The Valve,ball, cataloged under National Stock Number 4820-01-459-4893, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Nil-Cor, Llc. Government technical data includes 16 specifications, 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-459-4893 |
| Primary Part Number | 6983491-051 |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nil-Cor, Llc |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 HANDLE |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 4.750 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Style Designator | STRAIGHT THRU FLANGED ENDS |
| Bolt Hole Nominal Diameter | 0.688 INCHES ALL ENDS IN |
| Valve Size | 2.000 INCHES IN |
| Nominal Outside Diameter | 6.000 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 4 ALL ENDS |
| Face to Face Distance | 4.000 INCHES IN |
| Material | GLASS FIBER BODY |
| Material | GLASS FIBER BODYUNABLE TO DECODE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 4.000 INCHES ALL ENDS IN |
| Reference Number Differentiating Characteristics | AS DIFFERENTIATED BY NON-ASBESTOS |
| 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 |
|---|---|
| 6983491-051 | Nil-Cor, Llc (USA) |
| Reference | Meaning |
|---|---|
| 6983491-051 NON-ASBESTOS | 5/1 Secondary reference Naval Sea Systems Command |
| 6983491-051 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 6983491-051 AB | 5/9 Secondary reference Naval Sea Systems Command |
| 6983491 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-459-4893 is a Valve,ball, manufactured by Nil-Cor, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-459-4893 has 1 manufacturer part number on file: 6983491-051 (Nil-Cor, Llc).
Key specifications for 6983491-051: Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 HANDLE; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 4.750 INCHES ALL ENDS IN. 16 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.