The Screw,cap,socket Head, cataloged under National Stock Number 5305-00-639-8085, is classified within Federal Supply Class 5305 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Bae Systems Land & Armaments L.p.. Government technical data includes 18 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5305-00-639-8085 |
| Primary Part Number | S643 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — No Item Name Available |
| Manufacturer | Bae Systems Land & Armaments L.p. |
| Status | CANCELLED |
| Head Diameter | 0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Minimum Yield Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Thread Direction | RIGHT-HAND |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Thread Quantity Per Inch | 20 |
| Nondefinitive Spec/std Data | 1 TYPE AND 11 STYLE |
| Material Document and Classification | QQ-S-624 FED SPEC ALL MATERIAL RESPONSES OVERALL |
| Head Style | FLAT CHAMFER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Internal Drive Style | HEXAGON |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Material | STEEL COMP 2340 OR STEEL COMP 3135 OR STEEL COMP 4037 OR STEEL COMP 4137 OR STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8630 OR STEEL COMP 8740 OVERALL |
| Head Height | 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Fastener Length | 2.750 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Width Across Flats | 0.187 INCHES MINIMUM AND 0.189 INCHES MAXIMUM IN |
| Thread Length | 1.375 INCHES NOMINAL IN |
| Acquisition Status | CANCELLED |
| HAZMAT | No |
NSN 5305-00-639-8085 is a Screw,cap,socket Head, manufactured by Bae Systems Land & Armaments L.p., classified under FSC 5305 (No Item Name Available). Status: cancelled.
NSN 5305-00-639-8085 has 2 cross-referenced part numbers: S643 (Bae Systems Land & Armaments L.p.), 587452 (Army Weapons Command Attn Amswe-Ree-S).
There are 9 known substitutes for 5305-00-639-8085: 4310-00-060-4586, 5940-00-115-2676, 3940-00-235-8453 and 6 more. Verify interchangeability with system specifications before substitution.
Key specifications for S643: Head Diameter: 0.367 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Minimum Yield Strength: 140000 POUNDS PER SQUARE INCH LBS; Thread Direction: RIGHT-HAND; Thread Series Designator: UNIFIED NATIONAL COARSE (UNC). 18 total characteristics are documented in the Federal Logistics Information System.
NSN 5305-00-639-8085 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.