Used Ruf 18,5/5000/80 for sale (19,687)

Condition: used, Year of construction: 2017, operating hours: 900 h, functionality: fully functional, machine/vehicle number: 2575, Model/Type: RUF 18.5/5000/80 Iedpst Sfxmsfx Aaxstk Machine No.: 2575 Year of Construction: 2017 Drive Motor: 18.5 kW Throughput Capacity up to max.: 550 kg/h (depending on material) Pressing Pressure: approx. 5000 kg/cm² Briquette Format: 80 mm Running Hours: approx. 900 h Warranty: 12 months after delivery Availability: approx. 8 weeks after receipt of down payment Details: + Siemens TP 700, Siemens S7-1200 + 600 x 1,000 mm hopper + Electrical emulsion pump + Spraying device + Extractable screw + Speed-controlled pump

Condition: excellent (used), Year of construction: 2021, operating hours: 10,200 h, functionality: fully functional, machine/vehicle number: 3284, Standard version of RUF Lignum R2 with outfeed channels, el.motor 22 kW, briquette sizes 150x60 mm Iedjyyl Srjpfx Aaxotk capacity up 500 kg/h

Condition: used, Year of construction: 1970, call (contact · telephone · mobile · WhatsApp) Itjdpfx Aemf Uh Hjaxek * Ruf ALU 1000 * 3 tank containers * 980 L per tank container (total: 2910 L) * Underfilling * 230 kg tare weight per tank * Suitable for transport of diesel, petrol, oil, etc. * Manufacturer number: 501316

Year of construction: 2018, condition: excellent (used), functionality: fully functional, We are offering a high-productivity 3D printer designed for industrial serial production. The system was last used with AlSi10Mg aluminum powder. The 3D printer has already been dismantled by the manufacturer. Dismantling and functional reports are available, confirming the machine was operational prior to dismantling. All axes have been professionally secured for transport. The machine can be transported on a standard truck. TruPrint 5000 G4 Serial number S0731C0008 Year of manufacture: 08/2018 Laser operating time Laser 1 "Beam on" time: 5,165 hrs Laser 2 "Beam on" time: 5,096 hrs Laser 3 "Beam on" time: 5,023 hrs Trumpf TruPrint 5000 including Powder Bed Monitoring and Melt Pool Monitoring options Filter system Accessories: 2x Build cylinders 3x Dosing cylinders 1x Overflow container (used) 1x Overflow container (NEW) Manuals 4x Heat exchangers (NEW) 2x Easy Filters (NEW) 3x NTRON SIL02 Oxygen Analyzer + Sensor (NEW) 1x Oxygen sensor (NEW) ...and much more, such as seals, etc. An Armanni CAR.Elev. pallet truck for changing containers is also in stock and can be offered as an optional extra. Get high-quality 3D components faster The TruPrint 5000—a high-productivity, semi-automated 3D printing system—prepares you for industrial serial production. With features such as optional 500°C preheating and a full-field multilaser configuration utilizing three 500-watt TRUMPF fiber lasers, you are ideally equipped for highly demanding industrial applications. The machine manufactures high-quality components from various metallic materials quickly and reliably, meeting the rigorous quality standards of tool and mold making—including via 3D printing onto preform blanks—as well as those of the aerospace and medical technology sectors. Optionally, the entire process chain—sieving, printing, cooling, and depowdering—can take place in a protective gas atmosphere. Combined with TRUMPF’s external part and powder management systems and monitoring solutions, it is ideally suited for industrial additive serial production. Iedszpvdzjpfx Aaxotk Thanks to the preform option, the TruPrint 5000 supports hybrid component production. In this process, the additive component structures are built directly onto a blank. This innovative option is particularly well-suited for easy handling in tool and mold making. TruPrint 5000 Build volume (cylinder) mm x mm Ø 300 x H 400 Ø 290 x H 390 (Reduced if preheating >200 °C) Processable materials[1] Weldable metals in powder form, e.g., stainless steels, tool steels, aluminum, nickel-based, or titanium alloys Build rate[2] cm³/h 5 – 180 Layer thickness[3] μm 30 – 150 Max. laser power at workpiece (TRUMPF fiber laser) W 3 x 500 Beam diameter[3] μm 100 – 500 Min. measurable oxygen content ppm Up to

