Whitworth Fine Thread DIN LON 286, 10 TPI

Attention!

Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.
The thread angle is 55°.

Diameter for bolt and nut
Thread Size Tapping Drill Size
mm		 Core Area
cm2		 TPI Pitch
mm
W 20 x 1/10" LON 16.746 2.20 10 2.54
W 23 x 1/10" LON 19.746 3.06 10 2.54
W 26 x 1/10" LON 22.746 4.06 10 2.54
W 30 x 1/10" LON 26.746 5.62 10 2.54
W 33 x 1/10" LON 29.746 6.95 10 2.54
W 34 x 1/10" LON 30.746 7.42 10 2.54
W 36 x 1/10" LON 32.746 8.42 10 2.54
W 37 x 1/10" LON 33.746 8.94 10 2.54
W 40 x 1/10" LON 36.746 10.60 10 2.54
W 42 x 1/10" LON 38.746 11.78 10 2.54
W 43 x 1/10" LON 39.746 12.41 10 2.54
W 46 x 1/10" LON 42.746 14.35 10 2.54
W 50 x 1/10" LON 46.746 17.16 10 2.54
W 53 x 1/10" LON 49.746 19.44 10 2.54
W 56 x 1/10" LON 52.746 21.85 10 2.54
W 60 x 1/10" LON 56.746 25.29 10 2.54
W 63 x 1/10" LON 59.746 28.04 10 2.54
W 66 x 1/10" LON 62.746 30.92 10 2.54
W 70 x 1/10" LON 66.746 34.99 10 2.54
W 73 x 1/10" LON 69.746 38.21 10 2.54
W 76 x 1/10" LON 72.746 41.56 10 2.54
W 80 x 1/10" LON 76.746 46.26 10 2.54

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