pitch资源列表

[国外标准] BS 978-1-1968 Fine pitch gears

[国外标准] JIS B1803-1998 Double-pitch precision roller chains for transmission and conveyors

[国外标准] JIS B1801-2009 Short-pitch transmission precision roller chains and bush chains

[国外标准] JIS B1801-1997 Short-pitch transmission precision roller chains and bush chains