Condition: used, Year of construction: 2022, operating hours: 1,063 h, functionality: fully functional, machine/vehicle number: 11973, Model/Type: RUF 11/2800/60 Machine No.: 11973 Year of construction: 2022 Drive motor: 11 kW Throughput capacity up to max.: 150 kg/h (depending on material) Pressing force: 2800 kg/cm² Briquette format: ⌀60mm Itedpfx Asygrt Ieaxek Operating hours: approx. 1063 h Warranty: 12 months after delivery Availability: approx. 4 - 8 weeks after receipt of down payment Details: + Siemens TP 700, Siemens S7-1200 + 600 x 1500 mm hopper with extension + Pneumatic emulsion pump

Condition: used, Packaging line with Transnova-RUF Pick-&-Place, Garvens, Safeline, Mengozzi For sale is a complete packaging and inspection line from industrial use. Main components: - Pick-&-Place packer: Transnova-RUF including infeed and carton handling - Checkweigher: Garvens - Metal detector: Safeline (Mettler Toledo) - Infeed / singulation system: Mengozzi - Pusher / rejection unit - Conveyor technology and line connections Description: The system was used for automated: - Product infeed and singulation - Weight inspection - Metal detection - Rejection of faulty products - Pick-&-Place packaging into cartons / trays Suitable for applications in the food or FMCG industry. Condition: - Used complete line - System out of operation Isdey Exbdopfx Aaxotk - Functionality not tested - Completeness not guaranteed - Sale as-is / as inspected Terms of sale: - Preferably sold as a complete unit - EXW (ex works), self-collection - Company sale – without warranty, guarantee or return

Condition: excellent (used), Year of construction: 2001, Injection moulding machine: Krauss Maffei KM 800-5000 MC Year of manufacture: 2001 Operating hours: 70,000 h Configuration: Machine with robot, safety cage and conveyor belt Availability: Two identical machines available Clamping unit: Clamping force: 8,000 kN Maximum mould opening force: 356 kN Moving platen opening force: 98 kN Moving platen closing force: 92 kN Mould platen dimensions (H x W): 1,610 mm x 1,530 mm Distance between tie bars (H x W): 1,120 mm x 1,000 mm Mould opening stroke: 1,400 mm Minimum mould height: 600 mm Maximum mould opening: 2,000 mm Hydraulic ejector stroke: 250 mm Injection unit: Screw diameter: 90 mm L/D ratio: 23 Ijdpfxexqh I Ij Aaxjtk Injection pressure: 1,742 bar Injection volume: 2,863 cm³ Shot weight (PS): 2,605 g Dimensions and weight: Machine dimensions (LxWxH): 10.5 x 2.86 x 2.89 m Weight: 43 tonnes

Condition: good (used), functionality: fully functional, load capacity: 500 kg, Welding turntable, L-manipulator, positioner, in excellent condition, includes additional clamping plate. Rotating and tilting (overhead), steplessly adjustable speed. Mechanical height adjustment from 800 mm to 1100 mm. Outreach 1000 mm. Overall height 1800 mm. Length 3000 mm. Width 1100 mm. Clamping plate diameter 1000 mm. Iedpfx Aajylkn Ijxjtk

Condition: excellent (used), Year of construction: 2009, Mobile coil trolley FORSTNER AG 5000 b2mf 1500 Isdpfx Aajmv Hv Ajxotk Maximum roll width 1500 mm Load capacity 5000 kg Inner diameter 360 - 630 mm Outer diameter 1100 mm With 4-arm spindle Double bearing decoiler with handbrake and steel wheels for movement

Condition: good (used), Technical specifications: Briquetting press in good condition Year of manufacture: 2007 Technically inspected in 06 / 2025 Itedpjwtdk Tsfx Aaxok Cylindrical briquette: 80 mm Throughput up to max. 150 kg/h *only approx. 3,949 operating hours - Hydraulic press: briquetting press with discharge chute - Hydraulic unit: 4 kW - Pressure: max. 300 bar - Transport dimensions: 1585/2140/H1940 mm - Weight: 1,370 kg Functional guarantee upon handover We are happy to arrange a free test run!

