JSA JIS B 7512-2016 Stell Measure Tape [PDF]

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JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association



JIS B 7512



:2016



(JMIF/JSA)



Steel tape measures



ICS 17.040.01 Reference number: JIS B 7512 : 2016 (E) PROTECTED BY COPYRIGHT



8 S



B 7512 : 2016



Date of Establishment: Date of Revision:



1957-03-29



2016-12-20



Date of Public Notice in Official Gazette: Investigated by:



2016-12-20



Japanese Industrial Standards Committee Standards Board for ISO area Technical Committee on Basic Engineering



JIS B 7512 : 2016, First English edition published in 2017-03 Translated and published by: Japanese Standards Association Mita MT Building, 3-13-12, Mita, Minato-ku, Tokyo, 108-0073 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. © JSA 2017 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.



Printed in Japan



HT/HN



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B 7512 : 2016



Contents



Page



1



Scope ...................................................... ···········································1



2



Normative references············································································ 1



3



Terms and definitions ........................................................................... 1



4



Classification and grading ..................................................................... 3



5



Nominal size ...................................................... ·································3



6 6.1



Performance ........................................................................................ 3 Tolerances on length ............................................................................ 3



6.2 6.3



Standout ability··················································································· 3 Straightness of scale side face································································ 3



7



Graduation ......................................................................................... 4



8



Appearance and construction ................................................................. 6



9



Materials···························································································· 7



10



Measuring methods·············································································· 8



11



Inspection ........................................................................................... 9



12



Designation· ........................................................................................ 9



13



Marking ........................................................................................... ·10



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B 7512 : 2016



Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee as the result of proposal for revision of Japanese Industrial Standard submitted by Japan Measuring Instruments Federation (JMIF)/Japanese Standards Association (JSA) with the draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Consequently JIS B 7512:2005 is replaced with this Standard. However, JIS B 7512: 2005 may be applied in the JIS mark certification based on the relevant provisions of Article 19 Clause 1, etc. of the Industrial Standardization Law until June 19, 2017. This JIS document is protected by the Copyright Law.



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Attention is drawn to the possibility that some parts of this Standard may conflict with patent rights, applications for a patent after opening to the public or utility model rights. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying any of such patent rights, applications for a patent after opening to the public or utility model rights.



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JAPANESE INDUSTRIAL STANDARD



JIS B 7512 : 2016



Steel tape measures 1



Scope



This Japanese Industrial Standard specifies steel tape measures of nominal sizes 0.5 m to 200 m (hereafter referred to as tape measures). 2



Normative references



The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. JIS B 7516



Metal rules



JIS G 4305



Cold-rolled stainless steel plate, sheet and strip



JIS G 4401



Carbon tool steels



JIS Q 17025 General requirements for the competence of testing and calibration labora tories JIS Z 8103 3



Glossary of terms used in measurement



Terms and definitions



For the purposes of this Standard, the terms and definitions given in JIS Z 8103, and the following apply.



3.1



reference point



the centre line of graduation line or the end face to be taken as the reference of measurement (see Figure 1) 3.2



effective measuring range



the range from the reference point to the graduation line which expresses the nominal SIze



The tolerances on length are applicable to the scales in this range. 3.3



extended scale, margin scale



scales outside the effective measuring range The tolerances on length are not applicable to these scales. 3.4



margin



portion of the tape outside the effective measuring range The margin up to the graduation line indicating the reference point is called top margin, and the margin from the graduation line indicating the nominal size is called



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The names of the respective parts of tape measure are given in Figure 1.



2



B 7512 : 2016



end margin (see Figure 1).



3.5



scale spacing



the length between two adjacent graduation lines, obtained by measurelng the centre-to-centre distance



3.6



scale interval 1)



magnitude of measuring amount corresponding to the scale spacing Note



3.7



The scale interval mentioned here is an abstract idea.



