Versatile fixings for low load bearing applications. Square neck prevents twisting when used in ti...Versatile fixings for low load bearing applications. Square neck prevents twisting when used in timber. These coach bolts and nuts have a place in almost every toolbox. They're zinc-plated and 150 mm long with an M12 thread. They are mainly used for joining timber to timber in low load-bearing applications, as well as timber joist construction. So whether you're assembling garden furniture, making a pergola or fixing fence panels, these coach bolts will provide fastenings strong enough to withstand the elements. Versatile fixings for low load bearing applications. Square neck prevents twisting when used in timber. Pack of five bolts complete with hex nut. These Forgefix Carriage Bolts are Zinc Plated, and ideal for timber to timber joining. They come complete with a hex nut and are fully threaded to 100mm. Also known as 'Cup Square Hex Bolts', the square underneath the Cup stops rotation of the bolt when tightening. Conform to DIN603 and DIN934 standards. Available in a comprehensive range of sizes to suit most applications. Used mainly for fastening timber to timber and is extensively used for timber joist construction in house building and numerous decking applications. A Carriage Bolt, also known as a Coach Bolt or as a ‘Fully Threaded Cup Square Hex Bolt', has a domed or countersunk head, and the shank is topped by a short square section under the head. The square section grips into the part being fixed (typically wood).
ForgeFix Carriage Bolts | M12 x 100mm | Zinc Plated | Bag 5Free delivery in 1–3 days£5.70Visit shop →
ForgeFix Carriage Bolts With Nuts | M8 x 130mm | Zinc Plated | Bag 10 | Zinc Plated Square Neck Coach Bolts Steel Dome Head Fasteners with Hexagonal Nuts for Structural Timber JoiningFree delivery in 1–3 days£6.34Visit shop →
ForgeFix Carriage Bolts | M10 x 110mm | Zinc Plated | Bag 10Free delivery in 1–3 days£6.45Visit shop →
Carriage Bolt & Nut ZP M12 x 130mm Bag 5Free delivery in 1–3 days£6.47Visit shop →
ForgeFix Carriage Bolts | M12 x 150mm | Zinc Plated | Bag 5Free delivery in 1–3 days£6.79Visit shop →
ForgeFix Carriage Bolts | M12 x 200mm | Zinc Plated | Bag 5 | Zinc Plated Square Neck Coach Bolts. Steel Dome Head Fasteners with Hexagonal Nuts for Structural Timber JoiningFree delivery in 1–3 days£7.34Visit shop →
B&QB&Q - 5Cb12100 Carriage Bolt & Nut Zp M12 X 100mm Bag 5 Forcb12100G
Forgefix Unisex Silver Carriage Bolt & Nut Zp M10 X 65Mm Bag 10 InFree delivery in 1–3 days£7.90Visit shop →
Forgefix Unisex Silver Carriage Bolt & Nut Zp M10 X 110Mm Bag 10 InFree delivery in 1–3 days£8.37Visit shop →
Forgefix Unisex Silver Carriage Bolt & Nut Zp M12 X 150Mm Bag 5 InFree delivery in 1–3 days£8.85Visit shop →
Product Information
Full details
This guide is for DIY enthusiasts and trade professionals seeking reliable fixings for light-duty timber construction. The Forgefix M12 x 150 Coach Bolts offer a versatile and weather-resistant solution for joining timber components. While ideal for applications like garden furniture and fence panels, it's crucial to remember they are designed for **low load-bearing** uses.
All features
Colour
Silver
Model Part Number
5CB12150
Brand
Forgefix
Extended Product Information
FAQs
What does 'M12 x 150' mean?
'M12' refers to the nominal diameter of the bolt's thread in millimeters (M stands for Metric, 12mm diameter). '150' refers to the length of the bolt, also in millimeters, from underneath the head to the end of the thread.
Are these coach bolts suitable for outdoor use?
Yes, these Forgefix Coach Bolts are zinc-plated, which provides good resistance to rust and corrosion, making them suitable for general outdoor use in applications like garden furniture and fence panels.
Can I use these to join metal to timber?
