Torque and Torque Wrenches力矩和力矩扳手
NOTE: The strongest threaded joint is one in which the load applied to the fastener when it is installed is greater than the maximum load that will be applied to the joint in service. If a threaded fastener does not fail when it is being properly torqued, it will not fail in service.
注：最大螺纹接头是安装紧固件的载荷大于使用接头的最大载荷。如果螺纹紧固件在正确拧紧时没有失效，则在使用中不会失效。
Click-Type Torque Wrench
咔嗒型扭矩扳手
Twist the handle until a reference mark aligns with a graduation on the shaft of the wrench indicates the desired torque. Place the correct socket on the wrench and put it on the fastener to be torqued. With the wrench perfectly square to the fastener, apply a smooth pull on the wrench until it clicks. Clicktype torque wrenches do not limit the amount of torque that can be applied; rather, they indicate the set amount of torque being applied when they click. Stop the pull as soon as the wrench clicks.
旋转手柄，直至参考标记与扳手杆上的刻度对齐，以指示所需的扭矩。将正确合适的套筒安装在扳手上，并将其套在要拧紧的螺栓上。确保扳手与紧固件完全垂直，然后平稳地对扳手施加拉力，直至听到“咔哒”声。咔嗒型扭矩扳手不会限制可施加的扭矩量，相反，而是当听到“咔哒”声时，表明已施加到设定的扭矩量。听到“咔哒”声后立即停止施加拉力。
Deflecting-Beam Torque Wrench
偏转型力矩扳手（不会翻译）
It is important that the socket is square on the fitting and the force applied to the wrench is concentrated at the pivot point on the handle. The torque read on the wrench (TW) measured in inchpounds is the product of the lever length (L) in inches and the force (F) in pounds.
重要的是，套筒必须与连接件垂直，施加在扳手上的力必须集中在手柄的枢轴点上。扳手上的扭矩读数（TW）以英寸-磅为单位，是力臂长度（L）以英寸为单位和力（F）以磅为单位的乘积。
When using an adapter on a torque wrench that adds to the lever length, you must use the formula below to determine the torque reading on the wrench TW in order to attain the required amount of torque applied to the fastener by the adapter TA.
在增加力臂长度的扭矩扳手上使用适配器时，必须使用以下公式来确定扳手上的扭矩读数TW，以达到适配器施加到紧固件上的所需扭矩TA。
When the extension subtracts from the lever length of the wrench, use this formula.
当延伸杆减去扳手的力臂长度时，请使用此公式。
Torque Conversions
力矩换算（转换）
Recommended Torque Values
推荐力矩值
The International System of Units (SI) is the modern form of the metric system, and is used in many countries; however, the U.S. continues to use the U.S. customary system. The SI unit for torque is newton meters (N.m); in the U.S. customary units, it is foot-pounds force (ft-lbf ).
国际单位制（SI）是公制的现代形式，在许多国家都有使用；然而，美国继续使用美制单位。扭矩的国际单位是牛顿米（N.m）；在美制单位中，它是磅英尺（ft-lbf）。
1 N.m = 0.738 ft-lbf
1 ft-lbf = 1.355 N.m
1 inch-pound (in-lbf ) = 0.1129 N.m
In some of the European countries, torque is measured in m.daN .
在一些欧洲国家，扭矩的测量单位为m.daN（1 N.m.的10倍）。
1.m.daN = 7.38 ft-lbf or 88.5 in-lbf