The Stud,shouldered, cataloged under National Stock Number 5307-01-240-0893, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 20 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-01-240-0893 |
| Primary Part Number | 55A40B9-1 |
| Item Name | Stud,shouldered |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Thread Length | 0.440 INCHES NOMINAL STUD THREAD IN |
| Thread Length | 0.440 INCHES NOMINAL NUT THREAD IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Style Designator | SHOULDERED |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE |
| Thread Direction | RIGHT-HAND STUD THREAD |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Nominal Thread Size | 0.437 INCHES STUD THREAD IN |
| Nominal Thread Size | 0.437 INCHES NUT THREAD IN |
| Shoulder Diameter | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 2A STUD THREAD A |
| Thread Class | 2A NUT THREAD A |
| Thread Quantity Per Inch | 20 NUT THREAD |
| Thread Quantity Per Inch | 20 STUD THREAD |
| Material | STEEL COMP E4340 |
| Distance Across Flats | 0.434 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Shoulder Length | 1.370 INCHES MINIMUM AND 1.380 INCHES MAXIMUM IN |
| Thread Series Designator | UNF STUD THREAD |
| Thread Series Designator | UNF NUT THREAD |
| 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 |
|---|---|
| 55A40B9-1 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 5307-01-240-0893 is a Stud,shouldered, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5307, Studs. Status: active.
NSN 5307-01-240-0893 has 1 manufacturer part number on file: 55A40B9-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 55A40B9-1: Thread Length: 0.440 INCHES NOMINAL STUD THREAD IN; Thread Length: 0.440 INCHES NOMINAL NUT THREAD IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM; Style Designator: SHOULDERED. 20 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.