Automotive Bolts — OEM & Aftermarket Supply from a Certified Manufacturer
From custom OEM bolt programs to aftermarket stock supply, CNXD delivers precision-engineered automotive bolts in grades 4.8–12.9, backed by 30+ years of manufacturing and full PPAP documentation.
CNXD is a professional automotive fastener manufacturer with over 30 years of production experience. We supply automotive bolts to OEM car factories, aftermarket distributors, and fastener wholesalers across 30+ countries — covering standard fasteners, custom OEM parts, and aftermarket replacement hardware with full traceability and PPAP documentation.
Automotive Bolt Types We Manufacture
Precision-manufactured bolts for critical vehicle systems — wheel-end, suspension, engine, and structural assemblies — in strength grades from 4.8 to 12.9.
Hex Bolts
DIN 931 / DIN 933 / ASME B18.2.1 compliant. Carbon steel, alloy steel, and stainless steel for chassis, body, and powertrain connections. Zinc plating, Dacromet, and black oxide finishes.
View Hex Bolts →
Flange Bolts
DIN 6921 / DIN 34801 specifications. Class 10.9 and 12.9. Integrated flange distributes load without separate washers — ideal for exhaust manifolds, transmission housings, and suspension brackets.
View Flange Bolts →Wheel Bolts / Lug Bolts
Conical seat and ball seat lug bolts for European, Asian, and American platforms. Torque-tested and hardness-verified. OEM number cross-referencing for BMW, Audi, VW, and Mercedes-Benz.
View Wheel Bolts →
Stud Bolts
Double-ended threaded fasteners for flange systems, exhaust assemblies, and turbocharger connections. Grades 8.8, 10.9, and 12.9 with application-matched surface treatments.
View Stud Bolts →
T Bolts
T-head and hammer bolts for aluminum profile assembly, mold slot connections, and industrial fixture mounting. Available in stainless steel 304/316 and carbon steel with zinc plating, in sizes M4–M12 and custom lengths.
View T Bolts →
Cylinder Head Bolts
Engineered for high-temperature, high-pressure sealing with calibrated preload across thermal cycles. TTY and reusable designs with tight tolerance thread geometry control.
View Head Bolts →Additional Bolt Types Available
Allen bolts, weld bolts, plow bolts, shoulder bolts, seat belt bolts, and connecting rod bolts. Custom configurations from drawings, samples, or OE reference numbers.
Materials, Grades & Surface Treatments
Every automotive bolt we ship is material-traceable and process-controlled. Our engineering team recommends the optimal combination based on your application.
| Parameter | Available Options |
|---|---|
| Carbon Steel | Grade 8.8 / 10.9 / 12.9 |
| Alloy Steel | SCM435, 40Cr |
| Stainless Steel | SS304, SS316 |
| Specialty Alloys | Duplex stainless steel, titanium, nickel alloys |
| Surface Coatings | Zinc plating, HDG, Dacromet, black oxide, phosphate, geomet |
| Thread (Metric) | M3 – M30 |
| Thread (Inch) | 1/4" – 1" |
| Diameter | Φ3 mm – 30 mm |
| Custom | Non-standard sizes, coatings, and grades on request |
OEM Custom Bolt Manufacturing
CNXD is not a catalog-only supplier. We operate as an engineering partner for automotive bolt programs — from your first drawing to mass production.
Start from Drawing, Sample, or OE Number
We handle mold design, prototyping, and specification validation.
In-House Testing Laboratory
Torque, hardness (Rockwell/Vickers), tensile, salt spray, and metallographic analysis.
Full OEM Documentation
PPAP Level III, FMEA, material certificates, and inspection reports — every batch.
Proven OEM Track Record
Programs delivered for Audi, Hongqi, FAW, Eaton, and more.
