The Seat,valve, cataloged under National Stock Number 4820-01-231-4126, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Crane Co Div Valve Div. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-231-4126 |
| Primary Part Number | 32813-143 1/2U PIECE 8A-3IN |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Crane Co Div Valve Div |
| Status | ACTIVE |
| Flange Seat to Disk End Height | 0.630 INCHES NOMINAL IN |
| Flange Diameter | 3.875 INCHES NOMINAL IN |
| Thread Length | 0.650 INCHES NOMINAL SINGLE THREADED PORTION IN |
| Style Designator | THREADED FLANGED |
| Material Document and Classification | ASTM A567 GR.12 ASSN STD SINGLE MATERIAL RESPONSE SEAT |
| Body Inside Diameter | 2.625 INCHES NOMINAL IN |
| Nominal Thread Size | 3.515 INCHES SINGLE THREADED PORTION IN |
| Under Flange Height | 0.810 INCHES NOMINAL IN |
| Thread Class | 2A SINGLE THREADED PORTION A |
| Thread Quantity Per Inch | 11-1/2 SINGLE THREADED PORTION |
| Material | COBALT ALLOY BODY |
| Seat Angle in Deg | 15.000 NOMINAL |
| Thread Series Designator | UNS SINGLE THREADED PORTION |
| 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 |
|---|---|
| 32813-143 1/2U PIECE 8A-3IN PRIMARY | Crane Co Div Valve Div (USA) |
| Reference | Meaning |
|---|---|
| B-104912 | D/9 Drawing number reference only Crane Co Div Valve Div |
| 32813 | D/9 Drawing number reference only Crane Co Div Valve Div |
NSN 4820-01-231-4126 is a Seat,valve, manufactured by Crane Co Div Valve Div, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-231-4126 has 1 manufacturer part number on file: 32813-143 1/2U PIECE 8A-3IN (Crane Co Div Valve Div).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-231-4137, 4820-01-231-4166. Verify interchangeability with system specifications before substitution.
Key specifications for 32813-143 1/2U PIECE 8A-3IN: Flange Seat to Disk End Height: 0.630 INCHES NOMINAL IN; Flange Diameter: 3.875 INCHES NOMINAL IN; Thread Length: 0.650 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 14 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.