Used Cormak Stół Krzyżowy 225X175 Mm Kp202 for sale (71,386)

Condition: new, Year of construction: 2026, functionality: fully functional, Precise cross table with a screw guard, dovetail-shaped slide guides greatly improve table rigidity and prevent feed wiggling. Iiedpfx Anjvu Tp As Doa Table description Cross table is well-made from high-quality materials Supports working with drilling, milling machines, etc., providing perfect positioning during machining processes Screw guard protects the feed mechanism from chips An additional benefit of the table is the pitch which provides a preview of the X,Y axes position of the table 2.5 mm/0.02 mm vernier

Condition: new, Year of construction: 2026, functionality: fully functional, 600x240 mm Cross Table Precise cross table with a screw guard, dovetail-shaped slide guides greatly improve table rigidity and prevent feed wiggling. Table description Iodpfx Ansvu Trwj Deia Cross table is well-made from high-quality materials Supports working with drilling, milling machines, etc., providing perfect positioning during machining processes Screw guard protects the feed mechanism from chips An additional benefit of the table is the pitch which provides a preview of the X,Y axes position of the table 4 mm/0.02 mm vernier

Condition: new, Year of construction: 2026, functionality: fully functional, Precise cross table with a screw guard, dovetail-shaped slide guides greatly improve table rigidity and prevent feed wiggling. Table description Cross table is well-made from high-quality materials Iedpfxsvu Uwuo An Dsia Supports working with drilling, milling machines, etc., providing perfect positioning during machining processes Screw guard protects the feed mechanism from chips An additional benefit of the table is the pitch which provides a preview of the X,Y axes position of the table 4 mm/0.02 mm vernier

Condition: new, Year of construction: 2026, functionality: fully functional, Cross table with precisely ground cast iron work surface. Equipped with T-slots which allow for workpiece fixture. Intended for processing, milling and drilling while preserving high precision due to a very accurate 0.02 mm vernier. Technical data Vice size 125 mm Base size 200×270 mm Table size 475×154 mm Transverse feed 150 mm Longitudinal feed 320 mm Vernier 0.02 mm Groove width 16 mm Screw spacing 175 mm Iijdpfx Aevu Tnxjn Dja Total dimensions 772×440×180 mm Weight 28 kg

Condition: new, Year of construction: 2026, functionality: fully functional, Precise cross table with a screw guard, dovetail-shaped slide guides greatly improve table rigidity and prevent feed wiggling. Table description of 185x100 mm Cross Table Cross table is well-made from high-quality materials Supports working with drilling, milling machines, etc., providing perfect positioning during machining processes Screw guard protects the feed mechanism from chips An additional benefit of the table is a pitch, which simplifies telling the X,Y axes position of the table 2.5mm/0.02mm vernier Ijdsvu Tqyspfx An Dsia

Condition: new, Year of construction: 2026, functionality: fully functional, Precise cross table with screw cover, sliding guides made using the "dovetail" method significantly improve the stiffness of the table and enable the elimination of play in feeds. Isdpfxsvu Tn Se An Doia Description of the cross table The cross table is solidly made of high-quality materials. Ideally supports work on drilling machines, milling machines, etc., thanks to which we achieve precise positioning when boring or drilling. Cross table equipped with a swivel base with a 360°/3mm pitch. Screw cover prevents chips from entering the feed working mechanism. An additional advantage of the table is a strip scale that facilitates constant viewing of the table's position in the X and Y axis Nonius 4 mm/0.02 mm

Condition: excellent (used), For sale: robust mounting plate/machine table with T-slots. Constructed from thick-walled steel, painted blue. Excellent base for installing large components, fixtures, or for measuring and machining applications. • Dimensions: 2570 x 770 x 200 mm Iijdow Rdtuopfx An Doa • Surface with T-slots • Precisely machined top section • Weight: 900 kg • Can be transported or loaded by forklift

Condition: used, Professional granite surface plate – renowned quality by Mitutoyo / Planolith (Made in Germany). Ideal for use in quality control, tool shops, and metrology. ⸻ Specifications: • Plate dimensions: approx. 1200 x 800 mm • Thickness: approx. 170 mm • Weight: approx. 460 kg • Accuracy class: DIN 876/0 (high precision) • Permissible deviation: 0.009 mm • Actual deviation: 0.00273 mm Iiedpfxeyw Ubqe An Dea • Manufacturer: Planolith GmbH / Mitutoyo • Country of manufacture: Germany • Includes: solid steel stand ⸻ Advantages: Very high measurement accuracy Stable construction – heavy granite dampens vibrations Ideal for measurements, marking out, and component inspection Professional equipment Ready for use ⸻ Condition: Used item – shows normal signs of wear (scratches visible on the surface), but is fully functional and maintains its specification parameters.

