Calculate bolt count and layout for structural connections, and validate NDS minimum spacing and end-distance requirements for your bolt diameter.
TOTAL BOLTS
— bolts
for the connectionUsage Tip
Pre-drill at 85–90% of bolt diameter to prevent splitting, and use washers under both the head and nut for wood connections.
THE MATH
Bolts/row = ⌊(L − 2×End) ÷ Spacing⌋ + 1
Total = Bolts/row × Number of rows
• NDS: end distance ≥ 7× diameter • spacing ≥ 4× diameter
• Stagger rows to avoid splitting along one grain line
• Stagger rows to avoid splitting along one grain line