This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel tape measures. This standard applies to various types of steel tape measures for general length measurement purposes. QB/T 2443-1999 Steel tape measures QB/T2443-1999 Standard download decompression password: www.bzxz.net
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel tape measures. This standard applies to various types of steel tape measures for general length measurement purposes.

QB/T 2443—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 GB10633--1989 "Steel Ruler" was changed to an industry standard (this standard was issued by the State Light Industry Bureau [1999] No. 112 and converted to QB/T3859-1999, the content is the same as before). The main contents of this revision are: in terms of product specifications, the width of the tape measure has been appropriately expanded, and the thickness has been modified accordingly. In terms of product technical requirements, the straight length and line scale of the tape have been appropriately adjusted and modified according to actual needs, and have been improved on the original basis, approaching the international level. In terms of inspection rules, on the basis of ensuring the improvement of product quality qualification rate, various regulations have been appropriately adjusted.
This standard was revised with reference to the relevant requirements of the International Organization of Legal Metrology (OIML) No. 35 International Recommendation "Common Length Measuring Tools".
This standard cancels the "Appendix A\| Grade Steel Tape Indication Error" in the original GB10633-1989. This standard will replace QB/T3859-1999 from the date of implementation. 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 drafting units of this standard are: Shanghai Tool Industry Research Institute, Shanghai Tape Factory, Ningbo Changcheng Precision Tape Manufacturing Co., Ltd., and Guangdong Zhanhua Tools Co., Ltd.
The main drafters of this standard are: Yang Hanlin, Chen Lihai, Cheng Yongfeng, Liu Futing, and Weng Yinchu. 727
1 Scope
Light Industry Industry Standard of the People's Republic of China
QB/T 2443-—1999
Replaces QB/T3859-1999
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of steel tape measures. This standard applies to various types of steel tape measures for general length measurement purposes. 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 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/F228-—1987Methods for tensile testing of metalsGB/T699—1988
Technical conditions for high-quality carbon structural steel
GB/T 700--1988
3Carbon structural steel
GB/T 1720—1979
Determination of adhesion of paint film
GB/T 1731 --1993
GB/T 2828-1987
GB/T 4342—1991
GB/T 5305-1985
GB5938—1986
GB 59441986
Determination of flexibility of paint film
Batch inspection Count sampling procedure and sampling table (applicable to inspection of continuous batches) Metal micro-Vickers hardness test method
Manual packaging, marking, transportation and storage Test method for corrosion resistance of metal coatings and chemical treatment layers of light industrial products Evaluation of corrosion test results of metal coatings on light industrial products GB/T 12672--1990 Acrylonitrile-Butadiene-Styrene (ABS) Resin 3 Product Classification
3.1 Type
Neutral Salt Spray Test (NSS) Method
Steel tapes are divided into four types: A, B, C, and D according to different structures, as shown in Figures 1 to 4. Steel tapes are allowed to have attachments, but the attachments should not change the type of steel tapes and affect their measurement accuracy. 3.2 Specifications
Specifications are shown in Table 1.
Type A, B
Type C, D
Integer multiples of 0.5
Integer multiples of 5
4~~25
1) Special specifications and requirements are negotiated by both parties. 2) The width and thickness of the tape refer to the width and thickness of the Goldwind material. Approved by the State Bureau of Light Industry on May 6, 1999
Width deviation
0.12～0.14
0.14~0.24
Thickness deviation
Arc or flat
Implemented on December 1, 1999
QB/T2443—1999
1—ruler hook; 2-rivet; 3-ruler tape, 4-ruler box Figure 1A type (self-winding)
1—ruler hook; 2—rivet: 3—ruler tape; 4-ruler box 5—brake Button; 6-turntable; 7-ruler spring
Figure 2B type (self-winding brake type)
1-screw; 2-ruler box; 3-crank handle, 4-ruler tape, 5-nail; 6-pull ringFigure 3C type (rolling box type)
4 Technical requirements
4.1 Materials
QB/T2443—1999
1-handle; 2-crank handle 3-nail; 4-ruler frame; 5-ruler tape; 6-turntable = 7-heavy bodyFigure 4D type (rolling frame type)
4.1.1 Materials for main parts are shown in Table 2.
Part name
Material name
Xutong carbon steel
Engineering plastics
High-quality carbon steel
Standard number
GB/T 700
GB/T 12672
When other materials are selected
, their main properties should not be
GB/T 699
The weight of the oil dipstick should be made of non-ferrous metal, and the ruler frame should be made of non-ferrous metal or non-metallic material. 4.1.2
4.2 Indication error
The indication error from the zero point to any line shall comply with the following provisions: Level I: 4=±(0.1+0.1XL)
Level I: 4=±(0.3+0.2XL)
Formula: 4-
Indication error, mm;
Length value, m.
