The Idler Assembly, cataloged under National Stock Number 4320-00-028-3868, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Tuthill Corporation Dba Tuthill Pump Group. Government technical data includes 1 specification, 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 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 | 4320-00-028-3868 |
| Primary Part Number | 4M5 |
| Item Name | Idler Assembly |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Tuthill Corporation Dba Tuthill Pump Group |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL; 7 TEETH; 2.594IN. MAJOR DIA; 1.875 IN. MINOR DIA; 1.375 IN. THK; 1.000 IN. ID; BRASS BEARING ON ID IN |
| 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 |
|---|---|
| 4M5 PRIMARY | Tuthill Corporation Dba Tuthill Pump Group (USA) |
NSN 4320-00-028-3868 is a Idler Assembly, manufactured by Tuthill Corporation Dba Tuthill Pump Group, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-028-3868 has 1 manufacturer part number on file: 4M5 (Tuthill Corporation Dba Tuthill Pump Group).
1 possible match (shared part number, not a government interchangeability claim): 5985-01-288-0623. Verify interchangeability with system specifications before substitution.
Key specifications for 4M5: General Characteristics Item Description: STEEL; 7 TEETH; 2.594IN. MAJOR DIA; 1.875 IN. MINOR DIA; 1.375 IN. THK; 1.000 IN. ID; BRASS BEARING ON ID IN. 1 specification is 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.