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Resumen del manual
Typical socket extensions that remain perpendicular to the ratchet head do not change the length of the torque wrench, and therefore, do not change the torque applied to the fastener. Extension Formula L-H ™=TE (ttt) TE = Actual Torque at Extension TW = Torque Setting on Wrench E = Extension Length L = Torque Wrench Length from Drive to Center of Handle Example: To reach 50 Lb.ft of torque with a 6" long extension, set the torque on the wrench to 37 Lb.ft. See the steps below for details. E = 6" ( 17 \ L= 17" Step 1. TW = 50 ( -| 7 + g J TE = 50 Lb.ft / \ Step 2. TW - 50 (0.739J Set Torque to TW = 37 Lb.ft Step3. TW = 36.95 Typical Fastener Torque Settings The charts below offer average torque recommendations for different fastener sizes. Exact torque settings are defined by fastener material type and plating, lubrication, surface finish, and whether or not the parts being fastened have gasketed joints. Always follow the manufacturer’s torque recommendations for your particular fasteners. Regardless of any torque recommendations, NEVER exceed the maximum torque setting on your wrench. Inch Fastener Torque Settings in Foot Pounds Material/Grade Bolt Size SAE 2 A307 SAE 5 A325 SAE 8 A354 1/4-20 6 10 12 5/16-18 12 20 25 3/8-16 22 38 50 7/16-14 36 55 85 1/2-13 58 85 125 9/16-12 80 125 175 5/8-11 112 175 245 3/4-10 180 300 425 Metric Fastener Torque Settings in Foot Pounds Material/Grade Bolt Size CLASS 4.8 CLASS 8.8 CLASS 10.9 M5-0.8 3 5 8 M6-1 4 9 13 M8-1.25 12 22 32 M10-1.5 24 44 63 M12-1.75 41 76 111 M14-2 66 123 177 M16-2 103 199 280 M20-2.5 131 258 354 MODEL H8000/H8001 INDUSTRIAL TORQUE WRENCH INSTRUCTION SHEET COPYRIGHT © AUGUST, 2006 BY GRIZZLY INDUSTRIAL, INC. WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC. #TR8543 PRINTED IN CHINA Introduction Use this wrench to tighten fasteners (nuts, bolts, etc.) to specific torque settings. During operation, when the preset torque is reached, the torque wrench will "click" to indicate that tensioning is finished and no more pressure should be applied. This model features a 45-tooth reversible ratchet that has the capability to torque both left and right handed fasteners. This model is built with hardened alloy and rubber grips for long-term industrial use; however, as with all torque wrenches, the internal mechanisms can be damaged if the wrench is used or stored improperly. To keep your torque wrench working accurately, we strongly recommend that you carefully follow the Operation Tips and Torque Wrench Care on this sheet. Typical Usage 1. Unlock the handle, set the desired torque, and lock the handle. 2. Attach a socket and set the ratchet direction. 3. Hold only the handle of the wrench and tighten the fastener slowly until the wrench clicks, then stop applying pressure (continued pressure may damage the torque wrench internal components). 4. Repeat as necessary with the remaining fasteners. 5. After using the wrench, unlock and turn the handle to the lowest setting for storage. (Don’t adjust the setting lower than the minimum torque setting or you may damage the wrench.) Setting Ratchet Direction Twist for Forward/Reverse ( ) Reading Torque Scales Optional Metric Units. ,Major Units o_ 00 o _I N.m 60 I I I I 70 | Lh ft 50 : i • Lb .ft Current Setting Minor Units Adjusting Torque Setting Twist Handle () m3 Locking/Unlocking Handle Pull = Unlock Push = Lock Model H8000 Specifications Maximum Torque Setting.................................100 Lb.ft Minimum Toque Setting.....................................20 Lb.ft Model H8001 Specifications Maximum Torque Setting.................................250 Lb.ft Minimum Toque Setting.....................................50 Lb.ft Operation Tips • Hold the torque wrench only by the center of the handle when tightening fasteners. Try to keep your forearm perpendicular to the wrench when applying pressure. Holding the torque wrench incorrectly will result in inaccurate final torque tensions. • Tighten fasteners in a slow and controlled manner, and stop applying pressure immediately after the torque wrench clicks. Using the torque wrench in a hurried or jerky manner may result in inaccurate final torque tensions. • Lock the handle after setting the torque so it does not change the setting during use. • If using extensions, refer to the back of this page for important formulas that will help you avoid over-torquing your work. • Fastener threads should be clean and free of any dirt or grime. Dirty threads create excessive friction during tensioning and cause the torque wrench to click before it reaches the true torque. A small amount of lubricant placed on the threads is typically recommended for consistent results. • When tightening many fasteners that hold a single part, torque the fasteners in a criss-cross manner in multiple passes that incrementally work up to...