QB/T 2440.3-1999 Twist Pliers Round Nose Pliers QB/T2440.3-1999 Standard Download Decompression Password: www.bzxz.net

QB/T2440.3-1999
This standard is based on the requirements of the State Administration of Quality and Technical Supervision to clean up and rectify national standards. The original national standard GB6293.31986 "Twist Pliers Round Nose Pliers" was changed to an industry standard (this standard was issued by the State Light Industry Bureau [1999] No. 112 document and converted to QB/T3851.3--1999, the content is the same as before). This standard is based on the original national standard GB6293.3--1986, and refers to the international standard ISO5745:1988 "Twist Pliers and Shearing Pliers-Twist Pliers Dimensions and Test Values", and cancels the "A" and "B" classification of the bending strength of the pliers handle in the original national standard. From the date of implementation, this standard will replace GB6293.3--1986. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the National Tool Hardware Standardization Center. The responsible drafting unit of this standard is Shanghai Tool Industry Research Institute, and the participating drafting units are Beijing Telecom Tool Factory, Jiangsu Jinlu Group Corporation, Zhangjiagang Zhongxin Hardware Tools Co., Ltd., etc. The main drafters of this standard are Lin Meide, Wang Rujie, Shao Xuehai, and Huang Yongxiang. 702
Light Industry Standard of the People's Republic of China
Pliers
Round Nose Pliers
QB/T 2440.3-1999
Replaces QB/T3851.3—1999
This standard refers to the international standard ISO5745:1988 "Pliers and Shears-Pliers Dimensions and Test Values". 1 Scope
This standard specifies the product classification, technical requirements, and test methods of round nose pliers. This standard applies to round nose pliers. When there are special requirements for the product, it is not limited by this standard. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T6290-1999 General technical conditions for twist pliers and shearing pliers GB/T6291--1999 Test methods for twist pliers and shearing pliers 3 Product classification
3.1 Type
The type of round-nose pliers is shown in Figure 1.
uu (Newton s)
Figure 1 Type of round-nose pliers
3.2 Basic size
The basic size of round-nose pliers shall be as specified in Table 1.
Approved by the State Bureau of Light Industry on May 6, 1999
Implemented on December 1, 1999
125±6
140±7
160±8
180±9
200±10
QB/T2440.3—1999
Basic dimensions
Note: If the user has other requirements for the dimensions, they can be determined through negotiation. 3.3 Marking example
The marking of the product shall consist of the product name, specification and standard number. Marking example of 125mm round-nose pliers:
Round-nose pliers 125mm2QB/T2440.3--1999. 4 Technical requirements
4.1 Bending strength
The bending strength of round-nose pliers must comply with the requirements of Table 2. Table 2 Bending strength
4.2 TorquewwW.bzxz.Net
The torque of round-nose pliers must comply with the provisions of Table 3. L
Table 3 Torque
Cutting load F
Torque T
Permanent deformation Smx
Maximum torsion angle αimax
4.3 Dome gap
QB/T2440.3-—1999
The maximum value of the top gap of round-nose pliers in the area not more than 3mm from the top of the mouth should not exceed 0.08mm. 4.4 Other technical requirements
Other technical requirements of round-nose pliers shall comply with the provisions of GB/T6290. 5 Test method
The test method of round-nose pliers shall comply with the provisions of GB/T6291. 705
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