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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 2403 (1991): Short Pitch Transmission Precision Roller Chains and Chain Wheels [PGD 31: Bolts, Nuts and Fasteners Accessories] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 2403 : 1991 IS0 606 : 1982 ( sm s;T*m1 Indian Standard SHORT PITCH NOISSIMSNART NOISICERP ROLLER CHAINS AND CHAIN WHEELS ( Second Revision ) tsriF tnirpeR REBMEVON 6991 @ SIB 1991 BUREAU OF INDIAN STANDARDS KANAM ,NAVAHB 9 RUOAHAB HAHS RAFAZ GRAM NEW IHLED 200011 October 1991 Price Group 7 IS 2403 : 1991 IS0 606 : 1982 Indian Standard SHORT PITCH TRANSMISSION PRECISION ROLLER CHAINS AND CHAIN WHEELS ( Second Revision ) NATIONAL FOREWORD This Indian Standard ( Second Revision ) which is identical with IS0 606 : 1982 ‘Short pitch transmission precision roller chains and chain wheels’, issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on therecommen- dation of the Transmission Devices Sectional Committee ( LMD 10 ) and approval of the Light Mechanical Engineering Division Council. This standard was first published in 1964. It was revised in 1975 taking assistance from IS0 606 : 1982. This second revision has been harmonised with IS0 606 : 1982. In the adopted standard certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’. b) Comma ( i ) has been used as a decimal marker while in Indian Standards, the current practice is to use point ( . ) as the decimal marker. In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated: International Corresponding Indian Standard Degree of Standard Equivalence *ISO 286/l : 1988 IS 919 ( Part 1 ) : 1963 Recommendations for Technically lim its and fits for engineering : Part 1 eqivalent General engineering *ISO 286/2 : 1988 *Revision of earlier vemion. 1 3 _..-~.--~_ . _ r- r As in the Original Standard, this Page is Intentionally Left Blank IS 2403 : 1991 IS0 606 : 1982 0 Introduction The dimensions of chain specified ensure complete interchangeability of any given size and provide interchangeability The provisions of this International Standard have been arrived of individual links of chains for repair purposes. at by including sizes of chains used by the majority of countries in the world, and by unifying dimensions, strength and other data in respect of which current national standards were diifer- 1 Scope and field of application ing and at the same time eliminating certain side ranges listed in some national standards for whch it was considered a universal This lnternrtional Standard applies to short pitch precision usage had not heen establishetl. roller chains of simple and multiplex construction suitable for the mechanical transmission of power and allied applications, The whole applicational field open to this medium of transr is together with the tooth gap forms and rim profiles of their sion has been covered hy the ranges of chains already estab- associated chain wheels. It covers dimensions, tolerances, lished. To achieve this the sizes of 12.7 mm (0.5 in) to 76.2 rn; j measuring loads and minimum breaking loads. (3.0 in) pitch inclusive have been duplicated by the inclusion of chains derived from standards originating in the western hemisphere and centred around ANSI (suffix A) and, on the 2 Reference other hand, by chains representing the unification of the prin- cipal standards originating in Europe and centred around BSI I SO 28611, IS0 system of limits and fits - Part 1 : General; (suffix B), the two being complementary for the coverage of tolerances and deviations. 1) the widest possible tield of application. 3 Chains The part of this International Standard covering chain wheels represents the unification of all the relevant national standards 3.1 Nomenclature in the world and includes, in particular, complete tolerances relating to tooth forrn which are absent from most current Figures 1, 2 and 3 do not define the actual form of the chain national standards. plates. Roller chain, simple Roller chain, multiple itriplex) Figure 1 - Roller chains It At present at the stage of draft. (Revision of ‘ISO/R 286-lSZ.1 3 i Es.2403:1991 ?so606:1982 inner plate Roller -- Roller Inner plate Bush Inner link Outer Outer plate plate Intermediate plates Bearing pins Bearing pins Outer plate a Outer link simple Outer link duplex pin Spring Detachable fastener plate Connecting link with spring fastener Fastener Plate with Fixed riveted connecting connecting pin pin Fastener Fastener (schematic) (schematic) riveted connecting pin Other detachable connecting links 1 (Fasteners may be of various designs. Drawings indicate only their position. Inner 7 elate Cranked plate Roller Detachable .Bush connecting pin Cranked plate Fastener (schematic) pin riveted Cranked link single Cranked, link double Figure 2 - Types of links NOTE - Dimensional definitions are contained in the key to tables 1 and 2 4 IS 2403.:l!