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Things to know before using a torque tool Tohnichi
Nowadays, there are many methods to assemble machine parts together such as gluing, welding, pressing, etc. But the method of using bolts and nuts is still used more because of its convenience, economy and ease of operation. But how to tighten properly, what are the benefits of using a torque wrench or torque screwdriver? How to choose the right torque tools for your work requirements. The following article will help you answer the above questions.
1. What is Torque?
Torque is a physical quantity generated when a force F acts perpendicular to a lever arm of length D.
T = F x D (Torque = Force x Distance).
Example 1: D = 1 m, F = 100N, T = 100 Nm
Example 2: D = 2 m, F = 100N, T = 200 Nm
2. The importance of Torque control
Nowadays, there are many methods to assemble machine parts together such as gluing, welding, pressing, etc. But the method of using bolts and nuts is still used the most because of its convenience, economy and ease of operation.
One problem that arises in assembling parts using bolts and nuts is the tightening force, also known as Torque. Over-tightening will reduce the durability of the bolt and nut, which can lead to destruction and damage to the parts. If the tightening force is too small, the joint becomes less durable and is prone to peeling off during operation/use.
For the above reasons, the Torque Tool was born. With an accuracy of ±4% (according to ISO6789 standard, some other brands have higher accuracy of ±3% such as Norbar Torque Tool.
3. Units used in force instruments (Torque)
| Unit to convert |
SI units | British units | Metric Units | ||||
| cN.m | Nm | ozf.in | lbf.in | lbf.ft | kgf.cm | kgf.m | |
| 1 cN.m = | 1 | 0,01 | 1,416 | 0.088 | 0,007 | 0.102 | 0,001 |
| 1 nm = | 100 | 1 | 141.6 | 8.851 | 0.738 | 10,20 | 0.102 |
| 1 ozf.in = | 0.706 | 0,007 | 1 | 0.0625 | 0,005 | 0.072 | 0,0007 |
| 1 lbf.in = | 11.3 | 0,113 | 16 | 1 | 0.083 | 1.152 | 0.0115 |
| 1 lbf.ft = | 135.6 | 1.356 | 192 | 12 | 1 | 13,83 | 0.138 |
| 1 kgf.cm = | 9.807 | 0.098 | 13.89 | 0.868 | 0.072 | 1 | 0,01 |
| 1 kgf.m = | 980.7 | 9.807 | 1389 | 86.8 | 7.233 | 100 | 1 |
4. Some real images of typical force tools
4.1. Torque Wrench (Tohnichi Torque Wrench)
4.2 Overview of tohnichi tools distributed by Semiki:
Reference link: SEMIKI
SEMIKI MEASUREMENT EQUIPMENT COMPANY LIMITED
Phone: +84 28 2253 3522
Email: sales@semiki.com
Hotline: +84 9797 61016