Condition: excellent (used), Year of construction: 2001, Krauss Maffei KM 800-5000 MC injection moulding machine Year of manufacture: 2001 Equipment: robot Itedpfx Ajzd Ta Neaxjk Technical details: Clamping force: 8,000 kN Maximum mould opening force: 356 kN Moving platen feed force (opening): 98 kN Moving platen force (closing): 92 kN Platen size (W × H): 1,610 × 1,530 mm Tie-bar spacing (W × H): 1,120 × 1,000 mm Mould opening stroke: 1,400 mm Minimum mould height: 600 mm Maximum daylight: 2,000 mm Hydraulic ejector stroke: 250 mm Screw diameter: 90 mm L/D ratio: 23 Injection pressure: 1,742 bar Injection volume: 2,863 cm³ Shot weight (PS): 2,605 g General machine data Dimensions (L × W × H): 10,500 × 2,860 × 2,890 mm Weight: 43,000 kg

Condition: excellent (used), Year of construction: 2001, Briquetting press for metal chips or granules only tested on a trial basis hardly used 20 operating hours 2000 kg/cm2 Itedefb T Huepfx Aaxjk

Condition: refurbished (used), Year of construction: 2000, functionality: fully functional, machine/vehicle number: 370, total width: 2,500 mm, total height: 4,000 mm, total length: 7,000 mm, overall weight: 14,000 kg, type of input current: three-phase, space requirement width: 2,500 mm, space requirement length: 7,000 mm, space requirement height: 4,000 mm, input voltage: 380 V, oil tank capacity: 200 l, pressure: 300 bar, operating pressure: 250 bar, power: 37.51 kW (51.00 HP), year of last overhaul: 2023, noise level: 80 dB, Equipment: cooling unit, emergency stop, *Selling mobile wood briquetting system. *Press: Ruf RB440, output > 2 tons/hour. *Briquet dimensions: L 150 x W 80 x H 80 - 110 mm *Press completely overhauled, with all supporting documentation. *Truck with valid TÜV (technical inspection) until Jan. 2026, ready for use, also suitable for use in environmental zones / green license plate / tax-free!!! Classified as a self-propelled working machine. Itsdjwhw Syepfx Aaxek *PE packaging bags for approximately 90 tons, included. *Hydraulic pump Linde > New. *Gearbox discharge > New. *Suction fan motor 7.5 kW > New. *Complete hydraulic oil change with oil filter 200L > New. *Many spare parts available due to business closure. *Truck: MAN 14.232, 335,937 km, built in 1990. *Truck with new, reinforced flatbed body!! Manufacturer: Suhr. *TÜV > New. *Tires, all 6 > New. *Brakes on front axle newly replaced. *Everything is sold with training provided. *If interested, please contact us by email.

Condition: like new (used), Year of construction: 2023, functionality: fully functional, Equipment: cooling unit, emergency stop, RUF - LIGNUM CLASSIC, year of manufacture 2023, for sale Almost unused, in perfect condition Briquetting rectangular-shaped briquettes 150 x 60 x 40 – 110 mm Motor power 30 kW Max. pressing force 1700 kg/cm² Weight approx. 3300 kg Output up to 480 briquettes/hour Including strapping band and heat-sealing strip for briquette packs Immediately available If interested, also available: hot-air packaging machine Ijdpfozt U Tvsx Aaxotk

Year of construction: 2008, condition: ready for operation (used), A CNC laser cutting system Trumpf including RotoLas and Liftmaster is available. Laser source: TruFlow 5000, laser type: CO2 laser, laser power: 5000W, travel X/Y/Z: 3000mm/1500mm/115mm, max. material thickness structural steel/stainless steel/aluminium: 25mm/25mm/15mm, positioning accuracy: +/-0.1mm, repeatability: +/-0.03mm, max. axis speed: 200m/min, max. simultaneous speed: 300m/min. Machine dimensions X/Y/Z: approx. 11100mm/4600mm/2400mm, weight: approx. 12000kg, operating hours: 55462h, laser hours: 24430h, beam hours: 12742h. Hours status as of 01/2026. Documentation available. On-site inspection is possible. Expected to be available from January 2027. Iedpfx Aox Tumxoaxetk

