The Washer,flat, cataloged under National Stock Number 5310-01-475-3815, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Seastrom Inc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5310-01-475-3815 |
| Primary Part Number | 5612-8-31 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Seastrom Inc |
| Status | ACTIVE |
| Overall Diameter | 0.248 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.110 INCHES NOMINAL IN |
| Thickness | 0.031 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 |
| Part Number | Manufacturer |
|---|---|
| 43-00564 | Luminescent Systems, Inc Dba Lsi Div Luminescent Systems, Inc, Ny (USA) |
| 43-00564-001 | Luminescent Systems, Inc Dba Lsi Div Luminescent Systems, Inc, Ny (USA) |
| 5612-8-31 PRIMARY | Seastrom Inc (USA) |
NSN 5310-01-475-3815 is a Washer,flat, manufactured by Seastrom Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-475-3815 has 3 manufacturer part numbers on file: 43-00564 (Luminescent Systems, Inc Dba Lsi Div Luminescent Systems, Inc, Ny), 43-00564-001 (Luminescent Systems, Inc Dba Lsi Div Luminescent Systems, Inc, Ny), 5612-8-31 (Seastrom Inc).
1 possible match (shared part number, not a government interchangeability claim): 5895-01-490-6639. Verify interchangeability with system specifications before substitution.
Key specifications for 5612-8-31: Overall Diameter: 0.248 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND; End Item Identification: BLOCK 50:WSD;F-16 AIRCRAFT. 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.