ASME B29-24:2002 pdf download ROLLER LOAD CHAINS FOR OVERHEAD HOISTS
1 SCOPE
This Standard covers specialized roller chains thatare designed specifically as load chains for use inoverhead hoists.
2 PURPOSE
The purpose of this Standard is to serve as a guideto purchasers and users of overhead hoists, and alsoas a reference in related standards such as ASMEANSI B30.16，Overhead Hoists (Underhung)，(latestedition) with respect to roller load chains being madespecifically for use in various types of overhead hoists.including general chain dimensions,chain strengthsinspection and maintenance procedures, and guidelinesfor the proper selection of replacement chain.
3 ROLLER LOAD CHAINS
3.1 Nomenclature
These chains consist of a series of alternately assem-bled roller links and pin links in which the pins articulateinside the bushing and the rollers are free to turn onthe bushing. The pins and bushing are press fit in theirrespective link plates. See Fig. 1.
3.2 General Proportions
(a) Roller diameter is approximately /s of the pitch(b) Chain width is defined as the distance betweenroller link plates.It is approximately g of the chainpitch.
(c) Pin diameter is approximately 6 of the pitchor the roller diameter.
(d) Maximum height of the roller link plates — 0.95of the pitch.
(e) Maximum height of pin link plates – 0.82 ofthe pitch.
(f) Link plate thickness is approximately ‘g of thechain pitch.
3.3 Numbering System
The chain numbering system adopted for this Standardis based on chain pitch, and also on chain proportionsand link plate thickness as compared to the majorityof chains shown for a given pitch.A listing of loadchain numbers and related chain dimensions is givenin Table 1. The numbering system consists of a twodigit number. followed by either a single or double lettersuffix. These numbers and letter denote the following(a) Left-H霖稗超块褒搬 帮隘案胺扮啊唉把飞采膊幻惭采暗地碍虎卿挨壁鞍辈皑案稗吧稗啊曙扮如度檬恳颁杠尝汉吏份础 denotes number of s in. ithe chain pitch
(b) Right-Hand Digit
(1) 0 (zero) denotes chain of usual proportions(2) 1 (one) denotes chain of special proportions(c) Letter Suffix
(1) S denotes normal link plate thickness
(2) HS denotes heavier than normal link platethickness
3.4 Minimum Ultimate Tensile Strength
Minimum Ultimate Tensile Strength (MU.T.S.) forchain covered by this Standard is the minimum forceat which an unused, undamaged chain could fail whensubjected to a single tensile loading test.
WARNING: The Minimum Ultimate Tensile Strength is NOT assworking load””! The M,U.T.S. greatly exceeds the maximumforce that may be applied to the chain.
(a) Test Procedure. A tensile force is slowly appliedat a rate not to exceed 2.0 in. per min,in a uniaxialdirection to the ends of the chain sample.
(b) The tensile test is a destructive test. Even thoughthe chain may not visibly fail when subjected to theMinimum Ultimate Tensile Force, it will have beendamaged and will be unfit for service
3.5 Length Tolerance
New chains under standard measuring load shouldnot be underlength.The overlength tolerance is shownin Table l and it is based on:
ASME B29-24:2002 pdf download
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