Preterea carbonum ferrum, ferrum (mites ferrum), medium carbonum ferrum, acine ferrum, immaculatum ferrum et aes, aluminium nuces admixtae.

Ferrum Grade 4.8 circa M5 M6 Auto Parce Rectangulum Quadratum Nut
Diver A2/A4 M6 M8 M10 M12 nativus Stamping Nut
Carbon Steel Grade 6.8/8.8 Zinc Plated Non-vexillum Stamping Rectangulum Duo Hole Nux
M6 M8 M10 M12 Carbon Steel HDG Stamping Square Thin Nut
Diver SS201/SS304/SS316 Chamfering Square Nuces
Steel SS201 SS304 Stamping Rectangularis Nucis