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Kia Optima: Tightening Torque Table Of Standard Parts - General Information - Kia Optima TF 2011-2026 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 :
• Nuts and bolts are made of galvanized steel bar.
• Galvanized plain steel washers are inserted.
• All nuts, bolts and plain washers are dry.
2. The torques shown in the table are not applicable :
• When spring washers, toothed washers and the like are inserted.
• If plastic parts are fastened.
• If self-tapping screws or self-locking nuts are used.
• 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.
• If spring washers are used : 85%
• If threads and bearing surfaces are stained with oil : 85%
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