本标准是ASME标准B29的修订版。100-2002精密动力传动、双节距动力传动和双节距输送机滚子链、附件和链轮，通过整合其三个组成标准中的两个实现:ASME B29。3双节距动力传动滚子链和链轮以及ASME B29。4个双节距输送机滚子链、附件和链轮。（第三个组成标准B29.1精密动力传动滚子链、附件和链轮在早些时候进行了修订，并作为单独的标准B29.1-2011发布，其标题不变）。B29中以前列出的尺寸限制或容量未作任何更改。 3M和B29。4米；然而，一些文本和几个表格被合并以消除冗余。本标准提供了输送机和动力传动类型的双节距滚子链的综合信息。双节距输送机滚子链是一系列交替组装的滚子链和销链，其中销在衬套内铰接，滚子可在衬套上自由转动。销和衬套压装在各自的连接板中。链板的节距是基本系列链条链板节距的两倍。销连杆板和滚子连杆板具有相同的直边轮廓。 双节距动力传动滚子链类似于双节距传动滚子链- 除链板宽度通常在中心处减小以产生8字形外，变距输送机滚子链。这降低了链条的重量，使其更适合动力传输应用。还有（a）一般尺寸、测量载荷和最小极限抗拉强度的表格；（b） 互换性的极限尺寸限制；（c） 带有一个或两个连接孔的直联板和弯联板延长件的尺寸限制；（d） 带延伸销的输送链的尺寸限制；（e） 链轮齿剖面尺寸；（f） 减去不同有效齿数的链轮底部或卡钳直径公差； 和（g）链轮系数，适用于小型和大型滚筒及动力传动系列。关于输送机链条选择的非强制性附录A中提供了补充信息；关于传动链选择的非强制性附录B；以及关于链轮刀具选择的非强制性附录C。

This Standard is a revision of the ASME Standard B29.100-2002 Precision Power Transmission, Double-Pitch Power Transmission, and Double-Pitch Conveyor Roller Chains, Attachments, and Sprockets, achieved by consolidation of two of its three constituent Standards: ASME B29.3 Double-Pitch Power Transmission Roller Chains and Sprockets and ASME B29.4 Double-Pitch Conveyor Roller Chains, Attachments, and Sprockets. (The third constituent Standard B29.1 Precision Power Transmission Roller Chains, Attachments and Sprockets was earlier revised and published as a separate Standard B29.1-2011 with its title unchanged). No changes were made to dimensional limits or capacities formerly listed in B29.3M and B29.4M; however, some text and several Tables were merged to eliminate redundancies.This Standard provides consolidated information on double-pitch roller chains of both the conveyor and power transmission types.A double-pitch conveyor roller chain is a series of alternately assembled roller links and pin links in which the pins articulate inside the bushings and the rollers are free to turn on the bushings. The pins and bushings are press-fitted into their respective link plates. The pitch of link plates is twice that of the link plates of the base series chain. Pin link plates and roller link plates have identical, straight-edge contours. A double-pitch power transmission roller chain is similar to a double-pitch conveyor roller chain except that the link-plate widths are usually reduced in the center to produce a figure-eight shape. This reduces the weight of the chain to make it more suitable for power-transmission applications.There are also Tables for (a) General dimensions, measuring loads and minimum ultimate tensile strengths; (b) Ultimate dimensional limits for interchangeability; (c) Dimensional limits for straight- and bent-link plate extensions with one or two attachment holes; (d) Dimensional limits for conveyor chains with extended pins; (e) Sprocket tooth section profile dimensions; (f) Minus tolerances on the bottom or caliper diameters of sprockets for various numbers of effective teeth; and (g) Sprocket factors for small and large roller and power-transmission series.Supplementary information is provided in Nonmandatory Appendix A on conveyor chain selection; in Nonmandatory Appendix B on transmission chain selection; and in Nonmandatory Appendix C on sprocket cutter selection.