Condition: excellent (used), For sale: professional granite surface plate (marking-out plate) used in quality control and tool rooms. The plate is made of high-quality technical granite, ensuring excellent dimensional stability and wear resistance. Ideal for precise measurements, marking out, and component inspection. The unit is mounted on a robust steel stand. The equipment comes from an industrial facility. ⸻ Technical specifications • Type: surface plate / marking-out plate • Material: technical granite • Plate dimensions: approx. 1600 × 1000 mm • Thickness: approx. 200 mm Iiedpfx Asyuqtpen Dja • Weight: approx. 1014 kg • Base: steel construction The plate has a Trescal calibration sticker. ⸻ Applications • quality control • tool rooms • CNC industry • precision measurements • marking out components

Condition: new, Year of construction: 2026, Folding machine with exchangeable segments. Its simple construction ensures comfortable handling. Machine characteristics The folding machine has exchangeable segments on the upper and lower part. It gives extremely broad use for big elements as well as details folding. The segments are made of pressure iron castings, resistant to deformations and of exceptionally high strength. A simple construction secures high operation comfort and a broad range of practical use. The smallest segment possible to clamp is of 25 mm size and the biggest is of 270 mm size with a possibility of place change enable folding of any shape in the quality to be achieved. The sheet metal maximum thickness is 2 mm and the possibility of opening adjustment up to 48 mm make that there is practically no limits for this model. Segment dimensions 25 mm 30 mm 35 mm 40 mm 45 mm 50 mm 75 mm 100 mm 150 mm Iisdjmtwtmopfx An Doa 200 mm 250 mm 270 mm Technical data WORKING WIDTH 1270 mm MAXIMAL SHEET METAL THICKNESS 2,0 mm MAXIMAL OPENING LENGTH 48 mm BENDING ANGLE 0° - 135° NUMBER OF SEGMENTS 12 pieces DIMENSIONS 1710 mm x 750 mm x 1420 mm WEIGHT 422 kg The price is a net price. Price does not include shipping costs. For more information, please contact us by phone or e-mail. We invite you to familiarize yourself with the offer on our website.

Condition: new, Year of construction: 2026, The Cormak 25 column drill is a very efficient column drill, which is standardly equipped with a two-speed 1000 W motor with a rotation direction switch for right and left. The excellent design makes this device work very precisely. It has a table height adjustment using a toothed rack. The work table tilts from 0-45 degrees to the left and right. The set includes a 123 mm vice and a drill chuck. FREE MAGNETIC CHIP COLLECTOR ZW580! Technical data Maximum drilling diameter 25 mm Grip capacity 16 mm Iisderidn Sjpfx An Doa MK3 self-locking chuck The distance between the spindle and the column is 216 mm Maximum spindle stroke 80 mm Maximum distance of the table from the spindle 640 mm The distance between the pin and the column is 215 mm Maximum distance of the base from the spindle holder 1136 mm Table dimensions 355x355 mm Column diameter 92 mm Motor power 1000 W Overall dimensions 1635 x 642 x 356 mm Net weight 85 kg Spindle speed range Motor speed Spindle speed (min-1) 1400 min-1 160 240 290 350 410 480 530 590 660 720 1190 1350 1510 1970 2100 3000 700 min-1 80 120 140 170 200 240 260 290 330 360 590 670 750 980 1050 1500 Standard equipment 1000W two-speed motor Left and right rotations DTR in Polish CE declaration Optional equipment cooling system feeder

