The Retainer,spring, cataloged under National Stock Number 4820-01-062-3837, 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 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-062-3837 |
| Primary Part Number | 20196-1081 |
| Item Name | Retainer,spring |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM ALLOY; ANODIZED; CONFIGURATION STEPPED DISC W/CENTER HOLE AND 4 UNIFORMLY SPACED ADDITIONAL HOLES; 1.651 IN. OD; 0.190 IN. THK; 0.331 IN. OVERALL; CENTER HOLE DIA 0.375 IN. W/COUNTERBORE 0.473 IN. DIA AND 0.091 IN. DEEP; 4 0.223 IN. DIA HOLES EQUALLY SPACED ON DISK FACE ON 0.790 IN. BOLT CIRCLE IN |
| 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 |
|---|---|
| 21820 FN 17 | Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace (USA) |
| 20196-1081 PRIMARY | Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 20435-001 | D/9 Drawing number reference only Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
| 20435-001 FIND 30 | 5/9 Secondary reference Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace |
NSN 4820-01-062-3837 is a Retainer,spring, manufactured by Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-062-3837 has 2 manufacturer part numbers on file: 21820 FN 17 (Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace), 20196-1081 (Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace).
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-062-8774, 5307-01-091-8128, 4810-01-093-0870. Verify interchangeability with system specifications before substitution.
Key specifications for 20196-1081: General Characteristics Item Description: ALUMINUM ALLOY; ANODIZED; CONFIGURATION STEPPED DISC W/CENTER HOLE AND 4 UNIFORMLY SPACED ADDITIONAL HOLES; 1.651 IN. OD; 0.190 IN. THK; 0.331 IN. OVERALL; CENTER HOLE DIA 0.375 IN. W/COUNTERBORE 0.473 IN. DIA AND 0.091 IN. DEEP; 4 0.223 IN. DIA HOLES EQUALLY SPACED ON DISK FACE ON 0.790 IN. BOLT CIRCLE IN. 1 specification is 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.