The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-417-6449, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Imi Services Usa Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-417-6449 |
| Primary Part Number | B1831AH240040L |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Imi Services Usa Inc |
| Status | ACTIVE |
| Width Across Flats | 19.0 MILLIMETERS NOMINAL MM |
| Head Height | 23.70 MILLIMETERS MINIMUM AND 24.00 MILLIMETERS MAXIMUM MM |
| External Thread Tolerance Class | 6G G |
| Fastener Length | 34.0 MILLIMETERS MINIMUM AND 40.0 MILLIMETERS MAXIMUM MM |
| Surface Treatment Document and Classification | QQ-P-416 TY2, CL3 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| Thread Pitch in Millimeters | 3.0 |
| Material Document and Classification | ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 24.0 MILLIMETERS MM |
| Head Style | FLAT CHAMFER |
| Locking Feature | PELLET OR STRIP OR PATCH THREADS |
| Surface Treatment | CADMIUM AND CHROMATE FASTENER |
| Internal Drive Style | HEXAGON |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Material | STEEL PROPERTY CLASS 12.9 FASTENER |
| Thread Series Designator | M |
| Head Diameter | 35.4 MILLIMETERS MINIMUM AND 36.0 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| B1831AH240040L PRIMARY | Imi Services Usa Inc (USA) |
| Reference | Meaning |
|---|---|
| B1831AH240040L | 3/1 Design control — primary reference U.S. Government activity |
NSN 5305-01-417-6449 is a Screw,cap,socket Head, manufactured by Imi Services Usa Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-417-6449 has 1 manufacturer part number on file: B1831AH240040L (Imi Services Usa Inc).
Key specifications for B1831AH240040L: Width Across Flats: 19.0 MILLIMETERS NOMINAL MM; Head Height: 23.70 MILLIMETERS MINIMUM AND 24.00 MILLIMETERS MAXIMUM MM; External Thread Tolerance Class: 6G G; Fastener Length: 34.0 MILLIMETERS MINIMUM AND 40.0 MILLIMETERS MAXIMUM MM. 16 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.