Used Saw Blades Set For Multiple Rip Saws for sale (21,371)

Year of construction: 2022, condition: new, I sell 150 sets of new saw blades suitable for multiple rip saws multirip cutting machines. Dimension saw blade PILANA 290 x 2,5 x hole 60 teeth 30+4 FZ and PILANA 250 x 2,3 x hole 60 teeth 30+4 FZ Kodpow Am Imjfx Adledt Price totally 2000 Euro. Available immediately.

Condition: new, Year of construction: 2025, functionality: fully functional, machine/vehicle number: 1624, tooth pitch: 1 mm, We offer this new ILPRO Technology I80GF-C saw-blade sharpening and I70 GF setting machine, year of manufacture 2025. Model: I80GF-C sharpening machine for bandsaw blades Serial number: 1624 Year of manufacture: 2025 TECHNICAL DATA: BANDSAW BLADE Width 8-80 mm Thickness 0,4-1,2 mm Tooth pitch 1-28 mm Clearance angle 0°-12-20° Teeth/minute 10-100 Ksdpozudfwefx Adlodt Model: I70GF setting machine for bandsaw blades Serial number: 1625 Year of manufacture: 2025 TECHNICAL DATA: BANDSAW BLADE Width 8-80 mm Thickness 0,4-1,2 mm Tooth pitch 3-28 mm Clearence angle 0°-12-20° Teeth per minute 120-200 If you have any questions or need more information, feel free to send us a message or give us a call.

Condition: excellent (used), The 21-blade trimmer saw very little use. Kodpjy Drnbsfx Adledt

Condition: excellent (used), Year of construction: 1997, Rip and cross saw REMA DMLK 30 Producer of REMA Machine model / type DMLK 30 Year of production 1997 Machine category Longitudinal and transverse saw Location Gorzów Wlkp. Conditions of delivery PERSONAL COLLECTION Cost of delivery Kdedpofv Hphefx Adlet Customer cover Startup type to be agreed Description Comments - after the technical review - very good condition - year of production 1997 TECHNICAL PARAMETERS: main engine 3.9 kW trolley length 1370 mm blade diameter 300 mm angle adjustment 0 - 45 " height adjustment cutting height max. 90 mm cutting width on the right side 885 mm ruler length 1350 mm ratchet extended receiving table two kinds of blade rotation speed 3700 and 5000 RPM The protractor visible in the photos is an additional option for PLN 400 net dimensions: length / width / height 135 x 85 x 135 cm weight ~ 320 kg

Condition: new, Year of construction: 2025, functionality: fully functional, The ASM 6-30 is a high-speed tooth setter for band saw blades, making it perfect for companies that use different volumes of bandsaw / sawmill blades per day. The machine is very user-friendly and easy to set up, making it the ideal solution for a wide variety of customers with different experiences in the industry. Voltage - 220V Frequency - 50Hz Power - 220V Secondary voltage - 24V Kdodpsxivgcofx Adlet Blade width - 15mm-60mm Tooth pitch - 6-30mm Accuracy - +- 0.04mm Blade thickness - 1.2mm Possible types of tooth set - left, right,straight/right,left,straight The machine is very user-friendly and easy toset up, making it the ideal solution for a wide variety of customers withdifferent experiences in the industry. Achieving precise tooth setting isessential for straight cutting and extended blade life, and our advancedclamping system delivers an impressive accuracy of 0.04mm. Capable of setting80-120 teeth per minute, the ASM 6-30 enhances your company's efficiency andensures a smooth workflow.

Condition: used, Year of construction: 2008, functionality: fully functional, manual in images. This is a 5 head horizontal Band Saw. It has tilting heads making it ideal for Feather Edge board production. It has 18KW motors. This machine comes with its own saw sharpening equipment and 10 new blades. All power feed wheels have been replaced with new. It runs on 30mm blades. All new power feed sprockets and fully DC braked. Kedpfx Aszwh Rcjdlodt

