Used Nibbler Trumpf for sale (382)

Condition: excellent (used), TruTool PN 200 electric hand cutting machine Product features The new TruTool PN 200 vibrating shear is mainly used for cutting C-L-U sections, trapezoidal sheet metal, etc. components. The device with a short tool for processing sheet metal with a profile depth of up to 85 mm and for C-L-U sections. Also for corrugated sheet metal. Ideal for hard-to-reach places. The working direction can be adjusted 360° easily and without tools in 45-degree steps. Minimized set-up time Replacement of punch and yoke without interruption and without tools. Unmatched speed Fast and efficient, 2.1 meters per minute at 400 N/mm2 structural steel. Application: Trapezoidal sheet metal For cutting profiles up to 86 mm deep and 132.5 / 40 mm wide. For straight and diagonal cuts. Profiles For cutting C-L-U profiles. Corrugated sheet Ljdpfsuhm E Sex Ab Uohn For cutting and slitting. For bevel cuts and internal and radial cuts. - MAXIMUM SHEET THICKNESSES: - MAXIMUM THICKNESS OF 400 N/MM² STEEL SHEET: 2 mm. - MAXIMUM THICKNESS OF STEEL 600 N/MM²: 1.5 mm - MAXIMUM THICKNESS OF STEEL SHEET 800 N/MM²: 1 mm - MAXIMUM THICKNESS OF SHEET METAL MADE OF ALUMINUM UP TO 250 N/MM²: 3 mm - RADIANCES: - LOWEST RADIUS: 50 mm - GENERAL INFORMATION: - OPERATING SPEED: 2.1 m/min. - NUMBER OF SHAKES AT NOMINAL LOAD: 1500 1/min. - INITIAL HOLE DIAMETER: 24 mm - RATED POWER CONSUMPTION: 550 W

Condition: good (used), functionality: fully functional, Year of construction: 2003, operating hours: 82,000 h, control type: CNC control, controller manufacturer: Siemens, laser type: CO₂ laser, laser hours: 33,000 h, laser power: 5,000 W, sheet thickness steel (max.): 25 mm, sheet thickness stainless steel (max.): 20 mm, sheet thickness aluminum (max.): 12 mm, travel distance X-axis: 3,000 mm, travel distance Y-axis: 1,500 mm, travel distance Z-axis: 115 mm, Equipment: cooling unit, dust extraction, safety light barrier, AVAILABLE AT SHORT NOTICE! TRUMPF Trumatic L 3050 – 5 kW MACHINE WAS COMPLETELY OVERHAULED IN 2018! TECHNICAL DATA: Manufacturer: TRUMPF Model: Trumatic L 3050 – 5 kW Year of manufacture: 2003 Working area: 3,000 x 1,500 x 115 mm Control: Siemens Sinumerik 840 D Laser power: 5,000 watts Max. sheet thickness (steel): 25 mm Max. sheet thickness (stainless): 20 mm Max. sheet thickness (aluminium): 12 mm Operating hours: approx. 82,000 h / 33,000 h STANDARD FEATURES: - Enclosed machine frame with integrated laser unit - Laser unit: CO2 laser TLF 5000, high-frequency excited, chiller, logbook function - Automatic pallet changer - Longitudinal conveyor belt for small parts/scrap - Drives: Gantry drive combined with linear direct drives - Laser power control - HI-LAS high-pressure cutting - Plasma sensor system PMS - Fast processing with SprintLas - ContourLas for producing small holes Ljdjxg Nh Uspfx Ab Ushn - Programmable power cycles - Microweld - Programmable cutting gas pressure setting - Laser cutting head with 5" lens and laser cutting head with 7.5" lens - Quick-change device for cutting head - Automatic sheet edge detection - Capacitive height control (DIAS) - Process Control System (PCS) - Positioning laser diode - Automatic focus position adjustment AutoLas Plus - Automatic switch-off - Work area lighting - Control SIN 840D: Open PC-based control, easy operation, online help, diagnostic functions, maintenance log, technology data, teleservice - Shopfloor programming ToPs 100 lite - Safety: multi-beam light barriers, fully encapsulated and nitrogen-flushed beam guidance, monitoring system, multi-chamber extraction and compact dust extractor, safety cabin - Network connection: BNC/RJ-45 network port - Electrical equipment for 400 V / 50 Hz three-phase power - Paint finish: textured paint white RAL 9002 / gentian blue RAL 5010 ADDITIONAL EQUIPMENT: - Additional laser cutting head with 9-inch lens

