Part Number: 14-20HNSFSS (Nut hex serrated fl)Part Number: 14-28HNSFSS (Nut hex serrated fl)Part Number: 14-28HNSFZP (Nut hex serrated fl)Part Number: 38-16HNSFSS (Nut hex serrated fl)Part Number: 38-24HNSFSS (Nut hex serrated fl)Part Number: 516-24HNSFZP (Nut hex serrated fl)Part Number: 716-20HNSFZP (Nut hex serrated fl)