The Insulator,washer, cataloged under National Stock Number 5970-01-087-8377, is classified within Federal Supply Class 5970 (Electrical Insulators and Insulating Materials) of the Electrical and Electronic Equipment Components group. The manufacturer of record is B.c. Systems Inc. Dba Bc Systems Inc. Government technical data includes 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5970-01-087-8377 |
| Primary Part Number | S/B4010-178-1 |
| Item Name | Insulator,washer |
| FSC / FSG | 5970 / 59 — Electrical Insulators and Insulating Materials |
| Manufacturer | B.c. Systems Inc. Dba Bc Systems Inc |
| Status | ACTIVE |
| Style Designator | ROUND, FLAT |
| Outside Diameter | 1.375 INCHES NOMINAL IN |
| Inside Diameter | 0.531 INCHES NOMINAL IN |
| Material | MICA OVERALL |
| 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 |
|---|---|
| S/B4010-178-1 PRIMARY | B.c. Systems Inc. Dba Bc Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 4010-178 | 5/9 Secondary reference Tempo Instrument Inc Defense Electronics Div |
| 4010-178-1 | 5/9 Secondary reference Tempo Instrument Inc Defense Electronics Div |
| 4010-178 | 3/1 Design control — primary reference B.c. Systems Inc. Dba Bc Systems Inc |
| S/B4010-178-1 | 5/9 Secondary reference Tempo Instrument Inc Defense Electronics Div |
NSN 5970-01-087-8377 is a Insulator,washer, manufactured by B.c. Systems Inc. Dba Bc Systems Inc, classified under FSC 5970, Electrical Insulators and Insulating Materials. Status: active.
NSN 5970-01-087-8377 has 1 manufacturer part number on file: S/B4010-178-1 (B.c. Systems Inc. Dba Bc Systems Inc).
Key specifications for S/B4010-178-1: Overall Height: 0.003 INCHES NOMINAL IN; Style Designator: ROUND, FLAT; Outside Diameter: 1.375 INCHES NOMINAL IN; Inside Diameter: 0.531 INCHES NOMINAL IN. 4 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.