Woodworking Sep 29, 2026 5 min read Metabo HPT NT1850DF Nail Size: What Fits The NT1850DF takes 18-gauge brad nails from 5/8 to 2 inches long, with a maximum diameter of 0.131 inch. Use that range to check fastener compatibility and select a length for the material you’re joining. Read post: Metabo HPT NT1850DF Nail Size: What Fits