The Washer,flat, cataloged under National Stock Number 5310-01-242-5993, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Kohler Co Engine Plant Div. Government technical data includes 8 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-242-5993 |
| Primary Part Number | X-25-15 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Kohler Co Engine Plant Div |
| Status | ACTIVE |
| Overall Diameter | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.646 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN |
| Thickness | 0.115 INCHES MINIMUM AND 0.135 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 |
|---|---|
| X-25-15 PRIMARY | Kohler Co Engine Plant Div (USA) |
| X-25-15 | Hancox Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 81-5757 | 5/9 Secondary reference Countryman Group Ltd |
| 81-5757 | 5/9 Secondary reference Winder Power Limited |
| A-25 468 00 | D/9 Drawing number reference only Kohler Co Engine Plant Div |
NSN 5310-01-242-5993 is a Washer,flat, manufactured by Kohler Co Engine Plant Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-242-5993 has 2 manufacturer part numbers on file: X-25-15 (Kohler Co Engine Plant Div), X-25-15 (Hancox Ltd).
3 possible matches (shared part number, not a government interchangeability claim): 5310-01-242-5994, 5935-01-480-5373, 5935-01-480-5381. Verify interchangeability with system specifications before substitution.
Key specifications for X-25-15: Overall Diameter: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC OVERALL; 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.