The Washer,flat, cataloged under National Stock Number 5310-00-941-9641, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Columbus Jack Corporation Div Columbus Jack. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-941-9641 |
| Primary Part Number | 491755 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Columbus Jack Corporation Div Columbus Jack |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 90.0 MICROINCHES OUTER |
| Surface Finish | 63.0 MICROINCHES TOP |
| Surface Finish | 90.0 MICROINCHES INNER |
| Overall Diameter | 0.550 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN |
| Hardness Rating | 30.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 5542 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | PASSIVATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | NICKEL ALLOY X-750 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.251 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Thickness | 0.089 INCHES MINIMUM AND 0.099 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 |
|---|---|
| 491755 PRIMARY | Columbus Jack Corporation Div Columbus Jack (USA) |
| Reference | Meaning |
|---|---|
| 491755 | 7/2 Vendor item drawing reference Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| 491755 | 5/9 Secondary reference Age Logistics Corporation |
NSN 5310-00-941-9641 is a Washer,flat, manufactured by Columbus Jack Corporation Div Columbus Jack, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-941-9641 has 1 manufacturer part number on file: 491755 (Columbus Jack Corporation Div Columbus Jack).
Key specifications for 491755: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 90.0 MICROINCHES OUTER; Surface Finish: 63.0 MICROINCHES TOP; Surface Finish: 90.0 MICROINCHES INNER. 14 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.