225PCS #4-40 to 3/8"-16 Stainless Steel Nylon-Insert Locknuts/Elastic Stop Nuts Assortment Kit,for #4-40#6-32#8-32#10-24#10-32 1/4"-20 5/16"-18 3/8"-16 Screws/Bolts

Use these hex nuts for general purpose fastening applications A nylon insert grips threads to resist loosening Also known as elastic stop nuts,these can be used as a stop or a spacer for rotating parts Nuts can be removed without damaging threads They are reusable (unless noted), but their holding power lessens with each use Nylon absorbs moisture, which can cause the insert to become brittle over time in wet environments Package includes: 225pcs 8 Sizes #4-40 NUC #6-32 NUC #8-32 NUC #10-24 NUF #10-32NUF 1/4"-20 NUC 5/16"-18 NUC 3/8"-16 UNC Hex Nylon-Insert Locknuts Assortment Kit; comes with the plastic box: List (Type, Quantity): Nylon-Insert Locknuts #4-40 UNC 50PCS Nylon-Insert Locknuts #6-32 UNC 40PCS Nylon-Insert Locknuts #8-32 UNC 30PCS Nylon-Insert Locknuts #10-24 UNF 30PCS Nylon-Insert Locknuts #10-32 UNF 30PCS Nylon-Insert Locknuts 1/4"-20 NUC 20PCS Nylon-Insert Locknuts 5/16"-18 UNC 15PCS Nylon-Insert Locknuts 3/8"-16 UNC 10PCS