The Piston,seal, cataloged under National Stock Number 4320-01-137-1867, is classified within Federal Supply Class 4320 (Power and Hand Pumps) of the Pumps and Compressors group. The manufacturer of record is Parker-Hannifin Corporation Div Engineered Polymer Systems Division (eps). Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4320-01-137-1867 |
| Primary Part Number | 18700500 |
| Item Name | Piston,seal |
| FSC / FSG | 4320 / 43 — Power and Hand Pumps |
| Manufacturer | Parker-Hannifin Corporation Div Engineered Polymer Systems Division (eps) |
| Status | ACTIVE |
| General Characteristics Item Description | PISTON OD 0.500 IN.,0.187 IN. H,0.875 IN. OD 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 |
|---|---|
| 18700500 PRIMARY | Parker-Hannifin Corporation Div Engineered Polymer Systems Division (eps) (USA) |
| 787AS273 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| Reference | Meaning |
|---|---|
| 18700500 | 5/9 Secondary reference Parker-Hannifin Corp Div O-Ring Division |
NSN 4320-01-137-1867 is a Piston,seal, manufactured by Parker-Hannifin Corporation Div Engineered Polymer Systems Division (eps), classified under FSC 4320, Power and Hand Pumps. Status: active.
NSN 4320-01-137-1867 has 2 manufacturer part numbers on file: 18700500 (Parker-Hannifin Corporation Div Engineered Polymer Systems Division (eps)), 787AS273 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 18700500: General Characteristics Item Description: PISTON OD 0.500 IN.,0.187 IN. H,0.875 IN. OD 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.