Used Schaudt / Serwema Cylindrical Grinding Machine for sale (65,155)

Condition: as good as new (ex-display), Year of construction: 2020, operating hours: 200 h, functionality: fully functional, workpiece weight (max.): 150 kg, grinding length: 500 mm, grinding wheel diameter: 455 mm, grinding diameter: 300 mm, workpiece weight between centers: 1,50,000 g, type of input current: three-phase, workpiece diameter between centers: 500 mm, grinding wheel width: 75 mm, spindle speed (max.): 500 rpm, spindle speed (min.): 10 rpm, grinding spindle motor power: 7,500 W, overall weight: 4,600 kg, Demonstration CNC cylindrical grinding machine with automation setup Brand OKAMOTO Model OGM-350 P NCIII Year of manufacture 2020 Control: Fanuc Oi Model D Operating hours: approx. 200 hours Technical specifications Maximum swing diameter: 320 mm Maximum distance between centers: 500 mm Maximum workpiece diameter to be ground: 300 mm Maximum workpiece weight between centers: 150 kg Maximum workpiece weight: flange + chuck + workpiece: 40 kg Grinding wheel: Diameter x width x bore: 455 x 75 x 127 mm Wheel speed: Continuously variable Circumferential speed: 45 m/sec Grinding headstock (x-axis) Maximum travel: 300 Swivel angle: Non-swivel Workpiece table (z-axis) Travel: 870 mm Swivel angle: 0 – 10° Workhead Dcodpfx Ajzn U S Iei Son Fixed/Live Center Design MK 4 Taper Chuck Spindle Bore Diameter 20 mm Spindle Speed ​​10 – 500 rpm Swivel Angle: Non-Swivel Tailstock Tailstock Type: Manual Fine Taper Adjustment Quill Travel 30 mm MK 4 Taper Chuck Drive Power Grinding Wheel Drive 5.5 kW Total Power 20 kVA Dimensions/Weight Length x Width x Height approx. 3400 x 2330 x 1950 mm Machine Weight approx. 4,600 kg Standard Equipment: 2 Carbide Centers Full FANUC Keyboard with Radius Compensation for Creating ISO Programs Workshop Programming: Graphic Software for Grinding and Dressing Cycles with Teach-in Function GAP Eliminator Shoulder Positioning Constant Table coolant flush 3 color LED lamp Documentation Leveling screws and support plates Operating tool set Accessories Automation preparation Automatic door Automation interface Grinding wheel guard fully open when door is open Miscellaneous Signal lamp Tailstock with electric quill retraction 1 flange 1 grinding wheel Options upon request: Paper belt filter on request Clamping devices on request Commissioning and training on request (Commissioning by Okamoto is required for warranty purposes) Transport on request

Condition: used, Tschudin HTG310 Universal Cylindrical Grinder Centre height: 100mm Distance between centres: 340mm (13.4") Maximum grinding diameter: 200mm Maximum grinding length: 340mm Hydraulic table traverse Table swivel: ±11° Wheelhead swivel: ±5° Workhead swivel: 360° Infinitely variable workhead spindle speed: 50–500 RPM Automatic plunge and traverse grinding cycles Automatic infeed with adjustable spark-out timer Rapid wheelhead advance and retract Hydrodynamic wheelhead bearings for exceptional accuracy Grinding wheel size: 350 x 50 x 127mm (14" x 2" x 5") Dcsdpfxozrt Ipo Ai Sjn Fitted With Hydraulic table drive Universal workhead Tailstock Coolant system Wheel guard Machine lighting

Condition: used, Year of construction: 2017, grinding length 1500 mm centre height 180 mm weight of the machine ca. 3,9 t dimensions of the machine ca. L: 4900 x 1650x 1800 m Dcedpfx Aowm Rqgji Ssn

Condition: used, Cylindrical Grinding Machine TSCHUDIN type HTG 400 Between points: 400 mm Centre height: 100 mm Cone: CM4 Spindle speed: from 70 to 500 RPM Max table travel: 420 mm Table orientation at 15° Grinding wheel: Ø 300 mm Dcedpfx Ajz I Aw Noi Son Retractable tailstock CM3 Machine rebuilt by REWITECH SA (Switzerland) in 1995 Equipped with one settling tank PHILIPS Voltage: 380 V Dimensions (L x W x H): 2000 x 1400 x 1600 mm Weight: approx 1,5 T

