The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-598-8976, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howard J. Moore Co, Inc. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-598-8976 |
| Primary Part Number | NGS551AH6-6 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howard J. Moore Co, Inc |
| Status | ACTIVE |
| Spline Minor Diameter | 0.157 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN |
| Fastener Length | 0.938 INCHES MINIMUM AND 0.968 INCHES MAXIMUM IN |
| Thread Length | 0.578 INCHES NOMINAL IN |
| Material Document and Classification | ASTM D6778 GROUP 01, CLASS 3, GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Spline Major Diameter | 0.219 INCHES MINIMUM AND 0.222 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Color | NATURAL OVERALL |
| Internal Drive Style | TORX |
| Thread Quantity Per Inch | 24 |
| Material | PLASTIC ACETAL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.524 INCHES MINIMUM AND 0.531 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 |
|---|---|
| NGS551AH6-6 | Northrop Grumman Systems Corporation (USA) |
| NGS551AH6-6 PRIMARY | Howard J. Moore Co, Inc (USA) |
NSN 5305-01-598-8976 is a Screw,cap,socket Head, manufactured by Howard J. Moore Co, Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-598-8976 has 2 manufacturer part numbers on file: NGS551AH6-6 (Northrop Grumman Systems Corporation), NGS551AH6-6 (Howard J. Moore Co, Inc).
Key specifications for NGS551AH6-6: Spline Minor Diameter: 0.157 INCHES MINIMUM AND 0.160 INCHES MAXIMUM IN; Fastener Length: 0.938 INCHES MINIMUM AND 0.968 INCHES MAXIMUM IN; Thread Length: 0.578 INCHES NOMINAL IN; Material Document and Classification: ASTM D6778 GROUP 01, CLASS 3, GRADE 2 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 14 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.