The Screw,shoulder, cataloged under National Stock Number 5305-01-700-4170, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 21 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-700-4170 |
| Primary Part Number | AES20U625C50BB3A91 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Width Across Flats | 0.3125 INCHES NOMINAL IN |
| Head Height | 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Fastener Length | 3.500 INCHES NOMINAL IN |
| Shoulder Length | 2.745 INCHES MINIMUM AND 2.755 INCHES MAXIMUM OVERALL IN |
| Surface Treatment Document and Classification | ASTM B633, TYPE II, SC 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.6210 INCHES MINIMUM AND 0.6230 INCHES MAXIMUM OVERALL IN |
| Thread Length | 0.750 INCHES NOMINAL IN |
| Shoulder Shape | ROUND OVERALL |
| Material Document and Classification | ASTM A574, ALLOY STEEL AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 05047-ASME B18.24-2020 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Surface Treatment | ZINC OVERALL |
| Chamfer Angle | 45.0 DEGREES MINIMUM AND 50.0 DEGREES MAXIMUM |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.853 INCHES MINIMUM AND 0.875 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 |
|---|---|
| AES20U625C50BB3A91 PRIMARY | The American Society of Mechanical Engineers (USA) |
NSN 5305-01-700-4170 is a Screw,shoulder, manufactured by The American Society of Mechanical Engineers, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-700-4170 has 1 manufacturer part number on file: AES20U625C50BB3A91 (The American Society of Mechanical Engineers).
Key specifications for AES20U625C50BB3A91: Width Across Flats: 0.3125 INCHES NOMINAL IN; Head Height: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Fastener Length: 3.500 INCHES NOMINAL IN; Shoulder Length: 2.745 INCHES MINIMUM AND 2.755 INCHES MAXIMUM OVERALL IN. 21 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.