GB/T 4393-1995 Technical specification for open-end wrenches, box spanners and combination wrenches GB/T4393-1995 standard download decompression password: www.bzxz.net

Standard".
National Standard of the People's Republic of China
Open-end wrenches ,box wrenches and combination wrenches--Technical specifications GB/T4393—1995
Replaces GB4393-84
GB 4394—84
This standard adopts the international standard ISO1711:1975 "Assembly tools for screws and nuts--Technical specifications for hand-held wrenches and sockets 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of open-end wrenches, box wrenches and combination wrenches.
This standard applies to open-end wrenches, box wrenches and combination wrenches. Reference standards
GB/T230Metal Rockwell hardness test method
Smooth limit gauge
GB 1957
GB2828Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection)GB4955Metal coating thickness determination Anodic dissolution Coulometric methodGB/T5305Packaging, marking, transportation and storage of hand toolsGB5936Test method for chemical protective layer of ferrous metals in light industrial products Diffuse drop method Microscopic measurement method for cross-sectional thickness of metal and oxide coatingsGB 64623
3Technical requirements
3.1Material
Use carbon structural steel or alloy steel that can meet the requirements of this standard. 3.2Hardness
The hardness of the wrench shall be as specified in Table 1.
Approved by the State Administration of Technical Supervision on October 24, 1995, and implemented on July 1, 1996
3.3 Torque
Alloy steel
GB/T4393--1995
Solid-type wrench
3.3.1 The wrench shall be able to withstand the torque specified in Table 2. 3.3.2 The torque of the A series and B series in Table 2 shall be used for the ring spanner. 3.3.3 The torque of the C series and D series in Table 2 shall be used for the fixed-purpose wrench. Degree
Alloy steel
3.3.4 The open end and hole end of the combination wrench shall adopt the torque series of the fixed-purpose wrench and the ring spanner respectively. Table 2
A series
kgf·m
B series
kgf·m
C series
kgf·m
Plum wrench
39~~48
D series
kgf·m
A series
kgf·m
GB/T 4393-1995
Continued Table 2
B Series
kgf·m
C Series
kgf·m
D Series
kgf·m
A Series
kgf·m
3.4 ​​Symmetry between opening and head width
GB/T4393--1995
Continued Table 2
B Series
kgf·m
C Series
The symmetry between opening and head width, the deviation shall be in accordance with the provisions of Figure 1 and Table 3. kgf m
3.5 Surface treatment
D Series
kgf·m
The wrench shall be electroplated, blackened or subjected to other surface treatment. 3.5.1 The surface of the electroplated wrench should have uniform color, no defects such as pores, plating leakage, burning and delamination, and the coating thickness should not be less than &μm.
3.5.2 The surface of the blackened wrench should have a uniform black oxide layer, no yellow, green, red spots and bottom exposure. 3.6 Surface quality
3.6.1 The Ra value of the surface roughness of the two sides of the wrench opening shall not be less than 12.5μm. The Ra value of the surface roughness of the wrench hole shall not be less than 26
25μm.
GB/T4393-1995
3.6.2 The wrench should not have cracks, burrs, obvious gaps, cuts, oxide scale and other defects, and the handle should be straight. 4 Test method
4.1 Surface quality inspection
The surface quality of the wrench is visually inspected.
