M16 x 300mm Hot Dip Galvanised Cup Head Bolts & Nuts

Designed for heavy timber projects, these M16 x 300mm bolts and nuts provide deep anchoring for oversized beams and large posts. The extra-long 300mm length paired with a 16mm diameter ensures a solid, secure connection in structural timber assemblies.

The hot-dip galvanised coating offers long-term rust and corrosion protection, suitable for outdoor and coastal environments. A smooth, round cup head delivers a flush finish with tamper resistance for heavy-duty frameworks, landscaping, and decking builds.

Why customers choose these

• Extra-long 300mm length for deep anchoring
• Thick 16mm diameter for maximum strength
• Hot-dip galvanised coating for corrosion resistance
• Flush, tamper-resistant cup head for secure, clean finishes

Shipping options available. In‑store pickup available — contact us for pickup location & hours.