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Machine Bolt — Bolts (FSC 5306) · Part No. AS621-103
| National Stock Number | 5306-01-564-3378 |
|---|---|
| Item name | Machine Bolt |
| Part number (commercial reference) | AS621-103 |
| Alternate references | AS621-105; AS621-103-AS621-105 |
| Unit of issue | EA |
| NIIN | 015643378 |
| NIIN assigned by | United States (NCB code 01) |
| Federal Supply Class (FSC) | 5306 — Bolts |
| Federal Supply Group (FSG) | 53 — Hardware and Abrasives |
| Unit price (USD) | $876.15 |
| 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 machine bolt. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Fastener Length | 4.325 Inches Nominal |
|---|---|
| Head Style | Hexagon |
| Material | Cobalt Comp Mp-35-N Overall |
| Nominal Thread Diameter | 0.750 Inches |
| Thread Series Designator | Unjf |
| Thread Quantity Per Inch | 16 |
| Thread Class | 3A |
Externally threaded fasteners designed to be paired with a nut and used to hold two or more parts together, including hex bolts, structural bolts, eye bolts, U-bolts, plow bolts, and close-tolerance bolts.
Price in context. Across the 1,133 items we currently stock in FSC 5306 (Bolts), published unit prices run from $0.15 to $15,770.70. At $876.15, this item sits well above the class median of $21.03 — typical of assemblies and higher-value line items in this class.
Typical applications. Primary structural joints, chassis and frame assembly, engine mounts, and load-bearing connections where a through-bolt and nut are used.
Applicable standards. ASME B18.2.1, SAE J429 grades, ASTM A325/A490, MS/AN/NAS series; carbon, alloy, and corrosion-resistant steels with a range of plating and coating options.
NSN 5306-01-564-3378 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) — a DFARS qualifying country. Türkiye is a NATO ally with a reciprocal defense procurement agreement with the U.S. Department of Defense, making it a qualifying country under DFARS 225.003. On DoD and DLA solicitations, qualifying-country end products are evaluated without Buy American price penalties — they compete on par with domestic product — and DoD trade-agreements clauses (DFARS 252.225-7021) expressly accept qualifying-country end products.
Dollar thresholds. The Trade Agreements Act only applies to supply contracts at or above $174,000 (the WTO GPA threshold effective March 2026); below that — where the vast majority of hardware buys fall — the TAA does not apply at all. The main exclusion is civilian-agency solicitations at or above that threshold that restrict award to TAA designated-country products (Türkiye is not TAA-designated). 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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