The Washer,flat, cataloged under National Stock Number 5310-01-073-2948, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hornet Acquisitionco, Llc Dba Onboard Systems. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-073-2948 |
| Primary Part Number | 42277-518 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hornet Acquisitionco, Llc Dba Onboard Systems |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416 CL 1 TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 1.370 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 4340 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.600 INCHES MINIMUM AND 0.650 INCHES MAXIMUM IN |
| Thickness | 0.050 INCHES MINIMUM AND 0.060 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 |
|---|---|
| 42277-518 PRIMARY | Hornet Acquisitionco, Llc Dba Onboard Systems (USA) |
| Reference | Meaning |
|---|---|
| 42277C518 | 5/9 Secondary reference U.S. Government activity |
| 42277C518 | 5/9 Secondary reference Goodrich Corporation Dba Trw Lucas Aerospace |
NSN 5310-01-073-2948 is a Washer,flat, manufactured by Hornet Acquisitionco, Llc Dba Onboard Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-073-2948 has 1 manufacturer part number on file: 42277-518 (Hornet Acquisitionco, Llc Dba Onboard Systems).
Key specifications for 42277-518: Surface Treatment Document and Classification: QQ-P-416 CL 1 TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 1.370 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM; Material Document and Classification: MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 11 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.