Condition: new, Year of construction: 2026, The very efficient Cormak 32 column drill is an ideal solution for professional workshops and small-scale production. Equipped with a 1500W two-speed motor with a rotation direction switch for right and left. It has a table height adjustment using a toothed rack. The work table tilts from 0-45 degrees to the left and right. Additionally, the Cormak 32 drill is equipped with a gravity cooling system. The set includes a 150 mm vice and a drill chuck. Technical data Maximum drilling diameter 32 mm Grip capacity 16 mm Spindle to column distance 254 mm Maximum spindle stroke 120 mm MK4 spindle mount Maximum distance of the table from the spindle 595 mm The distance between the pin and the column is 260 mm Maximum distance of the base from the spindle holder 1075 mm Table dimensions 475x425 mm Column diameter 92 mm Motor power 1.5 kW 400V power supply Gravity cooling system Overall dimensions 1670 x 760 x 475 mm Net weight 144 kg Spindle speed range Motor speed Spindle speed (min-1) Iiodpfxsridpws An Dsa 1400 min-1 120 200 250 360 400 450 950 1280 1520 1840 2440 3480 700 min-1 60 100 120 180 200 220 470 640 760 920 1120 1740 Standard equipment 1500W two-speed motor Left and right rotations DTR in Polish CE declaration Gravity cooling system Optional equipment feeder

Condition: new, Year of construction: 2026, Cross splitting wedge for 16-ton log splitters Iisdoycu T Aspfx An Dja Allows logs to be split into 4 parts. It features a universal mounting system compatible with most wood log splitters available on the market. Thanks to its universal mounting design, it fits the majority of commercially available log splitters. Manufacturer: Cormak

Condition: new, Year of construction: 2026, Cross splitting wedge for 14-ton log splitters Allows logs to be split into 4 parts. It features a universal mounting system compatible with most wood log splitters available on the market. Iodpfjycu R Uex An Djia Thanks to its universal mounting design, it fits the majority of commercially available log splitters. Manufacturer: Cormak

Condition: excellent (used), CATALOG NUMBER 7854 Technical data: - belt length: 2515x152 mm - belt width: 150 mm - oscillation - vertical oscillation movement - sanding length: 790 mm Isdpfx Ajyh H A Dsn Deia - table size: 840x300 mm - worktable for contoured elements: 300x250 mm - worktable adjustment: 80 mm - motor: 2.2 kW - sanding unit adjustable angle: 90-45 degrees - sanding head adjustment: 0-45 degrees - extraction port diameter: 100 mm - dimensions (length/width/height): 1450/600/1230 mm - weight: 138 kg ADVANTAGES – with oscillation – with shoe – suitable for contour and straight sanding – unit can operate vertically and horizontally – unpainted – used sander, very good condition Net price: 3,900 PLN Net price: 930 EUR (depending on the 4.2 EUR rate) (Prices may change with higher fluctuations)

Condition: new, Year of construction: 2026, Edge Sander Description: Sanding of curved materials using a side table. Simple and quick sanding belt replacement using a lever. Movable aggregate ensures horizontal and vertical operation. Additional table with adjustable height included as standard. Tensioning device ensures even sanding belt tension. Compact size of the device with a wide range of applications. Technical Data: Belt size: 2010 x 152 mm Worktable size: 790 x 221 mm Table height: 810 mm Stand height: 600 mm Additional rounding table size: 514 x 221 mm Maximum sanding length: 790 mm Dust extraction port diameter: 100 mm Edge and face sanding at an angle: 0 - 45° Belt speed: 840 m/min Motor power: 1.1 kW Power supply: 400 V Iiedpfx Aevuggzjn Dea Weight: 75 kg The price quoted is the net price. It does not include transportation costs

Condition: good (used), Clamping plate with T-slots, plate field, welding table, welding table, plate boring mill -Width: 1100 mm -Length: 2250 mm -Height: 200/100 mm -Working height: 820 mm -with supporting ribs -Groove width: 24 mm Iedpfx Aob A Nv Ion Dsia -Weight: approx. 2000 kg

