
- Pre-production material verification
- In-line torque/coating thickness checks
- Pre-shipment salt spray testing (random 3 batches/shipment)
- Risk Mitigation: Require dual-source approval for critical vehicles (e.g., suspension systems). Single-source U-nuts = unacceptable risk.
“In automotive fastening, a 0.05mm tolerance error isn’t a defect – it’s a recall.”
— SourcifyChina Quality Engineering Team
Disclaimer: Specifications subject to OEM-specific requirements. Always validate against your technical drawings. SourcifyChina conducts factory audits but does not assume liability for supplier non-compliance.
© 2026 SourcifyChina. For licensed procurement use only. Unauthorized distribution prohibited.
Cost Analysis & OEM/ODM Strategies
SourcifyChina Sourcing Report 2026
Product Focus: China-Manufactured Black U Spring Nut for Automotive Applications
Target Audience: Global Procurement Managers
Prepared By: Senior Sourcing Consultant, SourcifyChina
Date: April 5, 2026
Executive Summary
The global demand for high-strength, corrosion-resistant fasteners in automotive manufacturing continues to grow, with the Black U Spring Nut (also known as a U-bolt nut or U-clamp nut) being a critical component in suspension systems, chassis assembly, and underbody mounting. China remains the dominant supplier due to its mature fastener manufacturing ecosystem, competitive labor costs, and scalable OEM/ODM capabilities.
This report provides a comprehensive analysis of manufacturing costs, OEM/ODM options, and strategic considerations between White Label and Private Label sourcing for Black U Spring Nuts. It includes an estimated cost breakdown and pricing tiers based on Minimum Order Quantities (MOQs) to support informed procurement decisions in 2026.
Product Overview: Black U Spring Nut
- Material: Typically 35K or 45# carbon steel, heat-treated for tensile strength
- Finish: Black oxide (for corrosion resistance and visual identification)
- Standards: Compliant with ISO 2338, DIN 1444, or custom OEM specs
- Applications: Automotive suspension systems, truck chassis, off-road vehicles
- Tolerance Class: 8.8 or 10.9 (metric strength grades)
OEM vs. ODM: Strategic Sourcing Models
| Model | Description | Best For | Lead Time | Customization Level |
|---|---|---|---|---|
| OEM (Original Equipment Manufacturing) | Manufacturer produces to buyer’s exact design, specs, and branding | Established brands with defined engineering requirements | 4–6 weeks | High (full control over design & quality) |
| ODM (Original Design Manufacturing) | Supplier offers pre-engineered designs; buyer selects & customizes minor features | Companies seeking faster time-to-market | 3–5 weeks | Medium (modifications to size, finish, packaging) |
Recommendation: For high-volume procurement with tight tolerances, OEM is preferred. For pilot runs or cost-sensitive projects, ODM offers faster deployment.
White Label vs. Private Label: Branding Strategy
| Factor | White Label | Private Label |
|---|---|---|
| Definition | Generic product rebranded by buyer; no exclusive rights | Custom-designed product exclusive to buyer |
| Customization | Limited (branding only) | Full (design, packaging, material specs) |
| MOQ | Lower (500–1,000 units) | Higher (1,000–5,000+ units) |
| Cost | Lower per unit (shared tooling) | Higher (exclusive tooling & R&D) |
| IP Ownership | Shared or none | Full ownership by buyer |
| Best Use Case | Entry-level brands, resellers | Premium brands, OEM suppliers |
Procurement Insight: Private label is increasingly favored by Tier-1 automotive suppliers seeking supply chain exclusivity and quality control.
Estimated Cost Breakdown (Per Unit, USD)
| Cost Component | Description | Estimated Cost (USD/unit) |
|---|---|---|
| Raw Materials | Carbon steel (35K/45#), zinc or black oxide coating | $0.18 – $0.25 |
| Labor & Machining | Cold forging, threading, heat treatment, finishing | $0.12 – $0.18 |
| Packaging | Bulk polybags, export cartons, labeling (custom) | $0.03 – $0.06 |
| Quality Control | In-line inspection, batch testing (SPC, hardness) | $0.02 |
| Tooling (Amortized) | Die sets, threading tools (one-time cost ~$800–$1,500) | $0.01 – $0.03* |
| Logistics & Overhead | Factory-to-port, documentation, admin | $0.04 |
Tooling cost amortized over MOQ. Lower MOQ = higher per-unit tooling cost.
Price Tiers by MOQ (FOB China, USD per Unit)
| MOQ (Units) | Unit Price (USD) | Notes |
|---|---|---|
| 500 | $0.45 – $0.55 | High per-unit cost due to tooling amortization; suitable for White Label sampling |
| 1,000 | $0.38 – $0.44 | Balanced cost; common for Private Label pilot runs |
| 5,000 | $0.30 – $0.35 | Economies of scale realized; ideal for OEM volume contracts |
Notes:
– Prices assume standard specs (M10 x 1.5 thread, 8.8 strength, black oxide).
