Black Oxide Carbon Steel Special Square Head Bolts for Railway

Name: Black Oxide Carbon Steel Special Square Head Bolts for Railway
Brand: Ningbo Mianxuan Import &Export Co., Ltd.
SKU: 2073605485

Zhejiang, ChinaNingbo Mianxuan Import &Export Co., Ltd.

US$0.88-30.00

100,000 Pieces

Sample price:US$250.00/piece.Request sample

Product profile

Customization

Available

Material

High Strength Steel

Type

Round Head

Model NO.

Square Head Bolt

Connection

Common Bolt

Head Style

Round

Standard

DIN, Non-Standard

Grade

8.8

Finish

Blue-White Zinc Plated

Price

Reasonable Price

Delivery

Quicky Production Time

Reply

Within 48hours

Quality

High Strength

Surface

Zp, HDG, Geomet

Packing

Customized

Transport Package

Small Box, Color Box, PE Bag

Specification

M6, M8, M10, M12, M14, M16

Origin

China

HS Code

7318151001

Production Capacity

500tons/Month

Key features

Wide Material Selection: Available in Stainless Steel, Carbon Steel, Brass, and various alloys for diverse applications.

Customized Surface Finishing: Options include Zinc Plated (Blue, White, Black, Yellow), Nickel Plated, HDG, and Dacromet.

Multiple Thread Standards: Supports UNC, UNF, UEF, UN, UNS, Metric Coarse, and Fine thread specifications.

Fast Response Time: Team provides responses within 2 hours for inquiries and support.

Full Stock Availability: Maintains full stock for almost all standard fasteners to ensure quick delivery.

ISO and GS Certified: Products meet ISO, GS, RoHS, and CE certification standards for quality assurance.

Customized Packaging: Offers bulk, small box, carton, or wooden pallet packaging according to customer requirements.

Professional Quality Control: Equipped with advanced testing equipment and provides inspection reports with every shipment.

Company profile

High Repeat Buyers ChoiceYears of Export ExperienceR&D CapabilitiesODM Services

Ningbo Mianxuan Import &Export Co., Ltd.

Zhejiang, China

Business Type: Manufacturer/FactoryExport Year: 2014-07-01Nearest Port: Ningbo, Zhapu, ShanghaiAverage Response Time: ≤1.92hTerms of Payment: LC, T/T, Western UnionInternational Commercial Terms(Incoterms): FOB, EXW, CFR, CIF

AI-Powered supplier vetting

SummaryNingbo Mianxuan Import & Export Co., Ltd. is identified as a China-based manufacturer/factory offering vehicle parts, CNC machining, stamping, casting, die-casting, fasteners, plastic, and rubber products. It reports TS 16949 and ISO 9001 certifications, more than 10 production lines, 6–10 quality-control staff, and shipment inspection reports with material certificates. The supplier provides 3D software design, ODM, and several customization options, but reports no new products in the past year, no SDK, and no OEM service for popular brands. Service-management documentation is weak: no written procedures or records are reported for assessments, corrective actions, or complaint handling. It has no in-stock capability, overseas warehouse, or overseas showroom. Financial records are indicated for 2023–2025, but their results are not provided, so financial credibility cannot be determined. No customer cases are supplied.

Supplier typeThe supplier is explicitly identified as a manufacturer/factory and limited company in Ningbo, Zhejiang, China. Its stated scope covers fasteners, metal products, machinery, vehicle parts, CNC machining, stamping, casting, die-casting, plastic, and rubber parts, indicating broad manufacturing and industrial-product coverage.

CertificationsThe supplier reports holding TS 16949 and ISO 9001 management-system certifications. It also states that each shipment will include an effective inspection report and corresponding material certificate, providing explicit evidence of documented quality-related controls.

After-Sales capabilityThe supplier reports no written procedures or records for service-capability assessment, corrective and preventive actions, or effective customer-complaint handling. It also lacks in-stock service, overseas warehouse, and overseas showroom capabilities, indicating a documented weakness in after-sales and service infrastructure.

Production capacityThe supplier reports more than 10 production lines, 6–10 quality-control staff, and a product range spanning vehicle parts, CNC machining, stamping, casting, die-casting, fasteners, plastic, and rubber parts. It is located near Ningbo and Shanghai ports and reports 21 qualified suppliers, but has no inventory capability and peak-season lead-time data is inconsistent or unclear.

Customization capabilityThe supplier explicitly offers customization from samples, customization from designs, full customization, minor customization, 3D software design services, and ODM services. These statements provide direct evidence of broad product and design customization capability.

Product Q&A

Q:What international standards do you manufacture hex bolts to?

We produce hex bolts to all major global standards under one roof. This includes DIN 931/933, ISO 4014/4017, ANSI/ASME B18.2.1, BS 916, and JIS B1180. We offer both metric and inch series, covering UNC, UNF, and BSW threads. Custom prints are also welcome.

Q:Can you offer surface finishes that meet European automotive ELV and environmental regulations?

Absolutely. Our eco-friendly finishes are a standard offer. We provide trivalent chromium passivation (Cr3+) zinc plating that is fully ELV-, RoHS-, and REACH-compliant. For extreme corrosion protection, we offer zinc-nickel alloy plating (capable of 720+ hours to red rust in salt spray per ASTM B117) and Cr6-free Dacromet/Geomet coatings.

Q:Is your quality management system IATF 16949 certified for automotive production?

Yes, our manufacturing facility is IATF 16949 and ISO 9001 certified. Our entire quality assurance system, from incoming raw material inspection to final shipment, is designed to meet the sub-PPM (defective Parts Per Million) delivery requirements of automotive OEMs and Tier-1 suppliers. We are also ISO 14001 certified for environmental management.

Q:How do you handle quality complaints or a defective product issue?

We take every quality issue seriously with a structured problem-solving approach. Our team will issue an initial containment within 24 hours, followed by a formal 8D Corrective Action Report within 14 business days, which identifies the root cause and implements permanent corrective actions to prevent recurrence. Your trust and line-down prevention are our top priority.