The Nut,self-Locking,castellated,hex, cataloged under National Stock Number 5310-01-027-9392, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Prestolite Electric Inc. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-027-9392 |
| Primary Part Number | 90-2188 |
| Item Name | Nut,self-Locking,castellated,hex |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Prestolite Electric Inc |
| Status | ACTIVE |
| Width Across Flats | 0.940 INCHES NOMINAL IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.625 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.445 INCHES NOMINAL IN |
| Nut Style | CASTELLATED, HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 18 |
| 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 |
|---|---|
| 42-90-2188 | Wheeler Fleet Solutions, Co. (USA) |
| 90-2188 PRIMARY | Prestolite Electric Inc (USA) |
| Reference | Meaning |
|---|---|
| 90-2188 | 5/9 Secondary reference Prestolite Electric Inc |
NSN 5310-01-027-9392 is a Nut,self-Locking,castellated,hex, manufactured by Prestolite Electric Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-027-9392 has 2 manufacturer part numbers on file: 42-90-2188 (Wheeler Fleet Solutions, Co.), 90-2188 (Prestolite Electric Inc).
Key specifications for 90-2188: Width Across Flats: 0.940 INCHES NOMINAL IN; Thread Series: UNF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.625 INCHES IN. 11 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.