Service And Maintenance Intervals; Tightening Bolts And Nuts - Hardi COMMANDER 4500 Instruction Book

6 - Maintenance

Service and Maintenance Intervals

Tightening Bolts and Nuts

When tightening bolts and nuts as a part of periodic service or due to replacement of spare parts, it is important to apply
the correct torque. This will prevent accidents and prolong the lifetime of the parts included in the bolted joints.
If not otherwise stated in this book, please tighten bolts and nuts using the following torques.
Material: Surface treated steel
Bolt size Recommended
(metric) torque
M4 21 In/lb (2.4 Nm)
M5 44 In/lb (5 Nm)
M6 71 In/lb (8 Nm)
M8 15 Ft/lb (20 Nm)
M10 29 Ft/lb (39 Nm)
M12 52 Ft/lb (70 Nm)
M14 83 Ft/lb (112 Nm)
M16 133 Ft/lb (180 Nm)
M18 177 Ft/lb (240 Nm)
M20 258 Ft/lb (350 Nm)
M22 361 Ft/lb (490 Nm)
M24 443 Ft/lb (600 Nm)
M27 720 Ft/ lb (976 Nm)
M30 959 Ft/lb (1300 Nm)
*Exceeding this value results in a great risk of deforming the bolt.
±
WARNING! Applying too little torque will result in these risks:
• bolted joints will rattle and thus fail under fatigue
• bolts are being worn quickly and thus will not fulfill their design purpose
• bolted joints will come loose
• accidents caused by assembled parts coming apart due to bolts or nuts failing or falling off.
±
WARNING! Exceeding the maximum torque will result in these risks:
• damaging or stripping the threads and deforming the bolt
• bolt heads will be broken
• bolted joints will come loose
• accidents caused by assembled parts coming apart due to bolts breaking at a later time.
102
Maximum
torque*
27 In/lb (3 Nm)
53 In/lb (6 Nm)
89 In/lb (10 Nm)
18 Ft/lb (25 Nm)
37 Ft/lb (50 Nm)
63 Ft/lb (85 Nm)
103 Ft/lb (140 Nm)
159 Ft/lb (215 Nm)
225 Ft/lb (305 Nm)
321 Ft/ lb (435 Nm)
435 Ft/lb (590 Nm)
553 Ft/lb (750 Nm)
811 Ft/lb (1100 Nm)
1103 Ft/lb (1495 Nm)
Material: Stainless steel
Bolt size Recommended
(metric) torque
M4 15 In/lb (1.7 Nm)
M5 31 In/lb (3.5 Nm)
M6 50 In/lb (5.6 Nm)
M8 124 In/lb (14 Nm)
M10 20 Ft/lb (27 Nm)
M12 36 Ft/lb (49 Nm)
M14 58 Ft/lb (78 Nm)
M16 93 Ft/lb (126 Nm)
M18 124 Ft/lb (168 Nm)
M20 181 Ft/lb (245 Nm)
M22 253 Ft/lb (343 Nm)
M24 310 Ft/lb (420 Nm)
M27 504 Ft/lb (683 Nm)
M30 671 Ft/lb (910 Nm)
Maximum
torque*
19 In/lb (2.1 Nm)
37 In/lb (4.2 Nm)
62 In/lb (7.0 Nm)
155 In/lb (17.5 Nm)
26 Ft/lb (35 Nm)
44 Ft/lb (60 Nm)
72 Ft/lb (98 Nm)
111 Ft/lb (151 Nm)
158 Ft/lb (214 Nm)
225 Ft/lb (305 Nm)
305 Ft/lb (413 Nm)
387 Ft/lb (525 Nm)
568 Ft/lb (770 Nm)
772 Ft/lb (1047 Nm)