
ML5720eco/ML5721eco Specifications
Powerful 9-pin dot matrix printers with  
advanced paper handling
Fast, reliable, printing  
for demanding work environments
The ML5720eco and wide carriage ML5721eco 
are designed where fast printing, reliability 
and exible paper handling is essential. With 
the ability to manage thick forms and heavy 
works, these dot matrix printers are perfect for 
demanding environments such as production, 
vehicle repair/service centres, warehouses, 
laboratories, wholesalers and freight forwarders. 
Whether you are printing invoices, picking lists, 
call log slips, tickets, receipts, forms or multi-part 
documents, the ML5720eco/ML5721eco keeps 
your transactions smooth and your customers 
happy. And, thanks to the ML5720eco’s small 
footprint it is ideal for businesses where space is 
limited, for example, at the front desk of banks, 
travel agents, stations or surgeries. 
Flexible, Eco-friendly and cost eective
The ML5720eco/5721eco have been developed 
with eco-friendly technology. With power 
consumption of just 1.5w in Sleep mode, your 
running costs and energy consumption are kept 
to a minimum, as well as reducing your carbon 
footprint.
More paper paths give you exibility. The three 
tractor feeding paths handle multi-part forms 
and continuous paper from either the front, rear 
or bottom. The two friction feeding paths handle 
cut-sheets, cards and envelopes from either the 
front or top.
A selection of pull and push tractors allow 
permanent stationary loading, for use on demand 
and handle multi-part and continuous forms 
more eciently. The optional Roll Paper Stand 
(ML5720eco only) is a cost eective option for 
applications with variable paper lengths.
OKI’s commitment to our customers
The OKI brand is one of proven reliability and 
value. We provide printers that increase our 
customers’ long-term business performance 
without impacting their budget. 
With almost half a century of experience in 
the impact printer industry, with OKI you are 
guaranteed a best-in-class, low cost, reliable and 
easy to use printer. 
Key Benets: 
Faster transactions
 Races through up to 7-part forms and lists  
 at print speeds of up to 700 characters  
 per second for faster transactions
Tough and reliable
 Operates in the most challenging  
 environments
 Mean Time Between Failure (MTBF) gure  
 of 25,000 hours
Easy to install and use
 On-board Microline, Epson and IBM 
 compatibility for trouble free plug and print
 Simple ‘Clean hands’ ribbon changing  
 ensures no delay, mess or hassle when tting  
 a new ribbon
Save money
 Long life ribbon (8 million characters  
 ML5720eco, 13 million characters ML5721eco)
 Low energy consumption in Sleep mode
 Low cost per page
Flexible paper handling
 Four paper paths can handle forms, cut-sheet  
 and continuous sheets
Environmentally Friendly
 Eco-friendly technology, sleep mode  
 consumes just 1.5W
 Manufactured at a carbonzero rated facility
Variants available:  
ML5720eco
Narrow carriage
ML5721eco
Wide carriage

ML5720eco/ML5721eco - Dot Matrix Printers
Printer
Number of pins
Character pitch
Print speed
9
ML5720eco: 80(10cpi); 160 (maximum in compression mode)
Columns
ML5721eco:  136(10cpi); 272 (maximum in compression mode)
5/6/7.5/8.5/10/12/15/17.1/20 pitch and proportional
Super Speed Draft:  700cps (12cpi); High Speed Draft:  600cps 
(10/12/15/17.1/20cpi); Draft: 450cps (10/12/15/20cpi); 
Draft: 431cps (17.1cpi); Near Letter Quality:  113cps 
(10/12/15cpi); Near Letter Quality:  up to 108cps (17.1/20cpi)
Interface and Software
Interfaces
Optional interfaces
Emulations
Typeface & font
