The Washer,lock, cataloged under National Stock Number 5310-00-111-3671, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-111-3671 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Heat Treatment | ANNEALED |
| Style Designator | FLAT EXTERNAL TEETH |
| Material Document and Classification | QQ-S-766 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-766 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-766 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-766 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 5TH MATERIAL RESPONSE OR QQ-W-423 FED SPEC 5TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 6TH MATERIAL RESPONSE OR QQ-W-423 FED SPEC 6TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 7TH MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN |
| Material Thickness | 0.028 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 2 TYPE AND 1 STYLE AND 2 STYLE AND A GRADE |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 202 OR STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 310 OR STEEL COMP 316 OR STEEL COMP 321 OVERALL |
| Hole Diameter | 0.320 INCHES MINIMUM AND 0.332 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 |
|---|---|
| FFW100 | 4/1 Identification reference U.S. Government activity |
| MS16213-62 | 2/2 Government specification standardization U.S. Government activity |
NSN 5310-00-111-3671 is a Washer,lock, classified under FSC 5310, Nuts and Washers. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-450-8430, 5310-01-570-3761. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-00-111-3671: Heat Treatment: ANNEALED; Style Designator: FLAT EXTERNAL TEETH; Material Document and Classification: QQ-S-766 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-766 FED SPEC 2ND MATERIAL RESPONSE OR QQ-S-766 FED SPEC 3RD MATERIAL RESPONSE OR QQ-S-766 FED SPEC 4TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 5TH MATERIAL RESPONSE OR QQ-W-423 FED SPEC 5TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 6TH MATERIAL RESPONSE OR QQ-W-423 FED SPEC 6TH MATERIAL RESPONSE OR QQ-S-766 FED SPEC 7TH MATERIAL RESPONSE OVERALL; Outside Diameter: 0.588 INCHES MINIMUM AND 0.610 INCHES MAXIMUM IN. 9 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.