Condition: new, Year of construction: 2026, functionality: fully functional, Key Features Reinforced construction – A rigid, heavy frame minimizes vibrations and ensures stability even under intensive use. Iisdpfow Hb D Dox An Dja Accurate sanding thickness adjustment – A mechanical height gauge allows precise setting of the desired processing depth. Precisely balanced sanding drum – Made of drawn aluminum, it ensures even contact with the material and effective cooling during operation. Versatile application – Suitable for removing old paint, lacquer, rust, as well as for smoothing and deburring. Durable metal drive coupling – Reliable torque transfer from the motor to the sanding drum. Working width up to 920 mm – Ability to sand wide panels in two passes. Construction and Technology The Cormak MM3146 stands out with its robust, industrial-grade design. The main motor, rated at 1.5 / 2.2 kW (S1/S6), combined with a reinforced 60 W feed motor, provides ample power for demanding and continuous operations. The variable-speed feed system (0–4 m/min) allows for adjustment to material type and desired finish quality. The sanding belt (2100 × 75 mm) is driven by a high-speed drum (2800 rpm), allowing for quick and effective material removal. The sanding drum is self-cooling during operation, eliminating overheating issues. A reinforced side guide enhances parallelism and stability across the entire working width. Precision and Efficiency The Cormak MM3146 drum belt sander ensures consistent results thanks to its mechanical height adjustment system with a precision scale. It supports a minimum workpiece thickness of 3.5 mm and a maximum working height of 100 mm, allowing both thin boards and thick construction components to be processed. A working width of 460 mm in a single pass (or 920 mm with dual-feed operation) provides flexibility for both small and large batch production. Applications The Cormak MM3146 through-feed sander is suitable for use in: Joinery and furniture manufacturing workshops Wood restoration studios Metalworking shops for deburring Production of plastic components Surface finishing lines for flat materials Standard Equipment Precision aluminum sanding drum Metal drum drive coupling Worktable: 460 × 465 mm Conveyor belt: 1120 × 450 mm Thickness gauge with precise scale Reinforced side guide Ø62 mm dust extraction port Optional Accessories Dust extraction system with chip separator Sets of sanding belts in various grits Infeed roller table Mobile base with brake Choose performance and professional surface finishing. The Cormak MM3146 400V drum sander is a reliable partner for both batch and one-off production – choose quality that delivers efficiency. Technical Specifications Parameter Value Motor Power S1/S6 1.5 / 2.2 kW, 400V Belt Speed 2800 rpm (for wood and metal) Sanding Belt Size 2100 × 75 mm Feed Belt Size 1120 × 450 mm Worktable Dimensions 460 × 465 mm Dust Port Diameter Ø62 mm Feed Speed 0–4 m/min Min. Material Thickness 3.5 mm Max. Working Height 100 mm Working Width 460 (920) mm Feed Motor Power 60 W Machine Dimensions 880 × 540 × 1230 mm Net/Gross Weight 134 / 160 kg

Condition: new, Year of construction: 2026, The CORMAK MM2315 230V woodworking sander is a high-performance oscillating edge sander designed for precise machining of flat and curved surfaces. Its construction is based on a stable sanding unit with an oscillation function and an adjustable work table, enabling effective and even sanding even under heavy workloads. It is an ideal solution for professional carpentry shops and production facilities expecting reliability, versatility, and high-quality finishing. Key Advantages Belt oscillation – ensures even abrasive wear and extended sanding belt lifespan Curved element sanding – additional side table enables precise machining of complex shapes Quick belt change – lever mechanism allows fast abrasive replacement without tools Adjustable sanding unit – enables both horizontal and vertical operation depending on the workpiece type High belt speed – 980 m/min ensures fast and efficient material removal Compact dimensions with broad capabilities – combines a small footprint with wide application potential Standard Equipment Height-adjustable work table Iisdpovugq Hjfx An Dsa Side table for curved element sanding Movable sanding unit for vertical and horizontal operation Belt oscillation system Quick belt tensioning and replacement mechanism Dust extraction port Ø100 mm Operation manual (Polish language) CE Declaration of Conformity Optional Equipment Professional dust extraction system with dust filter Set of sanding belts with various grit sizes Mobile base with locking mechanism Table with quick angle adjustment system Invest in durability, efficiency, and precision. Choose the CORMAK MM2315 230V wood sander and enhance your workshop’s machining capabilities today. Technical Data Belt size: 2515 × 152 mm Work table size: 840 × 300 mm End and edge sanding angle range: 0–45° Additional table size: 300 × 250 mm Table height adjustment: 80 mm Side fence size: 700 × 60 mm Maximum sanding length: 790 mm Dust extraction port diameter: 100 mm Belt speed: 980 m/min Motor power: 2.2 kW Power supply: 230 V Weight: 138 kg Warranty: 12 months Manual (DTR): Yes CE Declaration: Yes

