The Washer,flat, cataloged under National Stock Number 5310-00-209-0552, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Bogen Communications Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 5310-00-209-0552 |
| Primary Part Number | 105-660 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Bogen Communications Inc |
| Status | ACTIVE |
| Overall Diameter | 0.438 INCHES NOMINAL IN |
| Cross-Sectional Shape Style | RECTANGULAR |
| Surface Treatment | NICKEL OVERALL |
| Peripheral Shape Style | ROUND |
| Material | COPPER ALLOY OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.151 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN |
| Thickness | 0.036 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 |
|---|---|
| 512-101N | Keysight Technologies Inc (USA) |
| 3050-0071 | Keysight Technologies Inc (USA) |
| 512-101 | Keysight Technologies Inc (USA) |
| 105-660 PRIMARY | Bogen Communications Inc (USA) |
| Reference | Meaning |
|---|---|
| 3050-0071 | 5/9 Secondary reference Keysight Technologies, Inc. |
| 8X7-16IN0DX031INTHK | 5/9 Secondary reference Federal Screw Products, Inc. |
| 3050-0071 | 5/9 Secondary reference Hewlett-Packard Company Dba HP |
| 149037-2 | 3/2 Design control — primary reference U.S. Government activity |
| 512-101N | 5/9 Secondary reference Keysight Technologies, Inc. |
| 512-101 | 5/9 Secondary reference Keysight Technologies, Inc. |
| 512-101 | 5/9 Secondary reference Hewlett-Packard Company Dba HP |
| 512-101N | 5/9 Secondary reference Hewlett-Packard Company Dba HP |
| 1452 | 5/9 Secondary reference Federal Screw Products, Inc. |
| 1452ADX | 5/9 Secondary reference Airdale Express Llc Div Airdale Express |
| H1230-31 | 5/9 Secondary reference Dowty Rfl Industries Inc |
NSN 5310-00-209-0552 is a Washer,flat, manufactured by Bogen Communications Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-209-0552 has 4 manufacturer part numbers on file: 512-101N (Keysight Technologies Inc), 3050-0071 (Keysight Technologies Inc), 512-101 (Keysight Technologies Inc), 105-660 (Bogen Communications Inc).
4 possible matches (shared part number, not a government interchangeability claim): 5905-00-815-3425, 4820-00-911-7989, 5845-01-537-4495. Verify interchangeability with system specifications before substitution.
Key specifications for 105-660: Overall Diameter: 0.438 INCHES NOMINAL IN; Cross-Sectional Shape Style: RECTANGULAR; Surface Treatment: NICKEL OVERALL; Peripheral Shape Style: ROUND. 8 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.