Condition: excellent (used), CATALOG NUMBER 7901 Technical specifications: - track width: 300mm - working width of roller: 300mm - max saw blade diameter: 350mm - saw blade bore diameter: 70mm - max cutting height: 120mm - table width with extension: 750mm - table length: 1530mm - from above: - kickback prevention barriers (safety barrier against material reverse) - metal sliding roller - kickback prevention barriers - metal sliding roller - shaft with saw blades - 2 smooth metal sliding rollers - from below: - guide rail - kickback prevention barriers - track - central track lubrication - stepless feed speed adjustment - feed motor: 1.5kW - main motor: 22kW - brake - suction nozzle diameter: 200mm - overall dimensions (L/W/H): 2300x1370x1570mm - weight approx.: 1700kg ADVANTAGES – Italian manufacturing – very good condition – technical DTR documentation – used multi-blade saw Net price: 32,900 PLN Net price: 7,830 EUR (calculated at 4.2 PLN/EUR) (Prices may change with significant exchange rate fluctuations) Kdedpfx Adozul Akelot

Year of construction: 2006, condition: new, I sell 12 sets of new saw blades suitable for HOLZMA panel beam saw machines. Main saw blade FABA 600 x 5,8 / 4,0 x 60 Z 72 Scoring saw blade AKE 26 200 45H 200 x 4,8 - 5,8 x 45 Z=36 Kdsdpjg Dvutjfx Adlot Price totally 1000 Euro. Available immediately.

Year of construction: 2024, condition: new, - 50 mm cutting height - 1210 mm cutting width Kdodpfxefdzrhe Adlst - 12 driven rollers - 10 - 30 m/min variable feed rate - 37 KW Sawing Motor (more is possible) - 2,2 KW Feed Gearbox - 70 mm Sawing spindle - 225 mm Circular Saws - 4000 Kg weight of the machine

Condition: as good as new (ex-display), Year of construction: 2005, ACCEPTANCE OF SELF feed head is held on the guides of hardened cylindrical surface and additionally treated grinding. Three-phase motor power 3HP 2800 rpm / min. Output frontal saw blades with cutting heads. Feed discs cost of delivery SEMI AUTOMATIC DOUBLE MITRE SAW Technical Data Right head displacement by means hand wheel Reading of the cutting dimension on high precision metric scale with micrometric adjustment Sliding of the moving head by means of ricirculating ball bearings on rectified and tempered guides Radial sliding of the sawing group Full protection of the sawblades by means of safety hoods with automatic closing Pneumatic heads tilting at 90°/+ 45°/-45° Possibilty to mount sawblades Ø 500 - 530 - 550 mm 2,2 Kw (3 HP) 3 phase motors - 2800 r.p.m. Sawblade shaft Ø 30 mm Cutting lenghts 4000/5000/6000 mm Kodpsb Rnv Sefx Adlodt Working pressure 7 bar Overall dimensions 524-624-724x139x155 cm Weight 1200 - 1350 - 1500 Kg Standard Equipment Horizontal pneumatic clamps Automatic lubrication by means of nebulizer Air filter Air gun Service spanners Optionals Reading of the cutting dimension on digital display Turning vertical clamps kit Pneumatic central support Manual central support Right head in feed roller conveyor Semi-automatic reduced cut modification c/w in feed roller conveyor Vee notch device for PVC profiles Micro-spray nebulising device Pneumatic support for long bars cover customer Startup type negotiated Description Notes Saw 2 a head for precision cutting of aluminum profiles GAMMA. Precise double miter saw for serial production of blanks at an angle of 90 ° and 45 °. Convenient and safe execution of multiple cutting operations. Automatic positioning of the moving cutting head. Automatic positioning of the moving cutting head. Adjustable stroke discs. The angles of inclination of the cutting head 45 °, 90 °, easy pneumatically. Intermediate angles are adjusted manually using the bumper and angular scale. LENGTH OF CUT = 4000 5220 x 1390 x 1460 mm Weight 1200 kg.

Condition: used, Year of construction: 2015, functionality: fully functional, SECOND-HAND MULTI RIPS SAW CML MOD. SCAJ350RT - CE RULES - N. 2 mobile blades - Kw 37 - Year 2015 Kodpfxjx Run Rs Adljdt

