Vifuniko vya chuma vya pua 316L vinatengenezwa kwa chuma cha chini cha kaboni austenitic. Nyenzo ni kaboni, manganese, silicon, fosforasi, kiberiti, 18% chromium, 2% molybdenum, 10% nickel na nitrojeni. Kuna aina tofauti za kufunga kama vile SS UNS S31600 mraba bolts, bolts hex, screws, karanga na washers.