Square foot of the bridge type called bridge-foot cast iron bridge-foot cast iron bridge-shaped square foot square foot JB/T7977-99 standard manufacturing, material HT250, working surface scraping process is used to measure the workpiece straightness and flatness measuring , the use of temperature (20 ± 5) ℃. For Machine Tool, Workbench accuracy check, the geometric precision of measurement, the measurement of precision components, scraping and processing technology, is the benchmark of precision measurement. 
 Bridge type flat foot of the specifications: 


 Specifications face straightness or flatness 

 Accuracy class 

 0 
 A 
 2 

 500 × 50 
 3 
 6 
 12 

 750 × 50 
 4 
 8 
 15 

 1000 × 50 

 10 
 20 

 1600 × 70 

 15 
 30 

 2000 × 80 

 18 
 36 

 2500 × 90 

 22 
 44 

 3000 × 100 


 52 

 3500 × 100 


 60 

 4000 x 100 


 68 

 5000 × 110 


 84 

 6300 × 120 


 105 

 8000 × 120 


 132 


 More products: Bridge-type flat feet | cast iron square foot angle flat feet 
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