Condition: ready for operation (used), Year of construction: 2001, operating hours: 70,000 h, functionality: fully functional, clamping force: 8,000 kN, screw diameter: 90 mm, clearance between the columns: 1,000 mm, injection pressure: 1,742 bar, opening stroke: 2,000 mm, TECHNICAL DETAILS Clamping force: 8,000 kN Maximum mold opening force: 356 kN Feed force of the moving opening platen: 98 kN Force of the moving closing platen: 92 kN Platen size (H x W): 1,610 mm x 1,530 mm Tie bar spacing (H x W): 1,120 mm x 1,000 mm Mold opening stroke: 1,400 mm Minimum mold height: 600 mm Iodpfx Aaoxup Nnsxetk Maximum opening: 2,000 mm Hydraulic ejector stroke: 250 mm Screw diameter: 90 mm L/D ratio: 23 Injection pressure: 1,742 bar Injection volume: 2,863 cm³ Shot weight (PS): 2,605 g MACHINE DETAILS Dimensions & Weight Dimensions (L x W x H): 10,500 x 2,860 x 2,890 mm Weight: 43,000 kg Operating hours: 70,000 h

Condition: excellent (used), functionality: fully functional, Year of construction: 2019, Inclined conveyor belt, vertical lift conveyor, effective length 7000 mm, horizontal section 2000 mm, inclined section: 5000 mm. Itsdpfxszfwlxj Aaxjk Drive power 2.2 kW, belt inner width: 700 mm, belt width/effective width: 500 mm, min. discharge height approx. 3.0 m; max. discharge height approx. 3.4 m.

Condition: ready for operation (used), Year of construction: 1995, Available immediately ex location: CNC tool milling machine Deckel, type FP 5–80, year of manufacture 1995, CNC control Dialog 12, universal table 750 x 520 mm. Travels X/Y/Z: 800/550/500 mm. Drive power: 9 kW. Quill stroke: 80 mm. Electronic handwheel. Spindle speeds: 32–5000 rpm. Feeds: 0–6000 mm/min. Weight: 4.5 t. Price: EUR 2,750 plus VAT, ex location. Ijdjzukcpjpfx Aaxjtk

Condition: excellent (used), functionality: fully functional, We offer a highly productive 3D printer for industrial series production. The system was finally used with AISi10MG aluminum powder. The 3D printer has already been disassembled by the manufacturer. Disassembly and functional reports are available, proving that the machine was in operation prior to disassembly. All axes are properly secured. The machine can be transported on a standard truck. TruPrint 5000 G4 Serial number S0731C0008 Year of manufacture 08/2018 Laser runtime Laser 1 beam on: 5165 hours Laser 2 beam on: 5096 hours Laser 3 beam on: 5023 hours Trumpf TruPrint 5000 with the Powder Bed Monitoring and Melt Poll Monitoring options, including a filter system. Accessories: 2x build cylinders 3x Dosing cylinder 1 used overflow tank 1 new overflow tank Manuals 4 new heat exchangers 2 new Easy Filters 3 new NTRON SIL02 Oxygen Analyzers + Sensors 1 new oxygen sensor and much more, such as seals, etc. Itsdpfx Aevu Syysaxsk The Armanni CAR.Elev. pallet truck for changing the tanks is also in stock and can be offered as an option. Get high-quality 3D components faster The highly productive, semi-automated TruPrint 5000 3D printing system prepares you for industrial series production. With features such as an optional 500°C preheater and full-field multi-laser configuration with three 500-watt TRUMPF fiber lasers, you are ideally equipped for the most demanding industrial applications. The machine produces high-quality components from a variety of metallic materials quickly and reliably, meeting the high quality standards in tool and mold making, including 3D printing on preform blanks, in the aerospace and medical technology industries. Optionally, the entire process chain can take place in a protective gas atmosphere: screening, printing, cooling, and depowdering. Combined with external parts and powder management and monitoring solutions from TRUMPF, it is ideal for industrial additive series production. Thanks to the Preform option, the TruPrint 5000 supports hybrid component production. The component structures to be additively manufactured are applied to a blank. This innovative option is particularly well-suited for easy handling in tool and mold making. TruPrint 5000 Build volume (cylinder) mm x mm Ø 300 x H 400 Ø 290 x H 390 (Reduction if preheating >200 °C) Processable materials[1] Weldable metals in powder form, such as: stainless steels, tool steels, aluminum, nickel-based, or titanium alloys Build-up rate[2] cm³/h 5 - 180 Layer thickness[3] μm 30 - 150 Max. laser power at the workpiece (TRUMPF fiber laser) W 3 x 500 Beam diameter[3] μm 100 - 500 Min. measurable oxygen content ppm Up to

