The Tester,spring Resiliency, cataloged under National Stock Number 6635-00-490-3142, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ametek Inc.. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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.
| Parameter | Value |
|---|---|
| NSN | 6635-00-490-3142 |
| Primary Part Number | MST50 |
| Item Name | Tester,spring Resiliency |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| Manufacturer | Ametek Inc. |
| Status | ACTIVE |
| Load Receiver Type | HOOK |
| Scale Calibration | 0 TO 10 IN. IN |
| Mounting Method | TABLE |
| Scale Range | +0.0 TO 50.0 POUNDS LBS |
| Spring Type for Which Designed | COMPRESSION AND TENSION |
| Torque Indicating Wrench Usage Feature | NOT INCLUDED |
| Spring Maximum Outside Diameter Accommodated | 4.875 INCHES IN |
| Unit Type | MECHANICAL |
| Spring Travel Gage | INCLUDED |
| Scale Smallest Increment Graduation | 0.1 LB SMALLEST INCREMENT LBS |
| Spring Maximum Overall Free Length Accommodated | 12.000 INCHES IN |
| 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 |
NSN 6635-00-490-3142 is a Tester,spring Resiliency, manufactured by Ametek Inc., classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
NSN 6635-00-490-3142 has 2 manufacturer part numbers on file: PB4-50D (Link Engineering Co), MST50 (Ametek Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5210-01-170-1248. Verify interchangeability with system specifications before substitution.
Key specifications for MST50: Load Receiver Type: HOOK; Scale Calibration: 0 TO 10 IN. IN; Mounting Method: TABLE; Scale Range: +0.0 TO 50.0 POUNDS LBS. 13 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.