The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-088-0299, 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 17 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-088-0299 |
| Primary Part Number | 78351-1216 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Washer Outside Diameter | 1.250 INCHES MAXIMUM IN |
| Width Across Flats | 0.927 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS 2401 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Washer Thickness | 0.152 INCHES MINIMUM AND 0.172 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 6304 ASSN STD 1ST MATERIAL RESPONSE OR AMS 6487 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.750 INCHES IN |
| Specification/standard Data | 76301-ST3-737 MANUFACTURERS STANDARD |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 601 OR STEEL COMP H11 OVERALL |
| 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 |
|---|---|
| H50675-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| H50675-12 | Howmet Global Fastening Systems Inc (USA) |
| 78351-1216 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| H50675-12 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| LH12343-12 | C/1 Advisory reference — outside the item-of-supply concept Esna, Llc |
| 78351-1216 | 5/9 Secondary reference U.S. Government activity |
| LH12343-12 | 5/9 Secondary reference Harvard Industries Inc |
| ST3M737-12 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5310-01-088-0299 is a Nut,self-Locking,extended Washer, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-088-0299 has 3 manufacturer part numbers on file: H50675-12 (Sps Technologies, Llc Dba PB Fasteners), H50675-12 (Howmet Global Fastening Systems Inc), 78351-1216 (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 78351-1216: Lubrication: DRY FILM LUBRICANT; Overall Height: 0.796 INCHES MAXIMUM IN; Washer Outside Diameter: 1.250 INCHES MAXIMUM IN; Width Across Flats: 0.927 INCHES MINIMUM AND 0.943 INCHES MAXIMUM IN. 17 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.