Is this a after market cartridge?

I don't think it is after-market - it comes in original HP packaging and appears to me to be an original HP part.

is this new oem toner cartridge?

Yes, it is OEM. Been using them in an HP Laserjet 4250 for years without a problem. It's a great printer and I won't risk using third party toners. Also cheaper than local office stores.

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HP 42X High Yield LaserJet Toner Cartridge - Black

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Option: Q5942X

Q5942A
Q5942X
Q5942XD

Black
Model #: Q5942X
Single Pack
Approx page yield per cartridge: 20000
Compatible with: HP LaserJet 4240, 4250, 4350 Series

Please note that this product is non-returnable and non-refundable.

Overview

Specs

Reviews (9)

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HP delivers sharp text and consistent, professional results throughout the lifespan of the cartridge. Smooth toner particles produce true HP LaserJet print quality—clear, sharp text characters, smooth grayscales, and deep blacks. Consistently produces outstanding print quality. Device Types: Laser Printer; Color(s): Black; Page-Yield: 20000; Supply Type: Toner.

Model
Brand	HP
Model	HP 42X (Q5942X)

Details
Cartridge Quantity	Single Pack
Cartridge Color	Black
Replacement Model	HP 42A (Q5942A)
Compatible Products	HP LaserJet 4240, 4250, 4350 Series
Approximate Page Yield	20000 Pages

Environmental
Operating Humidity	10 to 80% RH
Storage Humidity	10 to 90% RH
Operating Temperature	50 to 90.5°F
Storage Temperature	-4 to 104°F

Features
Features	Get true HP LaserJet print quality with advanced toner formula and print cartridge technology in the HP LaserJet Q5942A/X Black Print Cartridges with Smart printing technology. HP delivers sharp black text and consistent, professional results for as long as the cartridge lasts. Work smart. HP Smart printing technology makes automatic adjustments to optimize print quality and enhance reliability. The cost-effective HP Q5942A/X Black Print Cartridges with Smart printing technology provide reliable operation to minimize user intervention and improve productivity. Enjoy low maintenance, trouble-free printing. HP Smart technology in the print cartridge and your printer makes HP supplies easy to install and maintain. Receive automatic alerts when a cartridge is low or out. Enjoy convenient, on-line ordering.

Additional Information
First Listed on Newegg	March 18, 2005

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
Read full details

Return Policies

Return for refund within: non-refundable

Return for replacement within: non-replaceable

Read full return policy for details.

HP 42X High Yield LaserJet Toner Cartridge - Black

Learn more about the HP HP 42X (Q5942X)

Customer Reviews of the HP HP 42X (Q5942X)

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16817102181

HP 42X High Yield LaserJet Toner Cartridge - Black

Learn more about the HP HP 42X (Q5942X)

Customer Reviews of the HP HP 42X (Q5942X)

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info