The Washer,flat, cataloged under National Stock Number 5310-00-374-4058, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sealcraft Corporation. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-374-4058 |
| Primary Part Number | H260K213 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sealcraft Corporation |
| Status | ACTIVE |
| Overall Diameter | 3.375 INCHES NOMINAL IN |
| Material Document and Classification | C-F-206,TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Minimum Tensile Strength | 200 POUNDS PER SQUARE INCH LBS |
| Peripheral Shape Style | ROUND |
| Material | WOOL COMP 9R2 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 2.375 INCHES NOMINAL IN |
| Thickness | 0.250 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5310-00-374-4058 is a Washer,flat, manufactured by Sealcraft Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-374-4058 has 2 manufacturer part numbers on file: H260K213 (Sealcraft Corporation), 42850 (Dana Automotive Systems Group, Llc Dba Dana Sealing Products).
2 possible matches (shared part number, not a government interchangeability claim): 3110-00-554-3248, 5307-01-484-2615. Verify interchangeability with system specifications before substitution.
Key specifications for H260K213: Overall Diameter: 3.375 INCHES NOMINAL IN; Material Document and Classification: C-F-206,TYPE 1 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Minimum Tensile Strength: 200 POUNDS PER SQUARE INCH LBS. 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.