Condition: good (used), Year of construction: 2006, operating hours: 20,000 h, Trumpf Haas HL 4006D YAG Solid-State Laser Lhsdpjxg Hpcsfx Ab Uen The Trumpf Haas HL 4006D is a 4000W Nd:YAG solid-state laser designed for industrial applications such as welding highly reflective materials, especially for use with robots and with a range of up to 100 meters via flexible fiber optics. Areas of Application Welding: The main application is welding metal parts, especially highly reflective materials such as aluminum and copper, where other lasers are difficult to use. Automated Manufacturing: The laser is designed for integration into automated production lines with industrial robots. Precision Machining: The high power and precise beam quality enable precise work in industrial machining. Technical Specifications Manufacturer: Trumpf Haas Type: HL 4006D Nominal laser power: 4000 W Beam quality: 25 mm.mrad Laser light wavelength: 1064 nm Nominal voltage: 400 V Nominal power: 132 kW Nominal power consumption: 140 kVA Year of manufacture: Oct 2006 Weight: 1500 kg Operating hours: approx. 20,000 Dimensions (W x H x D): 3200 x 1700 x 1250 mm Laser optics including ILV scanner, pyrometer, and various spare parts Computer with WinLas software for parameter control You can find the right cooling unit and robot in our shop Rehsler TW HL4006D Cooling Unit Kuka KR 30/2 6-Axis Welding Robot Other items - new and Used - find it in our shop! International shipping costs on request!

Condition: good (used), functionality: fully functional, Year of construction: 2010, laser power: 4,000 W, CNC Laser Cutting System TruLaser 3030 (L20) 4000 Watt X Working area max.: 3000 mm Y Working area max.: 1500 mm Z Working area max.: 115 mm Control: Siemens Sinumerik 840D SL Laser power: 4000 Watt Operating hours: 35,881 h Laser on-time: 18,757 h Sheet thickness St. max.: 20 mm Sheet thickness SS max.: 15 mm Sheet thickness Al. max.: 8 mm Standard machine equipment Machine - Enclosed machine frame with integrated laser unit - Motion unit for high-precision machining - Torque drive combined with linear direct drives - Enclosed beam guidance - Single cutting head strategy - Chiller unit - Automatic pallet changer (longitudinal) - Wide longitudinal conveyor belt - Ergonomic control panel with color touch display - Work area lighting - Positioning laser diode - Spray device - PierceLine - FocusLine - NitroLine - PlasmaLine - Transport and installation device TRUMPF Laser - CO2 laser TruFlow 4000 with optimized standby mode - Maintenance-free turbo radial blower - High-frequency excitation - TASC laser control - Laser power control - Laser logbook function Cutting head - Lens cutting head with 250 mm lens - Universal quick-change device (UTI) with bus interface - LensLine with condition monitoring - ControlLine: height control and sheet edge detection Control - SINUMERIK 840D SL control - 17" color touch screen - Easy operation - Simple workshop programming Lhodpfxoxdmgco Ab Uon - Advanced workshop programming - Fast re-manufacturing - Automatic shutdown - ContourLine - FastLine - FlyLine - Microweld - Production plan - AdjustLine - Teleservice via Internet Data transfer - USB interface - RJ-45 network connection Safety - CE marking - Light barriers - Multi-chamber extraction system - Compact dust extraction unit - Machine enclosure with Macrolon panels

Condition: ready for operation (used), Year of construction: 2000, control type: CNC control, working width: 3,100 mm, stroke length: 365 mm, type of crowning: CNC-controlled, power: 37 kW (50.31 HP), Hydraulic Press Brake Manufacturer: TRUMPF Model: TrumaBend V230 Year of manufacture: 2000 Technical Specifications Manufacturer: TRUMPF Model: TrumaBend V230 Year of manufacture: 2000 Press force: 230 t Bending length: 3060 mm Frame gap: 2690 mm Lodpfx Abjxdkzwe Ushn Throat depth: 410 mm Worktable: 200 mm Installation height: 535 mm Stroke: 365 mm Connection Values Electrical: 37 kW Pneumatics: 6+1 bar Hydraulic oil capacity: 400 l Dimensions: approx. 3.75 x 2.90 x 3.10 m (L x W x H) Weight: approx. 18.2 t Equipment • 2D graphic control Delem DA-65W • Controlled axes: X, R, Z1, Z2, Y1, Y2 • Hydraulic tool clamping top and bottom • WILA tool adapter • CNC-controlled crowning • Pneumatic die shifting • 2 support arms, laterally adjustable All information given without guarantee. A powered demonstration is possible at any time in our exhibition hall.

