Hi-Strength Metric Fasteners - Class C Solutions Group · PDF fileTorque values are intended ... Record the maximum torque achieved for each bolt. Averaging the recorded results, torque

Dry Threads Lubricated Threads

Ft.-Lbs.(In.-Lbs.)

[Input TorqueFt.-Lbs.]

Nm

Ft.-Lbs.(In.-Lbs.)


NmDia.

M4

4 ‡ 5.1

2.3 ‡ 3.1 (48) s (30) q

M5

8 ‡ 10.3

4.6 ‡ 6.2 (98) s (58) s

M6

13 ‡ 17.5

8 ‡ 10.5 (165) l (100) s

M8

32 ‡ 43

19 ‡ 26 (405) l (245) l

M10

62 n

85

37 ‡ 50 (480) l

M12 108 n 147 65 n 88

M14 173 n 234 104 n 140

M16 270 u 366 162 n 220

M18 370 u 503 223 n 302

M20 525 u 713 316 u 428

M24

[253] u1233

545 u

740 909 ✚

M30

[501] u2449

[301] u 1470 1806 ✚ 1084 ✚

M36

[225] u4280

[135] u 2568 3157 ★ 1894 ★✚ ✚


Ft.-Lbs.(In.-Lbs.)


Nm

Ft.-Lbs.(In.-Lbs.)


NmDia.

M4

3 ‡ 4.5

2 ‡ 2.6 (40) s (23) q

M5

7 ‡ 8.8

4 ‡ 5.2 (78) s (46) s

M6

11 ‡ 15.2

7 ‡ 9 (134) s (80) s

M7

19 ‡ 25.5

11 ‡ 15.2 (225) l (134) s

M8

27 ‡ 36.5

16 ‡ 22 (325) l (195) l

M10

53 ‡ 72.5

32 ‡ 43.5 (640) l (385) l

M12

93 n

126

56 ‡ 75.5 (670) l

M14 148 n 200 90 n 121

M16 231 n 315 140 n 188

M18 317 u 430 190 n 258

M20 450 u 610 270 u 365

M24

[216] u1055

467 u

633 778 ✚

M30

[430] u2095

[260] u 1260 1548 ✚ 929 ✚

M36

[195] u3667

[450] u 2200 2705 ★ 1623 ✚

Bowmetric® 12.9High-Strength Alloy SteelMeets ASTM F568Property Class 12.9 Specifications

Property Class 10.9Medium Carbon Alloy Steel

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Ft.-Lbs.(In.-Lbs.)


Nm

Ft.-Lbs.(In.-Lbs.)


NmDia.

M4

2 ‡ 3.4

1 ‡ 1.8 (30) q (16) q

M5

5 ‡ 6.4

3 ‡ 3.8 (56) s (34) s

M6

8 ‡ 10.6

5 ‡ 6.4 (94) s (56) s

M7

13 ‡ 17.6

8 ‡ 10.6 (155) l (94) s

M8

19 ‡ 25.5

11 ‡ 15.4 (225) l (136) s

M10

37 ‡ 51

22 ‡ 30.5 (450) l (270) l

M12

65 n

88

39 ‡ 53 (470) l

M14 104 n 140 62 n 84

M16 162 n 220 97 n 131

M18 230 n 310 138 n 187

M20 325 u 440 195 n 265

M24 565 u 765 340 u 460

M30

[310] u1515

[185] u 910 1119 ✚ 670 ✚

M36

[545] u2650

[325] u 1590 1955 ✚ 1173 ✚

Property Class 8.8Medium Carbon Steel

Class 12.9

Ft.-Lbs.(In.-Lbs.)

[InputTorqueFt.-Lbs.]

Nm

Ft.-Lbs.(In.-Lbs.)


Dia.

M4

2 ‡ 3 1 ‡

2 1

‡ 2 (22) q (17) q (12) q

M5

4 ‡ 5 3 ‡

4 2

‡ 3 (44) s (34) s (26) q

M6

6 ‡ 8 5 ‡

7 4

‡ 5 (76) s (60) s (42) s

M7

10 ‡ 14.2

8 ‡ 11.4

6

‡ 8 (124) s (100) s (70) s

M8

14 ‡ 19.2

12 ‡ 17

9

‡ 12 (180) l (146) s (102) s

M10

28 ‡ 38

24 ‡ 33

17

‡ 23 (340) l (290) l (205) l

M12

49 ‡ 66

42 ‡ 57

29

‡ 40 (625) l (505) l (350) l

M14

78

n

105

66

n

90

47

‡ 63 (590) l

M16 121 n 165 104 n 141 73 n 98

M18 167 n 225 144 n 195 104 n 140

M20 237 u 320 202 n 274 146 n 198

M24 410 u 555 350 u 475 253 u 343

M30

[226] u 1102

[195] u 952 503 u 682 813 ✚ 702 ✚

M36

[394] u 1925

[340] u 1660

[244]

u 1191 1420 ✚ 1224 ✚ 878 ✚

Bowma-Grip Lock NutsMetric Prevailing-Torque TypePre-LubricatedFor Use on Property Class8.8, 10.9 or 12.9 Bolts

