Despite being a Mechanical Engineering student, I am a complete noob when it comes to knowledge of standards related to nuts, bolts, threads, washers etc. Wanted to familiarize with all these so looking for some book/online resource for learning. Anyone in knowledge of such thing ?

Which country?
ISO for most of Europe (and BS for UK/ DIN for Germany) ASTM (ASME?) for USA.

Your best bet is to just grab a catalogue from the relevant nationality (most manufacturers will have downloadable ones or free hardcopy) and treat yourself to a copy something like Machinery's Handbook (http://www.google.co.uk/search?q=fastener%20standards%20USA&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a&source=hp&channel=np#sclient=psy&hl=en&client=firefox-a&hs=Get&rls=org.mozilla:en-GB%3Aofficial&channel=np&source=hp&q=machinery%27s+handbook&aq=0&aqi=g5&aql=&oq=&pbx=1&fp=2f9cf625c3bade9d) or Kempe's (http://www.google.co.uk/search?q=kemps%20engineering%20book&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a&source=hp&channel=np#sclient=psy&hl=en&client=firefox-a&hs=pft&rls=org.mozilla:en-GB%3Aofficial&channel=np&source=hp&q=kempes+engineering+book&aq=f&aqi=&aql=&oq=&pbx=1&fp=2f9cf625c3bade9d).

A second-hand one should be okay for most purposes (since standards don't change that rapidly), so long as it's not too old.

http://www.google.com/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=en&source=hp&biw=1024&bih=602&q=SAE+and+metric+standards&btnG=Google+Search

Which country?
ISO for most of Europe (and BS for UK/ DIN for Germany) ASTM (ASME?) for USA.
isn't DIN a plug type? the minis are used for mice and keyboards.

threads, nuts, and bolts are measured in the US system of SAE and in the european system of metric.

isn't DIN a plug type? the minis are used for mice and keyboards.
DIN = Deutsches Institut für Normung. The "DIN plug" isn't actually the DIN plug since the German standard covers many types of connector, so unless you also specify which particular document is in use... :shrug:


threads, nuts, and bolts are measured in the US system of SAE and in the european system of metric.
SAE (Society of Automotive Engineers) does have set standards, but as far as I'm aware these conform to to ASTM (American Society for Testing and Materials) guidelines.

BS EN ISO 4014:2011 or the other British Standards if you work in the UK, if you're a student you can get big books with compendiums of these standards in your library or engineering department, ask the lab techs.