Used Feed Machine for sale (65,764)

Condition: used, Year of construction: 2008, functionality: fully functional, machine/vehicle number: 100708, feed length X-axis: 6,300 mm, feed length Y-axis: 250 mm, feed length Z-axis: 200 mm, overall weight: 2,500 kg, saw blade diameter: 700 mm, input voltage: 400 V, saw blade bore: 30 mm, We offer this used H&M HM-Z Automatic Through-Feed Machine, year of manufacture 2008. Hedoy H Dblepfx Al Isl Machine: HM-Z Type: 4-F Serial number: 100708 Production date: 15-04-2008 Connection voltage: 400 V Power: 19 kW Weight: 2500 kg Air pressure: 6-10 bar Maximum saw blade diameter: 700 mm Minimum saw blade diameter: 600 mm Saw shaft hole diameter: 30 mm Maximum milling cutter diameter: 400 mm Minimum milling cutter diameter: 300 mm Cutter shaft hole diameter: 60 mm Completely overhauled in 2024 by Diba Machinehandel and has hardly been used since, due to an additional business activity. Must go due to lack of space. Infeed section adapted to a working length of 7 meters during the 2024 overhaul. H&M crosscut saw: approx. 19.5 x 4 meters Price is exclusive of dismantling, transport, assembly and accessories, valves, pipes, extraction hoses, and power cables. If you have any questions or would like more information, please feel free to send us a message or call us.

Condition: new, Shaft diameter: 120roll diameter: 390motor power: 15length: 2000width: 1650heigth: 1900weight approx.: 4450 Standard Equipment • Steel construction frame • 3 rolls powered by hydromotor and planetary gearbox • Horizontal and vertical working position • Mobile control panel • Hardened standard rolls • Hardened and ground shafts made of high-tensile special steel • Digital read-outs (2 pcs) • 3-axis hydraulic lateral angle guide rolls • Two-speed working system • Hydraulic elements: Duplomatic (Italy) components used • Electrical equipment: Siemens (Germany) or Telemecanique (France) • Built according to EC safety directives (CE mark) and ISO 9000 certificate • User’s manual in English Options: - NC Unit 7 Screen EURO 7.500,-- Capacity Chart: NoProfile TypeSize Max Min. es1125x25 1200 Standard Rolls2200x50 1000 Standard Rolls365x65 750 Standard Rolls4Ø80 850 Optional Rolls5Ø5”x6,35 1500 Optional Rolls6Ø160x4 2800 Optional Rolls7120x40x4 1800 Optional Rolls890x5 1800 Optional Rolls9120x120x12 1200 Optional Rolls 10100x100x10 1200 Optional Rolls 11100x11 800 Standard Rolls12100x11 1000 Standard Rolls13100x11 800 Optional Rolls14UPN 220 Hsdpjy Hymqofx Al Iol 1000Standard Rolls*15UPN 220 1200 Standard Rolls*16IPN 220 1000 Standard Rolls *17HEB 120HEA 14012001200Standard Rolls *18UPN 120 10000 Optional Rolls 19IPN 160 5000 Optional Rolls 20HEB 100HEA 12016004000Optional Rolls

Condition: used, Single-Column Eccentric Press RASTER ZEULENRODA Type PDA 100 Year of manufacture: 1995 Pressing force: 100 tons Throat depth: approx. 360 mm Table size: 1200 x 710 mm Ram area: 900 x 500 mm Table opening: 400 x 120 mm Stroke adjustment: 6 to 82 mm Ram adjustment: 100 mm Installation height, max. stroke, ram Top Dead Center (TDC): max. 469 mm Installation height, max. stroke, ram Bottom Dead Center (BDC): max. 387 mm Strokes per minute: 50-200 s.p.m. Main drive motor power: 18.5 kW Power supply: 400 Volt, 50 Hz - Hydraulically actuated multiple-disc wet clutch and spring-loaded safety brake - Infinitely variable drive via PIV gearbox with inching mode for automatic stroke adjustment and setup operations - Hydraulic overload protection in the ram - Press force and process monitoring via UNIDOR APS - Pneumatic, steplessly adjustable ram weight compensation - Roller feeder MABU WE16, 160 x 3 mm, programmable feed length - Central grease lubrication - Operating manual and documentation for the press Included: Roller feed unit MABU Type WE16 Strip width: 160 mm Strip thickness: max. 3 mm Strip cross-section: max. 300 mm² Roller diameter: 63 mm Hedpfxjx U Eiaj Al Iol Strip speed: 40 m/min - Adjacent feeder control MABU Space requirements for eccentric press L x W x H: 270 x 240 x 350 cm Weight of the press: 13.5 tons