Year of construction: 2008, condition: used, functionality: fully functional, machine/vehicle number: TTS10371, Our TT8500 is in very good condition and fully functional. It is equipped with an EPSON manipulator and is very well suited for pre-grinding operations such as with step drills, necking, relief grinding, chamfers, etc. The centerless processing also offers special advantages, especially regarding the concentricity of the tools to be produced. Dcedpfxow H Sguo Ai Sen

Condition: as good as new (ex-display), Year of construction: 2024, functionality: fully functional, Working area Grinding length: 250 mm Centre height: 100 mm Workpiece weight: 30 kg Z-axis: 350 mm Djdpfx Aievz Snko Secn Table adjustment: 8 ° degrees X-axis: 190 mm Grinding spindle Grinding wheel diameter max.: 500 mm Grinding wheel width max.: 80 mm Grinding wheel bore: 127 (203) Grinding wheel motor power: 5.5 kW Peripheral speed: 50 m/s Grinding wheel protection cover: D500 x 80mm Workpiece spindle Speed: 1 - 2,000 rpm Workpiece spindle mount: MK4 Tailstock Tailstock quill mount: MK3 Tailstock quill stroke length: 30 mm Cylinder fine adjustment range: ± 0.04 Equipment Paper belt filter system Rinse gun Mechanical fume extraction

Condition: good (used), functionality: fully functional, Used Kellenberger cylindrical grinding machine for sale in very good condition. Price significantly reduced !!!!! Dcodpfx Aew Dzbdei Sen

Condition: excellent (used), Year of construction: 2011, functionality: fully functional, machine/vehicle number: 632054, There are several machines of the same type/process available. Loading varies – both gantry and robot systems are used. --- (Please provide us with your offer price.) Sales only within Europe, including Turkey. Price excludes packaging; delivery condition: FCA (machine location). ===== Technical data can be found in the attached handout. Any warranty claims are excluded. We do not guarantee the accuracy of the technical data and year of manufacture, the completeness of accessories and tool equipment, or compliance with all safety and environmental protection requirements mentioned in the accident prevention regulations. No sales to private individuals. Dcedpfx Aiezfwnas Ssn

Condition: used, Technical details: grinding diameter: 600 mm grinding length: 2600 mm centre height: 180 mm workpiece diameter - max.: 360 mm swing diameter: 600 mm grinding wheel diameter: 600 x 305 x 160 mm total power requirement: 17,6 kW Dcsdpfew Rktbox Ai Sen coolant device: 90 l/min work piece spindle speed: 12,5-250 U/min feed continuous: 0,05 - 6,0 mm weight of the machine ca.: 8,2 t dimension machine xH: 6,4 x 2,2 x 1,9 mm Final balance balancing device Tailstock with cylinder error correction Digital display X=0.001 - Z=0.01 Radius device 2-10 mm *

Condition: excellent (used), functionality: fully functional, center height: 125 mm, grinding length: 600 mm, grinding diameter: 249 mm, control cabinet length: 1,200 mm, control cabinet width: 40 mm, grinding spindle speed: 1,530 rpm, control cabinet height: 1,500 mm, overall weight: 3,250 kg, For sale is a cylindrical grinding machine manufactured by Kellenberger. The machine is in very good condition. Make: Kellenberger Model: R 125x600 Technical Specifications: Centre distance: 600 mm Centre height: 125 mm Workpiece diameter: 249 mm Power requirement: 10 kW Table: Travel: 700 mm Travel per handwheel turn, coarse/fine: 20/2.5 mm Speed, hydraulically adjustable: 0.02–6 m/min Minimum reversing travel: 1.5 mm Dwell time at reversal, adjustable: 0–5 sec Swivel range: 11 degrees Cross slide: Travel with feed handwheel, coarse/fine: 220 mm Travel per handwheel turn, coarse/fine: 4/0.5 mm Rapid traverse and return, hydraulic: 50 mm Feed, electro-mechanical with stepper motor: 0–9.99 mm/Ø Micro-stop of feed, per graduation: 1 µm/Ø Plunge grinding: Feed rate coarse/fine: 1–49/0.2–2.8 µm/sec Grinding spindle head: Dcodpsyyn Ehofx Ai Ssn Grinding wheel, diameter x width x bore: 500 x 80 x 203.2 mm Motor rating: 5.5 kW Grinding spindle speeds: 1220, 1360, 1530 rpm Workpiece spindle head: Swivel range: 360 degrees Speeds, steplessly adjustable: 20–400 rpm Spindle internal taper: Morse 5 Motor rating: 0.9 kW Tailstock: Quill internal taper: Morse 3 Quill travel: 30 mm Machine dimensions: 2800 x 1850 mm Weight: approx. 3000 kg

