The Washer,flat, cataloged under National Stock Number 5310-01-377-6175, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Anillo Industries Llc. Government technical data includes 10 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-377-6175 |
| Primary Part Number | HS306-126 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Anillo Industries Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416TYPE2,CLASS2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 0.609 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1020 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.256 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Thickness | 0.031 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 |
|---|---|
| HS306-126 PRIMARY | Anillo Industries Llc (USA) |
| HS306-126 PRIMARY | Pac Zonamatic Inc (USA) |
| Reference | Meaning |
|---|---|
| HS306-126 | 5/9 Secondary reference Mcdonnell Douglas Helicopter Co Inc |
| HS306-126 | 3/2 Design control — primary reference U.S. Government activity |
| HS306-126 | 7/2 Vendor item drawing reference The Boeing Company |
NSN 5310-01-377-6175 is a Washer,flat, manufactured by Anillo Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-377-6175 has 2 manufacturer part numbers on file: HS306-126 (Anillo Industries Llc), HS306-126 (Pac Zonamatic Inc).
Key specifications for HS306-126: Surface Treatment Document and Classification: QQ-P-416TYPE2,CLASS2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 0.609 INCHES MINIMUM AND 0.629 INCHES MAXIMUM IN; Material Document and Classification: MIL-S-7952 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR. 10 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.