Condition: new, Shaft diameter: 180Upper Roll Diameter: 60Bottom Roll Diameter: 50working speed: 5motor power: 3length: 1200width: 850heigth: 1200weight approx.: 1000 Technical specifications: - Steel construction welded frame - 3 Rolls are powered - Hardened and ground shafts made of high tensile special steel - Rolls are hardened and ground - Horizontal and vertical working position - Hardened standard rolls - Mobile control panel - 3 Axis mechanical lateral angle guide rolls - Brake motor equipped for the precision bending - Digital Read-Outs (2pcs) Options: - Digital Readout STANDARD - NC Unit 7 Screen EURO 9.000,--                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   HPK 50 file TypeSizeMin. DiaNotes160x10         20x10600         300Standard Rolls2100x15         50x10600         300Standard Rolls335x35         15x15600         300Standard Rolls4Ø 35         Ø 20600         300Optional Rolls5Ø 70x2         Ø 25x1,51200         400Optional Rolls62”x2,9         1/2”x2,31000 Hsdpfod Ab H Nsx Al Isl         300Optional Rolls770x30x3         30x15x21500         400Optional Rolls8 50x3         20x21600         400Optional Rolls950x50x6         30x30x3600         400Optional Rolls1050x50x6         30x30x3900         600Optional Rolls1160x7         30x4600         400Standard Rolls1260x7         30x4700         400Standard Rolls1360x7         30x4700         400Standard Rolls14UPN 80         UPN 30800         400Optional Rolls*15UPN 80         UPN 301200         600Standard Rolls*         * Special washer (spacer) can be necessary / Only with special Beam Bending Attachment         •Capacities are given for 260 N/mm² plate yielding strength          

Condition: used, Year of construction: 1995, functionality: fully functional, For sale: Hundegger P10 machine, in continuous use. The machine was purchased used, directly from the manufacturer in Germany. Ready for further operation. Possibility to inspect the machine live during operation. Hodpfx Alexlla Do Isl

Condition: used, Single-column eccentric press EBU Type 75 SKU Machine no. No. P 4598462 Year of construction 1962 Compressive force 75 ton. throat depth 300 mm Table surface 800 x 620 mm waste hole 325 x 225 mm Plunger surface 470 x 180 mm Clamping pin bore Ø 40 mm Hjdpfsdzqltox Al Ijl Table height above floor 845 mm Stroke adjustment 16 - 140 mm Plunger adjustment 80 mm Installation height max. approx. 420 mm Stroke rate 60 + 105 strokes/min. Motor power 4 kW Mains connection 380 Volt, 50 Hz. - Pneumatic clutch/brake combination EBU - Overload protection with breaker plate in ram - UNIDOR tool monitoring system, type APS MINI - mechanically driven gripper feed with belt straightener OSTERKAMP, type ZPN 200/350 - strip width: 200 mm, feed length: max. 350 mm - Strip thickness: max. 3 mm or approx. 200 x 1.5 mm - 2 speeds due to 2 V-belt stages on the wheel transmission - Two-handed operation - Simple work area shielding for swinging open - Table height adjustment in lowest position = threaded spindles for adjustment 50 mm below floor level - Control cabinet and control panel for tool monitoring adjacent - Automatic central lubrication - 4 machine feet Space requirement L x W x H 2600 x 2300 x 2450 mm Weight approx. 5.5 tons good condition

Condition: new, Year of construction: 2021, Linishing machine for flat parts or rectangular tubes. Working capacity (mm) 120x120 Abrasive belt speed (m/s) 20 Abrasive belts (mm) 120x1850 Conveyor belt speed (m/min) 12 or 6+12 Abrasive belt motor (kW) 3 Consumption (A) 7 Dimensions approx. (mm) 975x880x1800 Weight approx. (kg) 350 Hodpfxsg R Sxve Al Iel

