The Insert,screw Thread, cataloged under National Stock Number 5325-01-255-4140, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-255-4140 |
| Primary Part Number | MS51831A11 |
| Item Name | Insert,screw Thread |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Length | 1.375 INCHES NOMINAL IN |
| Insert Size | 1.375-12 UNF 2A A |
| Style Designator | KEYLOCK |
| Material Document and Classification | MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Internal Thread Relief Depth | 0.100 INCHES NOMINAL IN |
| Full Internal Thread Length | 1.275 INCHES NOMINAL IN |
| Material | STEEL COMP 4140 OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| MS51831A11 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| MS51831A111 | 4/1 Identification reference U.S. Government activity |
NSN 5325-01-255-4140 is a Insert,screw Thread, manufactured by Naval Sea Systems Command, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-255-4140 has 1 manufacturer part number on file: MS51831A11 (Naval Sea Systems Command).
Key specifications for MS51831A11: Length: 1.375 INCHES NOMINAL IN; Insert Size: 1.375-12 UNF 2A A; Style Designator: KEYLOCK; Material Document and Classification: MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 7 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.