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Technical Information

THREAD DATA CHARTS

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C.E.I.-Thread

  Bicycle Screw Thread DIN 79012

Cycle Engineer Institution Thread, used in the British bicycle industry.
Major Diameter
Inch		 Major Diameter
mm		 Tapping Drill
Size
mm		 TPI Pitch
mm
0.056 1.422 0.965 62 0.409
0.064 1.626 1.190 62 0.409
0.072 1.829 1.393 62 0.409
0.080 2.032 1.596 62 0.409
0.092 2.337 1.854 56 0.453
0.104 2.642 2.642 44 0.577
0.125 3.175 2.499 40 0.635
0.154 3.912 3.236 40 0.635
0.175 4.445 3.600 32 0.794
0.187 4.762 3.917 32 0.794
0.250 6.350 5.309 26 0.977
0.266 6.756 5.715 26 0.977
0.281 7.137 6.096 26 0.977
0.312 7.937 6.896 26 0.977
0.375 9.525 8.484 26 0.977
0.562 14.287 12.287 20 1.270
1.000 25.400 24.359 26 0.977
1.290 32.766 31.639 24 1.058
1.370 34.797 33.670 24 1.058
1.437 36.512 35.385 24 1.058
1.500 38.100 36.973 24 1.058
CEI Thread

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Gage Crib Worldwide, Inc.
6701 Old 28th St SE, Suite B
Grand Rapids, MI 49546-6937
Phone: 001-616-954-6581 • Fax: 001-616-954-6583
Email: gageguy@gagecrib.com

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