The Nut,self-Locking,extended Washer, cataloged under National Stock Number 5310-01-262-6314, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-262-6314 |
| Primary Part Number | H33-6 |
| Item Name | Nut,self-Locking,extended Washer |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Washer Outside Diameter | 0.598 INCHES MAXIMUM IN |
| Width Across Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Material Document and Classification | AMS5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.375 INCHES IN |
| Nut Style | DOUBLE HEXAGON |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | IRON ALLOY 660 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 |
|---|---|
| H33-6 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BH00190-6 PRIMARY | Bristol Industries, Llc (USA) |
| FN1216-624 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| R398 | General Electric Company (USA) |
| Reference | Meaning |
|---|---|
| R398P4H | D/9 Drawing number reference only General Electric Company |
| R398P4 | C/1 Advisory reference — outside the item-of-supply concept General Electric Company |
| VN405B064 | 3/2 Design control — primary reference U.S. Government activity |
| R398P4D | D/9 Drawing number reference only General Electric Company |
| R398P4B | D/9 Drawing number reference only General Electric Company |
| R398P4F | D/9 Drawing number reference only General Electric Company |
| LH3417-064 | 5/9 Secondary reference Harvard Industries Inc |
| R398P4E | D/9 Drawing number reference only General Electric Company |
| R398P4C | D/9 Drawing number reference only General Electric Company |
NSN 5310-01-262-6314 is a Nut,self-Locking,extended Washer, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-262-6314 has 4 manufacturer part numbers on file: H33-6 (Howmet Global Fastening Systems Inc), BH00190-6 (Bristol Industries, Llc), FN1216-624 (Sps Technologies, Llc Dba PB Fasteners), R398 (General Electric Company).
3 possible matches (shared part number, not a government interchangeability claim): 5310-01-264-5908, 5310-01-313-6009, 5340-01-376-8360. Verify interchangeability with system specifications before substitution.
Key specifications for H33-6: Overall Height: 0.458 INCHES MAXIMUM IN; Washer Outside Diameter: 0.598 INCHES MAXIMUM IN; Width Across Flats: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN; Thread Series: UNF. 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.