Used High-Performance Grinding Wheel for sale (39,866)

Condition: good (used), High-performance grinding spindle, internal grinding machine, internal grinding device, internal grinding spindle -Handover: in current condition as viewed -Condition: without grinding spindle -Grinding spindle for: Lathe -electric: operated -Motor: VEM 0.75 kW -Bracket: Ø 80 mm -Dimensions: see photos Iiodovzxlijpfx Aa Ejd -Total dimensions: 600/370/H350 mm -Weight: 60 kg

Condition: used, High-performance grinding spindle, internal grinding machine, internal grinding device, internal grinding spindle -Grinding spindle: for lathe -Electrically operated -Max. Speed: 6900 rpm Iijdpfx Aajc N N H De Eod -Admission: M42 x 1.5 mm -Dimensions: 600/390/H355 mm -Weight: 64 kg

Condition: good (used), Year of construction: 1972, Drilling capacity in steel 70 mm Drilling capacity in cast iron 80 mm Spindle holder MK 5 Spindle projection 400 mm Spindle stroke 240 mm Column diameter 250 mm Speed range, infinitely variable 45 - 1325 rpm 5 feeds 0.1, 0.14, 0.2, 0.28, 0.4 mm/rev Table size 880 x 660 mm Motor power 3 kW Iisdpfxst Uzk Ro Aa Eed Dimensions L x W x H 880 x 1200 x 2500 mm Machine weight 1400 kg Accessories / Special features: - Infinitely variable speed adjustment via PIV gearbox and reduction gear - Large clamping table 880 x 660 mm - Feed via cross lever - Large drilling depth adjustment with 240 mm fixed stop - Swivel table - Emergency stop switch - Coolant system Siegfried Volz Machine Tools Rüschebrinkstr. 151-153 DE - 44143 Dortmund - Wambel

Condition: excellent (used), Year of construction: 1993, wire diameter range: 2,4 - 3,8 mm nail length: 50 - 90 mm output: 820 nails/min Iedsd Ez Eropfx Aa Eoid

Condition: used, functionality: fully functional, Grinding wheel flange with counter flange and balancing weights two-part, consisting of • Flange cone for mounting with cone, marked 508x10 - 90x203.2 and 015 022 001 0 • Counter flange, marked 610x10 - 110x203.2 and 015 333 001 0, as well as mounted adjustable balancing weights Isdpfx Aey Nlh Esa Ejid Precision grinding wheel mounts for external cylindrical grinding machine Karstens K56, wheel bore H 203.20, large cone 60 mm 3 grinding wheel flanges with counter flange and balancing weights available The flanges are used. Price negotiable. Our asking price is €540.00 net, ex works, plus packaging costs. All technical data is subject to typographical errors and omissions. Sale exclusively to countries within the EU.

Condition: excellent (used), Year of construction: 2011, MODEL AMADA TOGU EU PRESCISION TOOL GRINDING MACHINE WHEEL CBN 150 MAX TOOL DIAMETER 160 MAX GRINDING DEPTH ,ONE CYCLE, 0.99 Iedjyyln Tepfx Aa Eoid SPINDLE MOTOR 1.5KW SPINDLE MOTOR SPEED 3000 RPM VERTICAL TRAVERSE 200 MACHINE WEIGT 470 KGS PWOER CONSUMPTION 4.8 KVA