Note: When the length is not an integer multiple of meters, L shall be the nearest larger integer number of meters. Lower than the requirements of specified materials
4.2.2 For the tape with zero starting end face (as shown in Figure 5), the absolute value of the allowable error of the indication of the interval length from one end face of the tape to any line pattern can be increased:
For grade 1 tape: 0.1mm
For grade 2 tape: 0.2mm
QB/T 2443—1999
4.2.3 The maximum allowable error between any two consecutive millimeter or centimeter divisions is shown in Table 3. Table 3
Graduation value;
<≤10
4.3 Hardness
Maximum allowable error of accuracy grade
After heat treatment, the hardness of the ruler is: 449HV0.2~~620HV0.2, or the tensile strength is: 1.499kN/mm2~2.158kN/After heat treatment, the hardness of the ruler spring is: 561HV0.2~~688HV0.2, or the tensile strength is: 1.919kN/mm2~2.448kN/The straightness of the ruler side is specified in Table 4.
degrees, m
The straight length of the arc ruler is specified in Table 5.
10～<16
16～<19
19～<25
Note: If the width of the tape is less than 10mm, the straight length is not specified. 4.6 Tape lines
Straightness tolerance
Not more than 1/500 of the length
Not more than 6mm
Any 5m length should not be more than 6mm
Straight length L
≥700
≥1000
≥1200
≥1500
4.6.1 All lines of the tape must be clearly drawn and vertical to the edge. The lengths of millimeters, 5mm, centimeters and decimeters should be clearly distinguished. The width of the lines can be different. The numbers and marks must be clear and correct, as shown in Figure 5. Zero point
mlmmmmmmam
a) The inner side of the fixed ruler hook is the zero point end
02L5ml3
Eanmmaaln
naunimnl
b1) When the movable ruler hook is pulled out, the inner side of the ruler hook is the zero point end Figure 5
QB/T2443--1999
QQ 2 [5m/ 3
anmnalmiulu uhiuuanam lanauualb2) When the movable ruler hook is retracted, the outer side of the ruler hook is the zero point end.
>100mm
c) The printed zero point is the zero point end
d) The inner side of the pull ring is the zero point end
e) The bottom of the weight body is the zero point end
Figure 5 (end)
The line width is shown in Table 6.
Line width,mm
0.15~0.50
The difference in width of the same type of tape
shall not exceed 20% of the maximum width of the tape
4.6.3When the tape is pulled out to its full length, the distance between the nominal length end line and the opening of the tape box: Grade I
shall not exceed 30% of the maximum width of the tape
Type A, Type B ≥50mm; Type C, Type D
≥150mm
4.6.4Extension scales are allowed before and after the nominal length scale lines of Type C and Type D tapes, but such scales are not required to indicate values, and there shall be a zero point indication mark before the zero point line.
4.7 Tape Covering
4.7.1The surface of nickel-plated and chromium-plated tapes shall be free of defects such as peeling and rust. 4.7.2 The corrosion resistance level of the electroplated ruler shall not be lower than level 3 after the neutral salt spray test. 4.7.3 The surface of the coated ruler shall be smooth, firm and uniform in color. 732
QB/T2443-—1999Www.bzxZ.net
4.7.4 The thickness of the bidirectional coating on the surface of the coated ruler shall not be lower than 15um. 4.7.5 The coating adhesion shall not be lower than level 3 after measurement. 4.7.6 The coating flexibility shall not be free of reticulation, cracks and peeling after measurement. 4.8 Surface quality of ruler box
4.8.1 The stamping font of the metal ruler box shall be clear and complete. 4.8.2 The covering layer of the ruler box shall be uniform in color, smooth and free of rust. 4.8.3 The corrosion resistance level of the electroplated metal ruler box shall not be lower than level 5 after the neutral salt spray test. 4.8.4 The surface of the plastic ruler box shall be uniform in color, smooth and complete. 4.9 Assembly
The assembled tape measure must be firm, the tape must be flexible, and the self-winding brake should be reliable. 5 Test method
5.1 The width and thickness of the tape side are checked with a general measuring tool (the arc-shaped tape is unfolded for inspection). 5.2 The hardness test is carried out in accordance with GB/T4342, and the tensile strength test is carried out in accordance with GB/T228. Only one of the two tests needs to be carried out. 5.3 Indication error
5.3.1 The indication error of the tape with grade I accuracy should be checked at (20±5)℃, and the indication error of the tape with ear-level accuracy should be checked at (20±8)℃.
5.3.2 When checking the indication error of the tape, place the tape horizontally on the inspection table and compare it with the standard ruler from the zero point of the line. The indication error of the standard ruler should be less than 1/5 of the indication error of the ruler being checked. 5.3.2.1 The tape with hook and pull ring shall be checked by comparing it with the standard ruler. 5.3.2.2 The tape with weight body shall be checked by comparing it with the standard ruler. 5.3.3 Inspection of rolling tape
The tension of rolling steel tape shall be 50N (100N may be used for special needs, but it must be indicated on the calibration certificate). 5.4 The straightness inspection of tape side is shown in Figure 6, which shall comply with the provisions of Table 4. 6
1 Tape side; 2 Standard ruler side
5.5 When checking the straight length of arc tape, pull it out slowly horizontally with the concave side facing up, as shown in Figure 7, which shall comply with the provisions of Table 5. 200
