The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-01-641-7679, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-641-7679 |
| Primary Part Number | 2.5-4.5UNC-2AX5.00NICUALD4 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Head Height | 1.423 INCHES NOMINAL IN |
| Fastener Length | 3.50 INCHES NOMINAL IN |
| Thread Length | 6.423 INCHES NOMINAL IN |
| Criticality Code Justification | ZZZX |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Departure From Cited Designator | MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P-9290 SYSTEM CERTIFICATION PRODURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICLES AS DIFFERENTIATED BY SPECIAL TEST FEATURES |
| Width Between Flats | 3.380 INCHES NOMINAL IN |
| Nonstandard Thread Pitch Diameter | +2.250 TO 2.255 INCHES IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 4.50 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 2.5-4.5UNC-2AX5.00NICUALD4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 501-7627541 ITEM 005D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2.5-4.5UNC-2AX5.00NICUAL | 4/1 Identification reference U.S. Government activity |
| 501-7627541 ITEM 005 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5305-01-641-7679 is a Screw,cap,hexagon Head, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-641-7679 has 2 manufacturer part numbers on file: 2.5-4.5UNC-2AX5.00NICUALD4 (Naval Inventory Control Point Mechanicsburg), 501-7627541 ITEM 005D4 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 2.5-4.5UNC-2AX5.00NICUALD4: Head Height: 1.423 INCHES NOMINAL IN; Fastener Length: 3.50 INCHES NOMINAL IN; Thread Length: 6.423 INCHES NOMINAL IN; Criticality Code Justification: ZZZX. 12 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.