Condition: used, Year of construction: 1969, grinding height 60 mm grinding width 120 mm grinding wheel diameter 600 mm grinding length mm workpiece height 60 mm total power requirement 50 kW weight of the machine ca. 7000 kg dimensions of the machine ca. m D I S K U S (Germany) Double Side Vertical Spindle Surface Grinder, C-Frame Design, with Rotary Workpiece Feeding System and Automatic Dressing Device Model DDS 600 CR-A Year 1969 Serial-No. 6672 _____ Grinding wheels Ø x bore, each 600 mm Grinding wheels height x width, approx. 60 mm Workpiece dimensions: Grinding height x grinding width, approx. 60 x 120 mm Vertical adjustment of each grinding head 150 mm External Ø of workpiece carrier disk, approx. 810 mm Feeds of rotary workpiece feed system 14 – 145 mm/sec Grinding wheel speeds, each, infinitely variable 765 rpm (24 m/s) Grinding spindle drive, each 22 kW Total electrical load, approx. 50 kW - 380 V - 50 Hz Total weight, approx. 7,000 kg Accessories / Special Features: * Rotary workpiece feed system with infinitely variable speed adjustment prepared with workpiece carrier disk approx. dia. 800 mm with relevant workpiece shaped pockets and after the grinding the parts will be automatically sorted out and collected in a collector box. * IONIC – Size Control Unit Model Nr. 9 So with measuring probe for the ground workpieces and with signal for the hydraulic infeed of the grinding wheel when size is not in order. * Automatic Dressing Device for the grinding wheels, hydraulically operated and with the automatic return of the grinding wheels after dressing cycle to the previously adjusted position and to continue the working cycle. Dressing cycle can be presetted by a timer or a manual release. * Manually operated infeed device of the Spindle slide to optimal workpiece thickness. * Spindle drives controlled by Ampere-Meters. * Separate switch cabinet. * Separate hydraulic unit. * Various carrier disks, etc. * Safety covers. * Central lubrication. Iiedpfxet Hw N He Aa Ejd * Large Coolant device with paperbandfilter This machine is ideal for double-sided simultaneous grinding of parallel workpiece surfaces by continuous method, for maximum output and accuracy in mass production (e.g. Piston rings, washers, hydraulic parts, and other punched parts.) Condition : Good . Machine can be inspected under power. Delivery : Ex stock, as inspected. Payment : Net, after conclusion of contract.

Condition: new, Norton new grinding wheel mm 355x40x127 Iedpsv Tw Nkofx Aa Eoid

Condition: new, Year of construction: 2022, Manual grinding wheel radius profiling device Isdpfohq Rk Eox Aa Esid

Condition: used, Year of construction: 2023, Cutting area: 5600x5600 mm 1x Gabbiani G 3 130 (56) - High-performance panel dividing saw 1x Compact label printer 1x "eye-M EVO" control console 1x Human-Machine Interface (HMI) software MAESTRO ACTIVE 1x Maestro pattern 1x High-performance, fixed air cushion table with guide, 2500x600 mm, with infeed rollers 3x High-performance, mobile air cushion table - 2500x600 mm, with infeed rollers 1x Double, lateral, automatic aligner with motor drive 1x Foot switch for START/STOP of the working cycle 1x Setup for grooving with height adjustment of the saw blade via the control system 1x "Autosetting" device on the saw carriage for cutting length/width Iodpjxlvktsfx Aa Ejid 1x Main saw blade motor 25 HP (18 kW) 50 Hz with star-delta starter 1x Quick clamping of the saw blades with mechanical flanges "AKE" 1x Selective collet chuck (area 0 - 1600 mm) 3x Additional double collet chuck 4x Additional collet chuck with single finger 1x Compact office label printer 1x Cut editor 1x Maestro optiwise - Advanced - No. 1 license 1x Maestro connect: Service agreement for 1 year (including "plug&play" gateway kit) 1x Base 1x MACHINE LANGUAGE: German 1x PC LANGUAGE: German 1x SPEC01 Special version 01 1x European safety regulations (CE marking) including 123 hours of on-site commissioning (within Germany) (daily working hours are 8 hours including travel time). including 1 day of online training MAESTRO OPTIWISE PRO (as needed) including MAESTRO CONNECT 1 year including MAESTRO PATTERN IMPORT (255€ free)!!! FULL MANUFACTURER'S WARRANTY IN THE FIRST YEAR !!! Storage location:

Year of construction: 2007, condition: used, control Siemens 840D grinding wheel diameter 900 mm Workpiece - grinding width 144 - 152 mm Workpiece - grinding dimension 22 - 25 mm turning speeds 24 m/s: 1.425 U/min Iiodpfjxq Hkujx Aa Ejd peripheral speed max. 25 m/sec capacity 37 kW total power requirement 75 kW weight ca. 18,0 t dimensions of the machine ca. L 4,9 x B 4,9 x H 2,6 m In our opinion, the machine is in good condition used condition. Double face side grinders The machine was used for the production of connecting rods. Accessories, tools and clamping devices shown are only part of the scope of delivery if this is noted in the additional information. Changes and errors in the technical data and information as well as Subject to prior sale!

