12387270-166

Externally threaded fasteners designed to be turned to assemble or adjust parts, including machine screws, cap screws, socket-head cap screws, set screws, self-tapping and thread-forming screws. This is the largest single class in the U.S. supply system and covers a vast range of thread sizes, drive types, head styles, and materials.

Reading the part number. 12387270-166 is a drawing-style part number assigned by the original design activity rather than a published standard; the -166 suffix denotes a dash variant — a specific configuration of base drawing 12387270. For drawing-number parts, the NSN is often the easiest way to confirm you have the right item — this one cross-references to the stock number below.

Price in context. Across the 2,357 items we currently stock in FSC 5305 (Screws), published unit prices run from $0.03 to $14,752.17. At $28.12, this item sits well above the class median of $10.52 — 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 2026-07-10, with a lot quantity of 105 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.

Who orders 12387270-166. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5305-01-387-4672. 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 B18.3 / B18.6.3, MIL-DTL / NASM / MS and AN series, ISO metric threads; common materials include carbon and alloy steel, 300/400-series stainless, and A2/A4 stainless per ISO 3506.

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