Torque tensioning for standard and specialty industrial fasteners, including industrial threaded fasteners, from Elgin Fastener Group is available for SAE Grades and Metric Property Classes. See charts below.
Table 1 – Torque-Tension Relationships for SAE Grades 2, 5 and 8 |
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| Nom.Size and Threads/ in. |
StressArea (1) in. 2 | Grade 2 Clamp Load Lb. | Grade 2 Torque Dry k=0.2 in – lb. | Grade 2 Torque Lub k=0.15 in-lb. | Grade 5 Clamp Load lb. | Grade 5 Torque Dry k=0.2 in-lb. | Grade 5 Torque Lub k=0.15 in-lb | Grade 8 Clamp Load Lb. | Grade 8 Torque Dry k=0.2 in-lb. | Grade 8 Torque Lub k=0.15 in-lb. |
| 0.138-40 | 0.01014 | 418.0 | 10.2 | 7.7 | 647.5 | 15.6 | 11.7 | 913.5 | 23.4 | 17.6 |
| 0.138-32 | 0.00909 | 401.0 | 9.6 | 7.2 | 579.5 | 14.4 | 10.8 | 818.0 | 21.0 | 15.8 |
| 0.164.36 | 0.01473 | 608.0 | 17.4 | 13.1 | 938.5 | 27.6 | 20.7 | 1306.0 | 40.2 | 30.2 |
| 0.164-31 | 0.01401 | 578.0 | 16.8 | 12.6 | 893.0 | 25.8 | 19.4 | 1261.0 | 40.2 | 30.2 |
| 0.190-32 | 0.01999 | 825.0 | 28.2 | 21.2 | 1275.0 | 43.2 | 32.4 | 1798.5 | 63.6 | 47.7 |
| 0.190-24 | 0.01753 | 723.0 | 24.6 | 18.5 | 1117.5 | 37.2 | 27.9 | 1577.5 | 55.8 | 41.9 |
| 0.250-28 | 0.03637 | 1500.0 | 75.0 | 56.0 | 2319.0 | 116.0 | 87.0 | 3273.0 | 164.0 | 123.0 |
| 0.250-20 | 0.03182 | 1313.0 | 66.0 | 49.0 | 2029.0 | 101.0 | 76.0 | 2864.0 | 143.0 | 107.0 |
| 0.3125-24 | 0.05807 | 2395.0 | 150.0 | 112.0 | 3700.0 | 230.0 | 173.0 | 5225.0 | 327.0 | 245.0 |
| 0.3125-18 | 0.05243 | 2163.0 | 135.0 | 101.0 | 3342.0 | 209.0 | 157.0 | 4719.0 | 295.0 | 221.0 |
| .0375-24 | 0.08783 | 3623.0 | 272.0 | 204.0 | 5600.0 | 420.0 | 315.0 | 7905.0 | 893.0 | 445.0 |
| .0375-16 | 0.07749 | 3196.0 | 240.0 | 180.0 | 4940.0 | 370.0 | 278.0 | 6974.0 | 523.0 | 392.0 |
| 0.4375-20 | 0.11872 | 4896.0 | 428.0 | 321.0 | 7567.0 | 662.0 | 496.0 | 10638.0 | 935.0 | 700.0 |
| 0.4375-14 | 0.10631 | 4385.0 | 384.0 | 288.0 | 6777.0 | 593.0 | 445.0 | 9567.0 | 837.0 | 628.0 |
| 0.500-20 | 0.15995 | 6598.0 | 660.0 | 495.0 | 10197.0 | 1020.0 | 764.0 | 14396.0 | 1440.0 | 1080.0 |
| 0.500-13 | 0.14190 | 5853.0 | 585.0 | 439.0 | 9046.0 | 904.0 | 678.0 | 12771.0 | 1277.0 | 958.0 |
Table 2 – Torque-Tension Relationships for Metric Property Classes |
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| Major Diameter and Thread Pitch | Stress Area mm2 | Class 4.6 Clamp Load kN | Class 4.6 Torque Dry k=0.2N-m | Class 4.6 Torque Lub k=0.15N-m | Class 4.8 Clamp Load kN | Class 4.8 Torque Dry k=0.2N-m | Class 4.8 Torque Lub k=0.15N-m | Class 5.8 Clamp Load kN | Class 5.8 Torque Dry k=0.2N-m | Class 5.8 Torque Lub k=0.15N-m |
