Page 86 - 2024诺特扭力英文NovaTork-Torque

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What is The torque equal to arm of force (L) multiply applied force (F).
TORQUE Eg. F = 100N，L = 2m, then T = 100×2 = 200 N • m

T = F • L
L
F
T T — Torque
F — Applied force
L — Arm of force

Torque Unit F — N（newton）；Lb（pound）；Kg（kilogram）
L — m（meter）；cm（centimeter）；ft（foot）；in（inch）
T — N.m（newton meter）；cN.m（newton centimeter）；Lb.ft（foot-pound）；
Lb.in（inch-pound）；Kg.m（kilogram-meter）；cKg.m（kilogram-centimeter）

Strength of bolt ↑，and Torque ↑；
Bolt Bolt surface griction coefficient ↑，and Torque ↑； Bolt surface Torque Axial
& Torque Bolt threads friction coefficient ↑，and Torque ↑； friction coefficient compression
50%
torque 10%
Bolt specification ↑，and Torque ↑

The approximate percentage of Bolt threads
torque acting on the bolt： friction coefficient
40%

Bolt Grade Bolt grade is marked as below:
& Mark X • Y
Eg. Bolt grade 4.6, means：
10 times yield ratio
Separator (1) Tensile strength of bolt material is
1/100 tensile strength 400MPa
(2) Yield ratio of bolt material is 0.6
Yield strength
（Yield ratio = ） (3) Bolt yield strength is 400×0.6 = 240MPa
Tensile strength

Bolt grade 3.6, 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, 12.9, etc.
High strength bolt’s grade is above 8.8, others are called common bolt.
Bolt grade mark： 8.8 8.8

8.8 8.8
Outer-hexagonal Inner-hexangular

Torque Unit N·m kg·m Lb·ft Lb·in
Conversion
1 N·m = 1 0.101972 0.737562 8.850744
1 kg·m = 9.80665 1 7.23301 86.79612
1 Lb·ft = 1.35582 0.138255 1 12

1 Lb·in = 0.112985 0.011521 0.083333 1

For more information about torque conversion, please visit: www.novatork.com.cn

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