Condition: ready for operation (used), Year of construction: 1981, functionality: fully functional, machine/vehicle number: 8109/30, Drilling and Dowel Inserting Machine with PLC + Part Return | 8 heads For sale: a professional through-feed drilling and dowel inserting machine for the production of furniture components, particularly drawer sides. The machine is equipped with PLC control, automatic part return, and an expanded head arrangement (including rear heads), enabling the complete operation to be performed in a single pass—without re-feeding the workpiece. Hedpoyzg Udofx Al Iol Technical Specifications: - Number of heads/motors: 8 - Head configuration: front/side/rear (double-sided machining in a single cycle) - Control: PLC - Part return: yes (closed production loop) - Maximum working width: 2000 mm - Power supply: 400 V - Pneumatics: yes - Year of manufacture: 1981 - Manufacturer: Gerhard Koch (Germany) - Condition: operational, in ongoing serial production Performance: Approx. 6,000 drawer sides per 8-hour shift Thanks to the rear heads, components that typically require two passes are processed in one, significantly reducing cycle times and increasing productivity. Applications: - Drawer sides - Cabinet components - Batch and repeat production - Automated production lines Key advantages: - Single pass processing instead of two - High repeatability - Stable, heavy-duty construction - Perfect for mass production - Proven German technology Location: Elbląg Please contact me for further information.

Condition: new, functionality: fully functional, Year of construction: 2025, coil width: 200 mm, product width (max.): 200 mm, overall weight: 80 kg, warranty duration: 12 months, working width: 200 mm, product height (max.): 3 mm, roll width: 64 mm, Silicon+ SFS 200 Servo Roll Feeder Compatible with all kind of presses, primarily used on Bruderer, Schaal and Mabu machines. Feeding length – min 0.10 mm to max. 9999.99 mm Feeding width – max. 100 mm, 200 mm or 300 mm. Depending of model required. Hsdpjvptz Iefx Al Isl Material thickness – 0.20 – 3.20 mm Feeding angle – 180° Die line height – ± 50 mm Max. feeding speed – 20 m/minute Strip release – Festo pneumatics Control – NC Touch screen Servo brushless motor – 0.75 KW, 1.8 KW or 2.3 KW. Weight approx. feeder: 80-150 kg. Feeder dimensions: 780 X 730 X 680 mm – The unit is driven by the brushless servo motor, with direct drive transmission, eliminate the gear clearance, abrasion, no noise, no lubrication, safely to a synchronized pair of roller segments. – Rolls can be made upon request with PU surface for delicate raw material feeding. – Synchronization of the feeder and punching machine is done easy through cam signal from PLC of a punching machine. – Programmable feeding can be done for up to 10 groups of feeding pitches and saved as recipes. The feed length can be steplessly adjusted during operation EUR 1 certificate of European origin and CE compliance. This information is subject to change without notice, we can make personalized feeders for your needs with prior agreement.

Condition: new, Year of construction: 2015, Factory-new machine, has only been used for test runs, condition is as new. TECHNICAL DESCRIPTION The DIGIT MAGGI throughfeed drilling machine is an automatic multi-spindle throughfeed drilling machine equipped with 2 horizontal heads and 6 vertical heads, designed for high-volume production. TECHNICAL SPECIFICATIONS Number of horizontal heads: 2 Number of vertical heads: 6 Minimum distance between vertical heads: 165 mm Minimum distance between horizontal heads: 320 mm Distance between spindles: 32 mm Number of spindles in horizontal head (left red - right black): 23 (11 - 12) Number of spindles in vertical head (left red - right black): 11 (5 - 6) Maximum vertical drilling depth: 55 mm Maximum horizontal drilling depth: 65 mm Maximum workpiece dimensions: 2800 x 870 x 50 mm Minimum workpiece dimensions: 250 x 150 x 12 mm Number of motors: 12 Horizontal head motor power: 2 HP (1.5 kW) Vertical head motor power: 1.5 HP (1.1 kW) Number of clamps: 10 Loader feed speed: 57 m/min Working air pressure: 6–8 bar Standard air consumption: 60 l/cycle Maximum clamp height above worktable: 75 mm Overall dimensions: 4150 x 1600 x 1800 mm Worktable height: 950 mm Hsdoxd Ruwspfx Al Iel Packaging dimensions: 4300 x 1950 x height 1900 mm

