The Pump Subassembly,rotary, cataloged under National Stock Number 4320-00-770-0293, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4320-00-770-0293 |
| Primary Part Number | 261838 |
| Item Name | Pump Subassembly,rotary |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
| Status | ACTIVE |
| Major Components | SHAFT 1; ROTOR 1; TAPER PIN 2 |
| Mounting Configuration | PLACED INSIDE PUMP |
| 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 |
|---|---|
| 261838 PRIMARY | Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer (USA) |
| Reference | Meaning |
|---|---|
| E2841PC13 | 5/9 Secondary reference Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer |
NSN 4320-00-770-0293 is a Pump Subassembly,rotary, manufactured by Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-770-0293 has 1 manufacturer part number on file: 261838 (Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer).
2 possible matches (shared part number, not a government interchangeability claim): 4320-01-351-6574, 6515-01-612-7611. Verify interchangeability with system specifications before substitution.
Key specifications for 261838: Major Components: SHAFT 1; ROTOR 1; TAPER PIN 2; Overall Length: 16.000 INCHES NOMINAL IN; Overall Width: 6.372 INCHES MAXIMUM IN; Special Features: ALL COMPONENTS BRONZE; ASSY USED IN 3 IN. PUMPS; ROTOR IS PRESS FITTED & PINNED TO SHAFT IN. 2 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.