Condition: excellent (used), Catalogue number: 7545 TECHNICAL DATA Track width: 250mm Shaft width: 220mm Max blade diameter: 300mm Blade bore diameter: 60mm Cutting height: 100mm Ksdpfoztad Tex Adlodt Table width: 650mm Table length: 1460mm – Top: 2 rows of pawls Smooth feed roller Blade shaft Smooth feed roller – Bottom: Guide rail Pawls Track 2 feed speed settings + stepless adjustment Central lubrication Feed motor: 1.2kW Main motor: 21kW Extraction outlet diameter: 180mm Overall dimensions (L/W/H): 1700x1450x1500mm Weight: approx. 1800kg – Made in Italy – DTR technical documentation – Robust machine – Used multi-blade saw, in very good condition Net price: 25,900 PLN Net price: 6,160 EUR depending on exchange rate 4.2 EUR (Prices may vary with significant fluctuations)

Condition: used, Year of construction: 2011, • Cutting length: 4,200 mm • Motor: 11 kW (15 HP) • High cutting precision thanks to the free-standing, torsion-resistant steel frame and carriage guidance running on oversized, hardened and ground round steel rails. • Infinitely variable feed speed controlled by foot pedal over the entire cutting length. • Feed speed: 1–80 m/min • Saw spindle speed: 2,900 rpm Kodpfx Adjzkkf Aelodt • Maximum cutting height with Ø 600 mm saw blade: 190 mm • Maximum cutting height with Ø 400 mm saw blade: 90 mm • Rip fence and machine table. • Rip fence adjustment via multiple control levers on the front of the machine for precise positioning, with a large digital readout. The fence can be easily rotated and tilted. • Rip fence adjustment range up to 800 mm. • Control system o Electronic machine and fence control (PLC control) with an easy-to-read touchscreen. • Swivel-mounted control panel on a swing arm. • One 30 mW red laser for displaying the cutting line. • Fast and safe saw blade change using the "Easyfix" quick-clamping system. • Safety guard with automatic opening assisted by two gas springs. • One carbide-tipped saw blade: 450 × 4.4 × 80 mm, Z=40 teeth. • Saw blade bore diameter: Ø 80 mm. • Electrical equipment o Control cabinet integrated into the machine frame. • Connection data o Upper right extraction port: Ø 160 mm o Lower left extraction port: Ø 160 mm o Extraction air velocity: 30 m/s o Total air requirement: 4,340 m³/h o Compressed air supply: 6–8 bar • Specifications are provided for information only. This machine is offered for sale on behalf of a customer. Viewing is available by prior arrangement. Please contact us through the platform's messaging system for further information and the relevant technical contact details.

Condition: used, Vesto saw with two discs for sale - electric motor: 2 x 7.5 kW, - complete with hydrostation, - electrical cabinet. Kdedpotqt T Isfx Adlot

Condition: new, Year of construction: 2024, functionality: fully functional, input voltage: 400 V, type of input current: three-phase, The innovative flash butt welding machine for bandsaw and bimetal blades is developed entirely by our engineering department. It guarantees perfect welds and precise repeatability of the process. User friendly touch screen display from Schneider Electric that allows you to operate the machine effortlessly. The welding process is fully automatic, with the capability to adjust the electric current in 6 stages. The machine also allows for stepless regulation of electric current during annealing and pyrometric control throughout the welding process. The FBM10 is extremely easy to set up and cost-effective to maintain. Power supply voltage 400V Rated transformer capacity at 50% duty cycle 5kVA Frequency of electrical current 50HZ Clamping of the band saw blade Manual or Hydraulic clamping /Optional FBM 10.02/ Annealing Manual or Automatic, with pyrometric control /Optional/ Kdjdoxhf Dzspfx Adlst Menu language Bg / En / Possibility for welding: - band saw blades for wood mm 6÷60 - Bi-metal band saw blades mm 6÷54 - stainless steel band saw blades mm 6÷40 - band saw blades without teeth mm 6÷50 Weight: 197kg Dimensions: (length х width х height) mm 910 х 640 х 530

