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SKU : 29S0100

Brand : Lexmark

Monochrome Laser

Duplex (2-sided) Printing: Integrated Duplex

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Light, compact, and fast, the MS331dn supports output up to 40 pages per minute, multiple connectivity options, and an optional 550-sheet paper tray.

Save paper, save energy

Automatic two-sided printing is standard, along with built-in energy-saving modes that help support ratings of EPEAT® Silver and ENERGY STAR® certified. The Lexmark Cartridge Collection Program (LCCP) and Lexmark Equipment Collection Program (LECP) minimize waste and support recycling (availability varies by country).

Output that fits

Measuring just 8.7 inches high x 14.5 inches wide x 14.3 inches deep (222 mm high x 368 mm wide x 363 mm deep), the business-class MS431dw fits almost anywhere. Its compact size and light weight make it easy to set up and easy to move.

Print more, stop less

In addition to a first page as fast as 5.9 seconds and output up to 42 pages per minute*, available Extra High Yield Unison™ toner provides up to 20,000 pages** of output. Add an optional paper tray that increases total input capacity up to 900 sheets for more printing and less downtime.

Flexible connectivity

In addition to Ethernet and USB, built-in Wi-Fi makes it easy for mobile users to get output via the Lexmark Mobile Print app, as well as Mopria®, AirPrint and Google Cloud Print. And the Lexmark Mobile Assistant app simplifies wireless configuration.

Full-spectrum security

Lexmark’s comprehensive approach to product security is a design and engineering mandate across our entire product portfolio. Our security features help keep your information safe—in the document, on the device, over the network, and at all points in between.

Hands-off durability

With its steel frame and lifetime fuser, the MS431dw is built to last.

Additional information

Workgroup Size

Small Workgroup


2-line All Points Addressable (APA) monochrome LCD display

Media Sizes Supported

A6, Oficio, 7 3/4 Envelope, 9 Envelope, JIS-B5, A4, Legal, A5, Letter, B5 Envelope, Statement, C5 Envelope, Executive, Universal, DL Envelope, Folio, 10 Envelope

Included Paper Handling

100-Sheet Multipurpose Feeder, Integrated Duplex, 150-Sheet Output Bin, 250-Sheet Input

Standard Ports

USB Compatible with USB 2.0 Specification (Type B), Ethernet 10/100BaseTX (RJ-45)

Size (in. - H x W x D)

8.7 x 14.5 x 14.3 in.

Weight (lb.)

20.6 lb.

Packaged Size

11.02 x 16.14 x 16.54 in. (in. – H x W x D)

Packaged Weight (lb.)

23.19 lb.

Print Speed

Up to: Black: 42 ppm (Letter)

Print Speed Duplex

Up to: Black: 18 spm (Letter)

Time to First Page

As fast as: Black: 5.9 seconds

Print Resolution

Black: 2400 IQ (2400 x 600 dpi), 600 x 600 dpi


2-sided: Integrated Duplex

Printable Area

0.2 inches of the top, bottom, right and left edges (within)

Media Types Supported

Paper Labels, Card Stock, Plain Paper, Envelopes, Refer to the Paper & Specialty Media Guide

Finishing Option


Number of Paper Inputs

Standard: 2, Maximum: 3

Paper Input Capacity

Standard: 350 pages 20 lb or 75 gsm bond, Maximum: 900 pages 20 lb or 75 gsm bond
350 pages 20 lb or 75 gsm bond

Paper Output Capacity

Up to:
Standard: 150 pages 20 lb or 75 gsm bond, Maximum: 150 pages 20 lb or 75 gsm bond

Paper Weight Range Supported

16 – 32 lb. (Standard Tray), 16 – 58 lb. (Multipurpose Feeder)

Optional Paper Handling

550-Sheet Lockable Tray, 550-Sheet Tray

Maximum Monthly Duty Cycle

Up to: 80000 pages per month

Laser Cartridge Yields

up to:
3,000-page Cartridge, 15,000-page High Yield Cartridge, 20,000-page Black Extra High Yield Cartridge

Imaging Unit Estimated Yield

Up to:
40000 pages, based on 3 average letter/A4-size pages per print job and ~ 5% coverage

Cartridge(s) Shipping with Product

3,000-page Return Program Toner Cartridge

Replacement Cartridges

Product functions only with replacement cartridges designed for use in a specific geographical region.

Processor Speed

Dual Core, 1.0 GHz


Standard: 256 MB, Maximum: 256 MB

Hard Disk

Not Available

Printer Languages

PCL 5c Emulation, PCL 5e Emulation, PCL 6 Emulation, PostScript 3 Emulation, Direct Image

Fonts and Symbol Sets

2 PCL bitmap fonts, OCR-A, OCR-B scalable PCL 5e fonts, For more information, refer to the Technical Reference., 89 scalable PostScript fonts, 3 of 9 scalable PCL 5e fonts in Narrow, Regular and Wide, 89 scalable PCL fonts

Touch Screen Display


Direct USB


Ethernet Network




Network Protocol Support

TCP/IP IPv6, IPSEC w/ IPv4, IPSEC w/ IPv6, TCP/IP IPv4, ICMP, TCP, IGMP, UDP, 802.1x

Network Printing Methods

LPR/LPD, Microsoft Web Services WSD, FTP, TFTP, Enhanced IP (Port 9400), IPP 1.0, 1.1, 2.0 (Internet Printing Protocol)

Network Management Protocols


Network Security

SNMPv3, 802.1x Authentication: MD5, MSCHAPv2, LEAP, PEAP, TLS, TTLS


1-Year Advanced Exchange, Next Business Day


In the box

Software and documentation CD
Up to 40,000 pages** return program imaging unit
Up to 3,000 pages* return program toner cartridge
Lexmark MS431dw laser printer
Stability sheet and safety sheet or booklet
Statement of limited warranty/guarantee
Power cord(s)
Setup guide or sheet (network and local attachment)