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Table of Contents◗TENSION CONTROL BRAKESWeb ProductsXTB 18A, XTB 18 & XTB 18 DUAL Tension Control BrakesMINIMUMSHAFTINSERTIONNote: Dimensions in INCHES[MM]A B G BORE RANGES *MODEL W/OUT WITH C D E * FGUARD GUARDSTD. MIN. MAXH J K LXTB 18A 24.50 25.88 7.29 18.0 .750 STD (3) .750-10 2.937 2.500 4.500 23.0 4.12 3.17 23.82& XTB 18 [622] [657] [185] [457] [19] [19] [74,5] [63,5] [114] [584] [105] [80,5] [605]XTB 18 DUAL 24.50 25.88 8.64 18.0 .750 STD (3) .750-10 2.937 2.500 4.500 23.0 4.12 4.52 23.82[622] [657] [219] [457] [19] [19] [74,5] [63,5] [114] [584] [105] [115] [605]* Bored-to-size rotors available upon request. See Bore & Keyway Dimensions.XTB 18A, XTB 18 AND XTB 18 DUAL TORQUE (INCH POUNDS)NumberCoefficient of Frictionof 0.15 (LoCo) 0.30 (Std)Calipers 80 PSI 1 PSI 80 PSI 1 PSI1 883 11 1363 172 1767 22 2726 343 2650 33 4089 514 3533 44 5453 685 4417 55 6816 856 5300 66 8180 1027 6184 77 9543 1208 7067 88 10906 1379 7950 99 12269 153Note: Rated torque may vary depending on operating conditions.Friction coefficients are nominalXTB 18A, XTB 18 AND XTB 18 DUAL TORQUE (NEWTON METERS)NumberCoefficient of Frictionof 0.15 (LoCo) 0.30 (Std)Calipers 550 kPa 7 kPa 550 kPa 7 kPa1 100 1,2 154 22 200 2,5 308 43 299 3,7 462 64 399 5 616 85 499 6,2 771 106 599 7,5 925 127 699 8,7 1078 148 799 9,9 1232 169 898 11,2 1386 18Torque Values for Ultra LoCo “FacingsMultily “LoCo” torque by 0.67 for the torque with Ultra LoCo facings.CONTINUOUS THERMAL DISSIPATION (Hp)Cross Drilled XTB 18A vs. XTB 18 & XTB 18 DUALTHERMAL HORSEPOWER vs. SPEED(Speed Limited to 1900 RPM)40.00 29,635.00 1 & 525,930.00 22,225.00 18,520.00 14,815.00 11,110.00 7,55.00 3,70 00 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400SPEED RPM1 XTB 18A, Optimum HP t , Cross-Drilled Rotor 2 XTB 18, Optimum HP t , Standard Rotor3 XTB 18A, Optimum Facing Wear, Cross-Drilled Rotor 4 XTB 18, Optimum Facing Wear, Standard Rotor5 XTB 18 Dual, Optimum Facing Wear, Standard Rotor234CONTINUOUS THERMAL DISSIPATION (kW)210
Table of ContentsWeb ProductsTENSION CONTROL BRAKES ◗XTB 18A, XTB 18 & XTB 18 DUAL Tension Control BrakesBORE AND KEYWAY DIMENSIONSBore Range Key (Square) Keyway Tolerance2.500 – 2.750 0.625 +.003 –.000[63,50 – 69,85] [15,87] [+0,076 –0,00]2.812 – 3.250 0.750 +.003 –.000[71,42 – 82,55] [19,05] [+0,076 –0,00]3.312 – 3.750 0.875 +.004 –.000[84,12 – 95,25] [22,22] [+0,101 –0,00]3.812 – 4.500 1.000 +.004 –.000[96,82 – 114,3] [25,40] [+0,101 –0,00]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 below1–9 Caliper Assemblies as required See below1–9 Friction Facing Kits as required See below1 XTB 18 Guard (Product No. 835444) 17 [7,7]1 XTB 18 Dual Guard (Product No. 835445) 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 18 2.50 835669 XTB 18 2.50 835668 2300 20.14 123XTB 18A [63,5] 835432 XTB 18A [63,5] 835431 [0,84] [55,7]XTB 18 DUAL 2.50 835671 XTB 18 DUAL 2.50 835670 2300 35.95 168[63,5] 835492 [63,5] 835491 [1,51] [76,2]XTB 18 2.9375 835673 XTB 18 2.9375 835672 2300 20.14 122XTB 18A [74,6] 835434 XTB 18A [74,6] 835433 [0,84] [55,3]XTB 18 DUAL 2.9375 835494 XTB 18 DUAL 2.9375 835493 2300 35.95 167[74,6] [74,6] [1,51] [75,7]XTB 18 4.50 835436 XTB 18 4.50 835435 2300 20.14 121XTB 18A [114] XTB 18A [114] [0,84] [54,9]XTB 18 DUAL 4.50 835496 XTB 18 DUAL 4.50 835495 2300 35.95 166[114] [114] [1,51] [75,3]NOTE: XTB 18A 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 18 835451 1 Caliper Assembly 4.5 [2]XTB 18 DUAL 835500 1 Caliper Assembly 5 [2,3]FACING KITS–ALL MODELSFacing kits contain two asbestos-free facings of organic Ultra LoCo, lowcoefficient of <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.211
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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 Contents◗“Air Champ”
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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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Table of Contents◗CLUTCH/BRAKES
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Table of ContentsCLUTCH/BRAKES “A
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Table of Contents◗METRIC CLUTCH/B
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Table of Contents◗WEB GUIDING CON
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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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