Condition: ready for operation (used), Workpiece diameter with/without steady rest: 400mm/250mm, max. workpiece length: 750mm, spindle head load: 400kg, max. internal grinding diameter: 350mm, max. grinding depth: 500mm, travel X/Z: 300mm/1000mm, max. traverse speed: 15m/min, control system: Siemens Sinumerik. Documentation available. On-site inspection is possible. Dcedpox Uq T Dofx Ai Son

Condition: used, Year of construction: 1989, grinding diameter 280 mm grinding length 630 mm centre height 145 mm weight of the machine ca. 2,3 t dimensions of the machine ca. 2,90x1,65x1,50 m TOS Hostivar BUAJ 28/630 – robust conventional universal cylindrical grinding machine The machine is a conventional universal cylindrical grinding machine designed for precision grinding of cylindrical and conical workpieces. The BUAJ series is known for its robust construction and suitability for demanding industrial grinding applications. Dcjdpfxez Hqapj Ai Sen Technical specifications - Manufacturer: TOS Hostivar - Model: BUAJ 28/630 - Year of manufacture: 1989 - Machine type: Universal cylindrical grinding machine / centre-type cylindricalgrinder - Control: Conventional, non-CNC - Max. grinding diameter: 280 mm - Max. grinding length: 630 mm - Distance between centres: 630 mm - Max. workpiece weight between centres: approx. 70 kg - Centre height: approx. 145 mm - Workhead speed range: approx. 22.4–710 rpm - Grinding wheel: approx. Ø 400 × 50 mm - Main drive power: approx. 9.3 kW - Machine dimensions (L × W × H): approx. 2,900 × 1,650 × 1,500 mm - Machine weight: approx. 2,300 kg - incl. manuals

Condition: ready for operation (used), Year of construction: 1962, functionality: fully functional, overall weight: 1,050 kg, input voltage: 380 V, type of input current: three-phase, For sale: VEB Schleifmaschinenwerk Berlin / WMW SI 40×70 cylindrical grinding machine, manufactured in 1962, serial number 1334/62, Made in Germany. The machine is complete and in working condition. The machine can be inspected and tested on-site before purchase. WMW / VEB Schleifmaschinenwerk Berlin is known for its robust industrial grinding machines designed for heavy-duty workshop and production applications. Technical data: Manufacturer: WMW / VEB Schleifmaschinenwerk Berlin Type: SI 40×70 Serial number: 1334/62 Year of manufacture: 1962 Country of manufacture: Germany Total weight: approx. 1,050 kg Electrical diagram: SI 40-007 Wiring diagram: SI 40-008 Power supply: 3-phase AC Frequency: 50 Hz Operating voltage: 380 V Control voltage: 220 V Dcjdpfsznvqlsx Ai Sjn Condition: Used, operational condition. Inspection and test run are possible before purchase. Transport: Transport can be arranged throughout Poland after prior agreement. Sales document: VAT invoice or receipt available. Contact: Please contact us to arrange inspection, collection, or transport.

Condition: used, Center height: 180mm, distance between centers: 1000mm, max. grinding diameter: 355mm, stop accuracy: 1µm, max. workpiece weight: 500kg, max. workpiece weight when machining in the chuck: 120kg, max. workhead spindle speed: 355rpm, workhead spindle power: 1.5kW, Morse taper: MK5, workhead swivel range toward the grinding wheel/away from the grinding wheel: 90°/10°, quill travel: 40mm, table feed during longitudinal grinding: 0.05m/min-5m/min, travel during longitudinal grinding: 4mm-2180mm, dwell time at reversal point: 0s-5s, max. grinding spindle speed: 1860rpm, grinding wheel dimensions diameter/width/bore: 630mm/125mm/305mm. Weight: approx. 5100kg. The machine has been geometrically reconditioned. Documentation available. An on-site inspection is possible. Dcodpezwpg Esfx Ai Sen

