The Lexmark T640 remanufactured black toner cartridge from Castle Ink is a direct replacement for the OEM Lexmark T640, built for Lexmark mono or color laser and inkjet printers. It’s an economical way to keep your printer in service without paying full OEM prices, while still meeting the print-quality standards your team expects.The T640 delivers dense, dark black for sharp text, line work and reliable bar-code scanning. Castle Ink uses finely ground monochrome toner with consistent particle size so output looks crisp at first print and stays consistent through the life of the cartridge. Every T640 is assembled with a fresh imaging chip (where applicable), color-balanced toner powder, then individually tested before shipping. Castle Ink backs every T640 with a 100% satisfaction guarantee: if you aren’t happy with quality or yield, we replace or refund it.Compatible Lexmark Printers Lexmark T642 Lexmark T640 Lexmark T640 dn Lexmark T640 dtn Lexmark T640 tn Lexmark T642 dn Lexmark T642 dtn Lexmark T642 n Lexmark T642 tn Lexmark T644 Lexmark T644 dn Lexmark T644 dtn Lexmark T644 n Lexmark T644 tn Product Specifications SKU: T640 OEM Reference: Lexmark T640 Color: Black Cartridge Type: Remanufactured (non-OEM) Format: Laser Toner Brand Compatibility: Lexmark Warranty: Castle Ink 100% satisfaction guarantee Shipping: Free U.S. shipping; same-day dispatch on orders before 2pm ET Frequently Asked QuestionsWill the T640 void my Lexmark printer warranty? No. Under the U.S. Magnuson-Moss Warranty Act, your printer manufacturer cannot void your warranty solely because you installed a compatible (non-OEM) cartridge.How does print quality compare to the genuine Lexmark T640? The T640 is engineered to match the OEM cartridge’s particle size, charge profile and toner densities so day-to-day output should look essentially identical. If you ever see a difference, our satisfaction guarantee covers a free replacement or refund.How fast will my order ship? Orders placed before 2pm ET ship the same business day from our U.S. warehouse with free standard shipping. Expedited options are available at checkout.
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