
Enhanced performance, ease of use and security features make the 
B721dn/B731dn perfect for productivity-minded companies.
Highlights:
• B731dn print speed up to 55 ppm; 
B721dn up to 49 ppm
• First page prints in as little as 5 seconds
•  Duplex (2-sided) printing standard
• Standard high-speed USB and 1 Gigabit 
Ethernet connectivity 
• 256 MB RAM standard, upgrades to 768 MB
• Powerful 800 MHz processor
• 630-sheet standard paper input expands to 
3,160 sheets with options
• 100-sheet multi-purpose tray
 Easy-to-read backlit control panel with 
•
easy-to-use alphanumeric keypad
• USB host port for walk-up printing
• Rock-solid performance: B731dn monthly 
duty cycle up to 280,000 pages; B721dn up to 
250,000 pages
• High-quality 1200 x 1200 dpi resolution 
for crisp, clear output
• Fewer interventions, single-piece print 
cartridge up to 36,000-page capacity
• Options include 2nd, 3rd and 4th 530-sheet 
paper trays, 2,000-sheet Large Capacity 
Feeder, and 160 GB hard disk drive
• 1-Year On-Site warranty 
• Live, toll-free technical support 24/7/365
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The B721dn and B731dn printers from OKI are 
designed to enhance productivity in demanding 
environments. 
These digital monochrome printers 
can deliver powerful, cost-effective performance, 
providing crisp, clear documents with high speed 
and low levels of user inter vention. They’re a 
powerful, reliable solution for your workgroup 
printing needs.
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Feature-rich and up to any task – Perfect for 
high-volume applications, both printers have 
high monthly duty cycles. If your business 
requires lengthy proposals, reports, memos, 
spreadsheets, schedules, you name it—day after 
day after day—these are the printers for the job. 
They’re not just reliable, they’re also fast: the 
B731dn prints at up to 55 ppm and the B721dn 
at up to 49 ppm, with the first page appearing in 
as little as 5 seconds.
1
 Users will spend less time 
waiting for their documents—which print at a 
crisp and clear 1200 x 1200 dpi resolution.
With standard duplex printing you can double 
your efficiency (and save resources) by printing 
on both sides of the sheet. And with the straightthrough paper path, you can manually feed 
sheets of up to 140 lb. (253 gsm) index bristol  
or up to 80 #10 envelopes from the standard 
paper tray.
LCD display and alphanumeric keypad – These 
printers are extremely user friendly. A 5-line, 
blue backlit graphical display and alphanumeric 
keypad make menu settings and navigation a 
snap. Messages on the display are easy to read. 
Administrators can use the printer’s keypad to 
control user access, and end users can enter 
PIN numbers to release secure print jobs. 
Print from a USB Flash drive – Simply insert 
a USB memory stick into the USB port 
conveniently located on the side of the printer. 
Print select file formats without the need for 
a PC. Just follow the directions on the LCD 
display, and you’re on your way in seconds.
At home in your environment – B721dn and 
B731dn printers are compatible with current 
Windows
®
 and Mac® operating systems, and all 
are equipped with high-speed USB and 1 Gigabit 
Ethernet connectivity, so that everyone can take 
advantage of the productivity and cost savings.
1
 Published per formance results based on laboratory testing of 
print sp eed on letter-size shee ts. Individua l result s may vary.
2
 Memor y DIMM sold separately.
3
 B731dn only. Both models available with 18,00 0-page and 
25,000 -page toner ca rtridges . Declared yield in accord ance with 
ISO/IEC 19752.
4
 Available in the U.S. and Ca nada only.

Keeping up with your needs—and environmental concerns. 
The B721dn and B731dn fit the way you work—
today and, through an array of performanceenhancing options and upgrades, they can adapt 
to match your future printing needs.
Both models come with 256 MB of memory and 
630-sheet paper capacity. You can increase 
memory to 768 MB
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 for processing large files 
and add a 160 GB hard disk drive for file storage.
You can boost the paper capacity to a maximum 
of 3,160 sheets. Options include up to three  
additional 530-sheet paper trays or a 2,000sheet Large Capacity Feeder. 
Also for fewer interventions, both models are 
available with 18,000-page and high-capacity 
25,000-page one-piece printer cartridges— 
and the B731dn is available with an extra-high 
capacity 36,000-page printer cartridge, as well.
These printers can also help control your impact 
on the environment
printers offer a number of environmentally 
friendly features, including: 
• ENERGY STAR
power consumption, these printers meet the 
government’s standards for energy efficiency. 
• Duplex (2-sided) printing – This technology 
allows for savings in energy and resources,  
in addition to using less media.
• One-piece consumables – Long-lasting, 
user-replaceable printer cartridges remain 
friendly to your budget while lowering the 
number of items to dispose of or store. 
• Low power consumption – These finely 
engineered printers perform with low power 
requirements during regular operation, 
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especially in Deep sleep mode.
