The Washer,lock, cataloged under National Stock Number 5310-01-210-7453, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Allmetal Screw Products Corp. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-210-7453 |
| Primary Part Number | 1MEDSS |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Allmetal Screw Products Corp |
| Status | ACTIVE |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Outside Diameter | 0.150 INCHES MAXIMUM IN |
| Material Thickness | 0.015 INCHES MINIMUM IN |
| Material | STEEL COMP 302 OR STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 303CU OR STEEL COMP 303PB OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 304H OVERALL |
| Hole Diameter | 0.075 INCHES MINIMUM 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 |
|---|---|
| 1MEDSS PRIMARY | Allmetal Screw Products Corp (USA) |
| Reference | Meaning |
|---|---|
| A19801G | 5/9 Secondary reference Allmetal Screw Products Corp |
NSN 5310-01-210-7453 is a Washer,lock, manufactured by Allmetal Screw Products Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-210-7453 has 1 manufacturer part number on file: 1MEDSS (Allmetal Screw Products Corp).
Key specifications for 1MEDSS: Style Designator: SPLIT HELICAL-RIGHT HAND; Outside Diameter: 0.150 INCHES MAXIMUM IN; Material Thickness: 0.015 INCHES MINIMUM IN; Part Name Assigned by Controlling Agency: NAVY SPECIAL PROJECT. 5 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.