Nylon threads are made up of polyamide. Some common examples are nylon 6 and nylon 66. Nylon 6 H2​N−Monomer(CH2​)5​​−COOH−NH−(CH2​)5​−C∥O−NH−(CH2​)5​−C∥O−NH−PolymerNylon 66HO−C∥O−(CH2​)6​COOH and H2​N−(CH2​)4​−NH2​ are monomers HN−C∥O−(CH2​)4​−C∥O−NH−(CH2​)6​−NH−C∥O−(CH2​)4​−C∥O− nylon-66 (polymer)