Condition: refurbished (used), Year of construction: 2025, operating hours: 50 h, machine/vehicle number: 3018-04, Country of manufacture: Switzerland Voltage: 380/50/3 Net weight: 3100 kg Overall dimensions: 230x155x170 cm Installed power: 13 kVA Customs tariff position: 8460.2920 TECHNICAL SPECIFICATIONS MAIN DIMENSIONS Distance between centers: 650 mm Grinding capacity SpW+bs: -80 Stroke: 700 LONGITUDINAL SLIDE Max stroke: SpW+50 mm Minimum automatic feed: 1.5 mm Speed: 50-5500 mm/min Reversal delay: 0-6 sec Maximum table swivel: 12°/10°/8.5°/6° Pneumatic relief for table and workhead CROSS SLIDE Max stroke: 300 mm Rapid traverse: 60 mm Plunge grinding depth in diameter: 3.4 mm Feed 1: 0.012-6 mm/min Feed 2: 0.012-1.2 mm/min Feed per pulse: 0.001-0.05 mm GRINDING WHEEL HEADSTOCK Left-side wheel, external grinding: 400x80x127 mm Drive power: 5.5 kW Peripheral speed: 35 m/s RPM: 1670/2110 min-1 Internal grinding device for belt-driven spindles, including drive unit: 1.5 kW WORKHEAD Swivel range: 0-90° Continuously variable RPM: 30-1000 min-1 Internal taper: Morse 5 Collets: W-25 Drive power: 0.55 kW Maximum workpiece weight between centers: 130 kg Grinding load between centers: 100 Nm TAILSTOCK Internal taper: Morse 3 Quill stroke: 35 mm Fine adjustment for cylindricity correction: ± 40 μm TECHNICAL CHARACTERISTICS: GUARANTEED WORKING ACCURACY Straightness of the generator over 630 mm: 0.003 mm Roundness during chuck grinding: 0.0003 mm CONNECTION VALUES Maximum absorbed power: 13 kVA Maximum permitted voltage fluctuation: -15%/+10% Maximum permitted frequency variation: ± 3% Required compressed air pressure: 5 bar Unless otherwise stated or in case of error or omission, these technical details are provided without engagement. Dcsdpew T Sd Tofx Ai Son

Condition: as good as new (ex-display), Year of construction: 2026, Karstens K11 650 Premium Retrofit Round Grinding Machine Manufacturer: Karstens Dcjdpfx Aioiv Audo Ssn Technical Specifications: Center distance: 750 mm Center height: 180 mm / (250 mm = Option) Workpiece weight: 100 kg cantilevered, 250 kg between centers Grinding wheel diameter: 400 mm or 500 mm (external grinding wheel) Workpiece spindle: MK 4, speed continuously adjustable 30-450 rpm, swivel range 0 - 90 ° Tailstock: MK4, quill stroke 45 mm, cylindrical correction Quill force: 200-600 N manually, (up to 2500 N possible, adjustable = Option) Table inclination: 12.5 degrees Travel of the feed spindle: 80 mm Rapid traverse: 50 mm Rough adjustment with air cushion: 280 mm Grinding spindle motor, external: 4 kW / (5.5 kW = Option) Continuously adjustable grinding wheel speed with potentiometer Grinding spindle motor, internal: 2.2 kW Workpiece spindle motor: 1.1 kW Hydraulic motor: 1.5 kW Lubrication motor: 0.1 kW Hydraulic tank: 80 liters Machine weight: Net 3500 kg Feed drive via DC motor Air cushion-supported rapid adjustment of the grinding spindle head for quick and safe positioning to the grinding location. Separate drive for the spindles for external and internal grinding. Fully automatic operating sequence, feed movement via wind rose switch: Rapid traverse forward, rapid traverse backward, grinding operation, feed stop, incremental feed. Automatic longitudinal grinding cycle Central coolant supply for all grinding points Workpiece spindle head with continuously adjustable drive with a co-rotating and lockable spindle. Feed control, digital with Siemens panel and Siemens PLC for longitudinal grinding and plunge grinding, input for retraction, feed increments, feeds, dwell times, idle strokes, compatible with the old Karstens feed control, with color Siemens touch panel Scale in X and Z axes, manufacturer HEIDENHAIN. Similar to Weiss / EMAG / GP round grinding machines / Studer / Kellenberger / Schaudt / Tschudin / Tacchella / Dannobat / Bahmüller / Fortuna.

