The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-521-1020, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Naval Ship Systems Command. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-521-1020 |
| Primary Part Number | 803-1385637-03X-11 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — No Item Name Available |
| Manufacturer | Naval Ship Systems Command |
| Status | ACTIVE |
| Material | NICKEL ALLOY OVERALL |
| Bearing Surface Type | FLAT |
| Material Document and Classification | ASTM-B164-2003 ASSN STD 1ST MATERIAL RESPONSE OVERALL |
| Nominal Thread Size | 0.675 INCHES IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Class | 2B |
| Nut Height | 0.375 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Width Across Flats | 1.063 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Thread Quantity Per Inch | 11 |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| 999-78-3-9 | Pima Valve, Llc (USA) |
| 999-78-3-9 | Hunt Valve Company, Inc. (USA) |
| 1385637 | Naval Ship Systems Command (USA) |
| 803-1385637-03X-11 PRIMARY | Naval Ship Systems Command (USA) |
NSN 5310-01-521-1020 is a Nut,plain,hexagon, manufactured by Naval Ship Systems Command, classified under FSC 5310 (No Item Name Available). Status: active.
NSN 5310-01-521-1020 has 4 cross-referenced part numbers: 999-78-3-9 (Pima Valve, Llc), 999-78-3-9 (Hunt Valve Company, Inc.), 1385637 (Naval Ship Systems Command), 803-1385637-03X-11 (Naval Ship Systems Command).
There are 11 known substitutes for 5310-01-521-1020: 4820-00-058-3630, 4820-00-878-4325, 4820-01-072-1204 and 8 more. Verify interchangeability with system specifications before substitution.
Key specifications for 803-1385637-03X-11: End Item Identification: SWING CHECK VALVE; Material: NICKEL ALLOY OVERALL; Bearing Surface Type: FLAT; Material Document and Classification: ASTM-B164-2003 ASSN STD 1ST MATERIAL RESPONSE OVERALL. 12 total characteristics are documented in the Federal Logistics Information System.