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Premium Bolts & Fasteners for Industrial Excellence

Topbolt is a trusted Chinese manufacturer with over 20 years of experience producing high-strength fasteners conforming to DIN, ISO, ASTM, ANSI, BS, JIS, and GB standards. Specializing in bolts, nuts, washers, threaded rods, and custom hardware solutions.

2001
Founded In
15,000
㎡ Factory Area
2,000
Tons Monthly Capacity
+50M
Annual Sales (USD)

About Topbolt

Ningbo Topbolt Metalworks Co., Ltd. is a professional manufacturer in China specializing in high-strength fasteners and all kinds of hardware products. Founded in 2001, the company has grown rapidly with its production base located in the Ningbo Zhenhai Chemical Industrial Area and its headquarters and foreign sales department in Ningbo Jiangdong Eastern Business Centre.

Our factory covers an area of approximately 15,000 square meters, with a monthly production capacity of 2,000 tons. We maintain a comprehensive research system, efficient supply chain management, and large-scale warehousing to ensure timely delivery and consistent quality.

  • 20+ Years in Fastener Manufacturing
  • ISO, DIN, ASTM, ANSI, JIS, BS, GB Compliant
  • Carbon, Alloy, and Stainless Steel Options
  • Custom Fastener Solutions Available
Contact Our Team
Topbolt Factory and Standards

Our Products

Precision-engineered fasteners meeting international standards for strength, durability, and reliability across industries.

Hex Bolts

High-strength bolts conforming to DIN, ISO, ASTM, ANSI, BS, JIS standards.

  • Grades: A325, A325M, A490, A490M, 8.8, 10.9, 12.9, Gr5, Gr8
  • Coating: Plain, Black, Galvanized, H.D.G, YZP, Dacromet, Xylan
  • Sizes: M4–M100, 3/8"–4"

Thread Rods

Long-length threaded rods for structural and mechanical applications.

  • Max Length: Up to 3.66 meters (12FT)
  • Sizes: M4–M100, 3/8"–4"
  • Thread: Full thread, metric and inch sizes

Nuts

Wide range of nut types for secure fastening solutions.

  • Types: Hex, Cap, Coupling, Lock, Spring Nuts
  • Sizes: M4–M100, 3/8"–4"
  • Standards: DIN, ISO, ANSI, JIS, GB

Washers

Flat and spring washers for load distribution and vibration resistance.

  • Types: Flat Washer, Spring Washer
  • Specifications: M3–M100, 1/4"
  • Materials: Carbon, Alloy, Stainless Steel

Custom Fasteners

Tailored solutions based on customer drawings or samples.

  • Customization: Based on drawings or samples
  • Sizes: Metric and inch available
  • Applications: Specialized industrial needs

Precast Accessories

Hardware components for precast concrete construction.

  • Customization: Based on drawings or samples
  • Sizes: Metric and inch available
  • Use: Structural precast systems
ASTM B7 Rod

ASTM B7/B7M Rods

High-strength alloy steel threaded rods for high-temperature service.

  • Standard: ASTM A193 B7 / B7M
  • Material: Chromium-Molybdenum Steel
  • Applications: Pressure vessels, valves, flanges
DIN GB ANSI Fasteners

DIN/GB/ANSI Fasteners

Comprehensive range meeting multiple international standards.

  • Standards: DIN, GB, ANSI, ISO, JIS, BS
  • Types: Bolts, Nuts, Washers, Rods
  • Materials: Carbon, Alloy, Stainless Steel

Our Capabilities

Advanced manufacturing and quality assurance systems ensure precision and consistency.

Advanced Manufacturing

15,000㎡ facility with automated production lines and 2,000 tons monthly capacity. Full in-house control from raw material to finished product.

Quality Assurance

Rigorous testing for tensile strength, hardness, coating thickness, and dimensional accuracy. Full traceability and certification available.

Global Standards

Products conform to DIN, ISO, ASTM, ANSI, BS, JIS, and GB specifications. Trusted by clients across North America, Europe, Asia, and the Middle East.

Material Expertise

Carbon steel, alloy steel, and stainless steel fasteners. Custom material selection based on environmental and mechanical requirements.

Custom Engineering

Capable of producing custom fasteners based on customer drawings, samples, or specifications. Rapid prototyping and tooling development.

Logistics & Supply

Large-scale warehousing and efficient supply chain management ensure on-time delivery worldwide. Flexible packaging and labeling options.

Industries We Serve

Our fasteners are trusted in critical applications across diverse sectors.

Steel Structures

High-strength bolts and fasteners for commercial buildings, industrial facilities, and large-span structures.

Bridges

Reliable connections for bridge construction and maintenance, meeting strict safety and durability standards.

Shipbuilding

Corrosion-resistant fasteners for marine environments, including vessels and offshore platforms.

Solar Power

Mounting hardware and structural fasteners for solar panel installations and renewable energy systems.

Oil & Pipeline

High-pressure and high-temperature fasteners for refineries, pipelines, and petrochemical plants.

Railway

Durable fastening systems for rail tracks, signaling, and rolling stock applications.

Why Choose Topbolt?

Certified Quality

Products conform to DIN, ISO, ASTM, ANSI, BS, JIS, and GB standards with full documentation.

Timely Delivery

2,000-ton monthly capacity and efficient logistics ensure on-time shipments worldwide.

Custom Solutions

Capable of producing fasteners based on your drawings, samples, or unique specifications.

Get in Touch

Ready to discuss your fastener needs? Contact Topbolt today for expert support and competitive pricing.

Explore our full product catalog, request a quote, or connect with our sales team directly through our official website.

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