The Screw,assembled Washer, cataloged under National Stock Number 5305-01-522-9506, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-522-9506 |
| Primary Part Number | 1900474-21 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN |
| Fastener Length | 0.625 INCHES NOMINAL IN |
| Secondary Washer Relationship to Primary Washer | NOT IDENTICAL |
| Primary Washer Outside Diameter | 0.250 INCHES NOMINAL IN |
| Secondary Washer Style | FLAT |
| Nominal Thread Diameter | 0.138 INCHES IN |
| Head Style | PAN |
| Primary Washer Style | SPLIT HELICAL RING |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.031 INCHES NOMINAL IN |
| Secondary Washer Outside Diameter | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Color | BLACK OVERALL |
| Surface Treatment | OXIDE OVERALL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Secondary Washer Material Thickness | 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Thread Quantity Per Inch | 32 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Washer Quantity | 2 |
| Head Diameter | 0.256 INCHES MINIMUM AND 0.294 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 |
|---|---|
| 1900474-21 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| 114054PP.625SSGF11 | Accurate Screw Machine Corp Div Accurate Screw Machine Corporation (USA) |
| 1983698-1 ITEM # 14 | Northrop Grumman Systems Corporation (USA) |
NSN 5305-01-522-9506 is a Screw,assembled Washer, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-522-9506 has 3 manufacturer part numbers on file: 1900474-21 (Northrop Grumman Systems Corporation), 114054PP.625SSGF11 (Accurate Screw Machine Corp Div Accurate Screw Machine Corporation), 1983698-1 ITEM # 14 (Northrop Grumman Systems Corporation).
Key specifications for 1900474-21: Head Height: 0.087 INCHES MINIMUM AND 0.097 INCHES MAXIMUM IN; Fastener Length: 0.625 INCHES NOMINAL IN; Secondary Washer Relationship to Primary Washer: NOT IDENTICAL; Primary Washer Outside Diameter: 0.250 INCHES NOMINAL 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.