Wujiang DingLong Metal Hardware Products Co., Ltd. is located in Pingwang Town, Wujiang District of Suzhou City. Our company is a production-oriented enterprise integrating product development, production, and sales.
Our products mainly involve flanges, bolts, screws, standard hardware parts, auto parts, electronic fasteners, 5G communication products, etc.
We adhere to a philosophy of meticulousness, excellence, and sincere service, with a sustainable business approach. We aim to provide customers with the most precise and high-quality fastener products such as flanges, bolts, and screws, along with professional technical support.
We believe in win-win cooperation and are committed to establishing long-term strategic partnerships to achieve the best interests of both parties.
Founded in Pingwang Town, Wujiang District of Suzhou City, DingLong Hardware is a fully integrated manufacturer of precision fasteners — stud bolts, flange bolts, hexagonal screws, threaded rods and specialty fasteners — serving procurement engineers and sourcing managers across Germany, Southeast Asia, and beyond.
DEFECT RATE (OQC)
DingLong is a production-based fastener manufacturer in Wujiang, Suzhou, integrating R&D, cold forging, CNC threading, heat treatment, surface coating, and quality inspection in-house. We manufacture and verify every fastener at our own facility, supplying stud bolts, flange bolts, hex screws, threaded rods, nuts, washers, and custom fasteners for rail, telecom, automotive, and construction industries.
| Established | 2003 |
| Location | Pingwang, Wujiang, Suzhou |
| Factory Area | 15,000 m² |
| Employees | 200+ |
| Product Range | M3 – M72 · Grade 4.8 – 12.9 |
| Certifications | ISO 9001:2015 · IATF 16949 |
| Export Markets | DE · MY · TH · VN · ID · SG · NL |
| Annual Capacity | 8,000+ metric tons |
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Measurable claims — not marketing language.
DingLong manufactures every fastener in-house at our Wujiang facility. No subcontracting, no re-labelling from third-party mills. Buyers receive direct factory pricing, full raw-material-to-finished-part traceability, and unrestricted third-party inspection access.
Thread pitch tolerance held to ISO Class 6H/6g. All critical dimensions verified on Zeiss CMM and calibrated digital thread gauges. Concentricity ≤0.05 mm for high-speed rail and automotive applications. FAI reports issued as standard documentation.
Every shipment includes EN 10204 Type 3.1 MTR, Certificate of Conformance, RoHS/REACH declaration, and dimensional inspection report. PPAP Level 3 packages for automotive OEM customers. All documents issued digitally within 24 hours of request.
Incoming material chemistry (OES spectrometer), in-process SPC monitoring with Cpk ≥1.33 target, 100% final inspection at AQL 1.0. Defect rate maintained below 300 PPM. SGS, TÜV, and buyer-nominated inspector visits facilitated at any production stage.
Zinc plating · Hot-dip galvanizing ISO 1461 · Dacromet ≥720 h salt spray · Geomet ≥1,000 h · Delta-Tone / Delta-Seal · Nickel plating · Mechanical zinc. All RoHS-compliant, no Cr(VI). Coating thickness verified per ASTM B499.
Custom drawings treated as confidential; NDA signed before any technical exchange. Buyer-paid tooling locked exclusively to that account. Stable supply backed by long-term agreements with major Jiangsu steel rod mills, insulating against spot-market shortages.
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DingLong fasteners are engineered for the compliance and precision demands of four critical sectors.
Stud bolts, hex flange bolts and track-fastening screws for ICE, CRH and KTX rail lines. Compliant with TB/T 1231 and EN 14399-4. Full material traceability from raw material certificate to final inspection report.
Stud Bolts →
Stainless (A4-70/A4-80) and HDG stud bolts, hex socket screws and spring gasket sets for base station antenna mounts, outdoor enclosures and tower assemblies. Pre-kitted sets available per tower zone.
5G Solutions →
Grade 10.9/12.9 hex socket cap screws, flange bolts and countersunk bolts with Dacromet/Geomet coating. IATF 16949 QMS, PPAP Level 3, FMEA and Cpk ≥1.67 reporting available on request.
Automotive Solutions →
CE-marked structural bolting assemblies per EN 14399 (preloading) and EN 15048 (non-preloading), HDG anchor bolts, expansion screws and fully threaded rods for concrete and steel structure applications.
Standard Solutions →
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Full documentation packages provided with every order. Certificates available for download upon request.
Quality Management System covering design, production, inspection and delivery
Automotive QMS. PPAP, APQP, FMEA and control plans per automotive supply chain
Third-party factory audits and per-shipment inspection reports on request
EU Directive 2011/65/EU. No Pb, Cd, Hg, Cr(VI). All coatings verified compliant
Substances of Very High Concern declaration updated per ECHA candidate list
EN 14399 (preloading) and EN 15048 (non-preloading) structural bolt assemblies
Material Test Reports co-signed by accredited laboratory. Heat and batch traceable
DIN 931/933/976, ISO 4014/4017, ASTM A193/A307 and other applicable standards
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Primary export markets and the buyer profiles we serve.
Automotive Tier-1/2, machinery OEM, civil engineering. DIN/CE compliance, TÜV inspection, German-language documentation supported.
5G telecom contractors, construction projects, industrial equipment assembly. Fast lead times via direct freight from Suzhou.
Manufacturing plant construction, automotive assembly expansion, infrastructure projects. RoHS-compliant supply for factory compliance.
High-speed rail KTX and Shinkansen infrastructure. Strict dimensional tolerance requirements; CMM-verified FAI reports provided as standard.
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Technical and commercial questions from our global procurement partners.
Our Philosophy
DingLong’s operating principle is simple: deliver exactly what the drawing specifies, document everything, and stand behind the parts with third-party verification. We do not compete on price alone — we compete on the total cost of ownership for procurement teams who cannot afford field failures caused by out-of-spec fasteners.
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