The Nut,self-Locking,plate, cataloged under National Stock Number 5310-00-326-5256, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-326-5256 |
| Primary Part Number | ST4M133-3-40 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Plate Thickness | 0.040 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Nut Length | 1.460 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE SHELL |
| Thread Series | UNF |
| Plate Width | 1.570 INCHES MAXIMUM IN |
| Temp Rating | 350.0 FAHRENHEIT NOMINAL DEGF |
| Mounting Hole Arrangement Style | 3 HOLES |
| Distance From Base to Center of Aperture | 0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN |
| Material Document and Classification | AMS7245 ASSN STD SINGLE MATERIAL RESPONSE LOCKING INSERT |
| Material Document and Classification | QQ-A-367,T6 FED SPEC SINGLE MATERIAL RESPONSE SHELL |
| Mounting Hole Diameter | 0.123 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Center to Center Distance Between Mounting Holes Along Width | 0.990 INCHES MINIMUM AND 1.010 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.190 INCHES IN |
| Locking Feature | PREVAILING TORQUE WITH METALLIC INSERT |
| Center to Center Distance Between Mounting Holes Along Length | 0.555 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Nut Height | 0.869 INCHES NOMINAL IN |
| Surface Treatment | CHROMATE SHELL |
| Surface Treatment | ZINC LOCKING INSERT |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL CORROSION RESISTING LOCKING INSERT |
| Material | ALUMINUM ALLOY 2219 SHELL |
| Nut Mounting Provision | STRAIGHT HOLES |
| 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 |
|---|---|
| ST4M133-3-40 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| WSI333-40D | 5/9 Secondary reference Atlas Corp Western Sky Industries Div |
NSN 5310-00-326-5256 is a Nut,self-Locking,plate, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-326-5256 has 1 manufacturer part number on file: ST4M133-3-40 (The Boeing Company Div Defense).
Key specifications for ST4M133-3-40: Plate Thickness: 0.040 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN; Nut Length: 1.460 INCHES MINIMUM AND 1.480 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-C-5541 MIL SPEC SINGLE TREATMENT RESPONSE SHELL; Thread Series: UNF. 25 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.