Premium Fasteners for Industry & Construction

Trusted manufacturer and exporter of high-quality socket screws, carriage bolts, hex flange bolts, and guardrail bolts. Engineered for strength, precision, and durability in demanding applications worldwide.

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2013

Founded with Excellence

50+ Countries

Global Distribution Network

ISO Standards

Quality Certified Manufacturing

About Best-Bolts.com

Hangzhou TR Industrial Trade Co., Ltd, operating as Best-Bolts.com, is a leading manufacturer and exporter of industrial fasteners based in Zhejiang, China. Established in 2013 and expanded in 2020, we specialize in high-performance socket screws, carriage bolts, hex flange bolts, and guardrail bolts.

Our mission is to deliver superior quality fasteners at competitive prices, backed by reliable service and on-time delivery. We work closely with trusted manufacturing partners to ensure every product meets international standards including DIN, ISO, and ASTM.

With a customer-first philosophy, we serve industries ranging from construction and automotive to infrastructure and machinery. Our team is committed to building long-term partnerships through consistent quality and responsive support.

Our Products

Precision-engineered fasteners designed for strength, reliability, and performance in industrial and structural applications.

DIN6921 Hex Flange Bolts

High-strength bolts with integrated washer face for even load distribution. Ideal for automotive and machinery applications.

DIN912 Hex Socket Screws

Fully threaded socket head cap screws with hex key drive. Available in Grade 12.9 and stainless steel variants.

DIN7984 Thin Head Cap Screws

Low-profile socket head cap screws for space-constrained applications. Excellent for precision engineering.

DIN603 Carriage Bolts

Smooth domed head with square neck prevents rotation. Commonly used in wood-to-metal connections.

Highway Guardrail Bolts

Heavy-duty bolts designed for road safety systems. Corrosion-resistant and impact-tested for reliability.

Stainless Steel DIN912 Screws

Corrosion-resistant socket head cap screws ideal for marine, chemical, and outdoor environments.

DIN7991 Countersunk Screws

Flat head socket screws for flush mounting. Perfect for aesthetic and space-saving applications.

Cup Point Set Screws DIN916

Threaded set screws with cup point for secure locking in pulleys, gears, and shafts.

ISO 7380 Button Head Screws

Semi-round head socket screws with clean appearance. Used in machinery and electronic enclosures.

Black Hex Countersunk Screws

Black oxide finish for enhanced corrosion resistance and visual contrast. Ideal for industrial assembly.

Class 12.9 Zinc Allen Screws

Ultra-high tensile strength with zinc plating for rust protection. Suitable for critical load applications.

Stainless Steel DIN7984 Screws

Low head cap screws in A2/A4 stainless steel. Corrosion-resistant and ideal for tight spaces.

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Why Choose Best-Bolts.com

Engineered for excellence, trusted by industries worldwide.

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Precision Engineering

Tight tolerances and consistent threading ensure perfect fit and performance every time.

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High Durability

Materials tested for tensile strength, corrosion resistance, and long-term reliability.

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Global Export

Serving customers in over 50 countries with fast shipping and reliable logistics.

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Quality Assured

Compliant with DIN, ISO, and ASTM standards. Full traceability and certification available.

Frequently Asked Questions

What is the difference between a carriage bolt and a coach bolt?

There are significant differences in design and use between a carriage bolt and a coach bolt. Carriage bolts have a smooth, domed head with a square neck that prevents rotation during installation, commonly used in wood-to-metal connections. Coach bolts are often used interchangeably but may vary in head shape and application depending on regional standards.

What is a carriage bolt used for?

Carriage bolts are mainly used to connect and fix structural members made of wood, metal, or other materials. Their unique head design allows them to fit tightly against the surface, providing a secure and tamper-resistant fastening solution.

Are guardrail bolts compatible with different guardrail systems?

Yes, our highway guardrail bolts are engineered to meet standard specifications and are compatible with most common guardrail systems. They are tested for impact resistance and durability under extreme conditions.

Do you offer custom fastener solutions?

Yes, we provide OEM and ODM services. Contact us with your specifications for custom sizes, materials, finishes, and packaging options.

What materials are your socket screws made from?

Our socket screws are available in carbon steel (Grade 8.8, 10.9, 12.9), alloy steel, and stainless steel (A2-70, A4-80). Custom materials available upon request.

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