The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-033-2674, 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 21 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-033-2674 |
| Primary Part Number | MK4001-4P |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Plate Thickness | 0.055 INCHES MAXIMUM IN |
| Nut Length | 0.591 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Plate Width | 0.380 INCHES MINIMUM AND 0.414 INCHES MAXIMUM IN |
| Temp Rating | 450.0 FAHRENHEIT NOMINAL DEGF |
| Hardness Rating | 49.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Mounting Provision Location | OPPOSITE NUT PROJECTION SIDE |
| Nut Counterbore Depth | 0.062 INCHES MINIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Counterbore Diameter | 0.254 INCHES MINIMUM NUT IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.281 INCHES MAXIMUM IN |
| Welding Projection Quantity | 2 |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Nut Mounting Provision | WELDING PROJECTIONS |
| 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 |
|---|---|
| MK4001-4P | Howmet Global Fastening Systems Inc (USA) |
| RMLHTA575M2860P-048 | Esna, Llc (USA) |
| R300C4MW | Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| MK4001-4P | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| MA 12740E-048PW | 5/2 Secondary reference U.S. Government activity |
| 457-5607 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| MS21087L4W | 5/9 Secondary reference U.S. Government activity |
| MA 12740E-048PW | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| MS21087L4W | 3/2 Design control — primary reference U.S. Government activity |
| MT13C428PWBM | 5/9 Secondary reference Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace |
| RMLHTA575M2860P-048 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-033-2674 is a Nut,self-Locking,plate, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-033-2674 has 3 manufacturer part numbers on file: MK4001-4P (Howmet Global Fastening Systems Inc), RMLHTA575M2860P-048 (Esna, Llc), R300C4MW (Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems).
Key specifications for MK4001-4P: Lubrication: DRY FILM LUBRICANT; Plate Thickness: 0.055 INCHES MAXIMUM IN; Nut Length: 0.591 INCHES MAXIMUM IN; Thread Series: UNF. 21 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.