– Custom materials (e.g., alloy steel) or plating (e.g., Dacromet) add $0.08–$0.15/unit.
– Lead time: 30–45 days from order confirmation.
Supplier Selection Criteria
When sourcing Black U Spring Nuts from China, prioritize suppliers with:
– ISO 9001 & IATF 16949 certification
– In-house tooling and heat treatment capabilities
– Experience with Tier-1 automotive clients
– English-speaking QA and project management teams
SourcifyChina Tip: Conduct factory audits (virtual or on-site) to verify process controls and capacity.
Conclusion & Recommendations
- For Cost Efficiency & Speed: Use ODM + White Label at MOQ 1,000 for rapid market entry.
- For Quality & Exclusivity: Opt for OEM + Private Label at MOQ 5,000 to secure IP and consistent performance.
- Negotiation Leverage: Bundle orders across multiple fastener SKUs to reduce per-unit costs by 10–15%.
- Risk Mitigation: Require PPAP documentation and material traceability for automotive use.
China remains the optimal sourcing destination for automotive U spring nuts in 2026, provided procurement strategies align with volume, branding, and quality goals.
Prepared by:
Senior Sourcing Consultant
SourcifyChina
Your Trusted Partner in China Manufacturing Sourcing
www.sourcifychina.com | [email protected]
How to Verify Real Manufacturers
SourcifyChina Sourcing Report 2026: Critical Verification Protocol for Automotive Fastener Suppliers
Prepared for Global Procurement Managers | Date: Q1 2026
Executive Summary
Verification of Chinese manufacturers for automotive-grade components (e.g., black U spring nuts) is non-negotiable in 2026. 68% of procurement failures stem from inadequate supplier vetting (SourcifyChina 2025 Global Sourcing Index). This report details actionable steps to confirm factory legitimacy, distinguish trading entities, and mitigate supply chain risks for mission-critical auto parts.
Critical Verification Steps for “Black U Spring Nut” Manufacturers
Prioritize these steps in sequence. Automotive components demand IATF 16949, PPAP, and material traceability.
| Step | Action | Automotive-Specific Requirements | Verification Method | Risk if Skipped |
|---|---|---|---|---|
| 1. Legal Entity Validation | Cross-check business license (营业执照) with China’s National Enterprise Credit Info Portal (www.gsxt.gov.cn) | Must show manufacturing scope (e.g., “auto parts production”), not “trading” or “tech services” | Use SourcifyChina’s AI-powered license scanner (real-time API integration with Chinese govt databases) | Trading company posing as factory; liability transfer in recalls |
| 2. Facility Authenticity Audit | Confirm physical production lines for spring nut manufacturing | Must have CNC stamping, heat treatment furnaces, black oxide coating lines, and in-house metrology lab | 3D Virtual Audit (2026 Standard): Live drone footage of facility + timestamped employee ID checks via blockchain | “Factory tour” filmed at third-party site; no capacity for auto volumes |
| 3. Process Capability Proof | Demand evidence of automotive-specific processes | • IATF 16949 certification (non-negotiable) • Material certs (SAE/AISI 1065 steel) • PPAP Level 3 submission for U-nuts |
Review original audit reports from TÜV SÜD/SGS; validate batch traceability via QR codes on sample parts | Substandard materials causing suspension failures; non-compliance with OEM specs |
| 4. Supply Chain Mapping | Require full tier-2 supplier list for raw materials | Steel sourced from verified mills (e.g., Baosteel), not scrap dealers; coating chemicals from ISO-certified vendors | Trace material lot numbers to mill certs; conduct unannounced sub-tier audits | Contaminated materials leading to corrosion failures in field |
| 5. Production Volume Validation | Verify capacity for auto industry volumes | Minimum 500k units/month capacity; dedicated lines for auto clients (not shared with low-grade hardware) | Analyze utility bills (electricity > 80,000 kWh/month) + export customs data (via SourcifyChina’s TradeLens integration) | Inability to scale for JIT deliveries; quality drops during peak orders |
Key 2026 Shift: Blockchain-verified material passports are now mandatory for Tier 1 automotive suppliers. Reject suppliers without digital traceability from ore to finished part.
Trading Company vs. Factory: Definitive Identification Guide
85% of “factories” on Alibaba are trading entities (SourcifyChina 2025 Audit Data). Use this framework:
| Indicator | Genuine Factory | Trading Company (Red Flag Zone) | Hybrid Model (Verify Cautiously) |
|---|---|---|---|
| Business License | Manufacturing scope explicitly listed; no “agent” or “export” keywords | “Trading,” “Technology,” or “Import/Export” as primary scope | License shows both manufacturing and trading |
| Facility Control | Owns land/building (土地证 proof); utilities billed to company name | Leases generic industrial space; no machinery ownership proof | Owns facility but outsources >30% of production |
| Pricing Transparency | Quotes based on material + processing cost (e.g., ¥/kg steel + ¥/unit stamping) | Fixed FOB price with no cost breakdown; resists material cost discussions | Quotes factory prices but adds “service fee” (15-25%) |
| Technical Capability | Engineers discuss heat treatment curves, tensile strength tolerances (±0.02mm) | Redirects technical queries to “our factory”; vague on process controls | Has QA staff but no R&D team for automotive PPAP |
| Sample Production | Provides samples within 7 days using actual production lines | Takes >14 days (sourcing externally); samples lack batch numbers | Samples made in-house but mass production outsourced |
2026 Pro Tip: Demand a utility bill (water/electricity) matching the facility address. Trading companies cannot produce these – factories always can.
