QB/T 2440.4-1999 Torsion pliers, water pump pliers

QB/T 2440.4-1999 Torsion Pliers Water Pump Pliers QB/T2440.4-1999 Standard Download Decompression Password: www.bzxz.net

QB/T2440.4--99
Classification No. J47
Registration No. 2941-1999
This standard is based on the requirements of the State Bureau of Technical Supervision to clean up and rectify national standards, and the original national standard GB6293.4-86 "Twist Pliers and Water Pump Pliers" was changed to an industry standard (this standard was issued by the State Light Industry Bureau [19991112 Document] and converted to QB/T3851.4-99, the content is the same as before). This standard is based on the original national standard GB6293.4-86, and is formulated with reference to the international standard ISO8976:1988 "Twist Pliers and Shearing Pliers--Dimensions and Test Values ​​of Water Pump Pliers". This standard was 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. This standard was drafted by the Shanghai Tool Industry Research Institute, and the Red Star Knife and Scissors Factory in Wuxi, Jiangsu Province participated in the drafting. The main drafters of this standard are Lin Meide and Wu Jinliang. From the date of implementation of this standard, the original national standard GB6293.4-86 "Twist Pliers and Water Pump Pliers" shall be abolished. 12
Light Industry Standard of the People's Republic of China
Twist Pliers and Water Pump Pliers
This standard adopts the international standard ISO8976:1988 "Twist Pliers and Shearing Nippers-Values".
1 Scope
This standard specifies the product classification, technical requirements and test methods of water pump pliers. QB/T2440.4-99
Replaces QB3851.4-99
Dimensions and test numbers of water pump pliers
This standard applies to water pump pliers. When there are special requirements for the product, it is not restricted by this standard. 2 Referenced 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 all valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version 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 types of water pump pliers are shown in Figures 1 to 3. And according to the jaw structure, they are divided into three types: sliding pin type, sample groove stacking type and jaw insertion type.
Figure 1 Type A water pump pliers (sliding pin type)
Approved by the State Bureau of Light Industry on May 6, 1999
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Implemented on December 1, 1999
QB/T2440.4—99
Figure 2 Type B water pump pliers (sample groove stacking type)
3.2 Basic dimensions
The basic dimensions of water pump pliers shall be as specified in Table 1.
Figure 3 Type C water pump pliers (jaws inserted type)
Table 1 Basic dimensions
Overall length L
100±5
120±6
140±7
160±8
180±9
200±10
225±11
250±12
300±15
350±20
400±20
500±20
Maximum head thickness
Minimum jaw adjustment dimension G
Note: If the user has other requirements for the size, it can be determined by agreement. 3.3 Marking example
Minimum number of adjustment gears
The marking of the product shall consist of the product name, specification, model code and standard number. Marking example of 200mm sliding pin type water pump pliers: Water pump pliers 200mmAWww.bzxZ.net
4 Technical requirements
4.1 Bending strength
QB/T2440.4-99
The bending strength of water pump pliers must comply with the provisions of Table 2. 4.2 Clamp head
Minimum jaw length L
The clamp head shall be able to close or open flexibly, and shall not be too lateral at any position to affect the use of power 14
QB/T2440.4-99
When the water pump pliers are closed, the jaws shall not have a reverse cone phenomenon. 4.4 Other technical requirements
Other technical requirements for water pump pliers shall comply with the provisions of GB/T6290. 2
Test method
Table 2 Bending strength
Load F
The test method for water pump pliers shall comply with the provisions of GB/T6291. 15
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Maximum permanent deformation Smax
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