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Tube Cap — Fittings and Specialties; Hose, Pipe, and Tube (FSC 4730) · Part No. MS51532B16S
| National Stock Number | 4730-00-839-1201 |
|---|---|
| Item name | Tube Cap |
| FLIS item name | Cap, Tube |
| Part number (commercial reference) | MS51532B16S |
| Alternate references | MIL-DTL-18866; MIL-F-18866; CAP/JIC-16/SS-TETHERED; 16FNTXSS; 1HB225 |
| Unit of issue | EA |
| NIIN | 008391201 |
| NIIN assigned by | United States (NCB code 00) |
| Federal Supply Class (FSC) | 4730 — Fittings and Specialties; Hose, Pipe, and Tube |
| Federal Supply Group (FSG) | 47 — Pipe, Tubing, Hose, and Fittings |
| Unit price (USD) | $10.52 |
| 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 tube cap. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Material | Steel Corrosion Resisting Overall |
|---|---|
| Surface Treatment | Passivate Overall |
| Thread Class | 2B Internal |
| Thread Series Designator | Un Internal |
| Thread Quantity Per Inch | 12 Internal |
Fluid-line connection hardware including tube and pipe fittings, adapters, elbows, tees, unions, couplings, nipples, and bushings used to join, branch, and terminate hose, pipe, and tube.
A tethered stainless steel tube cap with a 37-degree flare seat.
Price in context. Across the 342 items we currently stock in FSC 4730 (Fittings and Specialties; Hose, Pipe, and Tube), published unit prices run from $0.38 to $12,000.00. At $10.52, this item sits well below the class median of $26.28 — commodity hardware usually bought in volume.
Typical applications. Hydraulic, pneumatic, fuel, and coolant lines on vehicles, aircraft, and ground support equipment.
Applicable standards. MS/AN flare and flareless fittings, SAE J514, MIL-DTL; steel, stainless, brass, and aluminum.
NSN 4730-00-839-1201 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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