The Bearing,sleeve, cataloged under National Stock Number 3120-00-126-5437, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Siemens Energy, Inc.. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-00-126-5437 |
| Primary Part Number | H556 |
| Item Name | Bearing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Siemens Energy, Inc. |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES OVERALL |
| Corner Shape | SQUARE INSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | SQUARE LEFT FLANGE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE INSIDE LEFT CORNER |
| Corner Shape | UNDERCUT LEFT FLANGE BODY CORNER |
| Flange Outside Diameter | 3.6250 INCHES NOMINAL IN |
| Body Outside Diameter | 3.2430 INCHES MINIMUM AND 3.2450 INCHES MAXIMUM IN |
| Style Designator | SOLID, EXTERNAL FLANGE ONE END |
| Material Document and Classification | QQ-C-390,ALLOY B1 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 2.5310 INCHES MINIMUM AND 2.5410 INCHES MAXIMUM IN |
| Flange Width | 0.4960 INCHES MINIMUM AND 0.4980 INCHES MAXIMUM IN |
| Material | COPPER ALLOY 842 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| H556 PRIMARY | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| G10075PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
| G7042PC49 | 5/9 Secondary reference Siemens Energy, Inc. |
| G8721PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
| G14673PC36 | 5/9 Secondary reference Siemens Energy, Inc. |
| G8097PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
| G14671PC36 | 5/9 Secondary reference Siemens Energy, Inc. |
| G7045PC49 | 5/9 Secondary reference Siemens Energy, Inc. |
| G8095PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
| G10077PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
| G8719PC35 | 5/9 Secondary reference Siemens Energy, Inc. |
NSN 3120-00-126-5437 is a Bearing,sleeve, manufactured by Siemens Energy, Inc., classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-00-126-5437 has 1 manufacturer part number on file: H556 (Siemens Energy, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 5310-00-857-4948, 4730-01-688-8993. Verify interchangeability with system specifications before substitution.
Key specifications for H556: Surface Finish: 125.0 MICROINCHES OVERALL; Corner Shape: SQUARE INSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE RIGHT CORNER; Corner Shape: SQUARE OUTSIDE LEFT CORNER. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.