The Screw,assembled Washer, cataloged under National Stock Number 5305-01-439-6682, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-439-6682 |
| Primary Part Number | NAS8403U8 |
| Item Name | Screw,assembled Washer |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp |
| Status | ACTIVE |
| Nonmachine Nominal Thread Diameter | 0.190 INCHES IN |
| Extended Washer Thickness | 0.495 INCHES NOMINAL IN |
| Head Height | 0.094 INCHES NOMINAL IN |
| Fastener Length | 0.495 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.428 INCHES NOMINAL IN |
| Primary Washer Outside Diameter | 0.428 INCHES NOMINAL IN |
| Thread Length | 0.495 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.095 INCHES IN |
| Head Style | ROUND EXTENDED WASHER |
| Primary Washer Style | FLAT |
| Thread Direction | RIGHT-HAND |
| Primary Washer Material Thickness | 0.034 INCHES NOMINAL IN |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Washer Quantity | 1 |
| Head Diameter | 0.357 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| NAS8403U8 | Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp (USA) |
| NAS8403U8 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| NAS8403U8 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| NAS8403U8 | Fortune Industries Inc (USA) |
| NAS8403U8 | B & B Specialties Inc (USA) |
| NAS8403U8 | Cbs Fasteners, Llc (USA) |
| NAS8403U8 | 3-V Fastener Co., Inc. (USA) |
| NAS8403U8 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| NAS8403U8 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-439-6682 is a Screw,assembled Washer, manufactured by Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-439-6682 has 8 manufacturer part numbers on file: NAS8403U8 (Sikorsky Aircraft Corporation Dba Sikorsky Aircraft Corp), NAS8403U8 (Fastener Innovation Technology, Inc. Dba F I T), NAS8403U8 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), NAS8403U8 (Fortune Industries Inc), NAS8403U8 (B & B Specialties Inc) and 3 more.
Key specifications for NAS8403U8: Nonmachine Nominal Thread Diameter: 0.190 INCHES IN; Extended Washer Thickness: 0.495 INCHES NOMINAL IN; Head Height: 0.094 INCHES NOMINAL IN; Fastener Length: 0.495 INCHES NOMINAL IN. 19 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.