Typestyle
Barcode fonts
Printer driver
Paper Handling
Continuous paper (width)ML5720eco: 76.2 - 254.0mm;  ML5721eco: 76.2 - 406.4mm
Continuous paper (length)
First printable line
(from top of page)
Copy capability
Multi-part paper thickness
Paper feeding
Optional paper feeding
IEEE 1824 parallel interface, USB 2.0 (full speed)
Ethernet 10/100, Serial RS232C
Epson FX ESC/P, IBM PPR, ML
SSD, HSD, Draft, Courier (scalable), Gothic (scalable), OCR-B
Emphasised, Enhanced, Double Width, Double Height, Italics, 
Superscript, Subscript, Underline, Overscore
UPC-A, UPC-E, EAN8, EAN13, Code39, Interleaved 2of5, 
Code128(A/B/C), CODABAR (NW-7), POSTNET, Industrial 2of5, 
Matrix 2of5
Windows 2000 / XP (32-bit & 64-bit) / Vista (32-bit & 64-bit) / 7 
1
(32-bit & 64-bit) / Server 2003 (32-bit & 64-bit) / 
Server 2008 (32-bit & 64-bit) / Server 2008 R2 (64-bit)
Status monitor, Button setup utility, Menu setup utility, TOF 
Utilities
setup utility, Network setup utility, LPR utility
Cut Sheet (single sheet), Continuous Paper (single-part,  
multi-part), Roll paper(ML5720eco only), Envelope, Card, 
Paper
Label (cut sheet and fan fold)
76.2 - 558.8mm
Continuous: 2.12mm; Cut sheet: 0.5mm
Up to 1 original + 6 copies 
Front/rear push feed: 0.36mm; Front/rear pull feed & front/rear 
push-pull feed: 0.44mm; Bottom pull feed: 0.48mm
Manual insertion: Front or rear in, top out; Push Tractor: Front or 
rear in, top out; Pull tractor: Front or rear or bottom in, top out
Single Bin Cut Sheet Feeder, Push Tractor (front/rear feeds), Pull 
Tractor (bottom feed), Roll Paper Stand (ML5720eco only)
General Features
Input buer
Power supply
Power consumption
Noise levelNormal: 57dB(A); Quiet: 55dB(A); Silent mode: 52dB(A)
Dimensions (HxWxD)
Print Head life
Reliability
Warranty
Product order numbersML5720eco: 01268401;  ML5721eco: 01268501
Accessories (Order Numbers)
Single Bin Cut Sheet Feeder ML5720eco:  44497402; ML5721eco:  44497502
Pull Tractor (bottom feed) ML5720eco: 44753902;  ML5721eco: 44754002
Consumables (Order Numbers)
Push Tractor 
(front/rear feeds)
Roll Paper Stand
Serial RS232C
Ethernet 10/100
(8 million characters)
(13 million characters)
128Kbytes
Single phase 220 to 240VAC, +/- 10%
ISO/IEC 10561 Letter, Draft, Range1: 52W; 
Sleep mode:1.5W (with no optional attachments)
ML5720eco: 191 x 438 x 375mm;   
ML5721eco: 191 x 592 x 375mm
Weight ML5720eco: 7.5kg approx;  ML5721eco: 10kg approx
400 million characters
MTBF: 25,000 hours
Pan European 1 year on-site
ML5720eco: 44454902;  ML5721eco: 44455002
09002332 (ML5720eco)
44455102
44455302
Ribbon
44173405 (ML5720eco)
Ribbon
44173406 (ML5721eco)
1
Check local OKI Printing Solutions website for latest driver releases and OS compatibility
Consumables Information: Only use genuine OKI Printing Solutions Original consumables to ensure the best quality and performance from your hardware. Non OKI Printing Solutions Original 
products may damage your printer’s performance and invalidate your warranty.
OKI Systems (Poland) Ltd
ul. Domaniewska 42
02-672 Warsaw
Poland
Tel: +48 22 448 65 00
Fax: +48 22 448 65 01 
WARNING! This product complies with EN55022 Class B. However when fitted with the optional network interface card or optional cut sheet feeder, 
compliance to EN55022 is Class A. In a domestic environment this configuration may cause radio interference, in which case the user may be 
required to take adequate control measures.
www.oki.com.pl
© 2011 Oki Europe Ltd. Oki Printing Solutions is the trading name of Oki Europe Ltd. Version 1.1 01/2011. 
Specification subject to change without notice. All trademarks acknowledged.