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 =d₁+Hn +S_w + 0.25×d_n,

where d₁ is the thickness of a connecting part, H_nis the thickness of nut, S_wis 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 l₀ according to the set nominal thread diameter d_n

This table shows the actual value of working length L according to the threaded length l₀.

At the simplified drawing of a stud joint for the calculation of the working length of a stud - L the dependence is used: L=d₁+1,3×d_n,

where d₁ is the thickness of a connecting part, d_n is a nominal thread diameter.

The parameter 1,3×d_n approximately takes into account the structural sizes of the thickness of a washer, the height of a nut and stocked on length of a stud. For the implementation of the simplified drawing of a stud joint the followings correlations are used: D=2´ d_n; D_w=2,2´ d_n; H=0,8´ d_n; S_w=0,15 ´ d_n.

The structural drawing of a stud joint is shown in figure 4.22, and it is simplified in figure 4.22, b.

а) b)

Figure 4.22 – The stud joint

The parameters of a stud jack are found according to the followings dependences:

d_opening=0,85´ d_n; L_opening=L₁+0,5´ d_n.

According to these parameters a stud jack is done in figure 4.23.

Figure 4.23 – The stud jack