Class 10.9 Class 8.8

Nm

Ft.-Lbs.(In.-Lbs.)


Nm

Guidelines For the Use of This Chart

Torque values are intended only as guidelines for fastener users. Many variables, including environment, affect actual clamp loads. When a precise clamp load is critical to assembly, it is the responsibility of the installer to determine exact torque values with the use of proper instrumentation. These specifications are the recommeded assembly torques for various property classes of Barnes metric threaded fasteners with the following qualifications:

1. Torque values are calculated at 75% of proof load for Property Classes 8.8 and 10.9, and at 80% for Property Class 12.9. This provides a design safety factor.

2. All dry torque values are given for the “as received” condition, Unichrome™ (zinc) plated hex head cap screws.

3. Lubricated torque values are calculated based on applying Barnes Distribution Anti-Seize Compound to the threads before assembly. (Note: This is the recommended approach because it permits lower torque values and results in less clampload scatter.)

4. Special torque values are given when using the Bowma-Grip® Lock Nut because of its highly efficient pre-lubricated coating. Use these values only when using the Bowma-Grip® Lock Nut.

5. All torque values are based on the use of through-hardened flat washers under the bolt head and nut, or only under the bolt head in a tapped and chamfered hole application. This provides a uniform, hard, smooth bearing surface.

6. [Input Torque] is the setting for the 3/4” drive torque wrench, Barnes Distribution Part No. 19813, that will produce the final torque required through the torque multiplier(s). The torque value shown below the bracketed [ ] input torque is the foot-pound torque value developed through the use of a multiplier(s).

7. All torque values are based on standard thread pitch fasteners.

Micrometer Adjustable Torque Wrench Available through Barnes Industrial Supply DivisionCapacity 10-15 In.-Lbs.1/4” DriveWith Ratchet Head

Micrometer Adjustable Torque Wrench Barnes Part No. 19810Capacity 30-150 In.-Lbs.3/8” DriveWith Ratchet Head

Micrometer Adjustable Torque Wrench Barnes Part No. 19811Capacity 150-750 Ft.-Lbs.3/8” DriveWith Ratchet Head

Explanation of SymbolsThe symbols to the right of the recommended torque value represent the torque wrench and torque multiplier(s) (when applicable) recommended for proper installation. In those instances where two torque values are listed, the symbol(s) corresponds to the torque value shown in parenthesis ( ) or brackets [ ].



Torque MultiplierAvailable through BarnesIndustrial Supply DivisionMax. Torque 2000 Ft.-Lbs.Input Drive Size 3/4”Output Drive Size 1”Ratio of Gears 3.6 - 1(Gear Friction Factored)

Torque MultiplierAvailable through BarnesIndustrial Supply DivisionMax. Torque 4000 Ft.-Lbs.Input Drive Size 1”Output Drive Size 1-1/2”Ratio of Gears 3.9 - 1(Gear Friction Factored)

NOTES:

1. For critical applications, use a beam-pointer type torque wrench. Tighten several bolts until the pointer stops rising. Record the maximum torque achieved for each bolt. Averaging the recorded results, torque new assemblies to 75% of the average value.

2. Due to the many variables that affect friction, it is possible to experience as much as ±25% deviation in preload (clampload) with the use of a torque wrench.

* Manufacturer’s identification symbol is required by American Society for Testing and Materials (ASTM), International Organization for Standardization (ISO) and/or Society of Automotive Engineers (SAE).

Bowmetric® and Bowma-Grip® are registered trademarks of MSC Industrial Supply Co. Unichrome™ is a trademark of MSC Industrial Supply Co.

TORQUE CHARTHi-Strength Metric Fasteners

Installation with an inch-pound torque wrench is recommended. Inch-pound torque value is listed in parenthesis.

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Hi-Strength Metric Fasteners - Class C Solutions Group · PDF fileTorque values are intended ... Record the maximum torque achieved for each bolt. Averaging the recorded results, torque