Condition: excellent (used), Sorting, feeding and capping machine Cap application and screwing station without filling station Fully automatic filling and capping system by feeding a filling unit with filling needle Cap sorter and capper for lids and caps up to Ø 20 mm Mode of operation When the machine is started, the caps and lids aligned in the sorter are fed under the capping and screwing heads using a feed system. Cappers include screw cappers for screw caps and lid pushers for stoppers and caps 3 x spiral feed bowls for bottles, stoppers and caps 1 x capping station 1 x cap placement station Container height 55 mm Hedpeqazcgefx Al Iol Container diameter 20 mm Cap diameter 20 mm Financing through our bank is also possible. komplett-konzept.leasingo.de Further items in other sizes - new and used - can be found in our store! International shipping costs on request!

Condition: used, Technical details: plate width: 1000 mm plate thickness: 3,0 mm smallest sheet thickness: 0,5 mm distance between columns: 920 mm Number of Straightening rolls: oben 4x unten 4x Stück / pieces roll diameter: ca. 75 mm number of rollers: 2 oben und 2 unten St. weight of the machine ca.: 6,5 t dimensions L x W x H: 3,8 x 2,2 x 2,1 m This is a sheet metal straightening machine with hydraulic feed. Further features: 4 straightening top rolls Ø 75 x 830 mm, stroke 20 mm, hydraulic Hodpjvgbgasfx Al Isl 4 straightening bottom rolls Ø 75 x 830 mm, fixed, hydraulic 4 pull-out rollers Ø 110 x 480 mm, 2x top adjustable approx. 20 mm and 2x bottom, hydraulic Roller support Infeed height 1400 mm Hydraulic system equipment Operated externally Recommendation: complete conveyor system (decoiler + loading device + straightener with hydraulic feed) for sale with optional stock no. 0100572. *

Condition: excellent (used), 6 drilling units with two heads two side heads spindles span 32mm max material length 2250mm magazine feeding Hodsyxcwvepfx Al Iel manual regulation of units span rotated heads pneumatic top pressure drilling depth regulation

Condition: reconditioned (used), Ribbon mixer Machine has been overhauled Capacity: liters Motor power: 3kW, 23 rpm Material: Steel Hjdpfxjwygclj Al Ijl

Year of construction: 2021, condition: like new (used), Stick handling Biocone -> Stick I/O feed machine Manufacturer Biocone Year of purchase 2022 Separate conveyors for in and out (outfeed bagging features) Main layout attached in operation for less than one year Hodpexmk S Ijfx Al Ijl

Condition: new, Shaft diameter: 580working speed: 3-6motor power: 30length: 2760width: 2310heigth: 2680weight approx.: 14400 Technical specifications: Welded steel construction frame 3 rollers are driven Hardened and ground shafts made of high-strength special steel Rollers are hardened and ground Horizontal and vertical working position Hardened standard rollers Mobile control panel Angular side guide rollers Brake motor equipped for precision bending Digital displays (2 pieces) Hjdpfxsh Alh Hj Al Iel Options: Digital display STANDARD NC unit 10 screen EURO 11,500.00

Condition: used, Automatic Hacksaw SILISTRA / BULMAK Type OH 254 Hacksaw with material feed Machine No. 862919 Year of manufacture: 1986 Cutting capacity - Round Ø 250 mm Cutting capacity - Square 250 x 250 mm Stroke rates 40 - 50 - 63 - 80 - 100 - 125 strokes/min. Saw blade length 450 mm Motor power 1.5 and 2.2 kW, pole-switchable Electrical connection 380 Volt, 50 Hz - Straight cutting automatic machine designed exclusively for 90° cuts - Saw motor with 2 speeds and 3 V-belt stages - Saw bow with hydraulic lowering and lifting - Hydraulic cutting pressure adjustment via throttle valve - Length stop via manually adjustable fixed stop (electrical contact stop) approx. 800 mm - Vise feed with electric feed drive using leadscrew for automatic material transport - Hydraulic material clamping with stepless clamping force adjustment - Coolant unit integrated in machine base - Electrical control cabinet positioned next to the machine Hjdpfxowb Hxvs Al Iol Required floor space (L x W x H): 2000 x 1800 x 1400 mm Weight approx. 900 kg

