The Washer,flat, cataloged under National Stock Number 5310-01-097-3605, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Sippican, Inc. Div Communication Division. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-097-3605 |
| Primary Part Number | B135726-1 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Lockheed Martin Sippican, Inc. Div Communication Division |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Overall Diameter | 5.000 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC, POLYETHYLENE (PP) OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 3.000 INCHES NOMINAL IN |
| Thickness | 0.120 INCHES MINIMUM AND 0.123 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 |
| Part Number | Manufacturer |
|---|---|
| B135726-1 PRIMARY | Lockheed Martin Sippican, Inc. Div Communication Division (USA) |
NSN 5310-01-097-3605 is a Washer,flat, manufactured by Lockheed Martin Sippican, Inc. Div Communication Division, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-097-3605 has 1 manufacturer part number on file: B135726-1 (Lockheed Martin Sippican, Inc. Div Communication Division).
Key specifications for B135726-1: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Overall Diameter: 5.000 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR. 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.