Condition: new, Year of construction: 2025, The ZM101 is a pioneering product in our lineup, designed to sharpen sawblades with widths of up to 100 mm at a remarkable rate of 65 teeth per minute. This efficiency enables it to simultaneously service 3-4 bandsaw/sawmill machines. Equipped with an abrasive ceramic disk, the ZM101 can expertly sharpen all teeth with profiles. Its robust construction allows it to perform reliably under the most demanding conditions, making it a favorite among our customers. Additionally, its straightforward design ensures ease of use and low maintenance costs, further enhancing its appeal. Technical characteristics: Maximum length of the blade: 6000 (8000) mm Minimum width of the blade: 20 mm Maximum width of the blade: 100 mm Maximum height of the tooth: 12 mm Front angle of the tooth: 0÷25° Tooth pitch: Profile N: 10, 12.5, 15, 20, 25 mm Profile WM: 22, 25 mm Working capacity: 65 teeth/min Size of the abrasive disc: Cut-in sharpening, profile N: ø200 x 10 x ø32, ø200 x 13 x ø32 mm Profile sharpening, profile WM: ø200 x 8 x ø32, ø200 x 10 x ø32 mm Voltage: 380 V Kedpfx Adoxlfwpolodt Power of the electric motors: 0.09 and 0.37 kW Size: Without band saw holder (L x W x H): 750 x 550 x 1100 mm With band saw holder (L x W x H): 2000 (3000) x 1000 x 1100 mm

Condition: new, Year of construction: 2025, The ZM101 is a pioneering product in our lineup, designed to sharpen sawblades with widths of up to 100 mm at a remarkable rate of 65 teeth per minute. This efficiency enables it to simultaneously service 3-4 bandsaw/sawmill machines. Equipped with an abrasive ceramic disk, the ZM101 can expertly sharpen all teeth with profiles. Its robust construction allows it to perform reliably under the most demanding conditions, making it a favorite among our customers. Additionally, its straightforward design ensures ease of use and low maintenance costs, further enhancing its appeal. Technical characteristics: Maximum length of the blade: 6000 (8000) mm Minimum width of the blade: 20 mm Maximum width of the blade: 100 mm Maximum height of the tooth: 12 mm Front angle of the tooth: 0÷25° Tooth pitch: Profile N: 10, 12.5, 15, 20, 25 mm Profile WM: 22, 25 mm Working capacity: 65 teeth/min Ksdpfx Adoxligusledt Size of the abrasive disc: Cut-in sharpening, profile N: ø200 x 10 x ø32, ø200 x 13 x ø32 mm Profile sharpening, profile WM: ø200 x 8 x ø32, ø200 x 10 x ø32 mm Voltage: 380 V Power of the electric motors: 0.09 and 0.37 kW Size: Without band saw holder (L x W x H): 750 x 550 x 1100 mm With band saw holder (L x W x H): 2000 (3000) x 1000 x 1100 mm

Condition: used, We offer for sale a reliable multi-blade single-shaft rip saw TOS Svitavy PWR 421, designed for efficient longitudinal cutting of wooden boards, slats, and timber elements. The machine is suitable for both softwood and hardwood processing and enables high productivity through the use of multiple saw blades. Key Features & Benefits Heavy-duty multi-blade rip saw Suitable for mass production cutting Processes both softwood and hardwood High accuracy and stable cutting performance Adjustable feed speed Designed for continuous industrial operation Kdsdpfozgtldjx Adlet Technical Specifications Cutting System Saw blade diameter: 250 – 450 mm Max. blade diameter: 450 mm Multiple blade configuration possible Material Capacity Min. material thickness: approx. 12 mm (14 mm depending on setup) Passage height depending on blade diameter: Ø450 mm: approx. 150–160 mm Ø400 mm: approx. 125–135 mm Ø350 mm: approx. 100–110 mm Ø300 mm: approx. 70–80 mm Ø250 mm: approx. 50–60 mm Minimum workpiece length: approx. 750 mm With additional roller (for lower cutting heights): min. approx. 500 mm Working Range Max. right-side cutting width: approx. 405 mm Left-side range: approx. 465 mm Total working width: approx. 870 mm Speed & Performance Spindle speed depending on blade diameter: Ø450 mm: approx. 3,300 rpm Ø400 / 350 mm: approx. 3,800 rpm Ø300 mm: approx. 4,450 rpm Ø250 mm: approx. 5,500 rpm Feed speed: approx. 4 – 40 m/min (adjustable) Drive & Power Main motor power: approx. 45 – 55 kW Feed conveyor motor: approx. 3.5 kW Additional motors: Pressure beam lifting: 0.55 kW Saw spindle lifting: 0.55 kW Blade adjustment: 0.18 kW Machine Construction Feed conveyor width: approx. 450 mm Working height: approx. 850 mm Solid industrial frame for vibration-free operation Operating Conditions Operating temperature: +5 °C to +40 °C Suitable for workshop environment Condition & Sale Terms Condition: Good working condition Reliable and proven industrial machine Dismantling and transport to be arranged by the buyer Advantages High productivity in longitudinal cutting Flexible configuration with multiple blades Suitable for a wide range of materials Durable and robust TOS Svitavy construction