While technically possible with appropriate washers and drilling, coach bolts are primarily designed for timber-to-timber connections where the square neck can bite into the wood. For metal-to-timber, consider using hex bolts with washers on both sides for a more secure and versatile connection.
How many bolts come in this pack?
This specific product is sold as a '5 Pack', meaning you will receive five M12 x 150 coach bolts, each complete with its corresponding hex nut.
What tools do I need to install these coach bolts?
You will need a drill, a drill bit (slightly larger than 12mm but smaller than the square neck, e.g., 12.5mm or 13mm), and a wrench (typically a 19mm spanner or socket for M12 nuts) to tighten the nuts.
What is the maximum load these bolts can hold?
These bolts are specified for low load-bearing applications. They are not designed for heavy structural loads where specific shear and tensile strength calculations are critical. Always consult a structural engineer for high-load applications.
Troubleshooting
Bolt spins freely when tightening the nut.
This usually means the square neck of the bolt is not fully engaged or has stripped the timber. Remove the bolt, ensure the pilot hole is correctly sized (not too large), and reinsert, potentially tapping gently to seat the square neck securely. If the timber is too soft or damaged, you might need to relocate the fixing or reinforce the timber.
Bolt is too long/short for the application.
Carefully measure the combined thickness of the timber pieces you are joining, plus the thickness of any washers, to ensure you select the correct bolt length. This M12 x 150mm bolt is designed for a specific range of thicknesses; if it's incorrect, you'll need a different size.
Signs of rust or corrosion appearing prematurely.
While zinc-plated, continuous exposure to harsh elements, or damage to the zinc coating, can lead to rust. Ensure the zinc plating wasn't scratched during installation. For extreme outdoor conditions, consider alternative fasteners with hot-dip galvanized or stainless steel finishes. Applying a protective paint over the bolt head and nut can also help.
Pros and Cons
Pros
Easy Installation in Timber: The square neck design simplifies installation, preventing rotation.
Weather Resistant: Zinc plating offers good protection against rust for outdoor use.
Secure Fastening: Provides a strong, reliable joint for appropriate timber applications.
Versatile for DIY Projects: Ideal for a wide range of common outdoor timber constructions.
Cons
Low Load Applications Only: Not suitable for high-stress or structural load-bearing connections.
Timber Specific: Primarily designed for use with timber; not ideal for metal-to-metal or other material fixings.
Specific Size: M12 x 150mm might be too large or too small for certain specific projects, requiring careful measurement.
Hand Tools Needed: Requires pre-drilling and wrenches for proper installation.
Setup, Compatibility & Care
Setup Instructions
Measure and Mark: Precisely measure and mark the locations for your bolts on both timber pieces to be joined.
Drill Pilot Hole: Using a drill bit slightly larger than the threaded shaft of the M12 bolt but smaller than the square neck (e.g., a 12.5mm or 13mm drill bit for the M12 bolt), drill a straight pilot hole through both pieces of timber. Ensure the hole is perpendicular to the surface.
Insert Bolt: Push the coach bolt through the drilled hole. If the square neck does not fully engage with the timber, you may need to gently tap the bolt head with a hammer (using a block of wood as a buffer to protect the bolt head) until the square neck is seated firmly and resists turning.
Attach Nut: Place the hex nut onto the threaded end of the bolt. For added stability, consider using a washer between the nut and the timber surface.
Tighten: Use an appropriate wrench (typically 19mm for M12 nuts) to tighten the hex nut until the connection is secure. Do not overtighten, as this can damage the timber.
Compatibility
Materials: Primarily designed for joining timber to timber. Can also be used for timber joist construction.
Environments: Zinc-plated finish makes them suitable for general outdoor and indoor use. Avoid highly corrosive or marine environments.
Load Type: Low load-bearing applications only.
Care and Maintenance
Inspection: Periodically inspect outdoor installations for any signs of loosening or corrosion, especially after harsh weather.
Cleaning: Wipe away dirt or debris to prevent buildup that could trap moisture.
Protection: While zinc-plated, applying a suitable exterior wood sealant or paint over the bolt heads and nuts in highly exposed areas can further extend their lifespan and maintain appearance.