The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-181-2399, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Circor Pumps North America Llc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-181-2399 |
| Primary Part Number | S3213A |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Circor Pumps North America Llc |
| Status | ACTIVE |
| Width Across Flats | 1.875 INCHES NOMINAL IN |
| Thread Series | UN |
| Nut Counterbore Depth | 0.089 INCHES MINIMUM AND 0.099 INCHES MAXIMUM FIRST END IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.375 INCHES IN |
| Counterbore Diameter | 1.645 INCHES MINIMUM AND 1.655 INCHES MAXIMUM FIRST END IN |
| Nut Height | 0.469 INCHES NOMINAL IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Bearing Surface Type | CHAMFERED |
| 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 |
|---|---|
| S3213A PRIMARY | Circor Pumps North America Llc (USA) |
| HC-402J/0219 | Siemens Energy, Inc. (USA) |
| Reference | Meaning |
|---|---|
| S3213A | 5/9 Secondary reference Siemens Energy, Inc. |
| DD692-S4601-39 PIECE 52 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-181-2399 is a Nut,plain,hexagon, manufactured by Circor Pumps North America Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-181-2399 has 2 manufacturer part numbers on file: S3213A (Circor Pumps North America Llc), HC-402J/0219 (Siemens Energy, Inc.).
Key specifications for S3213A: Width Across Flats: 1.875 INCHES NOMINAL IN; Thread Series: UN; Nut Counterbore Depth: 0.089 INCHES MINIMUM AND 0.099 INCHES MAXIMUM FIRST END IN; Thread Direction: RIGHT-HAND. 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.