The Tester,spring Resiliency, cataloged under National Stock Number 6635-01-643-1671, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. The manufacturer of record is Topac Inc. Government technical data includes 3 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6635-01-643-1671 |
| Primary Part Number | FB-20 |
| Item Name | Tester,spring Resiliency |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| Manufacturer | Topac Inc |
| Status | ACTIVE |
| Mounting Method | TABLE |
| Operation Method | MANUAL |
| Measurement Unit | POUND |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| FB-20 PRIMARY | Topac Inc (USA) |
NSN 6635-01-643-1671 is a Tester,spring Resiliency, manufactured by Topac Inc, classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
NSN 6635-01-643-1671 has 1 manufacturer part number on file: FB-20 (Topac Inc).
Key specifications for FB-20: Mounting Method: TABLE; Special Features: 20 LBF;0.2LBF RESOLUTION; Part Name Assigned by Controlling Agency: MANUAL PUSH/PULL FORCE GAUGES; Operation Method: MANUAL. 3 specifications are documented in the U.S. Government catalog.
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.