The Screw,shoulder, cataloged under National Stock Number 5305-01-398-1302, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Ufc Aerospace Corp.. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-398-1302 |
| Primary Part Number | NAS1581F3T9X |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Ufc Aerospace Corp. |
| Status | ACTIVE |
| Fastener Length | 0.910 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Shoulder Length | 0.509 INCHES MINIMUM AND 0.529 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2041 INCHES MINIMUM AND 0.2051 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.363 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NAS1581 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 4140 OR STEEL COMP E4340 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.2578 INCHES MINIMUM AND 0.3047 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 |
|---|---|
| NAS1581F3T9X | Ufc Aerospace Corp. (USA) |
| Reference | Meaning |
|---|---|
| NAS1581F3T9X | 3/2 Design control — primary reference U.S. Government activity |
| NAS1581A3T9X | 5/9 Secondary reference Ufc Aerospace Corp. |
NSN 5305-01-398-1302 is a Screw,shoulder, manufactured by Ufc Aerospace Corp., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-398-1302 has 1 manufacturer part number on file: NAS1581F3T9X (Ufc Aerospace Corp.).
Key specifications for NAS1581F3T9X: Fastener Length: 0.910 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN; Shoulder Length: 0.509 INCHES MINIMUM AND 0.529 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.2041 INCHES MINIMUM AND 0.2051 INCHES MAXIMUM FIRST SHOULDER IN. 19 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.