Condition: ready for operation (used), functionality: fully functional, Year of construction: 2016, TRUMPF TruBend Cell 5000 – Robotic Bending Cell | Year 2015 TruBend 5130X Press Brake BendMaster Robotic Bending System Control System: TASC 6000 (robot and press are programmed via the machine interface) Press Brake Specifications: Press force: 130 tons Lodpfxoxdfqmj Ab Ushn Bending length: 3,250 mm Year of manufacture: 02.2016 More information and video available on request ...

Condition: ready for operation (used), functionality: fully functional, Year of construction: 2008, controller model: Siemens Sinumerik 840D, travel distance X-axis: 6,000 mm, travel distance Y-axis: 2,000 mm, travel distance Z-axis: 115 mm, workpiece weight (max.): 4,800 kg, Trumpf TruLaser with LoadMaster! TECHNICAL DETAILS X-axis: 6,000 mm Y-axis: 2,000 mm Z-axis: 115 mm Workpiece Max. weight: 4,800 kg Lsdpfx Abexc U Ulo Uehn Maximum Speed Simultaneous: 300 m/min Accuracy Position deviation Pa: 0.05 mm Mean position deviation Ps: 0.03 mm MACHINE DETAILS Control: Siemens Sinumerik 840D Dimensions and Weight Dimensions (L x W x H): 16,950 x 5,550 x 2,550 mm Weight: 16,000 kg Resonator: 6 kW CO2 Beam operating hours: 25,000 h EQUIPMENT LoadMaster

Condition: excellent (used), Year of construction: 2007, bending force (max.): 230 t, working width: 3,230 mm, Pressbrake TRUMPF - TrueBend 5230 MACH-ID 9234 Make: TRUMPF Type: TrueBend 5230 Control: TASC 6000 Year: 2007 6 Axis back gauge X1/X2/R1/R2/Z1/Z2 Wila Crowning Wila NEW STANDARD II Tool clamping 4 cylinder construction 2 left / 2 right Lazer safe protection Closed door back side machine  1e owner machine fully Trumpf serviced Lhsdpfx Asxc U E Rob Ujn Max. bending length: 3230mm Distance between column: 2690mm Max. pressing force: 230T Dis. Beam - Table: 735mm Beam stroke: 615mm Troth beam: 220/Smm Approch speed: 25/Smm/min. Working speed: 220/Smm/min. Adjustment X-Axis back gauge:0-1000mm Length: 4150mm Width: 2055mm Height: 3000mm Weight: 19200kg

Condition: used, functionality: fully functional, Year of construction: 2007, working width: 4,250 mm, type of crowning: CNC-controlled, overall weight: 16,000 kg, total length: 6,000 mm, total width: 1,700 mm, total height: 3,000 mm, - Press beam operating hours: 9,874 h - Stroke: 600 mm - Force: 1,700 kN Lhjdpfxexcxy Ss Ab Uen - Working length: 4,250 mm - 5-axis backgauge - CNC crowning - Hydraulic tool clamping (top/bottom) - Die adjustment for hemming - CNC-controlled bending aid - Bendguard safety device - ACB angle measuring sensor