1-Rule box; 2--Tape; 3-Inspection table
5.6 The line width shall be checked with a reading microscope with a minimum graduation value of 0.01mm. 733
Coating layer test
5.7.1 The electroplated ruler tape shall be subjected to 8h anti-rust test.
5.7.2 The electroplated ruler box shall be subjected to 24h anti-rust test. QB/T2443—1999
5.7.3 The anti-rust test shall be carried out in accordance with GB5938. The evaluation of the test results shall be carried out in accordance with GB5944. 5.7.4 The thickness of the coating layer shall be checked with a thickness gauge. 5.7.5 The adhesion of the paint film shall be measured in accordance with GB/T1720. 5.7.6 The flexibility of the paint film shall be measured in accordance with GB/T1731. 6 Inspection rules
6.1 Products may only leave the factory after passing the inspection, and shall be accompanied by a product certificate and the adopted standard number shall be written in it. 6.2 The acceptance inspection of products shall be carried out in accordance with the sampling plan of GB/T2828. The classification of unqualified products, inspection items, acceptable quality level (AQI) (number of unqualified products per 100 units of products) and inspection level (IL) shall be carried out in accordance with Table 7. Table 7
Unqualified classification
Inspection items
Indication error4.2
Correct marking4.6.1
Even and clear lines4.6.1
Coating layer of tape4.7
Flexible extension of tape4.9
Straightness4.4
Straight length4.5
Obvious marking4.6.1
Line width4.6.3
Surface quality of ruler box4.8
6.3 After passing the inspection, the unqualified products found in the inspection shall be replaced. Acceptable quality level (AQL)
6.4 Products rejected after inspection may be re-arranged by the manufacturer and then submitted for acceptance. 7 Marking, packaging, transportation, storage
7.1 Grade marking
7.1.1 The grade mark shall be printed on the blank space at the head of the tape for grade 1 tape measure, and no mark shall be made for grade Ⅱ. 7.1.2 The grade shall be indicated on the certificate of conformity.
7.2 The manufacturer's name, registered trademark, specifications, model and legal metrological symbols shall be indicated on the product. 7.3 Packaging, marking, transportation and storage shall comply with the provisions of GB/T5305. 734
Inspection level (IL)6 The flexibility of the paint film shall be measured in accordance with GB/T1731. 6 Inspection rules
6.1 Products can be shipped only after they have passed the inspection. They must be accompanied by a product certificate and the adopted standard number must be written in it. 6.2 The delivery inspection of products shall be carried out in accordance with the one-time sampling plan of GB/T2828. The classification of unqualified products, inspection items, qualified quality level (AQI) (number of unqualified products per 100 units of products) and inspection level (IL) shall be carried out in accordance with Table 7. Table 7
Classification of non-conforming
Inspection items
Error of indication4.2
Correct marking4.6.1
Even and clear lines4.6.1
Coating layer of tape4.7
Flexible extension of tape4.9
Straightness4.4
Straight length4.5
Obvious marking4.6.1
Line width4.6.3
Surface quality of ruler box4.8
6.3After passing the inspection, the non-conforming products found in the inspection shall be replaced. Acceptable quality level (AQL)
6.4 Products rejected after inspection may be re-arranged by the manufacturer and then submitted for acceptance. 7 Marking, packaging, transportation and storage
7.1 Grade marking
7.1.1 The grade mark shall be printed on the blank space at the head of the tape for grade I tape measures, and no mark shall be made for grade II tape measures. 7.1.2 The grade shall be indicated on the certificate of conformity.
7.2 The manufacturer's name, registered trademark, specifications, model and legal metrological symbols shall be indicated on the product. 7.3 Packaging, marking, transportation and storage shall comply with the provisions of GB/T5305. 734
Inspection level (IL)6 The flexibility of the paint film shall be measured in accordance with GB/T1731. 6 Inspection rules
6.1 Products can be shipped only after they have passed the inspection. They must be accompanied by a product certificate and the adopted standard number must be written in it. 6.2 The delivery inspection of products shall be carried out in accordance with the one-time sampling plan of GB/T2828. The classification of unqualified products, inspection items, qualified quality level (AQI) (number of unqualified products per 100 units of products) and inspection level (IL) shall be carried out in accordance with Table 7. Table 7
Classification of non-conforming
Inspection items
Error of indication4.2
Correct marking4.6.1
Even and clear lines4.6.1
Coating layer of tape4.7
Flexible extension of tape4.9
Straightness4.4
Straight length4.5
Obvious marking4.6.1
Line width4.6.3
Surface quality of ruler box4.8
6.3After passing the inspection, the non-conforming products found in the inspection shall be replaced. Acceptable quality level (AQL)
6.4 Products rejected after inspection may be re-arranged by the manufacturer and then submitted for acceptance. 7 Marking, packaging, transportation and storage
7.1 Grade marking
7.1.1 The grade mark shall be printed on the blank space at the head of the tape for grade I tape measures, and no mark shall be made for grade II tape measures. 7.1.2 The grade shall be indicated on the certificate of conformity.
7.2 The manufacturer's name, registered trademark, specifications, model and legal metrological symbols shall be indicated on the product. 7.3 Packaging, marking, transportation and storage shall comply with the provisions of GB/T5305. 734
Inspection level (IL)
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