Part Number
Self-Aligning Plain Bearing · AS (SAE Aerospace Standard) · NSN 3120-00-165-5958
| Part number | AS21155-MS21155S16 |
|---|---|
| Specification family | AS (SAE Aerospace Standard) |
| Item name | Self-Aligning Plain Bearing |
| Alternate references | AS21155; MS21155S16 |
| Unit of issue | EA |
| Cross-referenced NSN | 3120-00-165-5958 |
| Federal Supply Class (FSC) | 3120 — Bearings, Plain, Unmounted |
| Unit price (USD) | $157.71 |
| 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 self-aligning plain bearing. Confirm controlling dimensions against your drawing or standard sheet before ordering.
| Hardness Rating | 27.0 Rockwell C Minimum Outer Race Member And 36.0 Rockwell C Maximum Outer Race Member |
|---|---|
| Hardness Rating | 27.0 Rockwell C Minimum Inner Member And 36.0 Rockwell C Maximum Inner Member |
| Material | Steel Comp 4340 Outer Race Member Or Steel Comp E4340 Outer Race Member Or Steel Comp 4130 Outer Race Member Or Steel Comp 8630 Outer Race Member |
| Material | Steel Comp E52100 Inner Member Or Steel Comp 440C Inner Member |
| Surface Treatment | Chromium Inner Member |
| Surface Treatment | Chromium Outer Race Member |
Plain (journal/sleeve) bearings, bushings, and bearing inserts that support loads through a sliding rather than rolling interface.
Reading the part number. AS21155-MS21155S16 breaks down as AS21155 — the SAE Aerospace Standard that fixes the part's design — plus the dash/suffix code MS21155S16, which selects the exact size, material, or finish variant from the tables on that standard. Two parts sharing the AS21155 base are the same design in different variants.
Price in context. Across the 67 items we currently stock in FSC 3120 (Bearings, Plain, Unmounted), published unit prices run from $3.85 to $6,750.00. At $157.71, this item sits above the class median of $87.61.
Stock activity. This item has appeared once in our supplier stock feed, most recently listed 2026-07-10, with a lot quantity of 41 units. Listing activity is a practical signal of ongoing availability; confirm current stock and firm pricing on your quote.
Who orders AS21155-MS21155S16. Aircraft owners and MRO shops replacing standard hardware, machine shops and OEMs filling a bill of materials, and government contractors sourcing against NSN 3120-00-165-5958. 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. SAE and MIL bearing standards; bronze, composite, and lined bearings.
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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