NASM21045C8S

Internally threaded fasteners (hex nuts, lock nuts, castle nuts, wing nuts, self-locking nuts) and washers (flat, lock, spring, and special washers) used to distribute load and secure threaded assemblies.

Reading the part number. NASM21045C8S is a NASM number: when the Defense Department cancelled most MS hardware sheets, the National Aerospace Standards Committee adopted them as NASM standards, so NASM21045 is the direct successor to MS21045 and the parts are interchangeable. The suffix C8S selects the size or configuration variant from the standard's tables.

Price in context. Across the 1,144 items we currently stock in FSC 5310 (Nuts and Washers), published unit prices run from $0.12 to $68,673.00. At $262.84, this item sits well above the class median of $8.76 — typical of assemblies and higher-value line items in this class.

Stock activity. This item has appeared once in our supplier stock feed, most recently listed 2026-08-21, with a lot quantity of 66 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.

Who orders NASM21045C8S. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5310-01-338-8183. You can order by part number or by stock number — it is the same item, the same published price, and the same quote form.

Applicable standards. ASME B18.2.2 / B18.16, B18.21 / B18.22, NASM/MS series; steel, stainless, and self-locking (nylon-insert and all-metal) designs.

Need this part modified, or a similar part made to your print? See our U.S.-based CNC machining services and aerospace machining capability.