Condition: excellent (used), Year of construction: 1988, operating hours: 9,807 h, functionality: fully functional, machine/vehicle number: 17483, NOTTMEYER KOMET SUPER S/PN Hedpfjx Af D Rjx Al Isl - very well maintained - fully functional - available immediately

Condition: used, Year of construction: 2021, functionality: fully functional, machine/vehicle number: 1000042683, feed length Y-axis: 1,300 mm, feed length Z-axis: 80 mm, input frequency: 50 Hz, input current: 63 A, total width: 1,950 mm, total length: 1,950 mm, total height: 3,100 mm, The Brema Vektor 15 is a CNC machining center with a vertical column, designed for processing wood-based panels. The machine can perform drilling, milling, and engraving using a pantograph. It allows for machining on all 4 edges of the panel and profiling thanks to its patented panel transportation system. The machine is equipped with: - A head with independent vertical spindles: 21 (7 on X + 14 on Y) - Horizontal spindles (2L + 2R on X) - Main vertical spindle (milling unit) 7.5kW - Automatic revolver-type tool change system, 10 positions Available revolver units: 1. Saw on X Hedpfox Hfh Tox Al Iol 2. Saw on Y 3. Drilling on Y (1R + 1L) 4. Hinge drilling (1x35mm + 2x5mm) 5. Milling 6. Milling 7. Milling

Condition: used, Year of construction: 2001, total length: 13,500 mm, total width: 4,500 mm, Equipment: documentation/manual, type plate available, For sale from the laundry. Complete, working Kannegiesser mangle line (pair). Working width: 3000 mm. Full technical documentation. Composition: 1. EMD feeder - universal, manual and automatic feeding, 2 feeder paw stations, stretching brushes and arms for lifting heavy elements. Hjdjv Nbxnopfx Al Iel 2. HPM double-shaft mangle - 2 x Ø1200 mm shaft, stainless steel basin, good mangle quality. Additional option for gastronomy. 3. RFM reversible folder - precise folding with 2 longitudinal and 3 transverse folds, with an additional track for smaller elements. Stacker Year of production: end of 2001 Technical condition: as after taking over from the laundry, efficient, in use until the end of February 2025, regularly maintained. Required space: approx. 13 m × 4.5 m, Required power 39 kW Why is it worth it? - Kannegiesser brand – leader in the laundry ironing industry. - Easy availability of service and parts: service also in Poland. - High efficiency and precision: ideal for large quantities of flat laundry. - Price-to-capacity and quality ratio. A new one is worth over €400,000. Starting price: €69,900 net Do you have any questions? Do you want to know more? Contact us – we will be happy to provide additional information and send you technical details.

Condition: new, Shaft diameter: 60Upper Roll Diameter: 215Bottom Roll Diameter: 215high performance hydraulic: 16working speed: 4motor power: 1,5length: 1000width: 1400heigth: 1650weight approx.: 950 Technical specifications: - Steel welded construction frame - 3 Rolls are motor driven - Hardened shafts from special steel material Hodpfx Aed Ab H Rol Iel - Top roll hydraulic moveable up-down - Horizontal and vertical working position - Standard rolls - Guide rolls - Brake motor equipped for the precision bending - Mobile control panel Options: - Digital Readout EURO 700,-- - NC Unit EURO 7.000,-- - Angle Lateral Guide Rolls EURO 1.400,--                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   HPK 50 file TypeSizeMin. DiaNotes160x10         20x10600         300Standard Rolls2100x15         50x10600         300Standard Rolls335x35         15x15600         300Standard Rolls4Ø 35         Ø 20600         300Optional Rolls5Ø 70x2         Ø 25x1,51200         400Optional Rolls62”x2,9         1/2”x2,31000         300Optional Rolls770x30x3         30x15x21500         400Optional Rolls8 50x3         20x21600         400Optional Rolls950x50x6         30x30x3600         400Optional Rolls1050x50x6         30x30x3900         600Optional Rolls1160x7         30x4600         400Standard Rolls1260x7         30x4700         400Standard Rolls1360x7         30x4700         400Standard Rolls14UPN 80         UPN 30800         400Optional Rolls*15UPN 80         UPN 301200         600Standard Rolls*         * Special washer (spacer) can be necessary / Only with special Beam Bending Attachment         •Capacities are given for 260 N/mm² plate yielding strength          