1)



hook ring



ring attached to the tip of tape Reference point



point



Extended scale Effective measuring range



Extended scale End margin



Tape



a)



Wide tape measure and narrow tape measure



Reference point



b)



Tank tape measure



~HOOk



I



I::::::::::::::::::::::::::::::::::::::::::::::::::::::::\\\.u:..I.L.::.:::L.I..¥lo ... _ _ _ _ _



.....I



Reference point (for measurement by hooking, inside end face of hook) Reference point (for measurement by butting the movable hook, outside end face of hook)



c) NOTE:



Convex rule and narrow tape measure



These drawings are intended only for indicating the names of respective parts and not intended for specifying the shape and construction.



Figure 1 Names of respective parts



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3 B 7512 : 2016



4



Classification and grading



Tape measures shall be classified as given in Table 1 according to the construction, application or other conditions. They shall be divided into Grades 1 and 2 according to the tolerance on length.



5



Nominal size



The nominal size of tape measures shall be expressed by the maximum scale value of effective measuring range, as given in Table 1 according to the type.



Table 1 Type Tank tape measure Wide tape measure Narrow tape measure Convex rule



6 6.1



Classification and nominal size



Nominal size Integer multiple of 5 m (5 m to 200 m)



Integer multiple of 0.5 m



0.5 m to 3 m 0.5 m to 30 m



Construction and application Tape measure having a weight at the end of tape, to be used for measurement of the depth of liquid in a tank and the depth of hole Tape measure to be used for general survey and measurement Pocket-sized tape measure using narrow tape Tape measure with long standout length having curved cross-sectional shape



Performance Tolerances on length



When measured in accordance with Table 9 a), tolerances on length from the reference point and length between two arbitrary graduation lines shall comply with the following formulae. In the case of tape measure whose reference point is located on its end face, the tolerance on length from the reference point shall be obtained by adding 0.2 to the value given by the following parenthesized formulae. Grade 1:



± (0.2 + 0.1 L) mm



Grade 2:



± (0.25 + 0.15 L) mm



where, L is the measured value in metres (rounding up the fraction less than 1 to an integer place), which has no unit. For the tolerance for Grade 2, round up the second decimal place of the value obtained from this formula. 6.2



Standout ability



The convex rules of tape width 13 mm or over shall not be bent under their own weight per length at least 50 times the tape width when its standout ability is tested in accordance with Table 9 b).



6.3



Straightness of scale side face



The straightness of the scale side face in the horizontal direction shall meet the requirements of Table 2 when it is tested in accordance with Table 9 c).



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4 B 7512 : 2016



Table 2 Nominal size 3 m or under Over 3 m up to and incl. 5 m Over 5 m



7



Straightness



Straightness Steel Stainless steel 11500 max. of the nominal size 11500 max. of the nominal size 6 mm max. for nominal size 6 mm max. for arbitrary 5 m



10 mm max. for arbitrary 5 m



Graduation



a)



One end of the graduation line shall not be located 0.5 mm or over apart from the scale side face.



b)



The reference point shall be located on a graduation line or end face. For a convex rule and narrow tape measure whose reference point is on the end face, the attachment of hook, measuring method and positioning of reference point shall be as given in Table 3. For a convex rule which is graduated on both faces (concave and convex surfaces), the reference point and nominal size shall be as given in Table 4.



Table 3



Reference points of convex rules and narrow tape measure with the end face as the reference point



Attachment of hook Hook is fixed to the tape so that it does not move (fixed hook) Hook is attached to the tape so that it is movable (movable hook)



Measuring method Measurement by hooking the inside end face of the hook on the measured object (hooking measurement) Measurement by hooking the inside end face of the hook on the measured object (hooking measurement) Measurement by butting the outside end face of hook on the measured object (butting measurement)



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Reference point Inside end face of hook [Figure 2 a)]



Inside end face of hook [Figure 2 b) and d)]



If movement length of hook corresponds to the thickness of hook, the outside end face of hook [Figure 2 c)] If movement length of hook corresponds to the thickness of hook, the end face of tape [Figure 2 e)]



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The graduation of tape measures shall be as follows.