THE B721dn/B731dn Digital Mono Printers AT A GLANCE:
B721dn
 – B721dn and B731dn 
®
 compliance – With their lower 
Backed by legendary service and support – 
OKI is so confident in the performance of the 
B721dn and B731dn printers that they come with 
a 1-Year On-Site warranty that can be increased 
up to 5 years with options.
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And, for live technical support 24/7/365, you can 
call, toll-free, 800.OKI.DATA (800.654.3282) and  
speak to an expert located in North America.
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The B721dn and B731dn printers from OKI: 
full-featured and energy-efficient monochrome 
printers that can enhance the performance of 
your demanding small- to mid-size workgroups.
1
 Memor y DIMM sold separately.
2
 Declared yield in accordance with ISO/IEC 19752.
3
 Available in the U.S. and Ca nada only.
4
 Published per formance results based on laboratory 
testing of simple x (1-sided ) print speed. Individual 
result s may vary.
B731dn
Up to 49 ppm print speed
Duplex (2-sided) printing standard
1200 x 1200 dpi resolution
High-speed USB and 
1 Gigabit Internet connectivity
Backlit graphical display, alphanumeric keypad
100-sheet multi-purpose feeder
Convenient USB 2.0 port (applies to both models)
530-sheet standard paper tray
Optional 530-sheet 2nd paper tray
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Up to 55 ppm print speed
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Optional 2nd, 3rd and 4th tray 
configurations apply to both models
Optional 530-sheet 
3rd paper tray
Optional 530-sheet 
4th paper tray
Optional caster base
Optional 2,000-sheet 
paper feeder
Optional 2nd tray and 2,000-sheet feeder 
configuration applies to both models

B721dn/B731dn
Specifications
Performance
•
Simplex Print Speed: B721dn – up to 49 ppm; 
B731dn – up to 55 ppm 
•Duplex Print Speed: B721dn – up to 40 ipm; 
B731dn – up to 42 ipm 
•Time to First Page: As fast as 5 seconds 
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•Processor: 800 MHz CPU
•Print Resolution: 1200 x 1200 dpi
•Monthly Duty Cycle: B721dn – up to 250,000 pg.; 
B731dn – up to 280,000 pg.
•Recommended Monthly Print Volume: 
B721dn – 3,000 - 20,000 pg.;  
B731dn – 5,000 - 30,000 pg. 
Compatibility
•
Emulations: PCL® 5e, PCL 6; PostScript® 3™;  
PDF v1.8; XPS; IBM® ProPrinter®; Epson® FX 
•Operating Systems: Microsoft
®
 Windows® 8, 
Windows 7, Windows Vista®, Windows XP,  
Windows Server 2012, Server 2008 R2,  
Server 2008, Server 2003; Mac OS® X 10.4 to 10.8
Connectivity
•
Interfaces: Standard – High-Speed USB, USB Host, 
1 Gigabit Ethernet (10/100/1000 Base-TX); models 
with Wireless or Parallel interface available by 
special order
Operator Panel
•
Operator Panel: Alphanumeric keypad; 5-line,  
blue back-lit graphical display
Memory
•
Standard RAM: 256 MB
•Max RAM: 76 8 MB
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•Memory Storage: Optional 160 GB Hard Disk Drive
Paper Handling
•
Duplex: Standard
•Standard Paper Capacity: 630 sheets (530-sheet 
Main Tray + 100-sheet Multi-purpose Tray)
•Additional Paper Capacity: Optional 530-sheet 
2nd, 3rd and 4th Trays; 2,000-sheet L arge 
Capacity Feeder
•Maximum Paper Capacity: 3,160 sheets  
(standard 630 -sheet input + 530-sheet 2nd Tray + 
2,000-sheet Large Capacity Feeder)
•Paper Types: Letter, Legal 13/13.5/14, Executive, 
A4, A5, B5; Com 10 envelopes 
•Paper Size: 3" x 5" min. to 8.5" x 14" and 
banners up to 52" long
•Auto Size Detect: Trays 1, 2, 3, 4 – Letter/Legal/ 
Exec utive/A4/A5/B5/COM 10
•Standard Paper Output: 500 sheets face-down; 
100 sheets face-up
•Paper Weight: 17 lb. bond – 140 lb. index bristol 
(64 – 253 gsm)
Resident Fonts
•
Scalable Fonts: 90 PCL fonts; 136 PostScript fonts.
