The Sleeve,shaft,pump, cataloged under National Stock Number 4320-00-121-0441, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Pentair Pump Group, Inc. Dba Fairbanks Morse Pump. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 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 | 4320-00-121-0441 |
| Primary Part Number | K4B14B |
| Item Name | Sleeve,shaft,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Pentair Pump Group, Inc. Dba Fairbanks Morse Pump |
| Status | ACTIVE |
| Corner Shape | SQUARE INSIDE RIGHT CORNER |
| Corner Shape | CHAMFERED LEFT FLANGE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE LEFT FLANGE BODY CORNER |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE OUTSIDE LEFT CORNER |
| Corner Shape | SQUARE INSIDE LEFT CORNER |
| Flange Outside Diameter | 2.2500 INCHES NOMINAL IN |
| Body Outside Diameter | 1.8750 INCHES MINIMUM AND 2.1250 INCHES MAXIMUM IN |
| Hardness Rating | 265.0 BRINELL STANDARD NOMINAL OVERALL |
| Style Designator | SOLID, EXTERNAL FLANGE ONE END |
| Material Document and Classification | QQ-N-286 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Features Provided | CASEHARDENED |
| Body Inside Diameter | 1.3770 INCHES NOMINAL IN |
| Flange Width | 0.3750 INCHES MINIMUM AND 0.4062 INCHES MAXIMUM IN |
| Material | NICKEL ALLOY K-500 OVERALL |
| Keyway Dimension | 0.3750 INCHES NOMINAL INTERNAL KEYWAY LENGTH IN |
| Keyway Dimension | 0.1230 INCHES NOMINAL INTERNAL KEYWAY DEPTH IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4320-00-121-0441 is a Sleeve,shaft,pump, manufactured by Pentair Pump Group, Inc. Dba Fairbanks Morse Pump, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-121-0441 has 2 manufacturer part numbers on file: K4B14B (Pentair Pump Group, Inc. Dba Fairbanks Morse Pump), 99K4BH (Pentair Pump Group, Inc. Dba Fairbanks Morse Pump).
3 possible matches (shared part number, not a government interchangeability claim): 4320-00-868-9575, 4320-01-045-3555, 4320-01-045-3588. Verify interchangeability with system specifications before substitution.
Key specifications for K4B14B: Corner Shape: SQUARE INSIDE RIGHT CORNER; Corner Shape: CHAMFERED LEFT FLANGE OUTSIDE RIGHT CORNER; Corner Shape: SQUARE LEFT FLANGE BODY CORNER; Corner Shape: SQUARE OUTSIDE RIGHT CORNER. 17 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.