5 B 7512 : 2016 Reference point



a)



Fixed hook, hooking measurement



I~: i: :i:l:i: : ~: : : :~: : : :}r b)



Movable hook, hooking measurement



Reference point



fi: ~: : : :~: : : :1: : : :~: : : :~: : : }r c)



,i i:l: : i: :i: : : :~: : : :~; d)



i: ~: : : :~: : : :~: : : :~: : ](



Movable hook, hooking measurement



NOTE:



Movable hook, butting measurement Reference point



e)



Movable hook, butting measurement



These drawings a) to e) are intended to indicate the position of reference point, and not intended to specify the appearance, shape, construction and other elements.



Figure 2



Table 4 Reference point



Reference points of convex rules and narrow tape measure with the end face as the reference point



Reference point and nominal size of convex rule with double·sided scale



Concave face Convex face



Nominal size



End face (see Figure 3) Either of the following (see Figure 3) a) End face b) A graduation line having a top margin of L cm (L is an integer value) from the end face. The deviation of this reference point shall be within ±O.4 mm from the graduation line of Lcm on the concave surface. The nominal size of both sides shall be identical. The marking of nominal size, etc. may also be made on either of two sides. Top margin



©© Lcm Lcm



(Reference point)Movable hook, butting measurement



Figure 3



Double·sided scale of convex rule and their reference points (an example setting L = 3)



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6 B 7512 : 2016 c)



The scale interval shall be 1 mm, 2 mm, 5 mm, 10 mm, 20 mm, 50 mm or 100 mm. It is permissible to have two or more scale intervals and use them in combination. However, the other scale intervals than the above shall not be given.



d) For a scale of the same interval, both the tolerance on scale spacing and the difference of spacing between two adjacent scales shall fall within the values as given in Table 5, except for the scale spacing from the end face reference point.



Table 5



Tolerance on scale spacing and difference of spacing between two adjacent scales



Scale interval i Tolerance on scale spacing and difference of spacing between two adjacent scales



i



Unit: mm 1 < i::;; 100 ±0.3



=1



±0.2



e)



The thickness of graduation lines shall be 0.1 mm to 0.5 mm, which may vary according to the type of graduation lines (1 mm line, 5 mm line, 10 mm line, etc.). For the gradual lines with the same nominal thickness, the minimum value of the actual thickness shall be at least 70 % of the maximum value.



D



Where extended scales are provided, their lengths shall be 1 000 mm or less in total of the top and end.



g)



The graduations shall be clear, and be free from defects detrimental to measurement such as distortions and discontinuities.



h) The principal graduation lines shall be marked with the length from the reference point or its numerical value.



8



Appearance and construction The appearance and construction of tape measures shall be as follows.



a) The marking and graduation lines shall be clear, indelible, and be free from defects detrimental to measurement such as missing and errors. b) Tape measures whose reference point is a graduation line shall be provided with a top margin having the length as given in Table 6 according to the type.



Table 6



Length of top margin



Type Wide tape measure Convex rule and narrow tape measure



c)



Unit: mm Length 150 min. 10 min.



For the end margin, the length from the opening of housing shall be as given in Table 7 according to the type.



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B 7512 : 2016



Table 7



Length of end margin



Type Wide tape measure and tank tape measure Convex rule and narrow tape measure



Nominal size 5m Over 5 m -



Length 50 mmmin. 200 mm min. 30 mmmin.



d) The thickness of tape coating films shall be 0.5 mm or less for one surface. e)



The hook ring, hook, weight and attaching metal fittings thereof shall be corrosion resistant and shall be attached appropriately.



f)



The mass of the weight for tank tape measures shall be 200 g to 2 kg, and the weight shall be marked with its mass. The tank tape measures with separable weight shall be marked with an identification number on each separable part.



g) The housing shall allow smooth extraction and retraction of the tape, and be robust.



9



Materials The materials of tape measure shall be as follows.



a) Quality and hardness The quality and hardness shall be, under the normal use conditions and for the purpose of normal use, in accordance with clause 6 and either of the following. 1)



SK 95 or SK 85 specified in JIS G 4401, or that of at least equivalent contents, having hardness 400 HV to 600 HV.



2)



SUS301 or SUS420J2 specified in JIS G 4305, or that of at least equivalent contents, having hardness 360 HV or over.



b) Dimensions The dimensional range of the width and thickness of material shall be as given in Table 8 according to the type of tape measure.



