National Stock Number
Flat Washer — Nuts and Washers (FSC 5310)
| National Stock Number | 5310-00-728-9957 |
|---|---|
| Item name | Flat Washer |
| Unit of issue | EA |
| NIIN | 007289957 |
| NIIN assigned by | United States (NCB code 00) |
| Federal Supply Class (FSC) | 5310 — Nuts and Washers |
| Federal Supply Group (FSG) | 53 — Hardware and Abrasives |
| Unit price (USD) | $0.52 |
| Country of origin | Türkiye (Turkey) |
| Lead time | Within 90 days of order |
| Minimum order | May apply — confirm on quote |
| Documentation | Source documentation provided on all orders |
Characteristics decoded from the federal cataloging record for this flat washer. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Hardness Rating | 33.0 Rockwell C Minimum And 38.0 Rockwell C Maximum |
|---|---|
| Material | Steel Comp 4130 Or Steel Comp 4140 Or Steel Comp 8640 Or Steel Comp 8740 Overall |
| Surface Treatment | Cadmium And Chromate Overall |
| Thickness | 0.011 Inches Minimum And 0.025 Inches Maximum |
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.
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 $0.52, this item sits well below the class median of $8.76 — commodity hardware usually bought in volume.
Stock activity. This item has appeared once in our supplier stock feed, most recently listed 2026-07-10, with a lot quantity of 450 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.
Typical applications. Paired with screws, bolts, and studs across every mechanical assembly; washers used for load distribution, spacing, and vibration resistance.
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.
NSN 5310-00-728-9957 is supplied by Quick Brown Fox Solutions as a stock resale item. For custom-manufactured or prototype parts to your print, see our U.S.-based CNC machining services.
Country of origin: Türkiye (Turkey). Turkey is a NATO ally and a normal-trade-relations partner of the United States, and Turkish-origin end items are eligible for a wide range of U.S. federal and DLA procurements.
TAA note: Turkey is not a Trade Agreements Act (TAA) designated country, so these items are generally not eligible for TAA-covered solicitations. They are offerable under the Buy American Act and many non-TAA DLA buys. Buyers are responsible for confirming the origin requirements of their specific solicitation.
Full country-of-origin and source documentation is provided with every order. Fulfillment within 90 days of order. Minimum order may apply.
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