Condition: new, Year of construction: 2026, Diameter of bolts in the set – 14 mm. Used for milling, iron working, mechanical and drilling processes. In the set: Extension nuts – 4 pieces Flanged nuts – 6 pieces T-slot nuts – 6 pieces Iiedpfxsvxtbto An Dja Stepped support – Support block, stepped (3 types, 4 pieces each) – 12 pieces Stepped clamp (3 types, 2 pieces each) – 6 pieces 3', 4', 5', 6', 7', 8' stud bolts - 4 pieces each Manufacturer: Cormak

Condition: new, Year of construction: 2026, PREMIUM MODELS ARE CHARACTERIZED BY HIGH RIGIDITY AND MAXIMUM PRECISION OF RESOLUTION WORKING IN FULL INTERPOLATION IN EVERY X, Y, Z AXIS. The machine has an "Innovation Opinion", which makes it easier to co-finance the purchase from EU funds. Iiedpfx Ajg Ngixon Dea A high-class CNC milling machine designed for material removal, due to a whole range of configurations, it is used in many industries: industrial, electronic, welding, carpentry, advertising, etc. These are efficient and precise machines equipped with friendly CNC control systems, thanks to so they can be easily operated by both experienced and novice operators. Training included in the price at our headquarters! MACHINE AVAILABLE ON STOCK! Technical parameters Spindle 5.5kW / 18000rpm. inverter, air-cooled Workspace 2100x3100 mm (up to 2680 x 3600 mm) Maximum spindle height 350mm Control DSP Software resolution 0.001mm Software INCLUDED Power 400V Weight 1450 kg Machine dimensions 2680 x 3600 x 2200mm Table height 715mm Vacuum pump 7.5kW Negative pressure 440mbar Guides linear Transfer rack (Z Axis - ball screw) Axis drives hybrid servo drives WARNING! The machine is equipped with the function of remembering the last G-code track. In the event of a power failure or interruption, it restarts from the last point without losing time or material. Optional equipment Vacuum pump: Becker KVT 3.140 129 m3/h The highest class safety barriers: Optional top-quality light barriers available. The safety zone determined by the sensors does not allow you to enter the machine's working area. A set of barriers ensures the safety of the operator. Z-axis gate height up to 450 mm UCANCAM V11 software (possibility to import files from Corel, Autocad). File import/export, editor and insertion of these text. Tool set: cutters, drills, holders. *Unloading and placing the machine on the customer's side. Equipment Air-cooled spindle, premium version Hybrid servo drives Elevated gate in the Z axis by 350 mm Vacuum table - 4 independent vacuum sections + T-groove table for manual material clamping (handles included) Vacuum pump 5.5 kW included in the price Tool measurement sensor included Software included Tools, collet set, leveling feet and other accessories DSP control - digital data processing The machine is equipped with the function of remembering the last G-code path - in the event of a failure or power interruption, it starts working from the last point without losing time and material. The price is a net price. Price does not include shipping costs. For more information, please contact us by phone or e-mail. We invite you to familiarize yourself with the offer on our website.

Condition: new, functionality: fully functional, Year of construction: 2026, CORMAK MM3166P Wide Belt Sander – Durable and Reliable for Workshop or Professional Use The CORMAK MM3166P wide belt sander is a robust and dependable machine, ideal for both home workshops and professional woodworking environments. With its advanced features and solid technical specifications, it enables fast, accurate sanding of wood materials, delivering a perfect finish on every project. Key Features: Dual sanding drums ensure even and precise sanding across the workpiece. Conveyor belt system facilitates smooth material feed and consistent sanding results. Powerful motor (2200 W + 120 W) guarantees effective sanding, even on harder materials. Adjustable sanding belt speed allows you to match the speed to the type of material being processed. Dust extraction system ensures a cleaner working environment and protects the operator from inhaling fine dust. Sturdy construction guarantees long-term durability and operational stability. Voltage options: Available in both 230 V and 400 V (50 Hz) versions – choose what suits your setup. Wide sanding belt (635 mm) enables fast processing of large surface areas. Material thickness capacity: Min. 7 mm, Max. 125 mm. Iiodpfx Ansxfhh Do Dja Sanding drum diameter: 150 mm. Sanding belt speed: 14 m/s. Two dust extraction ports (100 mm diameter) for easy connection to dust extraction systems. Technical Specifications: Parameter Value Belt length 800 mm Belt width 635 mm Roller radius R 120 Max. workpiece thickness 130 mm Main motor power 2.2 kW Voltage 400 V Frequency 50 Hz Motor speed (at 220 V) 1800 RPM Feed motor power 120 W Feed speed 1.8 – 7.3 m/min Dust port diameter 100 mm (x2) Net / Gross weight 220 / 260 kg Machine height 1113 mm Machine width (side view) 1100 mm Machine width (top view) 1060 mm Drum length 635 mm Manufacturer: Cormak