Table 8



Dimensional range of materials Unit: mm Thickness b) 0.10 to 0.40



Width a) Type Tank tape measure 10 to 15 Wide tape measure Narrow tape measure 4 to 8 0.08 to 0.12 Convex rule 4 to 50 0.08 to 0.40 Notes a) The tolerance on width shall be the dimension to be applied ±0.2 mm. b) The tolerance on thickness shall be ±20 % of the dimension to be applied.



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8 B 7512 : 2016



10



Measuring methods



The measuring methods and instruments for the performance shall be in accordance with Table 9. Instruments that can measure in an accuracy at least equivalent thereto may also be used. The temperature for measurement shall be (20 ± 2) °C.



Table 9 Item a)



Measuring methods of performance Measuring method



Measuring instrument Standard scale of length a) Micrometer microscope (0.1 mmmax. in scale interval)



Stretching the tape measure on the inspection table horizontally, measure the length to be inspected by means of a standard scale of length a) and a micrometer microscope, with each of the tensions of ±10 % of the tension indicated on a part of the tape measure being applied in the axial direction of the tape measure (without application of the tension in the case of a convex rule and a narrow tape measure) (see Figure 4). - Where the materials of the standard scale of length and those of the measured object are the same, the measurement may be made at normal temperature, as their rates of linear expansion are identical. b) Standout ability - For a convex rule whose width is 13 mm or over, extract the tape gently by the specified length, D mm, from one end of the inspection table with the concave surface upward as shown in Figure 5, and examine whether it bends down. - The length D shall be at least 50 times the tape width. c) Straightness of Standard b) - Place the tape measure so that both ends of the scale side face tape length to be inspected (in the case of the Metal rule (JIS B 7516) nominal size over 5 m, arbitrary scale points of 5 m) are in contact with the standard b), applying the indicated tension on a part of the tape measure (without application of tension in the case of a convex rule and narrow tape measure). - Measure the maximum gap among the gaps of scale side face using a metal rule (see Figure 6). NOTE: Figures 4 to 6 are given as examples. Notes a) The standard of length refers to a length scale having calibration certificate, in which the uncertainty is mentioned, issued by a calibration laboratory approved or registered based on JIS Q 17025. b) The standard refers to an instrument having calibration certificate for the straightness issued by a calibration laboratory or an instrument calibrated by the reference thereto. Tolerances on length



-



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9 B 7512 : 2016 Micrometer



Spring balance Clip



Tape measure



Roller



Standard scale of length



Figure 4



Measuring method (tolerance on length)



Figure 5



Measuring method (standout) Length to be inspected



Tape measure Application of tension indicated on a part of tape measure



Figure 6 --``,,,``,`,`````,,``,,`,`,```-`-`,,`,,`,`,,`---



11



Measuring method (straightness of scale side)



Inspection



The type inspection of tape measures shall be carried out on performances, graduations, appearance, construction and materials, and the results shall conform to the requirements of clauses 6 to 9. The product inspection shall be made by a reasonable sampling plan and inspection items shall be agreed between the interested parties.



12



Designation



The tape measures shall be designated by the number or title of this Standard, type, grade and nominal size. Example 1 Example 2



JIS B 7512 Convex rule Grade 15m Steel tape measure Convex rule Grade 1



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5m



10 B 7512 : 2016



13



Marking



The following information shall be marked on a part of the tape measure which meets all the requirements of this Standard. a)



Grade



b)



Nominal size



c)



Manufacturer's name or its abbreviation



d)



Stainless steel-made, if applicable



e)



Tension 2) (excluding convex rule and narrow tape measure) Note 2)



The unit shall be expressed in the International System of Units (sl).



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Errata for JIS (English edition) are printed in Standardization and Quality Conti'oJ, published monthly by the Japanese Standards Association, and also provided to subscribers of JIS (English edition) in Monthly InfOl'mation. Errata will be provided upon request, please contact: Publishing Group, Japanese Standards Association Mita MT Building, 3-13-12, Mita, Minato-ku, Tokyo, 108-0073 TEL. 03-4231-8550 FAX. 03-4231-8665



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