The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-692-7172, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-692-7172 |
| Primary Part Number | NAS5321E4-4 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Heartland Precision Fasteners Inc |
| Status | ACTIVE |
| Fastener Length | 0.675 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS2700,METHOD1,CLASS4 NATIONAL STD/SPEC 1ST TREATMENT RESPONSE OR AMS-QQ-P-416, TYPE II, CLASS2 NATIONAL STD/SPEC 2ND TREATMENT RESPONSE OVERALL |
| Thread Length | 0.425 INCHES NOMINAL IN |
| Material Document and Classification | AMS5731 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS5732 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS5737 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.221 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OR CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORX |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.449 INCHES MINIMUM AND 0.507 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 |
|---|---|
| NAS5321E4-4 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| Reference | Meaning |
|---|---|
| NAS5321E4-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-692-7172 is a Screw,cap,socket Head, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-692-7172 has 1 manufacturer part number on file: NAS5321E4-4 (Heartland Precision Fasteners Inc).
Key specifications for NAS5321E4-4: Fastener Length: 0.675 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS2700,METHOD1,CLASS4 NATIONAL STD/SPEC 1ST TREATMENT RESPONSE OR AMS-QQ-P-416, TYPE II, CLASS2 NATIONAL STD/SPEC 2ND TREATMENT RESPONSE OVERALL; Thread Length: 0.425 INCHES NOMINAL IN; Material Document and Classification: AMS5731 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS5732 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OR AMS5737 NATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL. 17 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.