OEM Project Workflow
Submit drawing, sample, or OE number
Engineering review & quotation (2–3 days)
Mold design & sample production (25–30 days)
Sample approval & PPAP documentation
Mass production & quality-controlled delivery
Certifications & Quality Control
Our entire production process is certified to IATF 16949, ensuring zero-tolerance quality control on every fastener. In-house laboratory capabilities cover hardness testing, tensile strength verification, torque testing, salt spray testing, metallographic analysis, and dimensional inspection. We support both 100% inspection and AQL sampling based on customer requirements. Learn more about CNXD →
Aftermarket & Stock Bolt Programs
For aftermarket distributors and auto parts wholesalers, CNXD maintains ready stock on high-demand bolt SKUs — including wheel lug bolts, camber bolts, and common hex bolt specifications.
Why Source Automotive Bolts from CNXD?
30+ Years Manufacturing Heritage
A family-owned manufacturer since 1996 with proven OEM programs for Daimler, Audi, and Eaton. Three decades of production systems and quality controls behind every bolt.
Full Vertical Integration
Mold design, raw material sourcing, cold heading, heat treatment, surface coating, and packaging — all within our 33,000 m² facility. No outsourcing. Complete traceability.
30,000+ Fastener Database
Our proprietary database covers 30,000+ bolt variants with vehicle-specific fitment records. Send an OEM number — we cross-reference and recommend the right part fast.
OEM + Aftermarket, One Source
Whether you need 500,000 custom bolts for an OEM line or 1,000 pieces of aftermarket wheel bolts for a distributor — same quality-controlled production system.
Automotive-Grade Quality Systems
IATF 16949 certification, PPAP Level III, FMEA analysis, and in-house lab testing. We ship parts with the documentation your quality team expects.
Global Export Experience
Serving 30+ countries with established logistics for US, Europe, South America, Russia, Japan, Korea, and SE Asia. Multilingual support in 6 languages.
Frequently Asked Questions
Are you a manufacturer or a trading company?
CNXD is 100% manufacturing. We own and operate dedicated production facilities with over 30 years of experience in the fastener industry, supported by in-house testing laboratories for OEM and quality requirements.
What types of automotive bolts can you manufacture?
We manufacture hex bolts, flange bolts, wheel bolts (lug bolts), stud bolts, suspension bolts (including camber bolts), cylinder head bolts, allen bolts, weld bolts, T-bolts, plow bolts, shoulder bolts, seat belt bolts, and connecting rod bolts.
What strength grades do you support?
We produce automotive bolts from Grade 4.8 through Grade 12.9 and support custom material specifications. Common grades include 8.8, 10.9, and 12.9 in carbon steel and alloy steel. Learn more in our bolt grade comparison guide.
What is the MOQ for custom automotive bolts?
For aftermarket standard bolts, MOQ starts at 1,000 pieces per SKU. For OEM custom bolts, MOQ depends on specific dimensions and tooling requirements — contact us with your specifications for an accurate quote.
Do you provide PPAP and FMEA documentation?
Yes. We hold IATF 16949 certification and routinely provide PPAP Level III documentation and FMEA analysis for OEM projects.
What information do you need to start a custom bolt project?
We can start from a technical drawing, physical sample, OE/OEM part number, or vehicle model and application details. Our engineering team will review and provide a quotation with specs, pricing, and lead time.
Do you accept mixed orders or trial orders?
What are your main export markets?
Our main markets include the United States, Mexico, South America, Europe (Germany, France, UK, Italy), Russia, Thailand, South Korea, and Japan. We ship 20+ million bolts per year internationally.
How fast can you respond to a quotation request?
We typically respond within 24 hours on standard products. For custom or OEM projects, expect a detailed quotation within 2–3 business days.
What surface coatings are available for your bolts?
We offer zinc plating, hot-dip galvanizing, Dacromet, black oxide, phosphate coating, and geomet.
Ready to Source Automotive Bolts?
Whether you need a quotation, technical consultation, or product samples — our team is ready to help.
Looking for Reliable Automotive Fasteners?
CNXD provides one-stop OEM fastener solutions — from design to mass production — covering bolts, nuts, washers, and circlips.
Our 33,000㎡ automated factory, 50+ testing devices, and IATF 16949 quality system guarantee durability, accuracy, and fast turnaround.
Share your project details — we’ll prepare a tailored quote and technical advice.
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