The Nut,self-Locking,barrel, cataloged under National Stock Number 5310-01-295-1073, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bristol Industries, Llc. Government technical data includes 16 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-295-1073 |
| Primary Part Number | BFN441-7 |
| Item Name | Nut,self-Locking,barrel |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bristol Industries, Llc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Nut Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Material Document and Classification | AMS 5662 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5663 ASSN STD 1ST MATERIAL RESPONSE OR MIL-T-9047 COMP 6-6A1-4V MIL SPEC 2ND MATERIAL RESPONSE OVERALL V |
| Features Provided | FLOATING NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.438 INCHES IN |
| Nut Diameter | 0.838 INCHES MINIMUM AND 0.840 INCHES MAXIMUM IN |
| Specification/standard Data | 76301-ST3-441 MANUFACTURERS STANDARD |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.714 INCHES MAXIMUM IN |
| Nut Style | FLOATING SELF-LOCKING BARREL |
| Thread Class | 3B |
| Thread Quantity Per Inch | 20 |
| Material | NICKEL ALLOY 718 OR TITANIUM ALLOY OVERALL |
| Barrel Height | 0.460 INCHES MINIMUM AND 0.470 INCHES MAXIMUM IN |
| 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 |
|---|---|
| ST3M441-7M | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 77020-7 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BFN441-7 PRIMARY | Bristol Industries, Llc (USA) |
| K50188-7 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M441-7M | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| B10695-7 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-295-1073 is a Nut,self-Locking,barrel, manufactured by Bristol Industries, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-295-1073 has 4 manufacturer part numbers on file: ST3M441-7M (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), 77020-7 (Sps Technologies, Llc Dba PB Fasteners), BFN441-7 (Bristol Industries, Llc), K50188-7 (Howmet Global Fastening Systems Inc).
Key specifications for BFN441-7: Lubrication: DRY FILM LUBRICANT; Nut Length: 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Material Document and Classification: AMS 5662 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5663 ASSN STD 1ST MATERIAL RESPONSE OR MIL-T-9047 COMP 6-6A1-4V MIL SPEC 2ND MATERIAL RESPONSE OVERALL V. 16 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.