What is Carriage Bolt?

 

A carriage bolt is a specialized structural fastener widely adopted for wood to wood and wood to metal assembly. Designed with a smooth round head and a square shank neck, its square neck embeds firmly into the base material during installation, locking the bolt in place to stop spinning while tightening and delivering a firm, long lasting connection.


Commonly applied in construction projects, woodworking, mechanical assembly, outdoor frameworks and furniture installation, it is ideal for scenarios requiring anti loosening and tamper resistant fastening performance.

What Is Carriage Bolt?

01

Smooth round head for a neat, snag free surface

02

Square neck locks against rotation for easy tightening

03

Perfect for wood metal and wood wood joining

04

High stability and anti loosening fastening effect

 

 

 

 

 

Reliable Carriage Bolt Supplier for Industrial Projects

 

Consistent Quality, Scalable Production, Global Wide Supply & On Time Delivery

 

As a trusted industrial grade carriage bolt supplier, our factory features standardized production workflows and rigorous quality management systems to maintain steady batch to batch quality. Every process from raw material selection to finished product testing complies with DIN, ASTM and other international industrial standards.


With scalable production capacity, stable lead times and strong bulk order fulfillment capability, we provide long term reliable supply for global industrial projects, wholesalers, distributors and OEM partners. We also offer tailored custom carriage bolt services to satisfy diverse industrial application demands.

Reliable Carriage Bolt Supplier for Industrial Projects
 

 

 

 

 

Carriage Bolt Product Range

 

 

We offer a complete range of carriage bolts for bulk carriage bolt procurement, covering multiple materials, finishes, and standards.

 

 

 

 

Carriage Bolts Uses

 

 

Widely Applied in Timber Construction, Steel Structures & Mechanical Assembly. The anti rotation square neck delivers firm, long lasting fastening performance.

 

 
Construction Industry

Construction Industry

Ideal for timber framed buildings and structural connections, offering stable fastening performance for high load engineering scenarios.

Mechanical Equipment

Mechanical Equipment

Used for machinery assembly, featuring excellent anti loosening property to maintain stable fastening during long term operation.ne is in the right jobs sicing elit

Agricultural Machinery

Agricultural Machinery

Suitable for farm machinery and outdoor equipment, maintaining stable performance under complex and changeable working environments.

PV Solar Systems

PV Solar Systems

Applied to solar bracket connections, resisting wind load and vibration to ensure structural safety and reliability.

 

 

 

 

Carriage Bolts Dimensions Specifications

 

 

Key dimensions of carriage bolts including head diameter, square neck size, and thread length are critical for proper installation.
 

We strictly comply with international standards such as DIN, ISO, ASTM, and JIS, and can provide customized dimension solutions according to your specific project needs. The following are common standard specifications for your reference (detailed parameters can be provided upon request):

 

Standard Carriage Bolt Dimensions (Metric)

Thread Size

Length Range (mm)

Head Diameter (mm)

Square Neck Size (mm)

M6

10 – 100

16

6.5 × 6.5

M8

16 – 120

20

8.5 × 8.5

M10

20 – 150

24

10.5 × 10.5

M12

25 – 200

30

12.5 × 12.5

M16

30 – 200

38

16.5 × 16.5

 

Material & Surface Treatment Supplementary Table

Material

Strength Grade

Surface Treatment

Applicable Scenarios

Carbon Steel

4.8 / 8.8 / 10.9

Zinc Plating, Black Oxide, Hot-Dip Galvanizing, Nickel Plating, Dacromet

General Construction, Machinery Assembly, Outdoor Structures

Stainless Steel

A2-70 / A4-80

Passivation, Natural Finish, PTFE (Teflon), Anodizing

Humid Environment, Marine Engineering, Food Machinery

Titanium Alloy / Brass

Customizable

Anodizing, Nickel Plating, Natural Finish

High-Corrosion Resistance, Special Industrial Scenarios

Note: We support customizations for thread size, length, head diameter, and square neck size for bulk orders. For inch-size carriage bolts (complying with ASTM/SAE standards), please contact us for detailed specifications.

 

 

 

 

 

Custom Carriage Bolt Manufacturing Services

 

Flexible Solutions for Drawings, Non-standard Sizes, and Bulk Orders

 

We are a professional carriage bolt manufacturer with mature custom manufacturing capabilities, dedicated to providing flexible and reliable solutions for global bulk buyers. No matter your specific requirements—whether it’s non-standard dimensions, special material selection, customized strength grades, or personalized surface treatment—we can fully meet your needs based on the drawings, technical parameters, or detailed requirements you provide. Our team has rich experience in custom production, from the initial technical confirmation to the final mass production, ensuring that every custom carriage bolt meets your application scenarios and performance standards.

 

In addition, we also provide OEM customization support, including custom packaging, labeling and logo printing, to help distributors, brand owners and OEM partners better adapt to market needs and enhance brand competitiveness. With scalable production capacity, strict quality control and efficient order management, we are your trusted partner for custom carriage bolt bulk orders.

