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Tohnichi Reference Guide 2019
Standard Tightening Torque

Standard Tightening Torque [N·m] Reference value Standard Tightening Torque [kgf·cm] Reference value
T
T
Nominal diameter [N·m] 0.5T series 1.8T series 2.4T series Nominal diameter [kgf cm] 0.5T series 1.8T series 2.4T series
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[kgf cm]
[kgf cm]
[kgf cm]
[N·m]
[N m]
[N m]
M1 0.0195 0.0098 0.035 0.047 M1 0.199 0.100 0.357 0.479
(M1.1) 0.027 0.0135 0.049 0.065 (M1.1) 0.275 0.138 0.500 0.663
M1.2 0.037 0.0185 0.066 0.088 M1.2 0.377 0.189 0.673 0.897
(M1.4) 0.058 0.029 0.104 0.140 (M1.4) 0.591 0.296 1.06 1.43
M1.6 0.086 0.043 0.156 0.206 M1.6 0.877 0.438 1.59 2.10
(M1.8) 0.128 0.064 0.23 0.305 (M1.8) 1.31 0.653 2.35 3.11
M2 0.176 0.088 0.315 0.42 M2 1.79 0.897 3.21 4.28
(M2.2) 0.23 0.116 0.41 0.55 (M2.2) 2.35 1.17 4.18 5.61
M2.5 0.36 0.18 0.65 0.86 M2.5 3.67 1.84 6.63 8.77
M3 0.63 0.315 1.14 1.50 M3 6.42 3.21 11.6 15.3
(M3.5) 1 0.5 1.8 2.40 (M3.5) 10.2 5.1 18.4 24.5
M4 1.5 0.75 2.7 3.6 M4 15.3 7.6 27.5 36.7
(M4.5) 2.15 1.08 3.9 5.2 (M4.5) 21.9 11.0 39.8 53.0 Technical Data
M5 3 1.5 5.4 7.2 M5 29.4 14.7 53.0 70.6
M6 5.2 2.6 9.2 12.2 M6 53.0 26.5 93.8 124
(M7) 8.4 4.2 15 20.0 (M7) 85.7 42.8 153 204
M8 12.5 6.2 22 29.5 M8 127 63.2 224 301
M10 24.5 12.5 44 59 M10 250 127 449 602
M12 42 21 76 100 M12 428 214 775 1020
(M14) 68 34 122 166 (M14) 693 347 1240 1690
M16 106 53 190 255 M16 1080 540 1940 2600
M18 146 73 270 350 M18 1490 744 2750 3570
M20 204 102 370 490 M20 2080 1040 3770 5000
(M22) 282 140 500 670 (M22) 2880 1430 5100 6830
M24 360 180 650 860 M24 3670 1840 6630 8770
(M27) 520 260 940 1240 (M27) 5300 2650 9590 12600
M30 700 350 1260 1700 M30 7140 3570 12800 17300
(M33) 960 480 1750 2300 (M33) 9790 4890 17800 23500
M36 1240 620 2250 3000 M36 12600 6320 22900 30600
(M39) 1600 800 2900 3800 (M39) 16300 8160 29600 38700
M42 2000 1000 3600 4800 M42 20400 10200 36700 48900
(M45) 2500 1260 4500 6000 (M45) 25500 12800 45900 61200
M48 2950 1500 5300 7000 M48 30100 15300 54000 71400
(M52) 3800 1900 6800 9200 (M52) 38700 19400 69300 93800
M56 4800 2400 8600 11600 M56 48900 24500 87700 118000
(M60) 5900 2950 10600 14000 (M60) 60200 30100 108000 143000
M64 7200 3600 13000 17500 M64 73400 36700 133000 178000
(M68) 8800 4400 16000 21000 (M68) 89700 44900 163000 214000
Standard bolt stress: 210 [N/mm2] Stress of bolt (JIS B1082) Notes: Conversion values rolled up to effective 3-digits.
■ Screws and Applicable "T" Series
Standard T series 0.5T series 1.8T series 2.4T series
Applicable screws 4.6-6.8 - 8.8-12.9 10.9-12.9
(Strengths) (Material) SS, SC, SUS Brass, Copper, Aluminum SCr, SNC, SCM SCr, SNC, SCM, SNCM
Axial tension standard value 210 105 380 500
[N/mm ] Min - Max 300-160 150-80 540-290 710-380
2
To be applied to ordinary Male and female screws with
Application screws, unless otherwise copper, aluminum or plastic, Durable screw joints made of special steel including those
affected by additional dynamic loads (Friction clamping)
specified for die-cast plastic products
Applicable products Ordinary products Electronic products Vehicles, Engines Construction products
* The maximum to the minimum of the axial stress is considered as the dispersion of the torque coefficient.
Example: max = 210 × (0.2/0.14) = 300 [N/mm ]
2
Torque coefficient: 0.14/Min. - 0.2/Avg. - 0.26/Max.
Calibration Certificate
● Torque wrenches are measuring instruments. The calibration certificate is the document which certifies the
accuracy of the torque products, which are traceable to Japanese national standards. Please keep the calibration
certificate for future use.
● Accuracy % is calculated on each indicated value. Accuracy stated as “+/- a percentage + 1 digit” indicates that
digital display will round up to next digit in resolution if value falls between digits.
● Tohnichi’s torque products provided with a calibration certificate can be used immediately at ISO9000 facilities
without the need for further acceptance inspection or any additional certifications.
● The calibration certificate is effective for 1 year from the date of first use within 3 years from the date of
inspection. Please fill in the date in the calibration certificate when first used.
● Tohnichi’s manual torque tools are normally guaranteed to 100,000 tightening cycles or 1 year. For click type
torque wrenches, it can be also used up to 1,000,000 tightening cycles if the function is properly maintained and
adjusted at every 100,000 cycles.
RoHS/Restriction of Hazardous Substances Directive
Following RoHS, which restricts the use of certain hazardous materials in product manufacturing, Tohnichi has
expanded its efforts in environmentally friendly procurement. Starting with our Product Catalog 2011 edition,
the RoH mark is shown on all applicable models conforming to the RoHS directive. For details, please contact
RoHS
Tohnichi.

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