Condition: excellent (used), Year of construction: 1997, pressure 170 t chamfer lenght 4080 mm distance between columns 3680 mm column arm 410 mm dayligth 385 mm stroke 215 mm ajustment speed 200 mm/sec working feed 1-10 mm/sec return speed 135 mm/sec table width 200 mm table height 1050 mm Number of working hours 25.430 h oil volume 350 l total power requirement 29 KVA weight of the machine ca. 16.450 kg. range L-W-H 4620 x 2210 x 2885 mm Machine in good condition Regularly serviced by the manufacturer CNC backgauge with 8 axes (!!) - in checked conditions - machinevideo - ?v=yEaRj0XJAC4 Equipment: Lhjdpfx Absxcp Rbo Usn - CNC electro-hydraulic press brake/die bending press - DELEM CNC control - swiveling front left * High-resolution graphic screen * Clear, concise menus in the operator's language * Large tool and product library * Graphic 2D programming * Automatic bend sequence calculation and collision detection * Emergency stop button at front - CNC axis adjustment: * Y1 - Y2 - X1 - X2 - R1 - R2 - Z1 - Z2 axis + CNC crowning - X axis - adjustment speed: 500 mm/sec. * Max. stop range: 860 mm - R axis - Adjustment speed: 300 mm/sec. * Max. travel: 250 mm - Z axis - Adjustment speed: 1000 mm/sec. * Max. travel: 3260 mm - CNC electric motor table crowning - CNC electro-pneumatic die shift (I axis) - WILA / TRUMPF upper tool clamping - hydraulic - WILA / TRUMPF lower tool clamping - hydraulic - 2x front, robust support arms - movable - 1x freely movable 2-hand/foot control - 1x freely movable foot switch - Side safety device (swivel doors) - Rear safety device (sliding doors) - Original operating instructions

Condition: good (used), Year of construction: 1994, Offer 25051 Technical Data: Sheet thickness 4 - 160 mm Bevel angle standard 20 - 45 ° Bevel angle with special stripper 20 - 55 ° Max. bevel length, steel 400N/mm² 15 mm Max. bevel length, steel 600N/mm² 9 mm Max. bevel length, steel 800N/mm² 6 mm Pipe processing from 30 mm inner diameter Lhsdpfx Aboxf E Hds Ujn Internal cutouts from a diameter of 130 mm Working speed approx. 1.5 m/min Stroke rate approx. 210 strokes/min Drive 220 V / 2.0 kW Space requirement approx. W 550 x D 200 x H 300 mm Weight approx. 19 kg

Condition: used, functionality: fully functional, Year of construction: 2019, operating hours: 27,500 h, machine/vehicle number: S0711C0001, laser hours: 2,300 h, laser power: 1,000 W, laser wavelength: 515 nm, working range: 100 mm, Technical Specification Base Machine: TRUMPF TruPrint 1000: SN: S0711C001, Year of manufacture 2019, Installation December 2019 Build volume: Build cylinder diameter 100 mm, effective build area 97 mm, build height 100 mm Software version: H.M.I. Version 02.22.04 Operating hours: approx. 27,500 h* (including 2,290 h production time) *as of September 2023 Technical Specification Laser Unit: TruDisk 1020: SN L5210M0058 Power: Single laser, output power of 1000 W at the workpiece, green wavelength: 515 nm Operating hours: approx. 11,500 h* Additional Information: Lhedpsvptawsfx Ab Uen In September 2023, the system was inspected and uninstalled by TRUMPF Service. Up until this time, the machine was successfully producing high-quality parts in our facility (material used: copper alloy). Together with the system, you will receive the operating manual as well as the latest service report in digital format. The last maintenance contract with the manufacturer was valid until the end of May 2023. If you are interested or have any questions, please do not hesitate to contact us by phone or email. Additionally, a metal powder sieving unit from Piab Additive GmbH (formerly IB Verfahrenstechnik) can be purchased for €10,000.00.

Condition: used, Year of construction: 2019, machine/vehicle number: S1541C0016, 5-axis machining with flying optics, CNC control SIEMENS SINUMERIK 840D SOLUTIONLINE with TRUMPF HMI, travel ranges: X-axis 4000 mm, Y-axis 1500 mm, Z-axis 750 mm, extended Y-axis travel up to 2000 mm, laser power 4000 watts, laser unit TRUMPF TRUDISK001, with separate cooling unit and compact dust extractor. NOTE: The system is maintained annually by TRUMPF, corresponding maintenance records are attached! Lsdpoxccffofx Ab Uehn

Condition: excellent (used), Year of construction: 2007, bending force (max.): 85 t, working width: 2,210 mm, 6 Axis back gauge X1/X2/R1/R2/Z1/Z2 Wila Crowning Wila NEW STANDARD II Tool clamping 4 cylinder construction 2 left / 2 right Lazer safe protection Closed door back side machine  1e owner machine fully Trumpf serviced Max. bending length: 2210mm Distance between column: 1750mm Max. pressing force: 85T Dis. Beam - Table: 505mm Ljdpsxc Idyefx Ab Uehn Beam stroke: 385mm Troth beam: 420mm Approch speed: 220/Smm/min. Working speed: 25/Smm/min. Return speed: 220/Smm/min. Adjustment X-Axis back gauge:0-1000mm Length: 3020mm Width: 1800mm Height: 2375mm Weight: 7800kg

