The Blanking Plate Assembly, cataloged under National Stock Number 4820-01-121-7521, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace. 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 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 | 4820-01-121-7521 |
| Primary Part Number | 29103-001 |
| Item Name | Blanking Plate Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
| Status | ACTIVE |
| Furnished Items and Quantity | 4 CAP SCREW AND 6 DRIVESCREW AND 1 NAME PLATE AND 1 TRADEMARK AND 4 WASHER |
| Port Quantity | 4 |
| Surface Treatment Document and Classification | MIL-A-8625, TYPE I, CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE |
| Valve Model Number for Which Designed | HS 512 AND HS 513 |
| Material Document and Classification | QQ-A-225/8, 6061-T651 FED SPEC SINGLE MATERIAL RESPONSE |
| Surface Treatment | ANODIZE |
| Material | ALUMINUM ALLOY 6061 |
| 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 |
|---|---|
| 29103-001 PRIMARY | Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace (USA) |
NSN 4820-01-121-7521 is a Blanking Plate Assembly, manufactured by Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-121-7521 has 1 manufacturer part number on file: 29103-001 (Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-547-2810. Verify interchangeability with system specifications before substitution.
Key specifications for 29103-001: Furnished Items and Quantity: 4 CAP SCREW AND 6 DRIVESCREW AND 1 NAME PLATE AND 1 TRADEMARK AND 4 WASHER; Overall Height: 1.250 INCHES NOMINAL IN; Port Quantity: 4; Surface Treatment Document and Classification: MIL-A-8625, TYPE I, CLASS 1 MIL SPEC SINGLE TREATMENT RESPONSE. 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.