Machine Drawing — Formula Sheet
CBSE · Class 12 · Engineering Graphics
9 formulas from Machine Drawing (CBSE Class 12 Engineering Graphics) on one page, grouped by topic. Covers Screw Threads and Thread Forms, Bolts and Nuts.
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Get startedFormulas and Key Relations
Screw Thread Fundamentals
d = 6√t
P = Pitch, L = Lead
Standard Thread Profiles
BSW: D = 0.96P, d = 0.64P
Metric: D = 0.86P, d = 0.61P
Bolts and Nuts
Head thickness = 0.8d
Across corners = 1.5d + 3mm
Thread length = 2d + 6mm
Washers and Assembly
Washer outer dia = 2d + 3mm
Washer thickness = d/8
Full sheet with units and worked examples
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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