MS21251-B3S

General-purpose commercial hardware including brackets, clamps, hinges, handles, latches, catches, hold-downs, plugs, and mounting hardware not covered by a more specific class.

Reading the part number. MS21251-B3S breaks down as MS21251 — the Military Standard sheet that fixes the part's design — plus the dash/suffix code B3S, which selects the exact size, material, or finish variant from the tables on that standard. Two parts sharing the MS21251 base are the same design in different variants.

Price in context. Across the 420 items we currently stock in FSC 5340 (Hardware, Commercial), published unit prices run from $0.35 to $14,018.40. At $5.25, this item sits well below the class median of $59.58 — commodity hardware usually bought in volume.

Stock activity. This item has appeared once in our supplier stock feed, most recently listed 2026-08-12, with a lot quantity of 266 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.

Who orders MS21251-B3S. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5340-00-067-9875. 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. MS, MIL-DTL, and commercial standards; steel, stainless, aluminum, and plated finishes.

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