Table 3. American National Standard T-Nuts ANSI/ASME B5.1M-1985 (R2014)
E 3
A 3
R 3
K 3
W 3
C 3
T-NUTS
L
B 3
2
Rounding of Corners R 3 W 3
Width of Tongue A 3
Tap for Stud b E 3
Width of Nut B 3
Height of Nut C 3
Nominal T-Bolt Size a
Total Thickness Including Tongue c K 3
Length of Nut c L 3
inch
mm
inch
mm
inch
mm
inch
mm
inch mm inch mm
inch mm Max.
Min.
Max.
Min.
UNC-3B ISO d
Max. Min. Max. Min. Max.
Min. Max. Min.
inch mm inch mm Max. Max. Max. Max.
4 5
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… 0.2506… … … … … … … ………… … …… … … … …………… 0.312 8 0.330 0.320 8.7 8.5 0.250-20 M6 0.562 0.531 15 14 0.188 0.172 6 5.6 0.281 9 0.562 18 0.02 0.5 0.03 0.8 0.375 10 0.418 0.408 11 10.75 0.312-18 M8 0.688 0.656 18 17 0.250 0.234 7 6.6 0.375 10.5 0.688 20 0.02 0.5 0.03 0.8 0.500 12 0.543 0.533 13.5 13.25 0.375-16 6M10 0.875 0.844 22 21 0.312 0.297 8 7.6 0.531 12 0.875 23 0.02 0.5 0.06 1.5 0.625 16 0.668 0.658 17.25 17 0.500-13 M12 1.125 1.094 28 27 0.406 0.391 10 9.6 0.625 15 1.125 27 0.03 0.8 0.06 1.5 0.750 20 0.783 0.773 20.5 20.25 0.625-11 M16 1.312 1.281 34 33 0.531 0.500 14 13.2 0.781 21 1.312 35 0.03 0.8 0.06 1.5 1.000 24 1.033 1.018 26.5 26 0.750-10 M20 1.688 1.656 43 42 0.688 0.656 18 17.2 1.000 27 1.688 46 0.03 0.8 0.06 1.5 1.250 30 1.273 1.258 33 32.5 1.000-8 M24 2.062 2.031 53 52 0.938 0.906 23 22.2 1.312 34 2.062 53 0.03 0.8 0.06 1.5 1.500 36 1.523 1.508 39.25 38.75 1.250-7 M30 2.500 2.469 64 63 1.188 1.156 28 27.2 1.625 42 2.500 65 0.03 0.8 0.06 1.5 42 46.75 46.25 M36 75 74 32 30.5 48 75 1 2 48 52.5 51.75 M42 85 84 36 34.5 54 85 1 2 a T-slot dimensions to fit the above nuts will be found in Table 1. b For tolerances of inch threads see page 1951. c No tolerances are given for “Total Thickness” or “Nut Length” as they need not be held to close limits. d Metric tapped thread grade and tolerance position is 5H (see page 2019 ).
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