Part Number
Retaining Ring · MS (Military Standard) · NSN 5325-00-878-1908
| Part number | MS16633-4031 |
|---|---|
| Specification family | MS (Military Standard) |
| Item name | Retaining Ring |
| Alternate references | MS16633-4031-X5133-31H; 5133-31-H; 1000-X31-SS2; X5133-31H |
| Unit of issue | EA |
| Cross-referenced NSN | 5325-00-878-1908 |
| Federal Supply Class (FSC) | 5325 — Fastening Devices |
| Unit price (USD) | $0.35 |
| 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 retaining ring. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Material | Steel Comp 632 |
|---|---|
| Inside Diameter | 0.243 Inches Nominal |
| Surface Treatment | Passivate |
Quick-release and specialty fastening hardware including grommets, eyelets, snap fasteners, turnlock (Dzus/Camloc-type) fasteners, and retaining hardware.
Reading the part number. MS16633-4031 breaks down as MS16633 — the Military Standard sheet that fixes the part's design — plus the dash/suffix code 4031, which selects the exact size, material, or finish variant from the tables on that standard. Two parts sharing the MS16633 base are the same design in different variants.
Price in context. Across the 155 items we currently stock in FSC 5325 (Fastening Devices), published unit prices run from $0.18 to $1,752.30. At $0.35, this item sits well below the class median of $8.76 — commodity hardware usually bought in volume.
Who orders MS16633-4031. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 5325-00-878-1908. 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 and NAS series turnlock and grommet standards.
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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