The Fowler 52-455-025 100mm Sine Bar has the following specifications:
Description : 100mm Sine Bar
Width : 25mm
Distance between Center of Rolls : 100mm +/- .0002"
Fowler Sine Bar equipment used with gage blocks is highly recommended for securing a high degree of accuracy in measuring angles for grinder and milling machine set ups. Both sine and rolls hardened and ground for extreme accuracy.
Top surface is accurate to .00003" per inch of length. Parallelism: .0004".
Flange on end of Bars and Plates for resting work.
Both Sine Bars and 5" Sine Plates have holes for mounting/clamping.