The Washer,recessed, cataloged under National Stock Number 5310-01-101-4948, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-101-4948 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Top Recess Diameter | 0.308 INCHES NOMINAL IN |
| Bottom Recess Diameter | 0.308 INCHES NOMINAL IN |
| Hardness Rating | 29.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| Top Recess Angle | 90.0 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Material Document and Classification | AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5737 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Material Thickness | 0.075 INCHES MINIMUM AND 0.085 INCHES MAXIMUM IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Hole Diameter | 0.252 INCHES MINIMUM AND 0.260 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 |
| Reference | Meaning |
|---|---|
| MS9768-10 | 2/2 Government specification standardization U.S. Government activity |
| 10122139 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 5310PL0211602 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5310-01-101-4948 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-01-512-5977. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-101-4948: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Top Recess Diameter: 0.308 INCHES NOMINAL IN; Bottom Recess Diameter: 0.308 INCHES NOMINAL IN. 12 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.