Table 1. Screw Thread Insert Threaded Hole Data ANSI/ASME B18.29.2M-2005 (R2017) Table 1. (Continued) Screw Thread Insert Threaded Hole Data ANSI/ASME B18.29.2M-2005 (R2017)
Min. Major Diam.
Countersink Diameter, M (120 °± 5 ° included angle)
Minimum Drilling Depth for Each Insert Length, G
Minimum Tapping Depth, T
Minor Diameter
Plug Taps
Bottoming Taps
Pitch Diameter
Insert Length
Nominal Thread Size
4H Max.
All Classes
5H Max.
6H Max.
1 D 1.5 D 2 D 2.5 D 3 D 1 D 1.5 D 2 D 2.5 D 3 D M27 × 3 45.00 68.50 72.00 85.50 99.00 39.00 52.50 66.00 79.50 93.00 30.90 31.50 27.649 28.049 28.948 29.093 29.135 29.188 30.897 30.00 43.50 57.00 70.50 84.00 M30 × 2 42.00 67.00 72.00 87.00 102.00 38.00 53.00 68.00 83.00 98.00 32.50 33.10 30.433 30.733 31.299 31.414 31.454 31.489 32.598 32.00 47.00 62.00 77.00 92.00 M30 × 3 48.00 63.00 78.00 93.00 108.00 42.00 57.00 72.00 87.00 102.00 33.90 34.50 30.649 31.049 31.948 32.093 32.136 32.188 33.897 33.00 48.00 63.00 78.00 93.00 M30 × 3.5 51.00 66.00 81.00 96.00 111.00 44.00 59.00 74.00 89.00 104.00 34.60 35.20 30.767 31.207 32.273 32.428 32.472 32.628 34.546 33.50 48.50 63.50 78.50 93.50 M33 × 2 45.00 61.60 78.00 94.50 111.00 41.00 57.50 74.00 90.50 107.00 35.50 36.10 33.433 33.733 34.299 34.414 34.454 34.498 35.598 35.00 51.50 68.00 84.50 101.00 M33 × 3 51.00 67.60 84.00 104.50 117.00 45.00 61.50 78.00 94.50 111.00 36.90 37.50 33.649 34.049 34.948 35.093 35.135 36.188 36.897 36.00 52.50 69.00 85.50 102.00 M36 × 2 48.00 66.00 84.00 102.00 120.00 44.00 62.00 80.00 98.00 116.00 38.50 39.10 36.433 36.733 37.299 37.414 37.464 37.498 38.598 38.00 58.00 74.00 92.00 110.00 M36 × 3 54.00 72.00 90.00 108.00 126.00 48.00 66.00 84.00 102.00 120.00 39.90 40.50 36.649 37.049 37.948 38.093 38.135 38.188 39.897 39.00 57.00 75.00 93.00 111.00 M36 × 4 60.00 78.00 96.00 114.00 132.00 52.00 70.00 88.00 106.00 124.00 41.30 41.90 36.866 37.341 28.598 38.763 38.809 38.873 41.196 40.00 58.00 76.00 94.00 112.00 M39 × 2 51.00 70.50 90.00 109.50 129.00 47.00 66.50 88.00 105.50 125.00 41.50 42.10 39.433 39.733 40.299 40.414 40.454 40.498 41.598 41.00 60.50 80.00 99.50 119.00 M39 × 3 57.00 76.50 96.00 115.50 135.00 51.00 70.50 90.00 109.50 129.00 42.90 43.50 39.649 40.049 40.948 41.093 41.136 41.188 42.897 42.00 61.50 81.00 100.50 120.00 Notes: (1) The minimum drilling depths allow for a) countersinking the drilled hole to prevent a feather edge at the start of the tapped hole. b) 0.75 to 1.5 pitch of insert set-down to allow for maximum production tolerance. 1 D 1.5 D 2 D 2.5 D 3 D Min. Max. Min. Max. Min. (2) The minimum tapping depth (dimension T ) is the minimum for counter sink holes with insert set-down of 1.5 pitch maximum (See Fig. 1). The dimen sion T = insert nominal length + 1 pitch. (3) Thread diameters are calculated as follows: H 2 # Pitch diameter, min. = Pitch diameter, min. of nominal thread + Pitch diameter, max. = Pitch diameter, max. of nominal thread + H 2 max min #
c) Dimensions are shown for both plug and bottoming taps. Plug taps 8 mm and smaller have a male center, and the drilled hole depth dimensions allow for this length (one-half of the diameter of the bolt). Calculation of minimum drilling depth dimension G is as follows: Plug taps 8 mm and smaller, G = insert nominal length + 0.5 × nominal bolt diameter + 4 pitchs for tap chamfer + 1 pitch for tap end clearance + 1 pitch allowance for countersink and maximum insert set-down. Plug taps larger than 8 mm, G = insert nominal length + 4 pitchs for tap chamfer + 1 pitch for tap end clearance + 1 pitch allowance for countersink and maximum insert set-down. Bottoming taps, G = insert nominal length + 2 pitchs for tap chamfer + 1 pitch for tap end clearance + 1 pitch allowance for countersink and maximum insert set-down.
. 0649519 0433013 Major diameter, min. = Pitch diameter, min. + Minor diameter, min. = Pitch diameter min. − Minor diameter, max. = Minor diameter min. + tolerance .
P
#
P
#
where H max and H min are from Table 14, and tolerance is selected from the appropriate table in ANSI/ASME B1.13M with basic major diameter equal to the minimum major diameter of the STI thread.
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