Condition: used, Year of construction: 2011, Duplo 5000pro Booklet maker. Year 2011 Count 3436444 1 pervious owner, who brought new direct from Duplo. Has been on a maintenance contract. I have a video in production. Machine ready to go in my warehouse, I can put on pallets for transport if needed. Machine sold ex works. The Duplo System 5000 Pro is an automated high-speed collating and bookletmaking system. Key specifications include maximum collating speeds up to 9,800–10,000 sets per hour, bookletmaking speeds up to 5,000–5,200 sets per hour, and support for up to 60 collating bins using DC-10/60 Pro suction towers Collator Specifications (DC-10/60 Pro Towers)Number of Bins: 10 bins per tower (connects up to 6 towers for a total of 60 bins).Feeding System: Advanced air-management suction sheet feeding with adjustable airflow on each shelf.Paper Size: Min: 120 x 148 mm, Max: 350 x 500 mm.Paper Weight Range: Supports 50 gsm to 300 gsm stock.Collating Speed: Up to 9,800 – 10,000 sheets/sets per hour.Bin Capacity: 65 mm shelf/bin capacity. Itedpfx Aaozq S N Ajxsk 5000pro Booklet Maker Maximum Sheet Size: 350 mm x 500 mm (Up to 356 mm x 508 mm with certain configurations).Minimum Sheet Size: 120 mm x 170 mm.Maximum Booklet Capacity: Up to 25 sheets of 80 gsm paper (creates a 100-page booklet).Maximum Stitching Thickness: 5 mm (approx. 50 sheets of padded stock)

Condition: excellent (used), Year of construction: 2001, functionality: fully functional, RUF Briquetting System RB 4/2500/60 with Mucki Lifting and Tilting Device – Year of Manufacture 2001 Manufacturer: RUF GmbH & Co. KG Type: RB 4/2500/60 Year of Manufacture: 03/2001 For sale is a high-quality hydraulic briquetting system from RUF for processing aluminum chips. The system is equipped with an automatic Mucki lifting and tilting device (Type MD-3, load capacity 500 kg) and enables largely automated operation. The press compacts loose aluminum chips into compact briquettes, thereby significantly reducing the material volume. At the same time, cooling lubricants can be recovered, and the revenues from recycling can be increased. Technical Data Manufacturer: RUF GmbH & Co. KG Type: RB 4/2500/60 Year of Manufacture: 03/2001 Operating Voltage: 400 V / 50 Hz Connected Load: 20 A Protection Class: IP54 Briquette Diameter: 60 mm Material: Aluminum Chips Itjdpfx Aezhgwvsaxok Hydraulic Briquetting Press with Automatic Pre-compaction Large Material Hopper Automatic Feeding PLC Control Mucki Lifting and Tilting Device Manufacturer: Dieterle Maschinenbau GmbH & Co. Type: MD-3 Year of Manufacture: 2001 Load Capacity: 500 kg Power: 2.2 kW Equipment Automatic Lifting and Tilting Device Material Hopper Safety Enclosure Hydraulic System Complete Control Panel Operating Manual and Documentation Available CE Version The system is in good overall condition and comes from ongoing production. Inspection is possible by appointment. Loading can be assisted upon agreement.

Condition: used, Year of construction: 2002, Trumpf TruPunch 5000 Large Format Travel range of the X-axis in punching mode: 3,050 mm Travel range of the Y-axis in punching mode: 1,550 mm Sheet thickness: max. 8 mm Workpiece weight: max. 200 kg Punching force: max. 220 kN Stroke rates Punching stroke rate at 1 mm: 1,350 min⁻¹ Marking stroke rate: 3,000 min⁻¹ Part removal Part size, part flap during punching: max. 500 x 500 mm Part size, fixed chute during punching with a moving table: max. 80 x 50 mm Isdpfozudwmsx Aaxstk Options: Multi-tool Threading tools Marking function Chip conveyor Vibration-damped installation

