The Setscrew, cataloged under National Stock Number 5305-01-666-9900, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-666-9900 |
| Primary Part Number | FFS200BYT1STY6 1/4-20CL3A X 1/2 |
| Item Name | Setscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Point Style | DOG |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL FASTENER |
| Material | PLASTIC NYLON LOCKING FEATURE |
| 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 |
|---|---|
| FFS200BYT1STY6 1/4-20CL3A X 1/2 PRIMARY | Sae International Dba Sae International (USA) |
| SF11219 ITEM 43 | Circor Pumps North America Llc (USA) |
| Reference | Meaning |
|---|---|
| M18240 1/4-20 CL3A X 1/2 | 5/2 Secondary reference U.S. Government activity |
| FFS200BYT1STY6 1/4-20CL3A X 1/2 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5305-01-666-9900 is a Setscrew, manufactured by Sae International Dba Sae International, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-666-9900 has 2 manufacturer part numbers on file: FFS200BYT1STY6 1/4-20CL3A X 1/2 (Sae International Dba Sae International), SF11219 ITEM 43 (Circor Pumps North America Llc).
Key specifications for FFS200BYT1STY6 1/4-20CL3A X 1/2: Fastener Length: 0.500 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN; Thread Direction: RIGHT-HAND; Point Style: DOG. 8 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.