The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-277-0409, 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 18 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-277-0409 |
| Primary Part Number | B1821BH100F375N |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES THREADS |
| Head Height | 0.591 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN |
| Fastener Length | 3.562 INCHES MINIMUM AND 3.750 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | ASTM B633 TY 2 SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 2.043 INCHES MINIMUM AND 2.250 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | SAE J429 GRADE 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.469 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 2 TYPE AND 10P STYLE AND 8 GRADE |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| AEB02FA00C75WA6AA1 | American Society of Mechanical Engineers Inc (USA) |
| B1821BH100F375N PRIMARY | The American Society of Mechanical Engineers (USA) |
| Reference | Meaning |
|---|---|
| MS90727-237 | 5/9 Secondary reference U.S. Government activity |
| B1821BH100F375N | 5/9 Secondary reference U.S. Government activity |
| FF-S-85 | 4/1 Identification reference U.S. Government activity |
NSN 5305-01-277-0409 is a Screw,cap,hexagon Head, manufactured by The American Society of Mechanical Engineers, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-277-0409 has 2 manufacturer part numbers on file: AEB02FA00C75WA6AA1 (American Society of Mechanical Engineers Inc), B1821BH100F375N (The American Society of Mechanical Engineers).
Key specifications for B1821BH100F375N: Surface Finish: 63.0 MICROINCHES THREADS; Head Height: 0.591 INCHES MINIMUM AND 0.627 INCHES MAXIMUM IN; Fastener Length: 3.562 INCHES MINIMUM AND 3.750 INCHES MAXIMUM IN; Surface Treatment Document and Classification: ASTM B633 TY 2 SC 3 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 18 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.