The Nut,plain,castellated,hexagon, cataloged under National Stock Number 5310-01-398-8770, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Champ Industries Div Champ Industries, Inc. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-398-8770 |
| Primary Part Number | ES1633 |
| Item Name | Nut,plain,castellated,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Champ Industries Div Champ Industries, Inc |
| Status | ACTIVE |
| Width Across Flats | 1.870 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.250 INCHES IN |
| Nut Height | 0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Thread Class | 3B |
| Thread Quantity Per Inch | 12 |
| Material | STEEL OVERALL |
| Bearing Surface Type | WASHER FACED |
| 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 |
|---|---|
| ES1633 PRIMARY | Champ Industries Div Champ Industries, Inc (USA) |
| Reference | Meaning |
|---|---|
| ES1633 | 5/9 Secondary reference Mechanical Equipment Sale Inc |
NSN 5310-01-398-8770 is a Nut,plain,castellated,hexagon, manufactured by Champ Industries Div Champ Industries, Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-398-8770 has 1 manufacturer part number on file: ES1633 (Champ Industries Div Champ Industries, Inc).
Key specifications for ES1633: Width Across Flats: 1.870 INCHES MINIMUM AND 1.890 INCHES MAXIMUM IN; Thread Series: UNF; Thread Direction: RIGHT-HAND; Nominal Thread Size: 1.250 INCHES IN. 10 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.