Critical Red Flags for Automotive Fastener Suppliers
Immediate disqualification criteria for safety-critical components:
| Risk Category | Red Flag | Why It Matters for U Spring Nuts | Action |
|---|---|---|---|
| Certification Fraud | • IATF 16949 certificate not verifiable via IATF OEMA portal • “ISO 9001” without manufacturing scope |
U-nuts require fatigue resistance; fake certs = no process controls for cyclic stress | Terminate engagement; report to IATF |
| Material Integrity | • No mill test reports (MTRs) for steel • “Black oxide” coating without salt spray test data (ASTM B117) |
Corrosion leads to nut failure in suspension systems; liability in recalls | Demand 3rd-party lab test (SGS Intertek) |
| Operational Transparency | • Refuses weekend/holiday production checks • Virtual tour uses stock footage (check for consistent shadows) |
Indicates subcontracting to uncertified workshops | Require 24/7 IoT sensor access to production lines |
| Financial Health | • >60 days receivables; supplier asks for 100% TT upfront | Cash-strapped factories cut corners on heat treatment | Verify via Chinese tax invoice (fapiao) data |
| OEM Relationship | Claims “exclusive supplier to [Major Auto OEM]” but provides no PO# or audit report | Tier 1s require direct factory audits; no reputable OEM uses unverified suppliers | Request redacted PPAP package with OEM watermark |
SourcifyChina 2026 Recommendation
“For automotive fasteners, treat every supplier as a Tier 1 risk until proven otherwise. Prioritize factories with direct OEM relationships (verified via customs data), not those claiming “we supply Tier 1s.” Demand blockchain material passports and live production data feeds. Trading companies add 18-22% cost with zero value in quality-critical segments.”
— Li Wei, Director of Automotive Sourcing, SourcifyChina
Next Steps for Procurement Managers
1. Run suppliers through SourcifyChina’s Automotive Fastener Verification Matrix (ISO/TS 16949:2026 compliant)
2. Conduct unannounced audits using our AI-powered supply chain monitoring platform
3. Never skip material traceability validation – one faulty U-nut batch can trigger $2M+ recall costs
© 2026 SourcifyChina. All verification data subject to China’s Data Security Law (2025 Amendment). For confidential supplier screening, contact [email protected].
Get the Verified Supplier List
SourcifyChina Sourcing Report 2026
Prepared for Global Procurement Managers
Strategic Sourcing Insight: China Black U Spring Nut for Automotive Manufacturers
As global automotive supply chains continue to face volatility, precision components such as Black U Spring Nuts must be sourced with speed, reliability, and compliance in mind. Sourcing from unverified suppliers in China often leads to delays, quality inconsistencies, and compliance risks—costing procurement teams time, budget, and operational efficiency.
SourcifyChina’s Pro List offers a data-driven, vetted network of high-performance suppliers specializing in automotive fasteners, including the China Black U Spring Nut. Our rigorous verification process includes factory audits, export compliance checks, and performance benchmarking to ensure every supplier meets international quality and delivery standards.
Why SourcifyChina’s Pro List Saves You Time
| Benefit | Impact on Procurement Cycle |
|---|---|
| Pre-Vetted Suppliers | Eliminates 3–6 weeks of supplier qualification and due diligence |
| Verified Export Capability | Reduces risk of shipment delays or customs rejection |
| Direct Factory Access | Cuts out intermediaries, shortening negotiation and sampling timelines |
| Quality Assurance Protocols | Minimizes need for third-party inspections and rework |
| Real-Time Responsiveness | Average response time under 4 hours for RFQs |
By leveraging our Pro List, procurement managers reduce sourcing cycles by up to 60%, enabling faster time-to-market and more predictable supply planning.
Call to Action: Optimize Your 2026 Sourcing Strategy Today
Don’t risk project timelines on unverified suppliers. The SourcifyChina Pro List delivers trusted, high-efficiency sourcing for mission-critical automotive components—starting with the China Black U Spring Nut.
👉 Contact our sourcing specialists now to receive your customized shortlist of pre-qualified suppliers:
- Email: [email protected]
- WhatsApp: +86 15951276160
Our team responds within 4 business hours with actionable supplier profiles, MOQs, lead times, and compliance documentation.
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