Simpson Strong-Tie BC40Z ZMAX Post Base & Cap Combo, Heavy-Duty 4″ x 4″

Secure your 4×4 posts with confidence using the Simpson Strong-Tie BC40Z dual-purpose post base and cap combo. Crafted from 18-gauge steel with a durable ZMAX® galvanization, this heavy-duty connector resists corrosion for long-lasting performance in exterior and treated-wood applications. The BC40Z’s opposing nail pattern helps prevent wood splitting and provides consistent, straight connections, whether you’re anchoring to hardened concrete or attaching to a wood supporting member.

Whether you’re building decks, pergolas, patio covers or garden structures, the BC40Z combines a post cap and base in one versatile piece—simplifying installation and delivering reliable uplift and lateral resistance.

Key Features

• Dual-purpose design: functions as both post cap and post base
• ZMAX® galvanization: superior corrosion resistance for outdoor use
• 18-gauge steel construction: light-duty yet heavy-duty strength
• Opposing nail pattern: reduces chance of splitting and maximizes load capacity
• Versatile connector: stronger than angled nailing or screws alone
• Easy installation: use 16d common nails or 16d × 2½″ hot-dip galvanized joist hanger nails

⚠️ WARNING: This product can expose you to Tetrabromobisphenol A known to the State of California to cause cancer and Epichlorohydrin known to cause birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.