locking device Second

Hello friends 
Today let's talk about  Locking device second 
Unified coars and unified fine as (u.N.C.&N.F)
this Of Thread angle As (60)stays  These to thread Called cellar thread 
its thread Close (B.S.F)Looks like him but his In its pitch Somthing stays different

1. metric Thread 
2. this thread of angle(60)stays its thread (U.N)Thread kind stays metric thread these (T.P.I.) Inside. not Giving Her ptch is giving  indian standard  Institution Use metric threadS The second thread as (1)skaikar thread(2)Buttress Thread (3)ekme thread (4)duplicatE thread This is also type of thread But iT does not use Nuts on Bolts 
3. More and more nuts g bolts as like scrow Live  right hand 
4. but some thread also live of left hands  
5. On example myagreto nuts and freewel sarcet as include