The Washer,concave, cataloged under National Stock Number 5310-01-445-6877, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-445-6877 |
| Primary Part Number | 03A350CC4CB |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN |
| Material Thickness | 0.070 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 631 OR STEEL COMP 630 OVERALL |
| Hole Diameter | 0.358 INCHES MINIMUM AND 0.368 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 |
|---|---|
| 03A350CC4CB | Monadnock Company, the Dba Lisi Aerospace (USA) |
| 03A350CC4CB | Buda Precision Inc. Dba Buda Precision Grinding (USA) |
| 03A350CC4CB | Howmet Global Fastening Systems Inc (USA) |
| 03A350CC4CB PRIMARY | Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems (USA) |
| 03A350CC4CB | Sps Technologies, Llc Dba PB Fasteners (USA) |
NSN 5310-01-445-6877 is a Washer,concave, manufactured by Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-445-6877 has 5 manufacturer part numbers on file: 03A350CC4CB (Monadnock Company, the Dba Lisi Aerospace), 03A350CC4CB (Buda Precision Inc. Dba Buda Precision Grinding), 03A350CC4CB (Howmet Global Fastening Systems Inc), 03A350CC4CB (Northrop Grumman Systems Corp Dba Northrop Grumman Computing Systems), 03A350CC4CB (Sps Technologies, Llc Dba PB Fasteners).
Key specifications for 03A350CC4CB: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.360 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM; Style Designator: CONCAVE. 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.