The Switch Subassembly, cataloged under National Stock Number 5930-00-042-5542, is classified within Federal Supply Class 5930 (Switches) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Spencer Industries Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5930-00-042-5542 |
| Primary Part Number | SM-B-597973 |
| Item Name | Switch Subassembly |
| FSC / FSG | 5930 / 59 — Switches |
| Manufacturer | Spencer Industries Inc |
| 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 |
|---|---|
| SM-B-597973 | Spencer Industries Inc (USA) |
| 597974 | Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited (CAN) |
| Reference | Meaning |
|---|---|
| SMB597974 | C/1 Advisory reference — outside the item-of-supply concept Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited |
| SM-B-597973 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5930-00-042-5542 is a Switch Subassembly, manufactured by Spencer Industries Inc, classified under FSC 5930, Switches. Status: active.
NSN 5930-00-042-5542 has 2 manufacturer part numbers on file: SM-B-597973 (Spencer Industries Inc), 597974 (Ultra Electronics Maritime Systems Inc Div Subsidiary of Ultra Electronics Holdings Limited).
Key specifications for SM-B-597973: Special Features: MAJ COMP: SWITCH ACTUATOR ARM 1, CONTROL CAM 1, SOCKET HEAD CAP SCREWS 2, GRADE B SEALING COMPOUND AS REQUIRED. 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.