1. BA, Brass & Model Engineer Threads
  2. Model Engineer

Model Engineer

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ME = Model Engineer Threads These come in 32,40 and 60 tpi sizes. Model Engineer nuts and bolts are rarely commercially available.
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Size Outside Dia Inch Tpi Pitch Inch Core Dia Inch Thread Depth Thou Tapping Drill Size Inch Tapping Drill mm Letter Or Number
1/8 0.13 32 0.03 20 0.09 2.4 3/32
5/32 0.16 32 0.03 20 0.12 3.2 1/8
3/16 0.19 32 0.03 20 0.16 4.0
7/32 0.22 32 0.03 20 0.19 4.7
1/4 0.25 32 0.03 0.21 20 0.21 5.5 3
9/32 0.28 32 0.03 0.24 20 0.25 6.3 D
5/16 0.31 32 0.03 0.27 20 0.28 7.1 J
3/8 0.38 32 0.03 0.34 20 0.34 8.6 R
7/16 0.44 32 0.03 0.40 20 0.40 10.2 Y
1/2 0.50 32 0.03 0.46 20 0.47 11.8 15/32
1/8 0.13 40 0.03 0.09 16 0.09 2.4 3/32
5/32 0.16 40 0.03 0.13 16 0.13 3.3 30
3/16 0.19 40 0.03 0.16 16 0.16 4.0 22
7/32 0.22 40 0.03 0.19 16 0.19 4.8 12
1/4 0.25 40 0.03 0.22 16 0.22 5.7 2

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