---
type: product
schema_version: 1
stock_number: "51004-1"
canonical_url: "https://www.artisantg.com/51004-1/Keysight-Q281A"
json_url: "https://www.artisantg.com/51004-1/Keysight-Q281A.json"
generated_at: "2026-11-06T23:33:26.962Z"
last_updated: "2026-09-30T05:35:41.367-05:00"
---

# Keysight Q281A Millimeter Waveguide-to-Coax Adapter

_Summary and Categories are this item's record. The description sections and FAQ are machine-assisted and can contain errors; where they disagree with the record, the record is correct, and where description sections disagree with each other, Details wins._

## Summary

- Manufacturer: Keysight
- Model: Q281A
- Condition: New From Surplus Stock
- Price: Quote only
- Availability: In stock
- Warranty: 1-Year Warranty with 30-Day Return Guarantee
- ITAR restricted: No
- Shipping weight: 1 lb, estimated
- Shipping dimensions: 8X8X3 in, estimated

## Categories

- Test Equipment > Electrical Test > Adapters (primary)
- Test Equipment > Optical Test > Adapters

## Details

### Configuration

- Coax Connector Type: 2.4 mm (f)
- Waveguide Number: WR-22
- Frequency: 33 to 50 GHz
- Return Loss: ≥ 22 dB
- Insertion Loss: ≤ 0.3 dB
- Repeatability Typically Better Than: ≥ -50 dB

### Includes

- (2) Metal Pins; Part Number: 11644-20006
- (6) Metal Screws; Part Number: 1390-0671

## Images

- <https://www.artisantg.com/itemimages/keysight_q281a_view1_2025318152518.jpg>
- <https://www.artisantg.com/itemimages/keysight_q281a_view2_2025318152518.jpg>
- <https://www.artisantg.com/itemimages/keysight_q281a_view3_2025318152518.jpg>
- <https://www.artisantg.com/itemimages/keysight_q281a_view4_2025318152518.jpg>
- <https://www.artisantg.com/itemimages/keysight_q281a_view5_2025318152518.jpg>