Condition: used, Trumpf TruDisk 4002 (6 C) High-Power Solid-State Disk Laser with up to 4 kW The Trumpf TruDisk 4002 (6 C) is a state-of-the-art, efficient, and robustly built disk laser optimized for demanding industrial metalworking applications. Machine type: TruDisk 4002 (6 C) Manufacturer: TRUMPF Laser GmbH + Co. KG Year of manufacture: March 2016 Drawing number: 20-10-03-A204 No further testing was conducted in-house. Operating hours could not be read. The laser was operating flawlessly up until decommissioning. Features: - Top performance (up to 4 kW) - Excellent beam quality - Reliability & reflection safety - Energy-efficient, modular architecture - Ideal for a wide range of applications in the automotive industry, mechanical engineering, or surface processing Technical Highlights: - Power: From 80 W up to max. 4000 W in continuous operation (CW) - Wavelength: Approx. 1030 nm (Infrared, Yb:YAG) - Beam quality: Up to 2 mm·mrad (benchmark for exceptional quality), often with a range of 2–25 mm·mrad - Output options: Modular configuration – up to 4 outputs possible (depending on series) - Optional cooling: Water-cooled, e.g., via KLH chiller or integrated heat exchanger/compressor - Modular design: Robust optical layout, efficient operation, power factor correction, energy-saving modes, PROFIenergy interface Typical Applications: - Laser welding (including hybrid or scanner-guided), e.g., for bodywork or gearboxes - Cutting / flame cutting of metals with high precision - Surface processing, coating applications, etc. – professional industrial use Supply voltage: 380 V (-10%) to 460 V (+10%), 3-phase AC + PE Iiodpfx Aasziyaaj Esd Frequency: 50 – 60 Hz Power consumption: 22 kW / 23 kVA Rated current: 325 A at 400 V Protection class: IP54 Short-circuit resistance: Icn / SCCR 50 kA Weight: 850 kg Condition: Used Scope of delivery: (See images) (Specifications subject to change and errors excepted!) Should you have any further questions, feel free to contact us by phone.

Condition: used, Trumpf Trumpf TruDisk 4002 (6 C) High-Power Solid-State Disk Laser with up to 4 kW The Trumpf TruDisk 4002 (6 C) is a state-of-the-art, efficient, and robustly engineered disk laser optimized for demanding industrial metalworking applications. System type: TruDisk 4002 (6 C) Manufacturer: TRUMPF Laser GmbH + Co. KG Year of manufacture: March 2016 Drawing number: 20-10-03-A204* No further in-house inspection was performed. Operating hours could not be read out. The laser was operating flawlessly until decommissioning. It offers: Iedpozix U Aofx Aa Eeid - Top performance (up to 4 kW) - Excellent beam quality - Reliability & reflection safety - Energy-efficient, modular architecture Ideal for diverse applications in the automotive industry, mechanical engineering, or surface processing. Technical Highlights: - Power: From 80 W up to max. 4000 W in continuous operation (CW) - Wavelength: Approx. 1030 nm (infrared, Yb:YAG) - Beam quality: Up to 2 mm·mrad (a benchmark for excellent quality), typically ranging from 2–25 mm·mrad - Output options: Modular configuration – up to 4 outputs possible (depending on model) - Optional cooling: Water-cooled, e.g. via KLH chiller or integrated heat exchanger/compressor - Modular design: Robust optical configuration, efficient operation, power factor correction, energy-saving modes, PROFIenergy connectivity Typical applications: - Laser welding (also hybrid or scanner-controlled), e.g. bodywork or gear assemblies - Cutting / flame cutting of metals with high precision - Surface processing, coating applications, etc. – for professional industrial use Supply voltage: - 380 V (-10%) to 460 V (+10%), 3-phase + PE - Frequency: 50 – 60 Hz - Power consumption: 22 kW / 23 kVA - Rated current: 32.5 A at 400 V - Protection class: IP 54 - Short-circuit strength: Icn / SCCR 50 kA - Weight: 850 kg Condition: used Scope of supply: (see picture) (Subject to modifications and errors in technical data and specifications!) We are happy to answer further questions for you by phone.

