The Washer,flat, cataloged under National Stock Number 5310-01-254-9175, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mid-Continent Instrument Co Inc. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-254-9175 |
| Primary Part Number | 1288-146 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mid-Continent Instrument Co Inc |
| Status | ACTIVE |
| Overall Diameter | 0.738 INCHES MINIMUM AND 0.745 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5059,HARD MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 301 OR STEEL COMP 302 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.385 INCHES NOMINAL IN |
| Thickness | 0.0195 INCHES MINIMUM AND 0.0205 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 |
|---|---|
| 1288-146 PRIMARY | Mid-Continent Instrument Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 1288-146 | 5/9 Secondary reference Grimes Aerospace Company |
NSN 5310-01-254-9175 is a Washer,flat, manufactured by Mid-Continent Instrument Co Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-254-9175 has 1 manufacturer part number on file: 1288-146 (Mid-Continent Instrument Co Inc).
Key specifications for 1288-146: Overall Diameter: 0.738 INCHES MINIMUM AND 0.745 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-5059,HARD MIL SPEC ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 8 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.