Kia Optima: Tightening Torque Table Of Standard Parts - General Information - Kia Optima TF 2011-2021 Service ManualKia Optima: Tightening Torque Table Of Standard Parts

Bolt nominal diameter (mm)
Pitch (mm)
Torque Nm (kg.cm, lb.ft)
Head Mark 4
Head Mark 7

M5
0.8
3 ~ 4 (30 ~ 40, 2.2 ~ 2.9)
5 ~ 6 (50 ~ 60, 3.6 ~ 4.3)
M6
1.0
5 ~ 6 (50 ~ 50, 3.6 ~ 4.3)
9 ~ 11 (90 ~ 110, 6.5 ~ 8.0)
M8
1.25
12 ~ 15 (120 ~ 150, 9 ~ 11)
20 ~ 25 (200 ~ 250, 14.5 ~ 18.0 )
M10
1.25
25 ~ 30 (250 ~ 300, 18 ~ 22)
30 ~ 50 (300 ~ 500, 22 ~ 36)
M12
1.25
35 ~ 45 (350 ~ 450, 25 ~ 33)
60 ~ 80 (600 ~ 800, 43 ~ 58)
M14
1.5
75 ~ 85 (750 ~ 850, 54 ~ 61)
120 ~ 140 (1,200 ~ 1,400, 85 ~ 100)
M16
1.5
110 ~ 130 (1,100 ~ 1,300, 80 ~ 94)
180 ~ 210 (1,800 ~ 2,100, 130 ~ 150)
M18
1.5
160 ~ 180 (1,600 ~ 1,800, 116 ~ 130)
260 ~ 300 (2,600 ~ 3,000, 190 ~ 215)
M20
1.5
220 ~ 250 (2,200 ~ 2,500, 160 ~ 180)
360 ~ 420 (3,600 ~ 4,200, 260 ~ 300)
M22
1.5
290 ~ 330 (2,900 ~ 3,300, 210 ~ 240)
480 ~ 550 (4,800 ~ 5,500, 350 ~ 400)
M24
1.5
360 ~ 420 (3,600 ~ 4,200, 260 ~ 300)
610 ~ 700 (6,100 ~ 7,000, 440 ~ 505)

1. The torques shown in the table are standard values under the following conditions :
Х Nuts and bolts are made of galvanized steel bar.
Х Galvanized plain steel washers are inserted.
Х All nuts, bolts and plain washers are dry.
2. The torques shown in the table are not applicable :
Х When spring washers, toothed washers and the like are inserted.
Х If plastic parts are fastened.
Х If self-tapping screws or self-locking nuts are used.
Х If threads and surfaces are coated with oil.
3. Reduce the torque values to the indicated percentage of the standard value under the following conditions.
Х If spring washers are used : 85%
Х If threads and bearing surfaces are stained with oil : 85%
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