M12 x 150MM Cup Square Bolt ( 1 Piece )

M12 x 150MM Cup Square Bolt by Owlett Jaton (Hexstone Limited) is a robust, bright zinc plated (BZP) carriage bolt engineered for demanding timber and structural fixing applications. Also known as a coach bolt or carriage bolt, it is a trusted choice for UK tradespeople and DIY enthusiasts who need a secure, tamper-resistant fastener that conforms to DIN 603. Sold as a single piece, it suits both one-off repairs and larger trade projects.

Key Features and Specifications

• Thread diameter: M12 (12 mm)
• Length: 150 mm
• Finish: Bright Zinc Plated (BZP) — provides corrosion resistance for indoor and sheltered outdoor use
• Head type: Domed / round cup head — low-profile and tamper-resistant
• Square neck: Anti-rotation square section under the head bites into timber, preventing the bolt from spinning during tightening
• Standard: DIN 603
• Material: Mild steel with BZP coating
• Supplied: 1 piece (bolt only — nut and washer sold separately)
• Brand: Owlett Jaton / Hexstone Limited (Unifix range)

Applications

• Timber-to-timber jointing — ideal for structural joinery, joist construction, and heavy timber framing
• Metal-to-timber fixing — securing brackets, plates, and connectors to wooden structures
• Garden decking and outdoor structures — pergolas, raised decking frames, and fencing panels
• Garden furniture construction and repair
• Playground equipment, agricultural buildings, and general construction fixings
• Situations with limited access to both bolt ends — the self-locking square neck removes the need for a second tool on the bolt head

Why Choose This Product

The M12 x 150MM Cup Square Bolt from Owlett Jaton delivers reliable performance backed by a recognised UK trade brand. The BZP finish offers solid corrosion resistance for most construction environments, while DIN 603 compliance guarantees consistent dimensional accuracy. Selling by the single piece means you buy exactly what you need — no overspending on packs. The domed head is inherently tamper-resistant, and the self-locking square neck speeds up installation wherever access is restricted.

Delivery in and Around London

We deliver this product swiftly to trade and retail customers across London boroughs including Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas such as Enfield, Bexley, Redbridge, and Barnet. We also supply customers throughout the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome — contact us for volume pricing. Standard next-day and express delivery options are available; please check checkout for your postcode eligibility.