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Thread dimensions for ISO "medium" class threads 1,6mm to 300mm
Equations & Tables for Screw Thread Tolerance calculations

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1. Fuller metric.. Extensive range on DIN/ISO standard screws with dimensions
2. Pts-UK.. Sizes of various type of Screws
3. CorusConstruction..For details on Black Bolts and nuts etc. click Design > Fasteners
4. Maryland Metrics..Vast quantity of useful technical information on metric screws in downloadable acrobat pages

1. Bolt Science..A site dedicated to the Science & Technology of bolted joints
2. Threaded Fasteners..A Section of the Site DESIGN AND ANALYSIS OF MACHINE ELEMENTS.
3. Bolted Joints..A paper published on the Web
4. Metric Bolt Strength..Bolt Sizes Strengths- American bias
5. Croberts Com..Very useful section on the consequence of Bolt Failure
6. Fastener Design Manual...NASA GRC RP-1228 (9.6 Mbyte pdf file). Design info on bolt + rivet joints
7. Bolt Council Publications...->Guide to Design Criteria for Bolted and Riveted Joints.(6.7 Mbyte pdf file).  Excellent ....
8. SEED Guide...UK based Design Guide for Bolted joints ...Excellent again
9. The yielding of fasteners during tightening...An article with surprising conclusions
10. Keeping It All Together ...Practical notes on bolted joints from an enthuiast
11. International Thread Standards .. A comprehensive set of thread tables including BSP

Note: on tapping holes:
I normally specify a tapped hole depth of 1.5 dia for a fully threaded hole in a blind tapped hole (steel male and female).
The depth of threaded hole if a plug tap is not used i.e for automatic one stage tapping would be deeper.
According to BS1936 the tapping drill should be have a depth greater than the tapped depth (clearance depth) as follows

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Last Updated 12/03/2008