Condition: excellent (used), Center height 300 mm Distance between centers 3500 mm Grinding wheel 760 x 305 x 100 mm With DRO With measuring control MARPOSS Misc.accessories Dcodpjtpgnhefx Ai Ssn MARCELS MASCHINEN AG

Year of construction: 2014, condition: ready for operation (used), A Karstens cylindrical grinding machine from 1992, which was completely overhauled and modernized in 2014, is available. Center width: 1000mm, center height: 180mm, grinding diameter: 360mm, max. workpiece weight center/flying: 250kg/70kg, grinding wheel diameter: 400mm. Spindle holder: MK4, speed: 450rpm, swivel range: 90°, quill holder: MK4, quill stroke: 45mm, quill force: 600N. Table swivel: 10°, infeed spindle: 80mm, rapid traverse: 50mm, coarse adjustment: 280mm, weight: approx. 3800kg. Including 3x centering points and grinding wheels as good as new. Documentation available. On-site inspection is possible. Dsdpfx Aov Suftoi Sscn

Condition: ready for operation (used), Year of construction: 2012, functionality: fully functional, machine/vehicle number: 155847, Round grinding machine Knuth RSM 1000, year of manufacture 2012, fully functional, with internal grinding attachment. Condition: fully functional Year of manufacture: 2012 Location: West Saxony Price: on request Technical data: Dsdozyltmepfx Ai Socn Manufacturer: Knuth Werkzeugmaschinen GmbH Type: RSM 1000 Serial number: 155847 Power: 9.5 kW Grinding length: 1,000 mm Grinding diameter: up to 320 mm Center height: 180 mm Dimensions: L 3,600 × W 1,650 × H 1,800 mm Machine weight: approx. 3.7 t Equipment: Digital 2-axis position display (DRO) Internal grinding attachment (standard) Steady rest (standard equipment) Central lubrication system Coolant system Description: For sale is a Knuth RSM 1000 round grinding machine, manufactured in 2012, with a digital 2-axis position display. With a grinding length of 1,000 mm and a grinding diameter of up to 320 mm, the machine is suitable for both single-part machining and small-batch production. It comes standard with an internal grinding attachment and a steady rest for machining long workpieces. The machine is fully functional. Inspection and test run possible at the location in West Saxony by appointment. Price: on request Other machines available from site liquidation Takeover of the location negotiable.

Condition: used, Year of construction: 2017, controller manufacturer: Siemens, controller model: 840 Dsl, _____ Description: Year of manuf. : 2017 Control : Siemens 840 Dsl Grinding length : 1000 mm In General: Year of manufacture:2017 Control system:Siemens 840 Dsl Centre height:180 mm Centre distance:1,000 mm Maximum workpiece weight:150 kg X-Axis: Technology:Electromechanical Transverse speed:0.001 – 8,000 mm/min Measuring system:Direct, 0.0005 mm (glass scale) Guideway:Hydrostatic Z-Axis: Technology:Electromechanical Table speed:0.01 – 12,000 mm/min Measuring system:Direct, 0.0005 mm (glass scale) B-Axis: Technology:Continuously swivelling axis Resolution:0.001° Clamping:Hydropneumatic Workpiece spindle: Power:2.0 kW Speed:0–600 rpm Chuck:MK 5 and KK 5 C-axis:0.001° Grinding spindle: Disc configuration:left/right Power:9 kW Speed:1,400 rpm Internal grinding spindle: Power:2.2 kW Speed:60,000 rpm Tail stock: Quill stroke:40 mm Mounting:MK 4 Quill retraction:Hydraulic Cylinder fine adjustment:Yes Equipment: Coolant supply:Coolant system with filter Emulsion mist separator:Mechanical Grinding wheel dresser:Diamond dressing tile Technology option I:Cone grinding Technology option II:Out-of-round grinding Balancing system:Automatic Grinding detection:Via structure-borne sound Workpiece measurement:Linear encoder Accessories:Various flanges, discs and mandrels Dcsdpezhdybjfx Ai Sjn