Condition: used, Year of construction: 2004, grinding wheel diameter 660 mm Control Siemens 840D work piece width min. 5 / max. 180 mm max. workpiece diameter 200 mm weight of the machine ca. 15,0 t dimensions of the machine ca. L 3,1 x B 4,0 x 2,7 m In our opinion, the machine is in good used condition. The machines were used for the production of connecting rods. Two machines are available. One machine is suitable for pre-grinding and one for regrinding. Accessories, tools, and clamping devices shown are only included in the scope of delivery if noted in the additional information. Iiedpfxjxq R Hae Aa Esd Subject to changes and errors in the technical data and information, as well as subject to prior sale!

Condition: good (used), 3D Systems Iiodpfx Aszii Umsa Ejd Type: ProX™ 800 ProX™ 800 3D Production Printer by 3D Systems – High-performance SLA Printer Machine has been regularly maintained Operating hours: 18,700 (as of 18.04.2023) Not operated after 18.04.2023 Note: Annual servicing carried out up to dismantling For sale is a used ProX 800 stereolithography (SLA) production printer from 3D Systems. This large-format SLA system is equipped with the latest printhead technology and is suitable for high-precision components and industrial applications (e.g. automotive, aerospace, medical technology). Additional features: - Automatic material replenishment system and pre-assembled material supply module (quick module change, uninterrupted operation) - 3D-Manage™ software for CAD model and print job management - Touchscreen operation on the device (Print3D Pro™) - Status/signal light module, central user interface - Comprehensive safety system including laser safety monitoring (Class I), emergency stop switches, and interlocks - Detailed maintenance and error diagnostics functions - Material container (MDM) Technical Data: - Printing technology: Stereolithography (SLA) with frequency-tripled Nd:YVO4 UV solid-state laser (355 nm, max. 3 W) - Maximum build volume: approx. 650 × 750 × 550 mm - Dimensions (L × W × H): approx. 1370 × 1600 × 2260 mm - Weight: approx. 907 kg - Resolution: up to 0.00127 mm (laser spot size), 4000 DPI - Accuracy: ± 0.025–0.05 mm per inch - Materials: Wide range of Accura resins (tough, transparent, high-temperature resistant, biocompatible, etc.) Electrical connection: - Power supply: 200–240 V AC - Frequency: 50/60 Hz - Phase: Single-phase - Fuse: 30 A - Weight: approx. 1200 kg incl. material module Condition: used Scope of delivery: (see picture) (Specifications and technical details subject to change and errors!) If you have further questions, we are happy to answer them by phone.

Condition: used, Trumpf TRUMPF TruDisk 4002 (4 C) High-Performance Solid-State Disk Laser with up to 4 kW Output Type: TruDisk 4002 (4 C) Isdpfx Aaozii Nqe Eeid The TruDisk 4002 is a powerful, energy-efficient, and modular laser solution – ideal for industrial manufacturing environments with demanding requirements for quality, precision, and automation. The combination of high power, excellent beam quality, and smart factory features makes it particularly attractive for modern production lines. System type: TruDisk 4002 (4C) Manufacturer: TRUMPF Laser GmbH + Co. KG Year of manufacture: May 2012 Drawing number: 20-10-02-A3* No additional tests were carried out in-house. Operating hours could not be read out. The laser operated flawlessly until decommissioning. Technical features: Output & wavelength: 80–4000 W at 1030 nm Beam quality (BPP): typically 2 mm·mrad (up to 25 mm·mrad, depending on configuration) Modular & compact: footprint < 1 m², modular design simplifies maintenance/service Efficient energy & cooling systems: energy-saving modes, active power factor correction, pulse function to reduce consumption Flexible cooling: integrated heat exchanger (5–28 °C), optional with compressor (up to 38 °C inlet temperature) Reflection-resistant: special resonator design also suitable for highly reflective metals Industry 4.0 capable: extensive sensor technology and data interfaces for condition monitoring, OPC UA, predictive maintenance Application areas: Scanner & hybrid welding (e.g. automotive body manufacturing, shipbuilding) High-speed cutting, including on reflective metals Flame cutting & surface processing Laser cladding, hardening, deep penetration welding where high precision is required Technical data: Supply voltage: 380 V (-10%) to 460 V (+10%), 3AC + PE Frequency: 50 – 60 Hz Power consumption: 23 kW / 25 kVA Rated current: 34 A at 400 V Protection rating: IP 54 Short-circuit strength: Icn / SCCR 50 kA Weight: 850 kg Condition: used Scope of delivery: (See picture) (Specifications subject to change and errors excepted!) We would be happy to answer any further questions by phone.

