The Nut,plain,castellated,hexagon, cataloged under National Stock Number 5310-01-175-2813, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-175-2813 |
| Primary Part Number | 73781-918 |
| Item Name | Nut,plain,castellated,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Width Across Flats | 0.680 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.5625 INCHES IN |
| Nut Height | 0.547 INCHES MINIMUM AND 0.579 INCHES MAXIMUM IN |
| Nut Style | CASTELLATED, HEXAGON |
| Thread Class | 3B |
| Material | STEEL CORROSION RESISTING OVERALL |
| Bearing Surface Type | FLAT |
| 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 |
|---|---|
| H49404-9 | Howmet Global Fastening Systems Inc (USA) |
| 73781-918 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 9131M75P27 | General Electric Company (USA) |
| Reference | Meaning |
|---|---|
| 73781-918 | 5/9 Secondary reference U.S. Government activity |
| SME9925-9GE | 5/9 Secondary reference Harvard Industries Inc |
| 9131M75P07 | C/1 Advisory reference — outside the item-of-supply concept General Electric Company |
NSN 5310-01-175-2813 is a Nut,plain,castellated,hexagon, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-175-2813 has 3 manufacturer part numbers on file: H49404-9 (Howmet Global Fastening Systems Inc), 73781-918 (Sps Technologies, Llc Dba PB Fasteners), 9131M75P27 (General Electric Company).
Key specifications for 73781-918: Width Across Flats: 0.680 INCHES MINIMUM AND 0.692 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Material Document and Classification: AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 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.