Specifications of historical Thread Standards

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 flank angle is 55°.

Repair sizes for locomotive construction, DIN 30284.

Diameter for bolt and nut
Thread SizeTapping Drill Size
mm
Core Area
cm2
TPIPitch
mm
W 14 x 1/12" DIN 3028411.2901.00122.117
W 15 x 1/12" DIN 3028412.2901.18122.117
W 17 x 1/11" DIN 3028414.0421.54112.309
W 18 x 1/11" DIN 3028415.0421.77112.309
Whitworth Fine Thread DIN 30284

Special thread for fire extinguishing fittings DIN LON 293

Diameter for bolt and nut
Thread SizeTapping Drill Size
mm
Core Area
cm2
Pitch
mm
Sg 56 x 3.75 LON 29352.5021.643.75
Whitworth Fine Thread DIN LON 293