The Screw,machine, cataloged under National Stock Number 5305-01-371-5848, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 15 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 | 5305-01-371-5848 |
| Primary Part Number | ST172C3-18 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Head Height | 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Screw Surface Treatment | PASSIVATE |
| Fastener Length | 1.109 INCHES MINIMUM AND 1.156 INCHES MAXIMUM IN |
| Screw Material Document and Classification | AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE |
| Thread Length | 1.047 INCHES MINIMUM AND 1.156 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.302 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Screw Material | IRON ALLOY 660 |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Screw Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE |
| 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 |
|---|---|
| ST172C3-18 PRIMARY | The Boeing Company (USA) |
NSN 5305-01-371-5848 is a Screw,machine, manufactured by The Boeing Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-371-5848 has 1 manufacturer part number on file: ST172C3-18 (The Boeing Company).
Key specifications for ST172C3-18: Head Height: 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Screw Surface Treatment: PASSIVATE; Fastener Length: 1.109 INCHES MINIMUM AND 1.156 INCHES MAXIMUM IN; Screw Material Document and Classification: AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE. 15 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.