The Washer,recessed, cataloged under National Stock Number 5310-00-550-1383, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Emerson Electric Co Alco Controls Div. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-550-1383 |
| Primary Part Number | 2318-49-1 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Emerson Electric Co Alco Controls Div |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES COUNTERBORE FACE |
| Surface Finish | 63.0 MICROINCHES TOP |
| Heat Treatment | AS FABRICATED |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.807 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN |
| Recess Depth | 0.044 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN |
| Material Thickness | 0.167 INCHES MINIMUM AND 0.177 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 410 OR STEEL COMP 416 OVERALL |
| Hole Diameter | 0.438 INCHES MINIMUM AND 0.442 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 |
|---|---|
| 2318-49-1 PRIMARY | Emerson Electric Co Alco Controls Div (USA) |
| Reference | Meaning |
|---|---|
| W20874 | 5/9 Secondary reference Emerson Electric Co Alco Controls Div |
NSN 5310-00-550-1383 is a Washer,recessed, manufactured by Emerson Electric Co Alco Controls Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-550-1383 has 1 manufacturer part number on file: 2318-49-1 (Emerson Electric Co Alco Controls Div).
Key specifications for 2318-49-1: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES COUNTERBORE FACE; Surface Finish: 63.0 MICROINCHES TOP; Overall Height: 0.169 INCHES MINIMUM AND 0.173 INCHES MAXIMUM IN. 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.