The Washer,flat, cataloged under National Stock Number 5310-01-459-3855, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Oshkosh Defense Llc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-459-3855 |
| Primary Part Number | 138HX |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Oshkosh Defense Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-Z-325, CL B, TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.750 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.688 INCHES NOMINAL IN |
| Thickness | 0.134 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 |
|---|---|
| 138HX PRIMARY | Oshkosh Defense Llc (USA) |
| Reference | Meaning |
|---|---|
| 138HX | 5/9 Secondary reference Oshkosh Corp |
NSN 5310-01-459-3855 is a Washer,flat, manufactured by Oshkosh Defense Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-459-3855 has 1 manufacturer part number on file: 138HX (Oshkosh Defense Llc).
Key specifications for 138HX: Surface Treatment Document and Classification: QQ-Z-325, CL B, TY 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.750 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: ZINC AND CHROMATE OVERALL. 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.