The Contact,electrical, cataloged under National Stock Number 5999-00-421-2057, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Eaton Corp Opns & Technical Center. Government technical data includes 12 specifications, 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. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5999-00-421-2057 |
| Primary Part Number | 21-387 |
| Item Name | Contact,electrical |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Eaton Corp Opns & Technical Center |
| Status | ACTIVE |
| Voltage Rating in Volts | 125.0 DC |
| Mounting Facility Quantity | 1 |
| Precious Material | SILVER |
| Mounting Method | UNTHREADED HOLE(S) |
| Style Designator | LEAF TAP CONTACT W/ ROUND FIXED POINT |
| Precious Material and Weight | 1.105 SILVER GRAINS, TROY |
| Surface Treatment | SILVER BODY |
| Surface Treatment | SILVER CONTACT |
| Precious Material and Location | EXTERNAL SURFACES AND BODY AND CONTACT SILVER |
| Material | SILVER BODY |
| Material | SILVER CONTACT |
| Current Rating in Amps | 10.0 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Shelf Life Code | 0 |
| Criticality Code | X |
| Unit of Issue | EA |
| Acquisition advice code | Y |
| Part Number | Manufacturer |
|---|---|
| 21-387 PRIMARY | Eaton Corp Opns & Technical Center (USA) |
| 81970W1ITEM55 | Eaton Corp Opns & Technical Center (USA) |
NSN 5999-00-421-2057 is a Contact,electrical, manufactured by Eaton Corp Opns & Technical Center, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-00-421-2057 has 2 manufacturer part numbers on file: 21-387 (Eaton Corp Opns & Technical Center), 81970W1ITEM55 (Eaton Corp Opns & Technical Center).
3 possible matches (shared part number, not a government interchangeability claim): 6665-01-107-1168, 5355-01-308-4633, 1240-01-577-3150. Verify interchangeability with system specifications before substitution.
Key specifications for 21-387: Voltage Rating in Volts: 125.0 DC; Overall Height: 0.250 INCHES NOMINAL IN; Mounting Facility Quantity: 1; Precious Material: SILVER. 12 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.