The Washer,flat, cataloged under National Stock Number 5310-00-641-9204, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Tactair Fluid Controls Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-00-641-9204 |
| Primary Part Number | HPC176102 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Tactair Fluid Controls Inc |
| Status | ACTIVE |
| Overall Diameter | 0.612 INCHES MINIMUM AND 0.622 INCHES MAXIMUM IN |
| Hardness Rating | 33.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 440A OVERALL A |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.408 INCHES MINIMUM AND 0.418 INCHES MAXIMUM IN |
| Thickness | 0.037 INCHES MINIMUM AND 0.043 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 |
|---|---|
| HPC176102 PRIMARY | Tactair Fluid Controls Inc (USA) |
| Reference | Meaning |
|---|---|
| HPC176102 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-641-9204 is a Washer,flat, manufactured by Tactair Fluid Controls Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-641-9204 has 1 manufacturer part number on file: HPC176102 (Tactair Fluid Controls Inc).
Key specifications for HPC176102: Overall Diameter: 0.612 INCHES MINIMUM AND 0.622 INCHES MAXIMUM IN; Hardness Rating: 33.0 ROCKWELL C MINIMUM AND 35.0 ROCKWELL C MAXIMUM; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 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.