The Washer,flat, cataloged under National Stock Number 5310-01-644-1539, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Washer,flat |
| FSC / FSG | 5310 — Nuts and Washers (FSG 53) |
| Manufacturers | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 5310-01-644-1539 |
| Primary Part Number | 709-8345731 ITEM 202D4 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 709-8345731 ITEM 202D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| DDSPY-0004-H-09D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| OIIMSD-0126-A-10D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 1.250ODX0.531IDX0.250 CRESD4 | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 709-8345731 ITEM 202 | 3/1 Design control — primary reference Naval Sea Systems Command |
| 709-5343924 ITEM 058D4 | 5/9 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 709-5343924 ITEM 058 | 5/9 Secondary reference Naval Sea Systems Command |
| OIIMSD-0126-A-10 | 5/1 Secondary reference Naval Sea Systems Command |
| 1.250ODX0.531IDX0.250 CRES | 5/9 Secondary reference U.S. Government activity |
| DDSPY-0004-H-09 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 5310-01-644-1539 is a Washer,flat, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-644-1539 has 3 manufacturer part numbers on file: 709-8345731 ITEM 202D4 (Naval Inventory Control Point Mechanicsburg), DDSPY-0004-H-09D4 (Naval Inventory Control Point Mechanicsburg), OIIMSD-0126-A-10D4 (Naval Inventory Control Point Mechanicsburg).
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.