Condition: refurbished (used), Year of construction: 1992, machine/vehicle number: 92 0 20 10 19 031, total width: 1,900 mm, total length: 4,000 mm, total height: 2,000 mm, distance between centers: 1,200 mm, spindle speed (max.): 1,600 rpm, grinding spindle speed: 1,600 rpm, overall weight: 1,900 kg, input voltage: 380 V, We are offering this refurbished Karstens K19-1000 cylindrical grinding machine, manufactured in 1992. Voltage: 380 V Rated current: 48 A Inrush current: 126 A Dcodpfxoz Dalis Ai Ssn Fuse in the supply line: 35 A Control current: 2.5 A Machine weight: 1.9 t If you have any questions or require further information, please do not hesitate to send us a message or call us.

Condition: refurbished (used), Year of construction: 2007, functionality: fully functional, machine/vehicle number: 027.0400/067, CNC CYLINDRICAL GRINDER STUDER S-33 CNC Year: 2007 - Fanuc 21i-TB 1 External Grinding Spindle Country of Origin: Switzerland Voltage: 380/50/3 Net machine weight: 4,000 kg TECHNICAL SPECIFICATIONS Distance between centers: 600 mm Center height: 175 mm Maximum workpiece weight: 80 kg Longitudinal Slide Z Max. travel: 800 – 1,150 mm Travel speed: 0.001 to 10,000 mm/min (early 2000’s model: 0.001-5,000 mm/min) Resolution: 0.0001 mm Cross Slide X Max. travel: 285 mm Travel speed: 0.001 to 20,000 mm/min (early 2000’s model: 0.001-10,000 mm/min) Resolution: 0.0001 mm Wheelhead (universal version) Swiveling range: -15° to 225° (early 2000’s model: -15° to 195°) Swivel axis: 2.5 / 1 ° Hirth Drive power: 7.5 or 9 kW or 11 kW Grinding wheel: 500x63 (80/110F5) x203 mm Workhead Rotational speed: 1 – 1,500 min-1 Mount taper: MT4 or MT5 / ISO 50 Drive power: 1.6 or 3.0 or 4.0 kW Tailstock Dodpfow T Sh Eex Ai Socn Mount taper: MT3 or MT4 Quill stroke: 35 / 50 mm (early 2000’s model: 35 mm) Quill diameter: Ø 50 mm Fine adjustment: +/- 40 µm Control system: Fanuc 21i-TB All technical details are provided in good faith but subject to errors or omissions.

Condition: good (used), Studer S30-12 cylindrical grinding machine TECHNICAL DATA Main dimensions Center height: 125 mm Center width: 400 / 700 / 1025 mm Largest longitudinal slide path: 400 / 700 / 1000 mm Longitudinal slide Table speed: 50 - 5000 mm/min Reversing delay: 0-6 s Smallest automatic travel: 1.5 mm Max. stroke: 400 / 700 / 1020 mm Max. Table inclination: 12 / 30 / 78° Cross slide Swivel range: +- 45° Quick adjustment: 40 mm Feed path with handwheel: 20 mm Largest plunge depth: 1.7 mm Sanding headstock Djdpfx Aiovca Izs Sscn Grinding wheel diameter x width x bore: 450 x 80 x 203 mm Speed: 1340 / 1500 1625 / 1800 / 2000 / 2200 rpm Coarse adjustment: 210 mm Workpiece headstock Swivel range: 0 - 90 Speed range: 30 - 675 rpm Mounting cone: Morse 5 Collets: W25 Tailstock Mounting cone: Morse 3 Adjustment travel of the center: 30 mm Total power requirement: 5 / 8.25 kW No liability is assumed for the correctness, completeness and up-to-dateness of the information.

Condition: used, Year of construction: 2010, We offer you: 2 units of CNC cylindrical grinding machines Dcsdpfxozrl E He Ai Sen Manufacturer: Junker Type: Jumat 3000/50S Year of manufacture: 2010 Control system: Siemens You can find the technical specifications in the images. Accessories, tools and clamping devices shown in the images are only included in the scope of delivery if this is explicitly stated in the additional information. Subject to changes and errors in the technical data and information, as well as prior sale!

Condition: used, functionality: fully functional, Kellenberger cylindrical grinding machine in very good condition. Available at a favorable price. Price significantly reduced !!!!! Dcjdpfsw Dy Rqox Ai Ssn