Cup square Hex Bolt & Nut BZP M12 x 100 mm

Cup Square Hex Bolt & Nut BZP M12 x 100mm by Owlett Jaton (Hexstone Limited) is a Grade 4.8 bright zinc plated steel carriage bolt, supplied complete with a hexagon nut and conforming to DIN 603/555. Also widely known as a coach bolt, it is the go-to fastener for trade professionals and DIY enthusiasts tackling heavy timber joinery, structural woodworking, and outdoor construction projects across the UK.

Key Features and Specifications

• Brand: Owlett Jaton (Hexstone Limited) — Unifix range
• Thread size: M12 (12 mm diameter)
• Length: 100 mm
• Thread pitch: 1.75 mm
• Head diameter (dk): approx. 30.65 mm domed cup head
• Spanner size: 19 mm (hex nut)
• Material: Mild steel, Grade 4.8
• Finish: Bright Zinc Plated (BZP) for corrosion resistance
• Standard: DIN 603 (bolt) / DIN 555 (nut)
• Supplied with: Matching hexagon nut
• Self-locking square neck: Bites into timber to prevent bolt spinning during tightening

Applications

• Joining and fastening heavy structural timbers
• Timber frame and post-and-rail fencing construction
• Garden gate and decking assembly
• Furniture making and joinery
• Fastening metal brackets or plates to timber
• Agricultural and equestrian fencing and stable construction
• General construction and building site fixings

Why Choose This Product

Owlett Jaton is a trusted UK fastener specialist with a long-established reputation among trade buyers. These BZP M12 x 100mm cup square bolts meet DIN 603/555 standards, ensuring consistent quality and dimensional accuracy. The bright zinc plated finish provides reliable corrosion resistance for both indoor and outdoor use. The self-locking square shank eliminates the need for a second tool when tightening — a practical advantage on site. Trade quantities are available, making this an efficient choice for builders merchants, contractors, and large-scale projects.

Delivery in and Around London

We deliver the Owlett Jaton Cup Square Hex Bolt & Nut BZP M12 x 100mm to customers across London and the South East, including inner boroughs such as Croydon, Lewisham, Southwark, Camden, and Hackney, as well as Greater London areas including Enfield, Bexley, Redbridge, and Barnet. We also supply to the surrounding counties of Kent, Essex, Surrey, and Hertfordshire. Trade quantities are welcome. Contact us for bulk pricing and availability.