The O-Ring, cataloged under National Stock Number 5331-01-526-5325, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5331-01-526-5325 |
| Primary Part Number | 4KK514 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Center Hole Diameter | 17.9 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| 5-256-N552-9 | Parker-Hannifin Corp Div O-Ring Division (USA) |
| 4KK514 PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 4KK514 | 3/9 Design control — primary reference Oshkosh Corp |
NSN 5331-01-526-5325 is a O-Ring, manufactured by Oshkosh Defense Llc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-526-5325 has 2 manufacturer part numbers on file: 5-256-N552-9 (Parker-Hannifin Corp Div O-Ring Division), 4KK514 (Oshkosh Defense Llc).
Key specifications for 4KK514: Special Features: NHA IS NIPPLE, PIPE, P/N 499-1662;SECTION MEASUREMENT IS 2.62 MM NOMINAL;FOR BSPP THREAD SIZE 1/2 MM; Center Hole Diameter: 17.9 MILLIMETERS NOMINAL MM; Part Name Assigned by Controlling Agency: O-RING; End Item Identification: HIMARS, RSV, MK37, 2320-01-504-5218. 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.