The Seat,valve, cataloged under National Stock Number 4820-01-286-4526, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Natural Gas Solutions North America Llc Div Industrial Products Group. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-286-4526 |
| Primary Part Number | TB-1277 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Natural Gas Solutions North America Llc Div Industrial Products Group |
| Status | ACTIVE |
| Flange Diameter | 0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN |
| Body Inside Diameter | 0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.750 INCHES THIRD THREADED PORTION IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 16 SINGLE THREADED PORTION |
| Material | STEEL COMP 316 SEAT |
| Seating Surface Shape | ANGULAR |
| 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 |
|---|---|
| TB-1277 PRIMARY | Natural Gas Solutions North America Llc Div Industrial Products Group (USA) |
| Reference | Meaning |
|---|---|
| TB-1277 | 3/9 Design control — primary reference Texsteam Inc Dba Txt or Rcs or Texsteam |
NSN 4820-01-286-4526 is a Seat,valve, manufactured by Natural Gas Solutions North America Llc Div Industrial Products Group, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-286-4526 has 1 manufacturer part number on file: TB-1277 (Natural Gas Solutions North America Llc Div Industrial Products Group).
Key specifications for TB-1277: Flange Diameter: 0.739 INCHES MINIMUM AND 0.748 INCHES MAXIMUM IN; Body Inside Diameter: 0.437 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN; Nominal Thread Size: 0.750 INCHES THIRD THREADED PORTION IN; Thread Class: 2A SINGLE THREADED PORTION A. 7 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.