The Isolator,gage, cataloged under National Stock Number 5985-01-221-6031, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Deltrol Corp Deltrol Controls Div. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5985-01-221-6031 |
| Primary Part Number | GI21S |
| Item Name | Isolator,gage |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Deltrol Corp Deltrol Controls Div |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| GI21S PRIMARY | Deltrol Corp Deltrol Controls Div (USA) |
| Reference | Meaning |
|---|---|
| G121S | 5/9 Secondary reference Deltrol Corp Deltrol Controls Div |
| GI-21-S | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5985-01-221-6031 is a Isolator,gage, manufactured by Deltrol Corp Deltrol Controls Div, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-221-6031 has 1 manufacturer part number on file: GI21S (Deltrol Corp Deltrol Controls Div).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-283-3178. Verify interchangeability with system specifications before substitution.
Key specifications for GI21S: End Item Identification: 2010-00-410-4442. 0 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.