Condition: ready for operation (used), functionality: fully functional, Year of construction: 2009, installation height: 615 mm, pressing force: 320 t, Bending length [mm]: 4420 Press force [tons]: 320 Control system: TRUMPF TASC 6000 Operating hours [h]: 85,406 Hydraulic system on [h]: 30,735 Standard equipment: - Sturdy machine frame as a welded all-steel construction - Press beam with high flexural rigidity - Spherical mounting of the press beam with inclined press beam positioning - Electrohydraulic top-drive with 4-cylinder technology - Proportional valve technology and switchable double pump - Modern block hydraulics with control valves mounted directly on the cylinder - Electronic pressure scale - Measuring system with centrally mounted glass scales and temperature compensation Lhodpfxsxb Tyqj Ab Uen - Manually integrated wedge crowning system in the table - Upper tool clamping system "New Standard Clamping", manual, hardened, self-centering, for vertical tool change - Lower tool clamping with hydraulic clamping, hardened - Programmable lower tool displacement (pneumatic, 2 positions) - Backgauge system, 2-axis, with rack and pinion drive for X and R axes; 2 stop fingers adjustable safely from the front - Machine control: TASC 6000 - Operator console with LCD keypad, footswitch for emergency stop, up, and emergency-off - Safety equipment: integrated side doors and automatic rear roll-up cover - Control cabinet cooling (air-to-air heat exchanger) - Oil cooler - Network capable - Modern machine design - 4-axis backgauge system - Hydraulic upper tool clamping - CNC crowning - Preparation for ACB Automation BendMaster (150) - Floor track 8,000 mm - Two-sided safety fence

Condition: used, functionality: fully functional, Year of construction: 2004, degree of automation: manual, actuation type: electric, Equipment: fume extraction, Trumpf HL 1003D laser unit Beam quality of 12 mm mrad and a laser power of 1000W at the workpiece. 2 optics with cameras. Lhedpswxq H Esfx Ab Uen

Condition: good (used), functionality: fully functional, Year of construction: 2007, Table length: 3000 mm Table width: 1500 mm Laser power in watts: 3200 W Table height: 2200 mm Control: Siemens Approx. machine weight: approx. 12,000 kg Lhodpfx Aboxb Tnuo Ujn Machine dimensions: 9300x4600x2200 mm Operating hours (as of August 2025): Beam on: 6,537 h Laser on: 39,930 h

Condition: excellent (used), Year of construction: 2007, operating hours: 46,500 h, functionality: fully functional, sheet thickness steel (max.): 6 mm, table width: 2,050 mm, table length: 1,250 mm, Very good condition. I am selling beacause of buying new one. Lodpfx Abewf Ayws Uehn Maszyna do dyspozycji od grudnia 2025.

Condition: used, Year of construction: 2015, TYPE: L13 / S0540C0311 Year of manufacture: 2015 Laser on: 33,112 h Beam on: 8,166 h Lhodpfjxd Uawsx Ab Uon Power: 5,000 W X-axis travel: 4,000 mm Y-axis travel: 2,000 mm Z-axis travel: 750 mm B-axis travel: ±135° C-axis travel: n*360° Display: TFT 12" Interface: SINUMERIK 840D

Condition: good (used), Year of construction: 1997, machine/vehicle number: 887043, Offer 24557 Technical data: - max. working length 4060 mm - column clearance 3680 mm - max. pressing force 1700 kN - max. distance table / ram 385 mm - column projection 410 mm - ram stroke 215 mm - stroke speeds - downward speed idle max. 200 mm/sec - upward speed 135 mm/sec - downward pressing speed 1 to. 11 mm/sec - Total drive power 30 kW - Space requirement approx. W 5600 x H 3000 x D 2400 mm - Weight approx. 18000 kg - with: - with 6-axis CNC control DELEM - Two-hand control panel with foot switch - Crowning device - Controlled back stop with height adjustment 5 - 860 mm Lodpou T Nknjfx Ab Uehn - Hydraulic upper + lower tool clamping - Die table displacement pneumatically supported