Condition: as good as new (ex-display), FRONIUS TPS 5000 ✅ Scope of delivery: ➤Fronius TPS 5000 power source (500A TRANS PULS SYNERGIC) ➤Fronius FK 4000 ➤Fronius VR 4000 wire feeder unit ➤Fronius intermediate hose package standard from 1.5m ➤Fronius trolley ➤Fronius hose package ➤Ground cable 3-4m ➤Pressure regulator Isdpfx Aewbknboaxjtk This device can weld almost all materials, including aluminum, steel, and V2A. It features touch wire programs and is also suitable for MIG brazing (Cusi), which is frequently used in the sheet metal industry. Additional options and applications: This TPS series can be easily connected to a robot. All you need is an interface and the appropriate hose package. We also offer the optional RCU 5000i control panel, which allows you to create and import characteristic curves to further expand the functions of the TPS device. ---- IMMEDIATELY AVAILABLE PROPER INVOICE A viewing is possible in Austria in Vienna, 1230! ✔ Insured shipping on a pallet is no problem! ✔ ✅Questions✅Questions✅Questions: ✅Questions✅Questions✅ Questions✅ ►►►What is the condition of the device? To explain, we buy like-new used devices, disassemble them, check everything, replace wear parts if necessary, and only then, after successful test welding, is the device released for sale. "All" devices are clean and have neither burn holes in the displays nor countless burn holes or dents scattered throughout the device! You are buying an item from us that is also worth seeing and doesn't look completely finished! ►►►Do we receive an invoice when we purchase from you? Yes, we provide a proper invoice. If you have a valid VAT ID, we can issue a net invoice if the requirements for intra-community delivery within the EU are met. ►►►What payment options are available? Advance payment or cash upon personal pickup ►►►Is insured shipping possible? Yes, we will be happy to send you the purchased set well packaged and insured on a Euro pallet. ►►►Is there a warranty? We sell the machines at one-third the original price and unfortunately do not have the flexibility to offer a warranty. You are welcome to test the devices on site and pay in cash. ►►►Why buy from us? We are experts in this Fronius welding machine series and always have 60-80 devices in stock – exclusively Fronius, no other manufacturers! We are experts in these devices and don't sell anything we don't know about.

Condition: good (used), Year of construction: 2004, functionality: fully functional, Offered from an insolvency sale is a fully functional panel saw. Altendorf WA 80 Iedpfxozhak As Aaxjtk Year of manufacture 2004 Tilts up to 45° with motorized adjustment Motorized height adjustment With scoring saw Max. saw blade diameter 400mm Max. cutting height with a 350mm blade = 98mm at 90° --- 75mm at 45° With motor brake (approx. 4.5 seconds to stop) Carriage length 3200mm Cutting width to the right of the saw blade 1350mm Speeds 3/4/5000 rpm 380 volts Weight 990kg Emergency stop button Duplex fence Wide and narrow blade guard + used saw blades as shown in the picture

Condition: excellent (used), Year of construction: 2015, operating hours: 2,400 h, functionality: fully functional, overall weight: 6,000 kg, input voltage: 400 V, oil tank capacity: 200 l, pressing force: 200 t, pressure: 300 bar, compressed air connection: 10 bar, power: 18.5 kW (25.15 HP), year of last overhaul: 2026, filling opening width: 3,000 mm, Equipment: emergency stop, Selling a fully automatic briquetting system with a packaging line. In automatic mode, the system produces wood briquettes in 10 kg packages without supervision. Before palletizing, the weight is checked. Packages that are underweight are sorted out and placed on a separate pallet. The palletizing robot serves 4 pallet stacking stations, each with a capacity of 96 packages. In the event of a malfunction, an alarm is sent via SMS. Both the briquette press and the palletizing robot have been used very little and are in very good condition. The machine can be inspected while in operation. Consisting of: - Hopper, 10 m³ - Briquetting press RUF 300 - Curved conveyor belt - Straight conveyor belt, 7 m - Stacking machine, fully automatic, special design, pneumatically operated, Siemens PLC with adjustment options and package counter - Insert for leaflets, Köra Packmat - Film packaging machine Affeldt, pneumatically operated - Shrink tunnel Affeldt - Accumulation conveyor belt, 4 m - Singulation conveyor belt, 1 m - Roller conveyor, 1 m with load cells for weight control, Siemens PLC - Palletizing robot KUKA KR 210 R3100 ultra, approx. 4000 operating hours - Gripper, pneumatically operated with clamping and ejector - Safety fence with roller gate Isdpfezdk Ukox Aaxotk