Machinery's Handbook, 31st Edition
1756
HELICAL COIL SCREW THREAD INSERTS Table 6. Torque Test Spacer Dimensions ANSI/ASME B18.29.2M-2005 (R2017)
Diameter or width
60 o + 2 o Countersink diameter
Hole Diameter
Material: Steel Hardness: 45-50 RC Fig. 3. Torque Test Spacer
Minimum Diameter or Width
Hole Diameter
Countersink Diameter
Nominal Insert Size
Minimum Thickness
Max.
Min.
Max.
Min.
2
7.0 8.0 9.0
2.3 2.8 3.5 4.0 4.5 5.5 6.5 7.6
2.1 2.6 3.3 3.8 4.3 5.3 6.3 7.3
2.7 3.3 3.8 4.3 4.9 5.9 7.0 8.4
2.5 3.1 3.6 4.1 4.7 5.7 6.8 8.2
1.5 1.5 2.0 2.0 3.0 3.0 3.5 3.5 4.0 4.0 4.5 4.5 4.5 4.5 5.0 5.0 5.0 5.0 6.0 6.0 6.0 6.0
2.5
3
3.5
10.0 11.0 12.0 14.0 17.0 19.0 23.0 27.0 31.0 35.0 39.0 43.0 47.0 51.0 56.0 62.0 67.0 72.0 77.0
4 5 6 7 8
8.6 10.7 12.7 14.8 16.8 18.8 20.8 22.8 24.8 28.3 31.3 34.3 37.3 40.3
8.3 10.4 12.4 14.4 16.4 18.4 20.4 22.4 24.4 27.9 30.9 33.9 36.9 39.9
9.5 11.5 14.5 16.5 18.5 20.7 22.7 24.7 26.7 29.8 33.8 36.8 39.8 42.8
9.2 11.2 14.2 16.2 18.2 20.4 22.4 24.4 26.4 29.4 33.4 36.4 39.4 42.4
10 12 14 16 18 20 22 24 27 30 33 36 39
Insert Length Selection Engaged Length of Bolt.— Normally, the engaged length of bolt in an insert is deter mined by strength considerations. Material Strengths.— The standard engineering practice of balancing the tensile strength of the bolt material against the shear strength of the parent or boss material also applies to helical coil inserts. Table 7 and Table 8 will aid in developing the full load value of the bolt rather than stripping the parent or tapped material.
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