The Screw,self-Drilling, cataloged under National Stock Number 5305-01-654-2804, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The American Society of Mechanical Engineers. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-654-2804 |
| Primary Part Number | AESS1B250A50SB7A31 |
| Item Name | Screw,self-Drilling |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Nonmachine Nominal Thread Diameter | 0.250 INCHES0.250 INCHES IN |
| Head Height | 0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN |
| Point Length | 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN |
| Fastener Length | 1.50 INCHES NOMINAL1.50 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | PROTECTIVE GRAY FINISH MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.520 INCHES NOMINAL0.520 INCHES NOMINAL IN |
| Nonmachine Thread Style | SELF DRILLINGSELF DRILLING |
| Nominal Thread Diameter | 0.250 INCHES0.250 INCHES IN |
| Head Style | HEXAGON EXTENDED WASHERHEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HANDRIGHT-HAND |
| Point Style | SELF-DRILLINGSELF-DRILLING |
| Width Between Flats | 0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN |
| Pilot Length | 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN |
| Color | GRAY/GREY OVERALL |
| Internal Drive Style | W/O INTERNAL DRIVEW/O INTERNAL DRIVE |
| Thread Quantity Per Inch | 1414 |
| Material | STEEL PROPERTY CLASS 18.8 OVERALL |
| 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 |
|---|---|
| AESS1B250A50SB7A31 PRIMARY | The American Society of Mechanical Engineers (USA) |
| 90821A559 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 19E2401085-3 | 7/2 Vendor item drawing reference Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army |
NSN 5305-01-654-2804 is a Screw,self-Drilling, manufactured by The American Society of Mechanical Engineers, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-654-2804 has 2 manufacturer part numbers on file: AESS1B250A50SB7A31 (The American Society of Mechanical Engineers), 90821A559 (Mcmaster-Carr Supply Co).
Key specifications for AESS1B250A50SB7A31: Nonmachine Nominal Thread Diameter: 0.250 INCHES0.250 INCHES IN; Head Height: 0.240 INCHES NOMINAL0.240 INCHES NOMINAL IN; Point Length: 0.3125 INCHES NOMINAL0.3125 INCHES NOMINAL IN; Fastener Length: 1.50 INCHES NOMINAL1.50 INCHES NOMINAL IN. 17 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.