Buying guide forbest torque wrenches
Over-tightening nuts and bolts is a constant problem for DIYers and professional mechanics alike, on everything from the cylinder head of a semi, to the gear train of a racing cycle.
The solution is a torque wrench. A precision instrument designed for one job: making sure your nuts and bolts are done up with exactly the right amount of force.
The challenge is identifying the torque wrench that’ll best meet your needs.
如果您是工程师或机械师，则可能有特定工作的要求。如果您不是专业人士，但喜欢使用自己的车辆工作，那么您可能想要一个良好的全能扳手。
Best百度必威下载Reviews在这里可以帮助您选择。
Types of torque wrench
Many people will be familiar with what we think of as a "standard" torque wrench – those that look much like a ratchet-drive socket wrench. There are a couple of others:
Preset torque wrenches:Also called torque drivers. Often small, gripped in the palm of the hand. They are set for a single torque amount. Popular with cyclists because of their light weight and portability.
偏转光束扭矩扳手：Available in a wide variety of ranges, from light engineering to heavy industrial. A long beam runs from the head where the socket is attached, down to a scale by the grip. The deflection of this beam, left or right, indicates the amount of torque. It's a common and popular tool in many industries, but the socket is fixed. There's no ratchet action, so it can be difficult to use without plenty of space.
The ones most of us recognize are known as micrometer torque wrenches, though there are some differences.
除了不同类型的扭矩扳手外，还有不同的驱动尺寸。1/2“驱动器在设计用于汽车使用的工具中很常见。通常可用的是1/4英寸，3/8“和3/4”驱动器。
Expert Tip
After use, always return your torque wrench to zero, or the lowest permitted level. Leaving it “dialed up” can put unnecessary tension on components.
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Click wrenches
The most common type available. An audible click, which can also be felt by the operator through the grip, warns when the required torque is reached.
性能，耐用性，易用性和价值的极佳组合。正确使用时准确。
If pressure is applied too rapidly, they can over-tighten. Steady pressure is recommended, stopping immediately the first click is heard. It's common for users to think they need to release and apply an extra click "just to make sure." This is incorrect.
突破扳手
Very similar to click wrenches, but with a hinged section – usually near the socket head – that “breaks” when the required torque is reached.
Easy to use. Good durability and value. Accurate when used properly.
Continued pressure after break will over-tighten. Some people find the 'break' action unpleasant.
Cam-over wrenches
Similar in appearance to click wrenches. Have a built-in slip mechanism that releases pressure when the set torque is reached.
Easy to use. Will not over-tighten, even with renewed pressure. Guarantees repeatable accuracy that is unaffected by user skill-level.
Complex mechanism makes them very expensive.
拨号扳手
At first glance, looks like a click wrench with an analog dial, but the dial is there as a guide only, and does not set torque limits.
Durable. Can be very accurate.
Bulky. Difficult to use. The problem with dial wrenches is that they rely on a high level of operator skill. Most have no audible warning, nor do they break or cam-over. You must watch the dial (not always easy), and react accordingly.
Digital wrenches
These are the most recent development, and are becoming quite common. An LCD readout displays torque readings. "Traffic light" LEDs and/or audible warnings change as the desired torque level is approached.
可以准确到四个小数点。他们的价格竞争性。有些可以存储数据以进行以后的比较和记录保存。
No mechanical limit, so again, they rely on user skill. Some concerns over robustness of electronic components. Negligible advantages over mechanical alternatives.
Did you know?
When using a “click” type torque wrench, one click is all you need to tell you you've reached the desired limit. Once you've heard that click, move on to the next fixing. You'll save yourself time and effort.
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扭矩测量
扭矩通常以英尺磅（英尺磅）或牛顿仪表（NM）的度量标准尺度测量。尽管不太常见，但也可以以英寸磅（英寸磅）或千克（kg。cm。）（kg。cm。）进行测量。
A mechanical torque wrench will have one or two of these scales (generally foot pounds and/or Newton meters).
通常可以为所有这些模型设置数字模型，但并非总是如此。不要这样。
For your safety
Don't use an extension bar on a torque wrench – the majority are calibrated to work with the handle length as supplied.
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Torque wrench range and accuracy
The most popular torque wrench is the click-type, or its digital counterpart, so those are what we have focused on with our recommendations. However, the following rules and characteristics can be applied to any kind of torque wrench.
The accuracy of a torque wrench should be stated as either:
全尺度（FS）或
Indicated Value (IV).
This can be a little confusing.
A torque wrench that quotes, for example, +/- 4% over the Full Scale, may be less accurate than that at certain points along the scale (commonly lower torque settings). Its overall average accuracy is +/- 4%.
