National Stock Number
Recessed Washer — Nuts and Washers (FSC 5310) · Part No. 03A377F8
| National Stock Number | 5310-01-391-9112 |
|---|---|
| Item name | Recessed Washer |
| Part number (commercial reference) | 03A377F8 |
| Unit of issue | EA |
| NIIN | 013919112 |
| NIIN assigned by | United States (NCB code 01) |
| Federal Supply Class (FSC) | 5310 — Nuts and Washers |
| Federal Supply Group (FSG) | 53 — Hardware and Abrasives |
| Unit price (USD) | $22.50 |
| 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 recessed washer. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Material | Rubber Fluorosilicone Class Fq Sealing Element |
|---|---|
| Material | Steel Comp 4130 Body |
| Outside Diameter | 0.490 Inches Minimum And 0.510 Inches Maximum |
| Surface Treatment | Nickel Body |
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 $22.50, this item sits well above the class median of $8.76 — typical of assemblies and higher-value line items in this class.
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 5310-01-391-9112 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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