Condition: good (used), functionality: fully functional, Year of construction: 2008, CNC Laser Cutting System TruLaser 3030 (L20) 5000 Watt Maximum Working Area: X-axis: 3000 mm Y-axis: 1500 mm Z-axis: 115 mm Control: Siemens Sinumerik 840D SL Laser Power: 5000 Watts Operating Hours: 59,167 hrs Laser On Time: 19,307 hrs Sheet Thickness Steel, max.: 25 mm Stainless steel, max.: 20 mm Aluminium, max.: 12 mm Standard Equipment Machine - Enclosed machine frame with integrated laser unit - Motion unit for high-precision processing - Automatic longitudinal pallet changer - Longitudinal conveyor belt - Torque drive combined with linear direct drives - Enclosed beam guidance - NitroLine - FocusLine - PlasmaLine - SprintLine - Spraying device - Positioning laser diode - Programmable cutting gas pressure - Single-cutting head strategy - Workspace lighting - PierceLine TRUMPF Laser - CO2 laser TruFlow 3200 with optimized standby mode - Maintenance-free turbo radial blower - High-frequency excitation - Beam telescope - Laser control TASC - Laser power control - Laser logbook function - Cooling unit Cutting Head - Lens cutting head with 250mm focal length - Universal quick-change cutting head system (UTI) - ControlLine: Height regulation and edge detection Control - 17" touch color screen - User-friendly operation - Online help - Integrated e-shop - Diagnostic functions - Integrated technology data - Auto shut-off - Teleservice - ContourLine - Microweld - FastLine Data Transmission Lhodpfx Aoxb Traeb Uen - USB interface - RJ-45 network connection Safety - CE marking - Light barriers - Monitoring system - Multi-chamber extraction system - Compact dust extraction unit - Machine enclosure with Makrolon panels + TruFlow 5000

Condition: good (used), functionality: fully functional, Year of construction: 2004, Press force: 300 t Bending length: 3050 mm Control: DNC 1200 PS Eco Machine weight approx.: 17,100 kg Oil capacity: 400 l Lsdpfx Absxb Szms Ujhn Accessories: - Foot pedal - Two-hand foot control - 2 front support arms - Lasersafe system - Side safety doors - Die shifting

Year of construction: 1991, condition: good (used), machine/vehicle number: 166, Offer 22014 Technical data: - max. working width 4080 mm - max. cutting capacity St 40 6 mm - hydr. cutting angle adjustment - man. Cutting gap adjustment Lodpfxsh N U Hps Ab Uehn - stroke rate depending on cutting angle and cutting length approx. 20 - 25 per/min - backgauge with positioning control ELGO 10 - 1000 mm - Cutting length adjustment - 17 pcs. hydraulic hold-downs - front angle stop - front support arms - drive 400 V / 9 kW - foot switch - Space requirement without support arms approx. W 4450 x H 1900 x D 2300 mm - weight approx. 10500 kg

Condition: good (used), functionality: fully functional, Year of construction: 2006, Pressure: 50 t Bending length: 1275 mm Distance between uprights: 1040 mm Stroke: 215 mm Usable installation height: 385 mm Throat depth: 420 mm Total power requirement: 10 kVA Machine weight approx.: 4,900 kg Machine dimensions: 2200x2000x2400 mm Accessories/Equipment: - 2 support arms in front of the machine - 2 backgauge fingers - Foot switch Lodpfx Absxb Siqo Uohn - Light barrier in front of the machine - Trumpf Tasc 6000 control - Wila tool clamping system - Controlled axes: y1, y2, x, R, z1, z2 - Die displacement

Condition: good (used), functionality: fully functional, Year of construction: 2007, Bending length: 3050 mm Distance between uprights: 2550 mm Press force: 170 t Stroke: 445 mm Machine weight approx.: 12,200 kg Equipment: – 2 front support arms – Light barrier in front of the machine – Foot switch – Wila clamping system top and bottom – TASC 6000 control – Die shifting – Incl. tooling – Crowning – 6-axis backgauge – Hydraulic run time: 26,452 h – Machine run time: 42,812 h Lhjdpfx Aexb Sd Isb Usn