Condition: used, power: 11 kW (14.96 HP), cutting height (max.): 170 mm, total length: 5,850 mm, total width: 2,000 mm, total height: 2,040 mm, overall weight: 3,500 kg, No. 04548 Rip saw / longitudinal circular saw MABA ECO 4200 Used, good condition Automatic longitudinal circular saw with extraction system Cutting length 4200 mm Motor 11 kW Saw blade diameter 350 - 550 mm Kdsdpjzcdn Nsfx Adlot Saw blade bore 30 mm Hydraulic feed 1 - 80 m/min, infinitely variable, with automatic cutting pressure compensation Cutting height 0 - 170 mm, infinitely variable, circular saw blade lowerable Automatic width stop, hydraulic, infinitely adjustable, LED display for width setting PLC control Rear table width approx. 1500 mm Extraction connection diameter 150 mm Transport dimensions approx. 5850 x 2000 x 2040 mm LWH Weight approx. 3500 kg To avoid possible misunderstandings, an on-site inspection by appointment is possible and recommended Sold as is Technical specifications, condition description, year of construction and scope of delivery according to manufacturer’s brochure or previous owner, without guarantee Subject to prior sale For used machines, any warranty is excluded, the following applies: “sold as seen” Payment terms: Prices plus VAT, payment before collection or shipment Delivery terms: ex warehouse

Condition: excellent (used), Year of construction: 1995, power: 22 kW (29.91 HP), input voltage: 400 V, “COSMEC” model SM 320 CE - AUTOMATIC MULTI RIP SAW with main motor 30 HP Kdsdpfx Aey D Acisdljt MAXIMUM CUTTING HEIGHT: 120 mm Maximum cutting width from the first to the last blade: 300 mm Width of feeding belt: 320 mm Feed speed adjustable from 5 to 30 m/min Machine weight: 2200 kg Year: 1995 CE Second-hand, in very good working condition

Condition: used, Year of construction: 2023, For sale is a professional, two-spindle multi-blade saw, model WP 165, designed for efficient longitudinal cutting of wood. This machine is ideal for sawmills and facilities producing packaging components, pallets, structural timber, boards, and garden elements. Thanks to the use of two parallel spindles with a set of circular saw blades, the machine provides high performance, precise cutting, and uniform blade wear. The adjustable spindle carriage allows for adjusting the spindle position, which ensures optimal tool load during operation. Material transport is carried out using four pairs of driven rollers, which ensure secure guidance of the timber. The clamping force is pneumatically adjustable, allowing for stable cutting of both dry, wet, and frozen wood. The machine's design guarantees straight cuts even when processing long materials. Depending on the type of wood, its moisture content, and the number of cuts, the output is approximately 10–18 m³ of wood per hour. TECHNICAL SPECIFICATIONS: - Model: WP 165 - Type: Two-spindle multi-blade saw - Maximum blade diameter: 300 mm - Maximum distance between outermost blades: 320 mm - Minimum cutting thickness: 30 mm - Maximum cutting height: 165 mm - Maximum timber width: 500 mm - Minimum material length: 700 mm - Spindle speed: 3350 rpm Kdodpfozkg Iyox Adljt - Feed rate: 30 m/min - Main motor: 90 kW - Second spindle motor: 75 kW - Feed drive motor: 2.2 kW - Power supply: 3 × 400 V - Pneumatic system pressure: approx. 0.4 MPa (4 bar) - Sawdust extraction: lower – by conveyor or pneumatically, upper – pneumatically. - Year of manufacture: 2023 Machine dimensions: - Width: 1950 mm - Height: 1640 mm - Length (without tables): 1960 mm - Equipment: two-spindle blade set, driven material feed, pneumatic material clamping, infeed table included. This machine is a robust construction designed for intensive operation in a sawmill. The high drive power (90 kW + 75 kW) allows for efficient cutting of thick timbers with high throughput. Please contact us by phone. Machine viewing is possible by prior arrangement. - Where can you see our machines? JBS WOODWORKING MACHINERY WOLICA DRUGA 26 23-310 MODLIBORZYCE Lublin Voivodeship It is possible to test the machine on-site. Financing options are available through leasing or installments. WE ORGANIZE TRANSPORT We also offer a wide selection of woodworking machines, including: panel saws, band saws, and circular saws, planers, jointers, milling machines, grinders, edge banding machines, four-sided planers, drills, presses, lathes, dust extractors, and many other devices from reputable manufacturers. Our range includes machines from brands such as: ALTENDORF, SCM, MARTIN, FELDER, HOLZ-HER, ROBLAND, WEINIG, CASADEI, BRANDT, MAGGI, SAC, STETON, HOUFEK, IMA, OTT, BÜTFERING, HEBROCK, BERNARDO, HOLZMANN, and many others.