4.2 Dimension inspection
4.2.1 The external dimensions are inspected with universal measuring tools. 4.2.2 The spanner opening accuracy is inspected with limit gauges [see Appendix A (Supplement)]. 4.2.3 The spanner hole accuracy is inspected with hexagonal limit gauges [see Appendix A (Supplement)]. 4.3 Symmetry inspection of spanner opening
The symmetry of spanner opening is inspected with special measuring tools. 4.4 Hardness test
4.4.1 The hardness test shall be carried out in accordance with the provisions of GB/T230. 4.4.2 The test position of the fixed spanner is shown in Figure 2. 272
4.4.3 The test position of the box spanner shall be near the head and neck of the handle. 4.5 Torque test
4.5.1 The torque test shall be conducted using a hexagonal test bar, whose hardness shall not be less than HRC55 and whose tolerance code is h8.4.5.2 The torque test shall be conducted using the method shown in Figures 3 and 4, with slow loading. When the load reaches the rated value, the load shall be removed after 30 seconds of maintenance. When the fixed wrench is tested, the test bar shall touch the bottom of the wrench. When a torque testing machine with rotating test bar is used, the torque accuracy is ±2.5%. Load
Test bar fixed
Test tip rotates
Figure 3 Torque test of fixed wrench
Test bar fixed
GB/T4393—1995
Test bar rotates
Figure 4 Torque test of plum wrench
4.5.3 After the torque test, the deformation of the wrench opening end shall not exceed the provisions of Table 4. Table 4
4.6 Inspection of surface treatment
4.6.1 The thickness of the electroplating layer shall be inspected in accordance with the provisions of GB4955. For the electroplating layer that cannot be inspected by this method, it shall be inspected in accordance with the provisions of GB6462.
4.6.2 The inspection of the blackened layer shall be carried out in accordance with the provisions of GB5936 after the oil stains on the wrench are removed. 5 Inspection rules
5.1 Products shall be shipped only after they have passed the inspection and shall be accompanied by a product certificate. 5.2 The inspection of products shall be carried out item by item according to the secondary sampling plan specified in GB2828. 5.3 The sample may consist of wrenches of the same specifications or of wrenches of different specifications in a set of products. 5.4 The classification of unqualified products, inspection items, qualified quality level AQL (number of unqualified products per 100 units of products) and inspection level IL of the acceptance test shall be in accordance with the provisions of Table 5.
Classification of non-conformity
Inspection items
Accuracy of openings and holes
Basic size
Coating thickness
Surface treatment
Surface quality
Acceptable quality level AQL
Inspection level IL
5.5 Samples should be randomly selected from the batch submitted for inspection. When convenient, it is best to divide the entire batch of products into several small batches or parts according to some reasonable method, and then randomly select from each small batch or part in proportion to the total sample size according to the percentage of each part in the entire batch. When using a secondary sampling plan, each sample must be randomly selected from the entire batch. 28
GB/T 4393-1995
The time for sampling can be during the formation of the batch or after the batch is formed. Determination of acceptance inspection qualification
6.1 The acceptance inspection qualification shall be determined in accordance with Article 4.11 of GB2828. 6.2 The manufacturer shall replace the unqualified products found in the acceptance inspection and the samples after the destructive test. 6.3 The products rejected after inspection may be reclassified or repaired by the manufacturer before submission for acceptance. Packaging, marking, transportation and storage
Under normal storage conditions, the anti-rust period of the product is one year. Its packaging, marking, transportation and storage shall comply with the provisions of GB/T5305. 29
GB/T4393--1995
Appendix A
Inspection gauge for spanner opening and spanner hole
(Supplement)
A1 The shape of the inspection gauge is shown in Figure A1 and Figure A2. S
Gauge for spanner opening
e=1.135S(min)
Figure A2 Gauges for wrench holes
The accuracy of gauges for wrench openings shall be as specified in Table A1Table A1
Opposite side dimensions
10~11
Lower deviation
Upper deviation
Approximately IT grade
Gauge accuracy
Opposite side dimensions
34~~50
Lower deviation
GB/T4393-1995
ContinuedTable A1
Upper deviation
A3The accuracy of gauges for wrench holes shall be as specified in Table A2. Gauge
Opposite side dimension
Lower deviation
Upper deviation
About IT grade
About IT gradewwW.bzxz.Net
Gauge accuracy
Gauge accuracy
Opposite side dimension
75~~80
Lower deviation
GB/T 4393--1995
Continued table A2
Upper deviation
A4Technical requirements for inspection gauges shall comply with the provisions of GB1957. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Tool Hardware Standardization Center. About IT grade
Gauge accuracy
This standard is drafted by the First Working Group of the Tool Hardware Sub-Technical Committee of the National Technical Committee for Hardware Products Standardization. The main drafters of this standard are Lin Meide, Zhou Yanmou and Xue Guijuan. This standard was first issued on May 14, 1984. This standard was second issued on October 24, 1995. 32
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