Coach Bolts

Coach bolts, also known as carriage bolts or cup head bolts, are strong, tamper-resistant fasteners with a domed head and square neck designed to lock into timber and prevent rotation once installed. They are widely used in timber, metal, and general construction applications where a secure, long-lasting fix is required. RS Australia is a trusted supplier of coach bolts Australia-wide, stocking a broad selection in multiple finishes and sizes. Browse our full range and shop now for fast delivery.

Benefits of Carriage Bolts

The carriage bolt is valued in construction and fabrication for its combination of holding strength, tamper resistance, and a clean, installed finish. Key benefits include:

• Strong Fastening Solution: Coach bolts provide a reliable fix in timber, steel, and mixed-material assemblies where pull-through resistance is required.
• Clean, Low-Profile Finish: The rounded head design reduces snagging on adjacent surfaces and supports a tidier visible finish.
• Secure, Long-lasting Fix: Its square neck seats into the timber to prevent rotation under load, making them well-suited to load-bearing and high-vibration applications.
• Corrosion-Resistant Options: Galvanised, zinc-plated, and stainless steel variants are available for both indoor and outdoor use.

Shop Our Range of Coach & Carriage Bolts Australia

RS Australia stocks a comprehensive range of coach bolts to suit different load requirements, substrate types, and environmental conditions. Available in common metric sizes, including M6, M8, M10 and M12 coach bolts, our selection covers everything from light timber joinery to structural fixing and heavy fabrication work.

Galvanised Coach Bolts

Galvanised coach bolts feature a zinc coating applied through hot-dip galvanising, providing robust protection against moisture, weather exposure, and surface corrosion. Galvanised coach bolts are the preferred choice for outdoor structures, fencing, decking, and exposed timber framing, offering long service life in conditions where untreated steel would rapidly deteriorate.

Zinc Coach Bolts

Zinc coach bolts feature an electroplated zinc finish that offers light corrosion protection at a cost-effective price point. They are well-suited to general-purpose fastening in sheltered or indoor environments, including internal carpentry, furniture assembly, and workshop fabrication, where heavy weather exposure is not a concern.

Stainless Steel Coach Bolts

Delivering the highest level of corrosion resistance in the range, stainless steel coach bolts maintain their integrity in chloride-heavy and high-moisture conditions. They are the preferred choice for coastal construction, marine applications, poolside installations, and any environment where long-term durability against salt or humidity is essential.

How to Choose the Right Coach Bolts for Your Needs

Selecting the right coach bolt depends on the substrate being fixed, the operating environment, and the load the joint must carry. Consider the following factors:

• Environment: Match the bolt to the exposure conditions, whether indoor, outdoor, coastal, or otherwise corrosive.
• Finish: Galvanised coach bolts suit weather-exposed applications, zinc coach bolts are suitable for general indoor use, and stainless steel coach bolts are specified for marine and high-moisture environments.
• Size and Thread Length: Measure the combined thickness of the materials being joined, and add an allowance for washer and nut engagement. For example, fixing two 45 mm timber members typically requires a bolt of at least 100 mm to achieve proper thread engagement.
• Application Type: Timber joinery, fencing, machinery mounting, and structural fixing each carries different load and durability requirements.
• Head Style: The domed cup head profile provides a tamper-resistant, low-snag finish; confirm that it meets the visible-surface requirements of your assembly.
• Standards and Approvals: For regulated or structural applications, specify bolts that comply with relevant Australian standards such as AS 1111 or AS/NZS 1252.
• Grade: Match the strength grade, commonly 4.6 or 8.8, to the calculated load and shear requirements of the joint.

Common Industry Applications for Coach Bolts

Coach bolts are a staple fastener across the Australian trades and industrial sectors, with common applications including:

• Timber Construction and Carpentry: Coach bolts provide strong, tamper-resistant connections in framing, decking, pergolas, and structural timber assemblies.
• Fencing, Gates, and Outdoor Structures: Galvanised coach bolts are widely used in fence post fixing, gate hardware, and garden structures where weather resistance is essential.
• General Building and Maintenance: A versatile choice for site assembly, coach bolts are used for timber-to-steel connections, and retrofit fixing across residential and commercial projects.
• Fabrication and Assembly Work: Used in jigs, brackets, and mixed-material assemblies, they are essential for flush, low-snag heads.
• Commercial and Industrial Fastening: Across Australian manufacturing and warehousing facilities, coach bolts are specified for plant equipment mounting, storage racking, and other heavy-duty fixing tasks where load security is critical.

Your Trusted Carriage & Coach Bolts Supplier & Distributor in Australia

RS Australia is your reliable source for high-quality coach bolts and industrial fasteners. We stock an extensive range from our very own RS PRO line, covering multiple finishes, sizes, and grades at competitive prices, to ensure you find the right carriage bolt for your application. Our products are sourced to meet recognised Australian and international fastener standards, with technical support available from our team to assist with sizing, grade selection, and compliance queries.

We also carry other essential fastening components, such as washers, hex nuts, and security bolts, to complete your assembly requirements. Buy coach bolts online and benefit from fast delivery nationwide. For more details on delivery services and fees, please refer to our Delivery Page.