The Key,machine, cataloged under National Stock Number 5315-01-376-1031, is classified within Federal Supply Class 5315 (Nails, Machine Keys, and Pins) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5315-01-376-1031 |
| Primary Part Number | 243-6408950 FIND 18 |
| Item Name | Key,machine |
| FSC / FSG | 5315 / 53 — Nails, Machine Keys, and Pins |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Key Chamfer Angle | 90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL |
| Mounting Hole Type and Quantity | 1 THREADED-COUNTERBORED1 THREADED-COUNTERBORED |
| Starting Edge Shape | CHAMFEREDCHAMFERED |
| Style Designator | OCTAGON SHAPEOCTAGON SHAPE |
| Mounting Hole Diameter | 0.533 INCHES MINIMUM AND 0.533 INCHES MINIMUM AND 0.539 INCHES MAXIMUM0.539 INCHES MAXIMUM IN |
| Distance From Mounting Hole Center to End | 1.680 INCHES NOMINAL1.680 INCHES NOMINAL IN |
| Counterbore Depth | 1.870 INCHES NOMINAL1.870 INCHES NOMINAL IN |
| Mounting Hole Thread Class | 2B2B |
| Key Chamfer Length | 3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN |
| Counterbore Diameter | 1.000 INCHES NOMINAL1.000 INCHES NOMINAL IN |
| Mounting Hole Nominal Thread Size | 0.625 INCHES0.625 INCHES IN |
| Mounting Hole Depth | 1.870 INCHES NOMINAL1.870 INCHES NOMINAL IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 243-6408950 FIND 18 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 211055245 | 5/9 Secondary reference Naval Sea Systems Command |
NSN 5315-01-376-1031 is a Key,machine, manufactured by Naval Sea Systems Command, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-01-376-1031 has 1 manufacturer part number on file: 243-6408950 FIND 18 (Naval Sea Systems Command).
Key specifications for 243-6408950 FIND 18: Overall Height: 3.744 INCHES MINIMUM AND 3.744 INCHES MINIMUM AND 3.746 INCHES MAXIMUM3.746 INCHES MAXIMUM IN; Key Chamfer Angle: 90.0 DEGREES NOMINAL90.0 DEGREES NOMINAL; Mounting Hole Type and Quantity: 1 THREADED-COUNTERBORED1 THREADED-COUNTERBORED; Starting Edge Shape: CHAMFEREDCHAMFERED. 13 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.