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Premium Steel Solutions for Global Industries

Ningbo Chenglong Special Steel Co., Ltd. – trusted supplier of high-quality alloy steel, carbon steel, bright bars, and precision fasteners since 1992. Over 200,000 tons sold annually.

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About Ningbo Chenglong

Ningbo Chenglong Special Steel Co., Ltd. was established in 1992 and specializes in selling products from famous domestic special steel companies. After more than ten years of hard work, it has developed into a sales and distribution center integrating warehousing, processing, and inspection.

We have established long-term and stable relationships with leading enterprises in plastic machinery, auto and motorcycle parts, hardware, and other industries across China and abroad. Our annual sales exceed 200,000 tons of special steel products.

Located at No. 625, Zhenning East Road, Zhenhai District, Ningbo City, Zhejiang Province, our facility supports a robust supply chain with efficient logistics and quality assurance.

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Ningbo Chenglong Factory

Our Impact

20+
Years In Service
6,000+
Customers Served
200,000+
Annual Sales (Tons)
300+
Employees

Our Products

High-quality threaded rods, bolts, nuts, washers, bright bars, and more — engineered for durability, precision, and performance.

Thread Rod

Thread Rod

  • Diameter: M8 - M100
  • Length: 16mm - 6000mm
  • Material: Alloy, Carbon, Stainless Steel
  • Standards: DIN975, A193, BS, JIS
  • Surface: Galvanized, Black, Bright
Stud Bolt

Stud Bolt

  • Grades: 4.8, 8.8, 10.9, B7, L7
  • Standards: A193, DIN931, DIN933
  • Surface: Teflon, Dacromet, Heat Treated
  • Diameter: 1/4" - 53/4"
  • Monthly Capacity: 1500 tons
Hex Bolt

Hex Bolt

  • Standard: DIN933, A325, A325M
  • Material: Alloy & Carbon Steel
  • Surface: Teflon (PTFE), Galvanized
  • High temp & corrosion resistance
  • Easy disassembly & maintenance
Nut

Nut

  • Grade: 4, 8, 10, B7
  • Standard: DIN934, A194
  • Material: Alloy & Carbon Steel
  • Surface: Black, Bright, Dacromet
  • High tensile strength
Washers

Washers

  • Flat & Spring Washers
  • Material: Carbon Steel
  • Surface: Galvanized, Phosphated
  • Standards: DIN125, DIN126
  • Uniform load distribution
Bright Bar

Bright Bar

  • Material: Alloy & Carbon Steel
  • Surface: Bright, Cold Drawn
  • Precision dimensional control
  • Used in automotive & machinery
  • Excellent machinability
Screw

Screw

  • Machine & Structural Screws
  • Material: Carbon & Alloy Steel
  • Surface: Zinc, Teflon, Dacromet
  • Standards: DIN, ISO, ANSI
  • High durability & precision
Pin

Pin

  • Cotter, Clevis, Dowel Pins
  • Material: Carbon & Alloy Steel
  • Heat treated for strength
  • Used in mechanical linkages
  • Precision fit & alignment
View Full Product Catalog

Why Choose NBC Long Steel?

We combine decades of expertise with advanced processing and strict quality control to deliver reliable steel solutions worldwide.

Industrial Expertise

Over 20 years of experience in special steel distribution, serving plastic machinery, automotive, and hardware industries.

Quality Assurance

Rigorous inspection processes and compliance with international standards ensure every product meets the highest benchmarks.

Fast Delivery

Efficient logistics and a monthly production capacity of 1,500 tons ensure delivery within 2–4 weeks after order confirmation.

Latest News

Stay updated with company developments, events, and industry insights.

Teflon Hex Bolt

Teflon (PTFE) Hexagon Bolts

Teflon-coated bolts offer exceptional corrosion resistance, high-temperature stability, and anti-adhesion properties. Ideal for harsh chemical environments.

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Annual Meeting

2024 Company Annual Meeting

Ningbo Chenglong convened its 2024 annual meeting, setting strategic goals and reinforcing team commitment to excellence and innovation.

Read More →

Get in Touch

Reach out to us for product inquiries, quotations, or partnership opportunities.

Contact Information

Phone: +86 157 2800 1649
Email: [email protected]
Address: No. 625, Zhenning East Road, Zhenhai District, Ningbo City, Zhejiang Province, China
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