| 3.0×0.5 | 5.03 | .085 | 0.50 | 0.40 | 1.17 | 0.70 | 0.50 | |||
| 3.5×0.6 | 6.78 | 1.14 | 0.80 | 0.60 | 1.58 | 1.10 | 0.80 | |||
| 4.0×0.7 | 8.78 | 1.14 | 1.20 | 0.90 | 2.04 | 1.60 | 1.20 | |||
| 5.0×0.8 | 14.2 | 2.40 | 2.40 | 1.80 | 3.30 | 3.30 | 2.50 | 4.05 | 4.00 | 3.00 |
| 6.0×1.0 | 20.10 | 3.40 | 4.00 | 3.00 | 4.67 | 5.66 | 4.20 | 5.73 | 6.90 | 5.20 |
| 8.0×1.25 | 36.60 | 6.18 | 9.90 | 7.40 | 8.51 | 13.60 | 10.20 | 10.40 | 16.70 | 12.50 |
| 10.0×1.50 | 58.00 | 9.79 | 19.60 | 14.70 | 13.48 | 27.00 | 20.00 | 16.50 | 33.10 | 24.80 |
| 12.0×1.75 | 84.30 | 14.22 | 34.10 | 25.60 | 19.60 | 47.00 | 35.00 | 24.00 | 58.00 | 43.00 |
| Tensile Strength Proof Load Stress |
400 MPa 224 MPa |
420 MPa 310 MPa |
520 MPa 380 MPa |
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| Major Diameter and Thread Pitch | Stress Area mm2 | Class 8.8 Clamp Load kN | Class 8.8 Torque Dry k=0.2N-m | Class 8.8 Torque Lub k=0.15N-m | Class 9.8 Clamp Load kN | Class 9.8 Torque Dry k=0.2N-m | Class 9.8 Torque Lub k=0.15N-m | Class 10.9 Clamp Load kN | Class 10.9 Torque Dry k=0.2N-m | Class 10.9 Torque Lub k=0.15N-m |
| 3.0×0.5 | 5.03 | |||||||||
| 3.5×0.6 | 6.78 | |||||||||
| 4.0×0.7 | 8.78 | |||||||||
| 5.0×0.8 | 14.20 | |||||||||
| 6.0×1.0 | 20.10 | |||||||||
| 8.0×1.25 | 36.60 | 16.50 | 26.40 | 19.80 | 17.80 | 28.50 | 21.40 | 22.80 | 36.50 | 27.30 |
| 10.0×1.50 | 58.00 | 26.10 | 52.20 | 39.20 | 28.30 | 56.60 | 42.40 | 36.10 | 72.20 | 54.20 |
| 12.0×1.75 | 84.30 | 37.90 | 91.00 | 68.00 | 41.10 | 99.00 | 74.00 | 52.50 | 126.00 | 94.00 |
| Tensile Strength Proof Load Stress |
830 MPa 600 MPa |
900 Pa 650 Pa |
1040 Pa 830 Pa |
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| NOTE:The stress area of threaded series not included in Table 2 may be computed from the equation: As=0.7854 (D – 0.9382P)2 WHERE: As=Stress area in mm2 D=Diameter in mm P=Pitch in mmCAUTION:The previously listed torque and resulting tension are provided as an advisory guide. Individual application discretion is recommended. The content, has been presented as accurately as possible, but responsibility for its application lies with the user, and Elgin Fastener Group is not responsible for any loss, claim, or damage arising there from. A complete discussion and tutorial on Torque Tensioning is available from Elgin Fastener Group by request. | ||||||||||