The Washer,recessed, cataloged under National Stock Number 5310-01-436-9977, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-436-9977 |
| Primary Part Number | 581-6405752 FIND AHNA-B8 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Style Designator | RECESSED BOTH SIDES |
| Outside Diameter | 0.880 INCHES NOMINAL IN |
| Material Thickness | 0.125 INCHES NOMINAL IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Countersink Angle | 90.0 DEGREES NOMINAL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.4994 INCHES MINIMUM AND 0.5005 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 |
|---|---|
| 581-6405752 FIND AHNA-B8 PRIMARY | Naval Sea Systems Command (USA) |
| 64111405-B8 | Naval Sea Systems Command (USA) |
NSN 5310-01-436-9977 is a Washer,recessed, manufactured by Naval Sea Systems Command, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-436-9977 has 2 manufacturer part numbers on file: 581-6405752 FIND AHNA-B8 (Naval Sea Systems Command), 64111405-B8 (Naval Sea Systems Command).
Key specifications for 581-6405752 FIND AHNA-B8: Style Designator: RECESSED BOTH SIDES; Outside Diameter: 0.880 INCHES NOMINAL IN; Material Thickness: 0.125 INCHES NOMINAL IN; Bottom Recess Angle: 90.0 DEGREES NOMINAL. 7 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.