The Ring,externally Threaded, cataloged under National Stock Number 5365-01-421-2951, is classified within Federal Supply Class 5365 (Bushings, Rings, Shims, and Spacers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5365-01-421-2951 |
| Primary Part Number | 803-6397434-X61XXX ITEM 21 |
| Item Name | Ring,externally Threaded |
| FSC / FSG | 5365 / 53 — Bushings, Rings, Shims, and Spacers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Bore Annular Internal Serration | NOT INCLUDED |
| Beveled Thread | NOT INCLUDED |
| Drive Type | SLOTTED FACE |
| Bore Shape | STRAIGHT |
| Thread Direction | RIGHT-HAND |
| Setscrew Locking Notch | NOT INCLUDED |
| Accommodation Type and Quantity | 2 SLOTS |
| Casehardening Indicator | NOT CASEHARDENED |
| Angle Between Accommodations in Deg | 180.0 |
| Thread Size | 1.500-16 |
| Screw Thread Series Designator | UN |
| Depth | 0.187 INCHES MINIMUM AND 0.219 INCHES MAXIMUM IN |
| Width | 0.234 INCHES MINIMUM AND 0.266 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Bore Diameter | 1.232 INCHES MINIMUM AND 1.240 INCHES MAXIMUM IN |
| Material | COBALT ALLOY |
| 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 |
|---|---|
| 803-6397434-X61XXX ITEM 21 PRIMARY | Naval Sea Systems Command (USA) |
NSN 5365-01-421-2951 is a Ring,externally Threaded, manufactured by Naval Sea Systems Command, classified under FSC 5365, Bushings, Rings, Shims, and Spacers. Status: active.
NSN 5365-01-421-2951 has 1 manufacturer part number on file: 803-6397434-X61XXX ITEM 21 (Naval Sea Systems Command).
Key specifications for 803-6397434-X61XXX ITEM 21: Bore Annular Internal Serration: NOT INCLUDED; Beveled Thread: NOT INCLUDED; Drive Type: SLOTTED FACE; Overall Length: 0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN. 16 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.