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а) b)
Figure 4.21 – The bolt joint

4.5.2 STUD JOINTS

A stud joint consists of a stud - 3 (figure 4.22), a washer - 4 and a nut - 5. An opening is
shown in a part 1, its diameter equals 1,1 d n (where d n is a nominal diameter of a stud thread) at
the structural drawing of a thread joint. Actual working length of a stud is found as a sum of the
followings parameters:
L = 1+Hn +S w + 0.25×d n,
where  1 is the thickness of a connecting part, H n is the thickness of nut, S w is the thickness of a
washer, d n is the nominal diameter of a thread. The received sum is rounded to the nearest from the
resulted standard row of workings lengths - L at table 4.10.

Table 4.10

Threaded length l 0 according to the set nominal thread diameter d n
Working d n=16 d n=18 d n=20 d n=22 d n=24
length of a
stud L, mm
35 l 0=L–0,5×d n l 0=L–0,5×d n - - -
40 l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n - -
45 l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n -
50 38 l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n
55 38 42 l 0=L–0,5×d n l 0=L–0,5×d n l 0=L–0,5×d n

This table shows the actual value of working length L according to the threaded length l 0.
At the simplified drawing of a stud joint for the calculation of the working length of a stud - L
the dependence is used: L= 1+1,3×d n,
where  1 is the thickness of a connecting part, d n is a nominal thread diameter.

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