Custom Carriage Bolt Manufacturing Services
 

 

 

 

Why Choose Us as Your Carriage Bolt Supplier

 

 

Built for Bulk Buyers and Global Supply, Supporting Wholesale and Custom Carriage Bolt Requirement

 

 

Factory Direct Supply

As a professional carriage bolt factory, we have stable production capacity and strict quality control to ensure consistent product performance for bulk orders.

 
 

Bulk & Wholesale Support

We offer competitive pricing and flexible production capacity, perfectly meeting bulk purchasing and long-term cooperation needs.

 
 

Stable Delivery

With a sound production plan and order management system, we guarantee on-time delivery and reduce supply risks for your projects.

 
 

Professional Custom & Global Service

We have rich experience in custom production and global cooperation, familiar with international standards and diverse industry needs.

 

 

 

 

 

FAQ

 

 

 

Q1: What materials are available for your carriage bolts?

A: Common materials include carbon steel (Q235, 45#), stainless steel (304, 316, 316L), titanium alloy, and brass. We can also customize materials according to your application scenarios, fully meeting the needs of different corrosion resistance and strength requirements.

Q2: Do your carriage bolts comply with international standards?

A: Yes, our products fully comply with international standards such as DIN 6921, ISO 4162, ASTM A307, SAE J429, and JIS B 1171, meeting global procurement requirements and various industry application standards.

Q3: Can carriage bolts be customized?

A: Yes, we provide comprehensive customized carriage bolt solutions, covering non-standard sizes, strength grades, material selection, surface treatments, and full-process OEM/ODM services. We especially welcome bulk customized orders and will offer professional consulting services tailored to your project.

Q4: Can I request samples before placing a large order?

A: Yes, we can provide standard or custom samples according to your requirements. The sample fee can be fully refunded or deducted from the corresponding payment after you confirm the bulk order, helping you verify product adaptability with confidence.

Q5: What is the minimum order quantity (MOQ) for carriage bolts?

A: For standard in-stock carriage bolts, the MOQ is generally 500-1000 units per specification. For large-scale industrial projects or customized carriage bolts, we can flexibly negotiate and adjust based on your specific needs.

Q6: What is the lead time for carriage bolt orders?

A: The lead time depends on the order quantity. Normally, standard in-stock orders can be produced and shipped within approximately 30 days. For customized orders, the lead time is usually 30-45 days based on specific specifications, materials, and order volume. We will make every effort to meet the needs of urgent projects.

Q7: How do you ensure the quality of bulk carriage bolt products?

A: We implement strict quality control throughout the production process, from raw material inspection, dimensional accuracy control to surface treatment testing, ensuring consistent quality of each batch. In addition, we warmly welcome customers or third-party institutions to conduct factory audits and quality inspections, and can provide a full set of compliant documents.

Q8: What factors affect the price of carriage bolts?

A: The price of carriage bolts is mainly affected by factors such as material type, strength grade, specification size, surface treatment process, order volume, and customization complexity. For bulk orders and long-term cooperation, we can provide more competitive tiered quotations.

Q9: Which industries commonly use carriage bolts?

A: Carriage bolts are widely used in construction engineering, woodworking, general machinery, agricultural equipment, PV solar systems, marine engineering, and infrastructure construction. We can provide customized solutions for standard application scenarios in different industries and special needs of heavy industry.

Q10: How are carriage bolts packaged for bulk shipments?

A: For bulk shipments, we default to a combined packaging of anti-rust bags + export standard cartons + pallet reinforcement. Meanwhile, we can provide personalized customized packaging solutions according to special project requirements or OEM packaging specifications.

Q11: Do you provide international shipping? What transportation methods are available?

A: We provide global international shipping services, supporting mainstream methods such as sea freight and air freight. Trade terms can be flexibly selected from FOB, CIF, or DDP, ensuring the safe and on-time delivery of carriage bolts to the destination.

Q12: What after-sales support is provided?

A: We offer comprehensive professional after-sales guarantees, including product technical guidance, free replacement of unqualified products, and consulting services for exclusive cooperation plans for long-term, repeated bulk orders.

 

 

 

 

modular-1

Built for Bulk Buyers and Global Supply, Supporting Wholesale and Custom Carriage Bolt Requirements

As a professional carriage bolt factory, we provide competitive factory-direct pricing for bulk orders, whether it’s standard in-stock products or customized solutions. We tailor quotation plans according to your specific needs, including material, specification, order quantity, and customization requirements, ensuring you get the most cost-effective solution.

Send us your detailed requirements (specifications, material, quantity, customization needs, etc.), and our team will respond quickly and provide a professional quotation within 24 hours. We are committed to supporting your global procurement and project needs with reliable products and considerate services—contact us now to get your exclusive quote!

 

We're professional carriage bolt manufacturers and suppliers in China, specialized in providing high quality custom service. We warmly welcome you to wholesale high-grade carriage bolt at competitive price from our factory.

5mm coach bolts, m12 coach bolts 130mm, m6 x 60mm coach bolt

(0/10)

clearall