Bridge type flat feet 
 Second, common specifications 500 × 50 1000 × 50 2000 × 80 3000 × 100 4000 × 100 6300 × 120 
 750 × 50 1600 × 70 2500 × 90 3500 × 100 5000 × 110 8000 × 120 
 Third, the bridge type flat-foot accuracy: 0, 1, 2, 3 
 Technical requirements: manufacturing, materials, iron HT250 JB/T7977-99 standard, face scraping process, the use of temperature (20plusmn;) ℃ face requirements: should not seriously affect the appearance and performance of the sand hole, stomatal crack, slag, shrink loose, scratches, bumps, rust point defects. Large bearing large, heavy, high value, are a single piece or small batch production, but also bear in supporting the delivery of key products or important projects, is a highly sophisticated technical products. Measure it using a special measuring methods and measurement tools. Its diameter, diameter, raceways, standard parts within the cone equipped with a special side of the bridge foot instead of, so you can play a simple, easy to use, accurate measurement, saving the effect of the economy. So the bridge feet was chosen as the production of large bearings, special measuring tools to master this particular special measuring the detection method is extremely necessary. Five works: the bridge-foot is the exact plane of foot-shaped gauge is mainly used for coloring, indicating that the flatness of the table method, inspection plate, long rails, etc., are also commonly used in the straight edge of the optical gap law of the workpiece edge , general manufacturing quality cast iron, rectangular flat feet are also useful for bearing steel or granite manufacturing.