&l IS0 606: 1982 3.2 Designation 3.5 Proof loading Transmission precision roller chains shall be designated by the It is recommended that all chains should be proof loaded to standard IS0 chain number given in tables 1 and 2, one-third of the minimum tensile breaking load given in tabIes the first two digits expressing the pitch in sixteenths of an inch. 1 and 2. The IS0 chain numbers in tables 1 and )M are supplemented by a hvohenated suffix 1 for simole chain. 2 for dublex chain, 3 for triplex chain, etc., for examdIe lSB-1; 168-2, i6B-3, et& 3.6 Length accuracy 3.3 Dimensions Finished chains shall be measured after proof loading Where applicable) but before lubricating. Chains shall conform to the dimensions given in tables 1 and 2. Maximum and minimum dimensions are specified to The standard length for measurement shall be a minimum of : ensure interchangeability of links as produced by different makers of chain. They represent limits for interchangeability, but are not the actual tolerances that should be used in a) 610 mm (24 in) for IS0 chain numbers f&B to 128 and manufacture. 661 to 085 inclusive, 3.4 Minimum ultimate tensile strength b) 1 226 mm (46 in) for IS0 chain numbers 16A to 728 inclusive, 3.4.1 The minimum tensile strength is the minimum strength of samples tested to destruction in tensile loading, as defined in and shall terminate with an inner link at each end. 3.4.2. This strength is not a working load. It is intended primar- ily as a comparative figure between chains of various construc- The chain shall be supported throughout its entire length and tions. For application information, the manufacturers or their the measuring load in tables 1 and 2 shall be applied. published data should be consulted. To comply with this International Standard, the length shall be the nominal length subject to the limits of tolerance : 3.4.2 A tensile load, not less than that specified in table 1, + $16 96 or 2, is applied slowly to the ends of a chain length, containing at least five free pitches, by means of shackles per- mitting free movement on both sides of the chain centre line, in The length accuracy of chains which have to work in parallel the normal plane of articulation. shall be within the limits above but matched in agreement with the manufacturer. Failure shall be considered to have occurred at the first point where increasing extension is no longer accompanied by increasing load, i.e. the summit of the load/extension diagram. 3.7 Marking Tests in which failures occur adjacent to the sh ackles should be disregarded. The chain shall be marked with : a) the manufacturer’s name or trade mark; 3.4.3 The tensile test shall be considered a destructive test. .~ Even though a chain may not visibly fail when subjected to the minimum breaking load, it will have been stressed beyond the bj the IS0 chain number (see column 1 of tables 1 and 2. yield point and will be unfit for service. 5 IS 2403:1991 ls0606:1932 Outer Inner plate plate Cranked link Dimension c represents the clearance between the cmnked link plates and the straight plates available during articulation. Plain pin Shouldered pin Sectio ns through chain The chain path depth ht is the minimum depth of c hannel through which the assembled chain will pass. Simple Duplex Triplex The overall width of a chain with a joint fastener is equal to the width over the bearing pins 64, & or be plus b for riveted pin end (or + 1.6 3 for headed pin end) if fastener is on one sic only, or + 2 b if fastener is on both sides. The width over bearing pins for chains vvtder than triplex is equal to bq + p, (number of strands in chain - 1). Figure t- Key to tablm 1 and 2 6