The book is available in both print and digital formats from retailers like Amazon India
Another strong possibility is that the "31" refers to a . Scanned copies of the data book are often large (30–50 MB) due to image-based tables and charts. A 31 MB PDF would be a reasonable, high-quality scan. Students looking for a compact yet readable file might append "31" to specify file size or because that specific file is popular in forums. machine design data book by vb bhandari pdf 31
For mechanical engineering students and professionals in India, the Machine Design Data Book by V. B. Bhandari The book is available in both print and