Niro Soavi S.p.A
4.3. TIGHTENING NUTS AND STUDS
All the studs used in the compression head are subject to vibrating stress so, in
addition to being made of special, highly resistant material with an accurate
processing cycle, they require specific tightening in accordance with the values
shown in Table 4.3.1.
It is also necessary to frequently check screwn and nuts to make sure that they
do not become loose.
NIRO SOAVI supplies a Maintenance box with the wrenches needed for the
nuts fitted on their machines; we suggest you use a dynamometric wrench (not
included) to check tightening torques as specified in the table below.
STUD SIZE TIGHTENING TORQUE
(N*m)
TIGHTENING TORQUE
(lb.*ft.)
M 8 8 ÷10
6 ÷8
M 10 15 ÷ 20
11 ÷ 15
M 12 25 ÷ 30
19 ÷22
M 16 60 ÷ 70
44 ÷52
M 20 120 ÷ 140
89 ÷104
M 24 210 ÷ 230
155 ÷ 170
M24x2 235 ÷ 260
174 ÷ 192
M 27 310 ÷ 340
229 ÷251
M27x2 350 ÷ 390
258 ÷ 288
M 30 410 ÷ 450
304 ÷ 332
M 33 560 ÷ 600
413 ÷ 445
M33x2 635 ÷ 680 469 ÷ 502
M39 880 ÷ 960 650 ÷709
TABLE 4.3.1
4c010e0c.doc 4.3.1
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