Condition: used, Trumpf TRUMPF TruDisk 6602 (4C) High-Power Disk Laser with up to 6.6 kW Type: TruDisk 6602 (4C) The TRUMPF TruDisk 6602 (4C) is a high-performance disk laser offering approximately 6.6 kW of continuous power output – perfectly suited for welding, cutting, and surface treatment processes for metals such as steel, aluminum, copper, etc. System type: TruDisk 6602 (4C) Manufacturer: TRUMPF Laser GmbH + Co. KG Year of manufacture: November 2012 Iiedpfx Ajzii D Iea Ejd Drawing number: 20-10-02-A5 No further in-house inspection has been performed. Operating hours could not be read out. The laser was operating flawlessly until decommissioning. Key Technical Features: • Power: Continuously adjustable from 80 W up to 6,600 W, max. 6.6 kW for machine tool applications • Beam quality: < 2 mm·mrad for excellent focus handling • Wavelength: 1030 nm (infrared), adaptable to green wavelength for specific models • Output options: Up to 4 laser outputs (4C) for simultaneous supply of multiple process cells • Cooling system: Integrated heat exchanger (up to 28°C inlet temperature), optional compressor cooling (up to 38°C) • Modular and service-friendly: Compact footprint (< 1 m²), modular components for fast maintenance and service Benefits & Applications • Maximum process stability: Real-time power regulation ensures reproducible results • Reflection resistance: Patented resonator design enables welding of reflective metals such as copper and aluminum • Industry 4.0 ready: Sensor-integrated monitoring system, OPC-UA interface for condition monitoring & predictive maintenance • Energy efficiency: Up to 50% reduction in power consumption thanks to intelligent pulse control and energy-saving modes • Versatility: Application range includes welding (including BrightLine for nearly spatter-free seams), cutting, hardening, casting processing, additive manufacturing, laser wire deposition welding, and more Suitable Use Cases: Ideally suited for industrial high-power laser applications: Application | Features ---|--- Automotive structural part manufacturing | Deep penetration welding with high reproducibility Copper welding | Particularly suitable with green wavelength (> 95% spatter reduction) Remote hybrid welding | Fast processing of large surfaces with robust beam Additive manufacturing & hardening | Enabled by excellent beam quality and compact design Main Technical Data Property | Specification ---|--- Laser power | Up to 6,600 W (6.6 kW), continuous Beam quality | < 2 mm·mrad Wavelength | 1030 nm (infrared) Number of outputs (4C) | Up to 4 simultaneously usable fiber outputs Fiber connector diameter | 100–600 µm (depending on configuration) Beam delivery | Fiber-based, passive (no deflection mirrors required) Cooling | Water/air-cooled, internal or external chiller Dimensions | Approx. 1000 × 800 × 2100 mm (W×D×H, variant-dependent) Weight | ~800–1200 kg (excluding cooling) Power supply | 380 V - 10% ... 460 V +10%, 3-phase AC + PE, 38 kW / 41 kVA, 59 A / 400 V, 50–60 Hz Control | TruControl 1000/3000, OPC-UA interface Safety standards | Laser safety class 4 according to EN 60825-1 Weight: approx. 1200 kg Condition: used Scope of delivery: (See image) (Subject to changes and errors in the technical data. Information may be subject to alteration!) We are happy to answer any further questions you may have by phone.

Condition: excellent (used), Pfeiffer DUO 65 Two-Stage High-Performance Rotary Vane Pump Here we offer a Pfeiffer DUO 65 two-stage high-performance rotary vane pump. Pfeiffer DUO 65 Two-Stage High-Performance Rotary Vane Pump Two-stage high-performance rotary vane pump with a pumping speed of up to 70 m3/h. With a 3-phase motor. With a temperature sensor (3TF) for optimal motor protection. Integrated gas ballast and HV safety valve. Iiodpfxozianqs Aa Eod For all applications in the coarse and fine vacuum range. Duo 65, 3-phase motor, 3TF, 200-230 / 346-400V, 60 Hz Type: PK D46 642 A with ONF 35/65 oil mist separator, corrosion-resistant version. It sits on the pump's exhaust nozzle and prevents air pollution by oil mist. Type: PK Z40 150 Scope of delivery: (See picture) We will gladly answer any further questions you may have over the phone. Written orders can be placed via email or fax.

