

M V IIINK I>l:\WIN<; AM' 1 



At( il lines arc 11- tinLrui.xh tin- 



gle of the neck from the round part of the bolt H> 

 it. At (0)ii ihowD :i toe-headed bolt, and at /) :m eve-holt. 



sents a book bolt. A bolt with acoant< i-sunk 1 

 is shown in fig 11. If the countersunk head be leir.'t |KT.< 

 as to tak3 up the whole of the unscrewed part of the bolt 

 get the taper bolt shown in fig. 11, which is often used in the 

 couplings of the screw shafts of steamships. The taper l-li 

 has the advantage of having no projecting head, and it may 

 also be made a tight fit .in the hole with less trouble than a 

 parallel bolt. Bolts may also I u r <>nal heads. 



15. 



>'////>. or xfin I half*, are shown in !i:-. I" 1 and l< - > ; ili.-it in 

 fig. 15 is explain stud, while that in tig. 16 1m ;m inn i ni<(li :l t<' 

 collar forged upon it. and is therefore called a r t ,//,> 



tt and /:-/' heads. In tin- -.! nut 



the diameter D across the flats is H</ + jJ, where d 

 'r of the bolt. The same rule gives the wi.lt 1 

 square nut across the flats. A rule very < -onmionlv n>. -d in 

 making drawings of hexagonal nuts is to make the diameter 

 D, across the angles equal to _' / II, the height of the nut. 

 is equal to the diameter of the bolt. In square and 

 headed bolts the height of the head \;m'e- from <I t 

 the other dimensions are the same as fur 

 nuts. 



