Part Number
Tube Reducer · MS (Military Standard) · NSN 4730-00-706-8711
| Part number | MS51534A6-4 |
|---|---|
| Specification family | MS (Military Standard) |
| Item name | Tube Reducer |
| Alternate references | MIL-DTL-18866; MIL-F-18866; MS51534B6-4; 6-4TRBTX-S; 6-4-37TR; 883FS3-8X1-4 |
| Unit of issue | EA |
| Cross-referenced NSN | 4730-00-706-8711 |
| Federal Supply Class (FSC) | 4730 — Fittings and Specialties; Hose, Pipe, and Tube |
| Unit price (USD) | $8.76 |
| 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 reducer. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Material | Steel Overall |
|---|---|
| Thread Class | 2A 2Nd End |
| Thread Class | 2B 1St End |
| Thread Series Designator | Unf All Ends |
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 concentric steel tube reducer with flared and threaded connections for tubes 0.250 to 0.375 inches in diameter.
Reading the part number. MS51534A6-4 breaks down as MS51534 — the Military Standard sheet that fixes the part's design — plus the dash/suffix code A6-4, which selects the exact size, material, or finish variant from the tables on that standard. Two parts sharing the MS51534 base are the same design in different variants.
Price in context. Across the 317 items we currently stock in FSC 4730 (Fittings and Specialties; Hose, Pipe, and Tube), published unit prices run from $0.38 to $11,915.64. At $8.76, this item sits well below the class median of $26.28 — commodity hardware usually bought in volume.
Who orders MS51534A6-4. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 4730-00-706-8711. 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. MS/AN flare and flareless fittings, SAE J514, MIL-DTL; steel, stainless, brass, and aluminum.
Need this part modified, or a similar part made to your print? See our U.S.-based CNC machining services and aerospace machining capability.
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.
Items are supplied as stock mil-spec / commercial hardware with source documentation and country-of-origin paperwork on every order. Parts are not supplied with an FAA Form 8130-3 airworthiness tag unless expressly stated on the quote. Buyers installing hardware on certificated aircraft are responsible for acceptance under their own maintenance program, repair station procedures, or owner/operator authority.
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