Part Number
Preformed Packing · Military specification (M-prefix) · NSN 5331-01-010-2421
| Part number | M25988/1-137 |
|---|---|
| Specification family | Military specification (M-prefix) |
| Item name | Preformed Packing |
| Alternate references | MIL-DTL-25988/1; MIL-R-25988/1; 102A10006-03; L0677 2-137; 2-137L449-65; 2-137L998-70 |
| Unit of issue | EA |
| Cross-referenced NSN | 5331-01-010-2421 |
| Federal Supply Class (FSC) | 5331 — O-Rings |
| Unit price (USD) | $1.40 |
| 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 |
Precision elastomeric sealing rings of circular cross-section used for static and dynamic sealing in grooves and glands.
Reading the part number. M25988/1-137 is a military-specification slash-sheet number: it points to slash sheet 1 of MIL spec 25988, and the remaining characters (137) encode the size, material, and finish options that sheet defines. Ordering by this number pins down the exact variant of the preformed packing.
Price in context. Across the 594 items we currently stock in FSC 5331 (O-Rings), published unit prices run from $0.14 to $3,504.60. At $1.40, this item sits well below the class median of $5.25 — commodity hardware usually bought in volume.
Who orders M25988/1-137. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5331-01-010-2421. 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. AS568 dash sizes, MIL-P-5510 / SAE AS5857; nitrile, fluorocarbon (Viton), EPDM, and silicone compounds.
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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