M12 x 300mm Hot Dip Galvanised Cup Head Bolts & Nuts

M12 x 300mm Hot Dip Galvanised Cup Head Bolts & Nuts are engineered for the most demanding timber joinery applications. With an extra-long 300mm length and 12mm thick shaft, they deliver deep, heavy-duty fastening for oversized posts, beams, and structural timber. The hot-dip galvanised coating offers outstanding rust protection, making these bolts ideal for long-term outdoor use in wet, coastal, or exposed environments. The rounded cup head provides a clean, tamper-resistant finish, combining strength with a professional appearance.