The Washer,recessed, cataloged under National Stock Number 5310-01-197-4491, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-197-4491 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TYPE 2,CLASS1 FED SPEC 1ST TREATMENT RESPONSE OR ASTM B633,CLASS FE/ZN 13,TYPE 2 ASSN STD 2ND TREATMENT RESPONSE OVERALL |
| Style Designator | RECESSED |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 4.500 INCHES NOMINAL IN |
| Material Thickness | 0.250 INCHES NOMINAL IN |
| Recess Diameter | 3.150 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM AND CHROMATE OR ZINC AND CHROMATE OVERALL |
| Material | STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1023 OR STEEL COMP 1025 OVERALL |
| Hole Diameter | 2.690 INCHES NOMINAL IN |
| Recess Angle | 90.0 DEGREES NOMINAL |
| 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 |
|---|---|
| 13211E8627 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-197-4491 is a Washer,recessed, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-197-4491: Surface Treatment Document and Classification: QQ-P-416,TYPE 2,CLASS1 FED SPEC 1ST TREATMENT RESPONSE OR ASTM B633,CLASS FE/ZN 13,TYPE 2 ASSN STD 2ND TREATMENT RESPONSE OVERALL; Style Designator: RECESSED; Material Document and Classification: ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OR ASTM A576 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 4.500 INCHES NOMINAL IN. 10 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.