The Screw,assembled Washer, cataloged under National Stock Number 5305-01-430-4741, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lufasco Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-430-4741 |
| Primary Part Number | 1676AS298-4 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lufasco Inc |
| Status | ACTIVE |
| Head Height | 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Primary Washer Outside Diameter | 0.494 INCHES NOMINAL IN |
| Material Document and Classification | AISI C1010 THRU C1020 ASSN STD SINGLE MATERIAL RESPONSE PRIMARY WASHER |
| Material Document and Classification | AISIC1115 THRU C1132 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | PAN NO. 2 |
| Primary Washer Style | FLAT EXTERNAL TEETH |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.023 INCHES MINIMUM AND 0.028 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Material | STEEL PRIMARY WASHER |
| Material | STEEL FASTENER |
| Thread Series Designator | UNF |
| Washer Quantity | 1 |
| Head Diameter | 0.473 INCHES MINIMUM AND 0.492 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 |
|---|---|
| 1676AS298-4 PRIMARY | Lufasco Inc (USA) |
| 1676AS298-4 | Illinois Tool Works Inc (USA) |
| Reference | Meaning |
|---|---|
| 1676AS298-4 | 7/2 Vendor item drawing reference Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| MPS04F008SEM | 5/9 Secondary reference Lufasco Inc |
| 1676AS298-4 | 5/9 Secondary reference Itw Shakeproof Automotive Products |
NSN 5305-01-430-4741 is a Screw,assembled Washer, manufactured by Lufasco Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-430-4741 has 2 manufacturer part numbers on file: 1676AS298-4 (Lufasco Inc), 1676AS298-4 (Illinois Tool Works Inc).
Key specifications for 1676AS298-4: Head Height: 0.130 INCHES MINIMUM AND 0.144 INCHES MAXIMUM IN; Fastener Length: 0.500 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-416,TY2,CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Primary Washer Outside Diameter: 0.494 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.