The Tester,spring, cataloged under National Stock Number 6635-01-534-4739, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. The manufacturer of record is Rsi, Inc. Dba Rsi Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Tester,spring |
| FSC / FSG | 6635 — Physical Properties Testing and Inspection (FSG 66) |
| Manufacturers | Rsi, Inc. Dba Rsi Inc (CAGE 1QMF6) |
| Parameter | Value |
|---|---|
| NSN | 6635-01-534-4739 |
| Primary Part Number | 071 |
| Item Name | Tester,spring |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| Manufacturer | Rsi, Inc. Dba Rsi Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 071 PRIMARY | Rsi, Inc. Dba Rsi Inc (USA) |
NSN 6635-01-534-4739 is a Tester,spring, manufactured by Rsi, Inc. Dba Rsi Inc, classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
NSN 6635-01-534-4739 has 1 manufacturer part number on file: 071 (Rsi, Inc. Dba Rsi Inc).
1 possible match (shared part number, not a government interchangeability claim): 4940-01-573-5784. Verify interchangeability with system specifications before substitution.
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.