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Table of Contents◗TENSION CONTROL BRAKESWeb ProductsXTB 12A & XTB 12 Tension Control BrakesNote:Dimensions inINCHES[MM]A B G BORE RANGES *MODEL W/OUT WITH C D E * FGUARD GUARDSTD. MIN. MAXH J K LXTB 12A 17.81 19.06 6.64 12.0 .375 STD (3) .500-13 1.625 1.250 2.125 16.0 4.125 2.52 17.00& XTB 12 [452] [484] [118] [305] [9,525] [12.7] [41] [32] [54] [4064] [105] [64] [432]* Bored-to-size rotors available upon request. See Bore & Keyway Dimensions.NumberNumberXTB 12A & XTB 12 TORQUE (INCH POUNDS)Coefficient of Frictionof 0.15 (LoCo) 0.30 (Std)Calipers 80 PSI 1 PSI 80 PSI 1 PSI1 573 7 837 102 1145 14 1674 213 1718 21 2511 324 2290 29 3348 425 2863 36 4186 526 3435 43 5022 63Note: Rated torque may vary depending on operating conditions.Friction coefficients are nominalXTB 12A & XTB 12 TORQUE (NEWTON METERS)Coefficient of Frictionof 0.15 (LoCo) 0.30 (Std)Calipers 550 kPa 7 kPa 550 kPa 7 kPa1 65 0,8 95 2,32 129 1,6 189 2,33 194 2,4 284 3,64 259 3,3 378 4,75 324 4,1 473 5,96 388 4,9 568 7,1CONTINUOUS THERMAL DISSIPATION (Hp)Cross Drilled XTB 12A vs. XTB 12THERMAL HORSEPOWER vs. SPEED(Speed Limited to 2800 RPM)24.00 18,022.00 16,520.00 115,018.00 13,516.00 212,0314.00 10,512.0049,010.00 7,58.00 6,06.00 4,54.00 3,02.00 1,50 00 500 1000 1500 2000 2500 3000 3500SPEED RPM1 XTB 12A, Optimum HP t , Cross-Drilled Rotor 2 XTB 12, Optimum HP t , Standard Rotor3 XTB 12A, Optimum Facing Wear, Cross-Drilled Rotor 4 XTB 12, Optimum Facing Wear, Standard RotorCONTINUOUS THERMAL DISSIPATION (kW)Torque Values for Ultra LoCo “FacingsMultily “LoCo” torque by 0.67 for the torque with Ultra LoCo facings.206
Table of ContentsWeb ProductsTENSION CONTROL BRAKES ◗XTB 12A & XTB 12 Tension Control BrakesBORE AND KEYWAY DIMENSIONSBore Range Key (Square) Keyway Tolerance1.250 0.250 +.002 –.000[29,21] [6,35] [+0,05 – 0,0]1.312 – 1.375 0.312 +.003 –.000[33,32 – 34,92] [7,92] [+0,07 – 0,0]1.437 – 1.750 0.375 +.003 –.000[36,50 – 44,45] [9,53] [+0,07 – 0,0]1.812 – 2.125 0.500 +.003 –.000[46,02 – 53,98] [12,7] [+0,07 – 0,0]Note: Bushings notacceptable for XTBapplications. Boresizes not indicatedare available (seeMin./Max, ranges ondimensional drawing).ORDERING INFORMATIONXTB Tension Controlled Brakes are custom assembled for each application.Consult with Nexen Technical Service to determine your exact needs.Quantity Description Shipping Wt.Lbs. [Kg]1 Rotor, Hub, & Mounting Plate Assembly See below1–6 Caliper Assemblies as required See below1–6 Friction Facing Kits as required See below1 Guard (Product No. 835447) 17 [7,7]ROTOR, HUB & MOUNTING PLATEBest thermal dissipation if brake is ordered for direction of rotation. Reduce by 10% for 0-500 RPM and reduce by 25% for 501-1800 RPM.Hub Bore Hub Bore Rotor ShippingModel (CCW) Diameter Product Model (CW) Diameter Product Max. Inertia Wt.INCHES Number INCHES Number RPM Lb.Ft 2 Lbs.[MM] [MM] [Kgm 2 ] [Kg]XTB 12A 1.25 835657 XTB 12A 1.25 835656 3300 3.60 60XTB 12 [32] 835412 XTB 12 [32] 835411 [0,15] [27,2]XTB 12A 1.625 835659 XTB 12A 1.625 835658 3300 3.60 60XTB 12 [41,2] 835414 XTB 12 [41,2] 835413 [0,15] [27,2]XTB 12A 2.125 835661 XTB 12A 2.125 835660 3300 3.60 53XTB 12 [54] 835416 XTB 12 [54] 835415 [0,15] [24,0]NOTE: XTB 12A Rotors are Cross-Drilled for Optimum Thermal Dissipation.CALIPER ASSEMBLIESEach caliper assembly has two caliper halves. Order one caliperassembly for each caliper position. The number of caliperpositions is determined by your torque requirements.ProductShipping Wt.Model Number Description Lbs. [Kg]XTB–12 835451 1 Caliper Assembly 4.5 [2]FACING KITS–ALL MODELSFacing kits contain two asbestos-free facings of organicUltra LoCo, lowcoefficient or <strong>friction</strong>, or standard coefficient of <strong>friction</strong> low dust Kevlar ® .One facing kit per caliper assembly is required.Facing Ultra LoCo (0.10) LoCo (0.15) STD. (0.30) Kevlar ® Shipping Wt.Kits Product No. Product No. Product No. Lbs. [Kg]1 835643 835471 835631 1 1.00 [0,45]1 Use ‘Optimum Facing Wear’ Thermal Curves.Kevlar ® is a registered trademark of DuPont Company.207
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Table of ContentsPRODUCTCAT ALOG10-
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Table of Contents◗PRODUCT NUMBER
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Table of Contents◗FAMILY OF PRODU
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Table of Contents“Air Champ” ®
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Table of Contents◗APPLICATION GUI
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Table of ContentsWeb ProductsGUIDE
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Table of Contents◗ MICRO FRICTION
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Table of ContentsWeb ProductsIn acc
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Table of ContentsWeb ProductsTENSIO
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Table of ContentsWeb ProductsHousin
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Table of Contents◗ AIR PRESSURE C
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Table of ContentsEclipse SERVOMOTOR
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Table of ContentsEclipse SERVOMOTOR
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Table of ContentsEclipse LINEAR MOT
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Table of ContentsEclipse NEMA AC MO
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Table of ContentsEclipse METRIC AC
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Table of Contents◗ BW MODEL BRAKE
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Page 178 and 179: Table of ContentsDRUM BRAKES “Air
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Table of Contents◗CLUTCH/BRAKES
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Table of ContentsCLUTCH/BRAKES “A
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Table of Contents◗WEB AUXILLARY C
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Table of Contents◗REPAIR KITS“A
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friction clutches - Arten Freios e Embreagens Industriais

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