The Piston,pump, cataloged under National Stock Number 4320-00-705-7841, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-00-705-7841 |
| Primary Part Number | 7703650 |
| Item Name | Piston,pump |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Integral Connecting Rod | NOT INCLUDED |
| Retaining Ring Groove | NOT INCLUDED |
| Surface Finish | FINISHED |
| Diameter | 0.993 INCHES NOMINAL IN |
| Pin | NOT INCLUDED |
| Oil Groove | INCLUDED |
| Head Style | HUMP |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | STANDARD |
| Ring | NOT INCLUDED |
| Pin Hole Bushing | NOT INCLUDED |
| Skirt Type | SEMISPLIT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 4320-00-705-7841 is a Piston,pump, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-705-7841 has 3 manufacturer part numbers on file: 550696 (Renk America Llc Div Renk America), 550696 (Satair A/s), 7703650 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 4820-00-770-3295. Verify interchangeability with system specifications before substitution.
Key specifications for 7703650: Overall Height: 0.750 INCHES NOMINAL IN; Integral Connecting Rod: NOT INCLUDED; Retaining Ring Groove: NOT INCLUDED; Surface Finish: FINISHED. 12 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.