在任何指示的值下，引用+/- 4％的工具，其规模上的任何位置都不超过4％。它比引用全尺度的一个更准确。
This distinction isn't always made clear by manufacturers. Whether this is important to you will depend on the precision your job requires. If it's a concern, check with the manufacturer before purchase.
The other important point is that with click-type torque wrenches, accuracy is not quoted over the whole range. 20% to 100% is common. This is because it's difficult for this kind of mechanism to maintain control, and therefore accuracy, at the lower end.
So if, for example, you have a wrench with a range from 25 to 250 foot pounds, it may not achieve its stated accuracy until it gets to 45 foot pounds (20% of range). If you need accuracy at a lower setting, it may be necessary to choose a smaller overall range. A wrench with a range from 10 to 150 foot pounds, should work accurately from 28 foot pounds on up.
Alternatively, dial-type torque wrenches can maintain accuracy from 0% to 100%. However, they are considerably more expensive.
Expert Tip
When setting a manual torque wrench, always start from zero – or the lowest setting – and work up. You'll get a more accurate setting than coming down the scale.
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Torque wrench features
The popular click-type mechanical torque wrench is easy to use, but settings can slip. A locking collar (sometimes called a slip lock) prevents this from happening.
如果您使用高扭矩设置，则更长的手柄将使您能够更均匀地施加压力，从而保持更好的控制。棘轮头通常允许您使用较大的工具而不会成为问题。
Plastic and rubber grips increase comfort, so you're less likely to drop your torque wrench – particularly on cold days.
Some digital models automatically shut down if left unattended, saving battery life. Some have charge indicators. As with all electronic devices, it's an area that changes rapidly, and manufacturers like to add bells and whistles to attract you. Ask yourself whether these things are worth the extra cost, or just gimmicks.
"It is possible to use some torque wrenches for loosening, but we don’t recommend it. You can easily exceed the maximum torque, and do permanent damage."
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What does a good torque wrench cost?
The enormous range of types and sizes of torque wrench makes it difficult to apply general rules when it comes to pricing.
You can get a perfectly good torque wrench for a bicycle for$25. You can get an entry level model for home auto repair at around$40，但是需要更精确的专业机械师或工程师很容易花费五倍。
我们的购买指南应帮助您缩小要求。掌握这些信息，您可以比较单个元素，直到您满足您的特定需求的最佳扭矩扳手。
Caution
Never use a torque wrench as a breaker bar.
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扭矩扳手提示
如果您正在从事一份复杂的工作，并且您担心在将它们拆开时会走向何处，请使用手机在“图片之前”和“”图片中拍摄。必威体育娱乐app然后，您将获得方便的参考，以正确的顺序 - 是时候将所有内容放回原处时。
除非专门制造商的指示,never grease or oil nuts and bolts before tightening. You may think lubrication will make them easier to undo next time, but it can stop them tightening properly. If the maker didn't do it, you shouldn't either.
分三个阶段拧紧。首先，用手在螺母或螺栓上绕。他们不必紧绷，您只是把它们放在那里。
其次，将扭矩扳手设置为建议的总数一半。如果您有一个以上的螺母或螺栓，则可能有制造商建议的固定顺序。遵循它很重要。
第三，将扳手设置为最终扭矩量，然后再次按照序列进行操作。这样可以确保甚至准确的拧紧 - 在诸如缸盖之类的东西上尤其重要。
FAQ
Q. Do torque wrenches need specific care or maintenance?
A.高质量的扭矩扳手是一种耐用的工具，应该提供多年的服务，但他们需要一些照顾。它因类型而异，因此始终仔细遵循制造商的说明。大多数是常识。注意使用时不要将其丢弃。保持卫生。在另一种情况下存储，因此其他工具不会损坏它。扭矩扳手应定期重新校准 - 建议定期使用的工具每年一次。同样，请遵循制造商的建议。
Q. Do I really need to use a torque wrench on lug nuts? In the auto shop, they just use an air gun?
A.When manually tightening lug nuts, it's surprisingly easy to over do it. It's possible to strip or break wheel studs, and even warp brake rotors. Both are expensive to fix, and the latter has the potential to be extremely dangerous. Use of a torque wrench helps avoid such problems.
While they certainly do use air tools in pro shops, and there's nothing like an impact wrench for breaking a stubborn nut free, the tool has a built-in clutch that's used when replacing your wheel, to avoid over-tightening.
Q. How do I convert foot pounds (ft. lbs.) to Newton meters (Nm) and vice versa?
A.1 foot pound equals 1.3558 Newton meter, so if you want to turn that around, 1 Newton meter equals 0.7376 foot pounds.
You can do the math from there. Alternatively – and much more easily – you can either look up conversions on the internet (you can print out a chart and tape it to the garage wall), or get a conversion app for your smartphone!