Condition: new, Technical data: Drilling capacity in steel: 50 mm Tapping capacity: M33 face milling cutter: 100 mm end mill: 25 mm spindle: MK 4 throat depth: 340 mm Speeds: (6) 50 - 1510 1/min quill stroke: 200 mm quill feed: 0,1 / 0,2 / 0,3 / 0,4 mm/rev table size: 820 x 240 mm traverse path X: 460 mm traverse path Y: 280 mm Iisdspxmlqjpfx Aa Ejd column diameter: 180 mm Number of T-slots: 4 T-slot size: 16 x 26 mm motor power: 3 kW Weight, approx.: 750 kg Equipment: - Cross table - thread tightening spindle - Thread cutting device - Automatic spindle feed - LED machine light - Rotatable table - Manual fine feed - Coolant device - Height adjustable protective cover - Limit switch protected spindle

Condition: used, Year of construction: 1989, functionality: fully functional, power: 22 kW (29.91 HP), input voltage: 380 V, input current: 50 A, input frequency: 50 Hz, cutting height (max.): 130 mm, cutting width (max.): 230 mm, saw blade diameter: 380 mm, height adjustment type: electric, saw blade bore: 80 mm, actuation type: electric, rotational speed (max.): 4,500 rpm, rotational speed (min.): 3,200 rpm, total length: 5,200 mm, total width: 2,500 mm, total height: 1,800 mm, overall weight: 4,300 kg, table height: 850 mm, Equipment: documentation/manual, rotational speed infinitely variable, saw blade guard, We are offering this used WEINIG KR 230 E high-performance parallel trimming saw with automatic return, manufactured in 1989. Additional equipment: - Electronic 1-axis adjustment with digital target/actual value display including subtraction electronics - Attachment sleeve for multi-blade cutting - Feed chain with screwed-on spikes - 2 lasers for indicating the saw blade position including adjustment spindle - Automatic cross and return conveyor - Central lubrication system Type: KR 230 E Year of manufacture: 1989 Machine No.: 24484 Serial No.: 91300 Order No.: 91307 Operating voltage: 380 V Frequency: 50 Hz Rated current: 50 A Wiring diagram No.: 862218 Iiedpjzkhbbsfx Aa Esd Weight: approx. 4,300 kg If you have any questions or require further information, please do not hesitate to send us a message or call us.

Condition: excellent (used), functionality: fully functional, machine/vehicle number: 211619.00, grinding wheel diameter: 275 mm, mount diameter: 160 mm, 2 new, unused grinding wheel flanges Reishauer part no. 211619.00 for grinding worms Ø275 / 160x160 for Reishauer grinding machine RZ160 / RZ260 Flange for mounting grinding tools with a bore diameter of 160mm and a width of up to 160 mm 300x160x160 Price negotiable Our asking price is €1,270.00 net, ex works, plus packaging costs. All technical data is subject to printing and typographical errors. Iodpsx Eiycofx Aa Ejid Sale exclusively within EU countries.

Condition: used, Grinding wheels, grinding bodies -Outer diameter: 555mm -Width: 110mm -Inner diameter: 203mm -T1707801 -Weight: 50.5kg Isdpfxsd Sqyfs Aa Esid

Condition: good (used), Grinding wheel holder, standard flanges, special flanges, grinding wheel flange Iodewvp A Tjpfx Aa Eoid -Grinding wheel holder: Holder: Ø 127 mm -Mounting: Hole shaft cone Ø 30-39 mm -Type designation: not available -Dimensions total Ø 180 x 75 mm -Weight: 5.9 kg

Condition: good (used), Grinding wheel holder, standard flanges, special flanges, grinding wheel flange Iedpowux Ucofx Aa Esid -Grinding wheel holder: Holder: Ø mm -Mounting: Hole shaft cone Ø 34-43 mm / M50 -Type designation: not available -Dimensions total Ø 180 x 80 mm -Weight: 7 kg

Condition: good (used), Grinding wheel, double bench grinder, surface grinder, cylindrical grinder -Inner diameter: 32 mm -Outer diameter: Ø 250 mm -Width: 6 mm Price: per piece -Quantity: 40x available Iiodpfsb A Ryfsx Aa Eed -Weight: 0.6 kg