Condition: excellent (used), Year of construction: 2015, functionality: fully functional, Vollmer sharpening machine for band saws in a robust design. Kdsdpfx Adez Ad R Neljt Blade width up to 360 mm. 2 switchable tooth profiles. Grinding wheel, CBN, 250 mm diameter.

Condition: repair required (used), Year of construction: 1988, Mechanization for in front of a planer for KVH/BSH - For lengths up to approx. 13 m - Ideal KVH+BSH system for upstream of the planer - Longitudinal destacking – singulation - Cross-cut saws: 4 circular saws with adjustable side positioning Kdodpfx Ajytgr Esdlet - Crosscut dimensions: 180 x 220 mm, 150 x 300 mm - Operation requires only one person

Condition: used, Year of construction: 1989, power: 7.5 kW (10.20 HP), input voltage: 380 V, input current: 15 A, input frequency: 50 Hz, Equipment: documentation/manual, Sale of woodworking equipment: 3 sawing lines (in working condition) We offer for sale 3 complete sawing lines for a woodworking enterprise. The equipment is used but fully operational – the lines are running and actively working right now, so you can inspect them under real-world conditions. Each line is self-contained, equipped with its own dust extraction system, and is sold only as a complete set (without disassembling the machines). 🛠 LINE #1 Productivity: 30–35 m³ per shift. Log length: from 1200 mm to 2500 mm. Configuration: Loading ramp, edger, crosscut saw, 2-arbor multi-blade saw A.Costa, resaw, dust extraction system. Power consumption: Total power – 170 kW (of which, the multi-blade saw itself – 40 kW). Kdjdpszxzudefx Adljt 🛠 LINE #2 (High power) Productivity: 60 m³ per 10 hours of operation. Log length: specifically for 2500 mm (crosscut saw installed). Configuration: Loading ramp, edger, crosscut saw, multi-blade saw A.Costa, resaw, dust extraction system. Power consumption: Total peak power – 430 kW. 🛠 LINE #3 (For long logs) Productivity: 35–40 m³ per shift. Log length: from 2500 mm to 4000 mm (4 meters). Configuration: Loading ramp, edger Walter, multi-blade saw Raimann, trimming saw, dust extraction system. Power consumption: Total power – 200 kW. 📍 Location and terms of sale: Terms of sale: Each line is sold separately and only as a complete set. Disassembling the machines within the lines is not considered. Purchase of the entire complex (all 3 lines) is possible. Price: Available upon request. Location: Volyn region, Kovel (20 km from the city). We invite you to inspect the lines in operation.

Condition: excellent (used), Year of construction: 2004, Multi-blade saw Raimann ProfiRip KR 310 M (2 movable flanges) with package crosscut saw HOLTEC ES 121SHKA and Hurrican extraction system Model: Raimann ProfiRip KR 310 M Year of manufacture: 2004 (refurbished 2022) Multi-rip saw with 2 adjustable saw blades Technical details: Track gauge: 340 mm Kdjdpfx Ajz Altfodljt Total passage width: Maximum 950 mm (instead of 800 mm) Cutting height with/without pressure plate: 115 mm / 130 mm Workpiece length: Minimum 450 mm Maximum saw blade diameter: 380 mm Minimum saw blade diameter: 250 mm Saw blade bore: 80 mm Saw shaft diameter: 65 mm Saw shaft speed: 3,900 rpm Motor: 30 kW Laser guides: 3 units Operating pressure: 6 bar Infinitely variable feed speed: 8–48 m/min Feed motor: 1.5 kW Voltage: 400V / 50Hz