Torque Tensioning

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

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

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
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
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.