The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-321-8734, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Naval Sea Systems Command. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-321-8734 |
| Primary Part Number | 6298012-1 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Material | STEEL OVERALL |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Surface Treatment Document and Classification | DOD-P-16232 TY M,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Surface Treatment | PHOSPHATE OVERALL |
| Thread Series Designator | UNRF |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 84.0 DEGREES MAXIMUM |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Fastener Length | 0.558 INCHES MINIMUM AND 0.578 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Length | 0.488 INCHES MINIMUM IN |
| Head Style | FLAT COUNTERSUNK |
| Head Diameter | 0.531 INCHES NOMINAL IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Width Across Flats | 0.156 INCHES MINIMUM AND 0.158 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Minimum Yield Strength | 130000 POUNDS PER SQUARE INCH LBS |
| Thread Quantity Per Inch | 28 |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 5305-01-321-8734 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305 (No Item Name Available). Status: active.
NSN 5305-01-321-8734 has 3 cross-referenced part numbers: 629815-35 (Naval Sea Systems Command), 6298012-1 (Naval Sea Systems Command), 61022 (H-K Connecticut Holding Company).
There are 3 known substitutes for 5305-01-321-8734: 5305-00-988-1724, 6525-01-413-0468, 5325-01-720-0759. Verify interchangeability with system specifications before substitution.
Key specifications for 6298012-1: Material Document and Classification: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL; Material: STEEL OVERALL; Hardness Rating: 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL; Surface Treatment Document and Classification: DOD-P-16232 TY M,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 total characteristics are documented in the Federal Logistics Information System.