The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-346-2261, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 20 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-346-2261 |
| Primary Part Number | 6603688-VHBA-94 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Width Across Flats | 0.750 INCHES NOMINAL IN |
| Head Height | 0.988 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Fastener Length | 5.500 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-C-83488 TY 2 CL 3 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-87115 CL 3 MIL SPEC 2ND TREATMENT RESPONSE FASTENER |
| Thread Length | 5.250 INCHES NOMINAL IN |
| Hardness Rating | 37.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM FASTENER |
| Material Document and Classification | ASTM A574 ASSN STD SINGLE MATERIAL RESPONSE FASTENER |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Locking Feature | PELLET OR STRIP OR PATCH THREADS |
| Surface Treatment | ALUMINUM AND CHROMATE OR ZINC AND CHROMATE FASTENER |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 8 |
| Material | STEEL UNS K03104 FASTENER |
| Material | PLASTIC POLYAMIDE NYLON LOCKING FEATURE |
| Thread Series Designator | UNRC |
| Head Diameter | 1.479 INCHES MINIMUM AND 1.500 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 |
|---|---|
| 6603688-VHBA-94 PRIMARY | Naval Sea Systems Command (USA) |
| 803-5959303-X-83 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 5959303-83 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-346-2261 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-346-2261 has 2 manufacturer part numbers on file: 6603688-VHBA-94 (Naval Sea Systems Command), 803-5959303-X-83 (Naval Sea Systems Command).
Key specifications for 6603688-VHBA-94: Width Across Flats: 0.750 INCHES NOMINAL IN; Head Height: 0.988 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Fastener Length: 5.500 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-C-83488 TY 2 CL 3 MIL SPEC 1ST TREATMENT RESPONSE OR MIL-C-87115 CL 3 MIL SPEC 2ND TREATMENT RESPONSE FASTENER. 20 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.