The Felt Ring,preformed, cataloged under National Stock Number 4320-00-987-6085, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4320-00-987-6085 |
| Primary Part Number | 4J981 |
| Item Name | Felt Ring,preformed |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| General Characteristics Item Description | FELT; 1.438 IN. OD; 1.062 IN. ID; 0.188 IN. THK 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 |
|---|---|
| 224476 | Eaton Aerospace, Llc Dba Jackson South (USA) |
| 4J981 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| 19809 | Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp. (USA) |
| Reference | Meaning |
|---|---|
| 224476 | 5/9 Secondary reference Handy & Harman |
| 9030770 | 5/9 Secondary reference U.S. Government activity |
NSN 4320-00-987-6085 is a Felt Ring,preformed, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-00-987-6085 has 3 manufacturer part numbers on file: 224476 (Eaton Aerospace, Llc Dba Jackson South), 4J981 (Caterpillar Inc Div Caterpillar Defense), 19809 (Tiffin Parts, L.l.c. Div Subsidiary of Pettibone Corp.).
2 possible matches (shared part number, not a government interchangeability claim): 5365-00-988-7581, 5305-01-668-6946. Verify interchangeability with system specifications before substitution.
Key specifications for 4J981: General Characteristics Item Description: FELT; 1.438 IN. OD; 1.062 IN. ID; 0.188 IN. THK 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.