The Valve,ball, cataloged under National Stock Number 4820-01-643-9990, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Nibco Inc Chemtrol Div. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-643-9990 |
| Primary Part Number | NL99K4A |
| Item Name | Valve,ball |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nibco Inc Chemtrol Div |
| Status | ACTIVE |
| Material Document and Classification | ASTM 351 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Valve Size | 1.000 INCHES IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE PACKING |
| Material | STEEL COMP 304 FLOW CONTROL DEVICE |
| Material | STEEL COMP 316 STEM |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE SEAT |
| Material | STEEL STAINLESS - USE STB000 BODY |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| NL99K4A PRIMARY | Nibco Inc Chemtrol Div (USA) |
| Reference | Meaning |
|---|---|
| T-595-S6-R-66-LL | D/9 Drawing number reference only Nibco Inc Chemtrol Div |
NSN 4820-01-643-9990 is a Valve,ball, manufactured by Nibco Inc Chemtrol Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-643-9990 has 1 manufacturer part number on file: NL99K4A (Nibco Inc Chemtrol Div).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-643-9992. Verify interchangeability with system specifications before substitution.
Key specifications for NL99K4A: Material Document and Classification: ASTM 351 ASSN STD SINGLE MATERIAL RESPONSE BODY; Valve Size: 1.000 INCHES IN; Part Name Assigned by Controlling Agency: THREE-PIECE STAINLESS STEEL BALL VALVE; Material: PLASTIC POLYTETRAFLUOROETHYLENE PACKING. 8 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.