The Screw,shoulder, cataloged under National Stock Number 5305-01-399-0187, 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 17 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-399-0187 |
| Primary Part Number | 751-6402301-39 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 0.875 INCHES NOMINAL IN |
| Shoulder Length | 0.178 INCHES MINIMUM AND 0.188 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | QQ-N-281, CL B FORM 1, COND CD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.362 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Locking Feature | PATCH OR PELLET OR STRIP THREADS |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | NICKEL ALLOY R-405 OVERALL |
| 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 | X |
| Part Number | Manufacturer |
|---|---|
| 751-6402302-39 | Naval Sea Systems Command (USA) |
| 211033409 | Naval Sea Systems Command (USA) |
| 751-6402386-1 | Naval Sea Systems Command (USA) |
| 751-6402301 ITEM 39 | Naval Sea Systems Command (USA) |
| 751-6402301-39 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5305-01-399-0187 is a Screw,shoulder, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-399-0187 has 5 manufacturer part numbers on file: 751-6402302-39 (Naval Sea Systems Command), 211033409 (Naval Sea Systems Command), 751-6402386-1 (Naval Sea Systems Command), 751-6402301 ITEM 39 (Naval Sea Systems Command), 751-6402301-39 (Naval Sea Systems Command).
Key specifications for 751-6402301-39: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 0.875 INCHES NOMINAL IN; Shoulder Length: 0.178 INCHES MINIMUM AND 0.188 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.245 INCHES MINIMUM AND 0.250 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.