Mid-State Litho stocks genuine OEM supplies for OKI production printers. The line includes toner cartridges, image drums, fuser kits, transfer belts, waste toner boxes, paper trays and feed rollers. Most items here fit the OKI C931, C941 and C942 series. Print shops run these wide-format production machines for envelopes, tabs and short-run color work.
The list includes specialty consumables that are hard to find elsewhere. Examples are C942 white toner for printing on dark and colored stock and the C941 clear drum. The envelope fuser kit prevents wrinkles on envelope jobs.
We also carry supplies for older OKI machines. These include CX3641 MFP toner and 900DP/511 series toner and transfer belts. We also stock the pickup, feed and retard rollers, which wear out long before the printer does. OKI wound down its own printer distribution, but the supply line continues. We source current genuine OKI consumables through the authorized IntoPrint program.
Mid-State Litho supplies Michigan and Great Lakes print shops. We started in 1984. Every item ships with a real part-number match. If you are not sure which toner or drum your model takes, call 1-800-343-4231. We will match it before you order.
Everything on this page is genuine OKI OEM stock. Mid-State Litho does not sell remanufactured or compatible OKI cartridges. A remanufactured cartridge can leak or under-fill on a C941 or C942 that runs production work. A single service call then costs more than the cartridge saved.
OKI C931, C941 and C942 Toner and Drums
OKI C931, C941 and C942 production printers share most of their consumable set. Black toner has a 38,000-page yield (SUP-637, $173). Cyan and magenta are 38,000-page cartridges (SUP-638 and SUP-639, $328 each). The C941 and C931 yellow is a 38,000-page cartridge (SUP-640, $328). The C942 yellow is a 24,000-page cartridge (SUP-641, $208). The C942 also takes a 15,000-page white toner at 5 percent coverage (SUP-643, $580).
Image drums are separate from toner: black (SUP-645, $365), cyan, magenta and yellow (SUP-646, SUP-647 and SUP-648, $607), the C942 white drum (SUP-650, $532) and the C941 clear drum (SUP-651). Shops buy these presses for the white and clear consumables, which give spot white and clear on dark and colored stock. Few resellers stock the matching drums.
Fusers, Transfer Belts and Maintenance Parts
Keep an OKI production printer in service with the wear parts that outlast a single toner cycle. We stock the 120V fuser kit (SUP-652, $526), the transfer belt (SUP-654, $398) and the waste toner box (SUP-655, $28). The envelope fuser kit (SUP-653, $526) prevents wrinkles when envelope stock goes through the fuser. For paper handling we carry the high-capacity 3-in-1 tray (PRT-2633, $1,593) plus the pickup, feed and retard roller assemblies that wear out first ($18 to $62). If you run color inkjet envelope printers for the same envelope work, those consumables sit on the same shelf.
Supplies for Older OKI Printers
We still support OKI machines the brand no longer markets. That includes CX3641 MFP cyan and yellow toner ($119 each) and the 900DP/511 series: yellow toner ($335) and the transfer belt ($279). Running mixed brands in the shop? We also stock Konica Minolta press supplies, digital printing supplies and laminating film alongside these OKI parts.
How to Match OKI Toner and Drums to Your Printer
OKI C9xx part numbers trip up buyers because some consumables cross models and some do not. Start with three checks.
First, read the exact model off the printer's front panel before you order. The 38,000-page black toner (SUP-637) fits the C931, C941 and C942. Yellow is model-specific: the C941 and C931 take the 38,000-page SUP-640, and the C942 takes the 24,000-page SUP-641. White toner differs too, a 10,000-page cartridge on the C941 and a 15,000-page cartridge on the C942.
Second, know the difference between toner, drum and fuser. Toner is the consumable you replace most often. Image drums are separate parts that last several toner cycles and get replaced on print-defect symptoms. The fuser and transfer belt are replaced on page count or on wrinkle and registration symptoms.
Third, standard versus specialty. The white and clear consumables need the matching install position and drum. Order the drum with the toner when you move into spot white or clear work. Still not sure? Call 1-800-343-4231 for same-day quote turnaround and we will match the part to your model before you order.
Why Buy OKI Supplies from Mid-State Litho
Mid-State Litho became a Michigan dealer in June 1984. That is 42 years of supply to print and bindery shops across the Great Lakes. We stock genuine OEM OKI consumables from the authorized OKI Data and IntoPrint dealer program. Our factory-trained technicians work on the presses that these supplies feed.
Every order ships with a real part-number match and same-day quote turnaround. Financing and leasing is available on equipment purchases. Order by phone and we will confirm the toner, drum or fuser that your model takes before it leaves the shelf. Call 1-800-343-4231, reach our service and support team, or contact us with your model and serial number. We also handle digital presses and inkjet printers and binding and pressroom supplies, so the press, the supplies and the technician come from one dealer.
OKI Supplies FAQ
Are these genuine OKI toner cartridges or remanufactured?
All genuine OEM, sourced through the authorized OKI dealer program. On production presses, OEM toner protects color consistency and equipment warranty, where remanufactured cartridges put both at risk.
Which toner fits the OKI C941 vs C942?
The 38,000-page black toner (SUP-637) fits the C931, C941 and C942. Yellow differs by model: SUP-640 for the C941 and C931, SUP-641 for the C942. White toner is model-specific too, a 10,000-page cartridge on the C941 and a 15,000-page cartridge on the C942.
Do OKI printers use ink or toner?
The C9xx and Pro series are LED toner devices. Mid-State Litho stocks OKI toner, drums and fusers, not inkjet cartridges.
Can I still get supplies and parts for discontinued OKI printers?
Yes. Supply production continues under the authorized program. We stock current C9xx consumables plus CX3641 and 900DP/511 items and wear parts like feed and retard rollers.
When do I replace the image drum instead of the toner?
Replace the drum on repeating print defects or faded bands that persist after a fresh cartridge. Drums last several toner cycles, so you change toner far more often than drums.