Condition: new, Shaft diameter: 30Upper Roll Diameter: 148Bottom Roll Diameter: 118working speed: 2-4motor power: 0,7 - 0,85length: 600width: 800weight approx.: 220heigth: 1450 Technical specifications: - Steel frame - Two bottom rolls are powered - Direct drive power system with gears Hsdpfx Aod Eqq Asl Iel - Top roll is idle ( free turning ) - Hardened rolls - Rolls shafts are special steel material hardened and ground - Double speed motor - Standard rolls - Adjustable guide rolls - Horizontal and vertical working position Options: - digital display EURO 858, -- Angular side guide rollers EURO 1,287, -- Double speed STANDARD Brake motor EURO 150, --                                                                                                                                                                                                                                                                                                                                                                                                                PK 30 file TypeSizeMin. DiaNotes150x10        20x61800        300Standard Rolls280x15        30x6700        400Standard Rolls330x30        10x10900        200Standard Rolls4Ø 30        Ø 10900        200Optional Rolls5Ø 60x1,5        Ø 25x1,51000        600Optional Rolls61 1/2”x2,9        1/4”x1,8600        300Optional Rolls750x30x3        40x20x21200        800Optional Rolls840x3        30x21200        800Optional Rolls940x40x5        30x30x4600        300Optional Rolls1035x35x5        30x30x4600        400Optional Rolls1150x6        20x3600        400Standard Rolls1250x6        20x3600        400Standard Rolls1350x6        20x3600        400Standard Rolls         * Special washer (spacer) can be necessary / Only with special Beam Bending Attachment        •Capacities are given for 260 N/mm² plate yielding strength       

Condition: new, angle iron / side length: 60 x 60 x 6double T-iron over x-axis: UPN 80 UNP 30U-iron over x-axis: UPN 65 UPN 30total power requirements: 3weight approx.: 1,4messurements (LxWxH): 1200 x 1100 x 800 Hedpfxjd Acazs Al Iel

Condition: new, Shaft diameter: 315working speed: 7motor power: 7,5length: 2000width: 1450heigth: 1700weight approx.: 3650 Technical specifications: - Steel construction welded frame - 3 Rolls are powered - Hardened and ground shafts made of high tensile special steel - Rolls are hardened and ground - Horizontal and vertical working position - Hardened standard rolls - Mobile control panel - 3 Axis mechanical lateral angle guide rolls - Brake motor equipped for the precision bending Hedpfx Aljh Alics Iel - Digital Read-Outs (2pcs) Options: - Digital Readout STANDARD - NC Unit 7 Screen EURO 9.000,--

Condition: new, Shaft diameter: 30Upper Roll Diameter: 148Bottom Roll Diameter: 118working speed: 2-4motor power: 0,7 - 0,85length: 600width: 800weight approx.: 220heigth: 1450 Technical specifications: - Steel frame - Two bottom rolls are powered - Direct drive power system with gears Hodpfxsd Eqqzj Al Ijl - Top roll is idle ( free turning ) - Hardened rolls - Rolls shafts are special steel material hardened and ground - Double speed motor - Standard rolls - Adjustable guide rolls - Horizontal and vertical working position Options: - Digital Readout EURO 600,-- - Angle Lateral Guide Rolls EURO 900,-- - Double Speed Working STANDARD - Brake Motor Option EURO 150,--                                                                                                                                                                                                                                                                                                                                                                                                                PK 30 file TypeSizeMin. DiaNotes150x10        20x61800        300Standard Rolls280x15        30x6700        400Standard Rolls330x30        10x10900        200Standard Rolls4Ø 30        Ø 10900        200Optional Rolls5Ø 60x1,5        Ø 25x1,51000        600Optional Rolls61 1/2”x2,9        1/4”x1,8600        300Optional Rolls750x30x3        40x20x21200        800Optional Rolls840x3        30x21200        800Optional Rolls940x40x5        30x30x4600        300Optional Rolls1035x35x5        30x30x4600        400Optional Rolls1150x6        20x3600        400Standard Rolls1250x6        20x3600        400Standard Rolls1350x6        20x3600        400Standard Rolls         * Special washer (spacer) can be necessary / Only with special Beam Bending Attachment        •Capacities are given for 260 N/mm² plate yielding strength