The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-596-1725, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Rosemount Aerospace Inc Dba Rosemount Aerospace Inc. Government technical data includes 18 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-596-1725 |
| Primary Part Number | C21449-2612-0938 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Rosemount Aerospace Inc Dba Rosemount Aerospace Inc |
| Status | ACTIVE |
| Width Across Flats | 0.140 INCHES NOMINAL IN |
| Head Height | 0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN |
| Fastener Length | 0.938 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS QQ-P-416, TYP II, CLS 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.190 INCHES NOMINAL IN |
| First Diameter From Head | 0.120 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | FILLISTER |
| Thread Direction | RIGHT-HAND |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.563 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.262 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| 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 |
|---|---|
| C21449-2612-0938 PRIMARY | Rosemount Aerospace Inc Dba Rosemount Aerospace Inc (USA) |
| Reference | Meaning |
|---|---|
| 114118-.938-AS-8 | 5/9 Secondary reference Accurate Screw Machine Corp Div Accurate Screw Machine Corporation |
NSN 5305-01-596-1725 is a Screw,externally Relieved Body, manufactured by Rosemount Aerospace Inc Dba Rosemount Aerospace Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-596-1725 has 1 manufacturer part number on file: C21449-2612-0938 (Rosemount Aerospace Inc Dba Rosemount Aerospace Inc).
Key specifications for C21449-2612-0938: Width Across Flats: 0.140 INCHES NOMINAL IN; Head Height: 0.159 INCHES MINIMUM AND 0.164 INCHES MAXIMUM IN; Fastener Length: 0.938 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS QQ-P-416, TYP II, CLS 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 18 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.