The Seat,valve, cataloged under National Stock Number 4820-01-535-8257, 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 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-535-8257 |
| Primary Part Number | TF42002 FC |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Nibco Inc Chemtrol Div |
| Status | ACTIVE |
| Material Document and Classification | ASTM A126 CLASS B ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Material | IRON OVERALL |
| 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 |
|---|---|
| TF42002 FC | Nibco Inc Chemtrol Div (USA) |
| Reference | Meaning |
|---|---|
| TF42002 FC | 3/9 Design control — primary reference Nibco Inc |
| TF42002 FC | 5/9 Secondary reference Nibco Inc |
NSN 4820-01-535-8257 is a Seat,valve, manufactured by Nibco Inc Chemtrol Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-535-8257 has 1 manufacturer part number on file: TF42002 FC (Nibco Inc Chemtrol Div).
Key specifications for TF42002 FC: Material Document and Classification: ASTM A126 CLASS B ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Part Name Assigned by Controlling Agency: SEAT RING; End Item Identification: 2-1/2 INCH IRON GATE VALVE 4820-01-535-8084 IN; Material: IRON OVERALL. 2 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.