The Washer,flat, cataloged under National Stock Number 5310-01-603-7777, 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 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-01-603-7777 |
| Primary Part Number | 4M307-7-79 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Anillo Industries Llc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-5541, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Diameter | 2.234 INCHES NOMINAL IN |
| Material Document and Classification | QQ-A-250/11, COND T6 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | ALUMINUM ALLOY 6061 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 1.234 INCHES NOMINAL IN |
| Thickness | 0.023 INCHES MINIMUM AND 0.027 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 |
|---|---|
| 4M307-7-79 PRIMARY | Anillo Industries Llc (USA) |
| 4M307-7-79 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 4M307-7-79 | 5/9 Secondary reference Trico Manufacturing Inc. |
| 4M307 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 5310-01-603-7777 is a Washer,flat, manufactured by Anillo Industries Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-603-7777 has 2 manufacturer part numbers on file: 4M307-7-79 (Anillo Industries Llc), 4M307-7-79 (The Boeing Company Div Defense).
6 possible matches (shared part number, not a government interchangeability claim): 5310-01-629-8517, 5310-01-718-7771, 5310-01-719-8390. Verify interchangeability with system specifications before substitution.
Key specifications for 4M307-7-79: Surface Treatment Document and Classification: MIL-C-5541, CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Overall Diameter: 2.234 INCHES NOMINAL IN; Material Document and Classification: QQ-A-250/11, COND T6 FED STD 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.