•Barcodes: UPC-A, UPC-E, EAN/JAN-8, EAN/JAN-13, 
Interleaved 2of5, Code39, Code128, EAN/ 
UCC-128, CODABAR, ZIP+4 POST NET, PDF417,  
2D QR Barcode
Environmental
•
Size (WxDxH): 17.1" x 19.6" x 16.1"  
(435 mm x 498 mm x 410 mm)
•Weight: 59.5 lb (27 Kg)
•Power Consumption: Deep sleep – 1.5W (3.9W 
with installed options); Power-Save – 17W; 
Standby – 95W; Average – 800W (49 ppm),  
850W (55 ppm); Peak – 1,400W 
•ENERGY STAR
®
 Compliance: Yes
•ENERGY STAR TEC Value: 4.04 kWh/w (49 ppm); 
5.0 kWh/w (55 ppm)
•Acoustic Noise: Operating: B731dn – 57dBA 
or less; B721dn – 55dBA or less;Quiet mode – 
53dBA or less; Standby – 30dBA or less
Supplies
•
Print Cartridges: Standard – 18,000 pages;  
High-Capacit y – 25,000 pages; Extra-High 
Capacit y (B731dn only) –36,000 pages
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Warranty
Printer: 1-Year limited On-Site warranty4 
•
•LED Printhead: 5-Year limited warranty
1
 Published per formance results based on laboratory testing of 
print sp eed on letter-size shee ts. Individua l result s may vary.
2
 Memor y DIMM sold separately.
3
 Declared yield in accord ance with ISO/IEC 19752. Bo th models 
ship with 10,000-page “s tarter” toner cartridge .
4
 Available in the U.S. and C anada only.
Ordering Information
Descr iption    Part N umbers
B721dn (120V)    62442001 
B731dn (120V)    62442101 
Wireless model and Parallel I/F model  
available by special order
Options
2nd/3rd/4th 530-Sheet Paper Tray    45478901 
Caster Base Stand    45478701 
2,000-Sheet Large Capacit y Feeder    45530101 
512 MB DIMM Memory E xpansion    70061901 
160 GB Hard Disk Drive    44622305
OKIcare® Warranty Extensio ns 
2-Year On-Site Warranty  380346 02 38034612 
3-Year On-Site Warranty  380346 03 38034613
Supplies
Print Cartridges
Standard Print Cartridge (all models):  
Average life – 18,0 00 pg. 
High-Capacity Print Cartridge (all models):  
Average life – 25,000 pg. 
Ext ra-High Capacity Print C artridge (B731dn): 
Average life – 36,000 pg.
Print Media  Sheets Per Box
Bright White Proofing  
Sheet s (32 lb.; 8.5" x 11")  500  52206101 
SynFlex™ Paper (Waterproof  
and Tear-resistant; 8.5" x 11" )  100  52205901 
Premium Envelopes (size #10):  100   52206301 
Premium Envelopes (size #10):  500  52206302
For more information on Digital Monochrome 
Printers and supplies from OKI, including OKIcare 
Extended Service Programs: 1.800.OKI.DATA 
(800.654.3282).
Specifications are subject to change without notice.
Featu red product s may not be available in all co untries.  
Pleas e contact your l ocal office fo r regional ava ilability.
© 2013 Oki Da ta Americas, Inc. O KI, OKIcare Reg. T.M. ,  
Oki Ele ctric Indus try Co., Ltd . On-Site logo, 7-D ay/24-Hour log o, 
SynF lex T.M., Oki Data Ame ricas, Inc. W indows, Vis ta, Reg. T.M. , 
Micros oft Corp. PC L Reg. T.M., Hew lett-Pac kard Co. PostS cript 
Reg. T.M ., PostScri pt 3 T.M., Adobe Systems , Inc. I BM, ProPri nter 
Reg. T.M ., IBM Inc. Epso n Reg. T.M., Seik o Epson Corp. Mac  
Reg. T.M ., Apple, Inc. USB-I F logo T.M., U niversal Ser ial Bus 
Implem enters Forum , Inc. ENERGY S TAR Reg. T.M., U.S. EPA
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U.S. Canada
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    45488801
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    454 88901
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    45439001
®
Oki Data Americas, Inc.
USA
2000 Bishops Gate Blvd. 
Mount Laurel , NJ 08054- 4620 
Tel: 800.OK I.DATA (800.654.3282) 
Fax: 856 .222.5320
Canada
4140B Sl adeview Cr escent 
Unit s 7 & 8 
Mississaug a, Ontario L5L 6A1 
Tel: 905.608.5000 
Fax: 905.608.5040
ww w.okidata.com
Printed in the USA   
MS 160 74- 0513
Latin America 
2000 Bishops Gate Blvd. 
Mount Laurel , NJ 08054- 4620 
Tel: 856.231.0002 
Fax: 856.222.5071
Oki Data d e México, S. A. de C .V. 
Mar iano Escobedo, 748 8 º Piso 
Col. Nueva Anzur es C.P. 11590 
Méx ico, D.F. 
Tel: 55 .5263.878 0 
Fax: 55.5250.3501
Oki Data d o Bra sil Informátic a Ltda. 
Av. Alfred o Egídio de Souza Ar anha, 100 
Bloco C – 4 º andar 
04726 -170 – São Paul o – SP – Brasi l 
Tel: 11.3444.3500  
Fax: 11.3444.3502