The Insert,screw Thread, cataloged under National Stock Number 5325-01-644-5956, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-644-5956 |
| Item Name | Insert,screw Thread |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Status | ACTIVE |
| Length | 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Thread Length | 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Insert Size | .2500-20UNC-2A A |
| Style Designator | KEYLOCK |
| Material Document and Classification | AMS5640, TYPE 1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A582/582M ASSN STD 1ST MATERIAL RESPONSE OR AMS5640, TYPE 2 ASSN STD 2ND MATERIAL RESPONSE OR AMS5738 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A582/582M ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Internal Thread Relief Depth | 0.060 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.2500 INCHES IN |
| Full Internal Thread Length | 0.180 INCHES NOMINAL IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| NAS1394C08L | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-644-5956 is a Insert,screw Thread, classified under FSC 5325, Fastening Devices. Status: active.
Key specifications for 5325-01-644-5956: Length: 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN; Thread Length: 0.235 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN; Insert Size: .2500-20UNC-2A A; Style Designator: KEYLOCK. 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.