Condition: new, Year of construction: 2026, functionality: fully functional, Machine Description The latest model of a single-drum sander with a dust extraction bag from the Cormak brand. The sander has been enhanced with new technological solutions to ensure more precise processing of wood, metal, and plastic materials (removal of old paint, derusting, sanding, deburring, etc.). Thanks to the efforts of our technical and design team, we have achieved: A massive construction significantly heavier than the previous version Reinforced side guide of the sanding drum, improving rigidity and ensuring high precision of the workpiece over a working surface of 460 (920) mm Metal coupling transmitting drive from the motor to the sanding drum A precise mechanical gauge for easy reading of the desired sanding thickness The sanding drum, made of drawn aluminum, is precisely balanced and self-cooling, included with the machine Technical Specifications Motor Power: S1/S6 1.5 / 2.2 kW 230V Belt Speed: 2800 rpm (for wood and metal) Roller Belt Dimensions: 2100 x 75 mm Feeder Belt Dimensions: 1120 x 450 mm Iedpsw Hb Atofx An Dsia Worktable Dimensions: 460 x 465 mm Dust Port Diameter: Ø62 mm Feed Speed: 0~4 m/min Minimum Material Thickness: 3.5 mm Maximum Working Height: 100 mm Working Width: 460 (920) mm Reinforced Feed Motor: 60 W Dimensions: 880 x 540 x 1230 mm Net/Gross Weight: 134 / 160 kg Manufacturer: Cormak

Condition: new, Year of construction: 2026, Diameter of bolts in the set – 10 mm. Used for milling, iron working, mechanical and drilling processes In the set: Iodpfxevxtaio An Deia Extension nuts – 4 pieces Flanged nuts – 6 pieces T-slot nuts – 6 pieces Stepped support – Support block, stepped (3 types, 4 pieces each) – 12 pieces Stepped clamp (3 types, 2 pieces each) – 6 pieces 3', 4', 5', 6', 7', 8' stud bolts - 4 pieces each Manufacturer: Cormak

Condition: new, functionality: fully functional, Year of construction: 2026, CORMAK MM3166P Wide Belt Sander – Durable and Reliable for Workshop or Professional Use The CORMAK MM3166P wide belt sander is a robust and dependable machine, ideal for both home workshops and professional woodworking environments. With its advanced features and solid technical specifications, it enables fast, accurate sanding of wood materials, delivering a perfect finish on every project. Key Features: Dual sanding drums ensure even and precise sanding across the workpiece. Conveyor belt system facilitates smooth material feed and consistent sanding results. Powerful motor (2200 W + 120 W) guarantees effective sanding, even on harder materials. Adjustable sanding belt speed allows you to match the speed to the type of material being processed. Dust extraction system ensures a cleaner working environment and protects the operator from inhaling fine dust. Sturdy construction guarantees long-term durability and operational stability. Wide sanding belt (635 mm) enables fast processing of large surface areas. Iiedjxfhn Dopfx An Dja Material thickness capacity: Min. 7 mm, Max. 125 mm. Sanding drum diameter: 150 mm. Sanding belt speed: 14 m/s. Two dust extraction ports (100 mm diameter) for easy connection to dust extraction systems. Technical Specifications: Parameter Value Belt length 800 mm Belt width 635 mm Roller radius R 120 Max. workpiece thickness 130 mm Main motor power 2.2 kW Voltage 230 V Frequency 50 Hz Motor speed (at 220 V) 1800 RPM Feed motor power 120 W Feed speed 1.8 – 7.3 m/min Dust port diameter 100 mm (x2) Net / Gross weight 220 / 260 kg Machine height 1113 mm Machine width (side view) 1100 mm Machine width (top view) 1060 mm Drum length 635 mm Manufacturer: Cormak