HOT ROLLED FLAT SPRING STEEL TOLERANCES

                               
 

Width (b)

Range  Tolerance
50 < b ≤ 80 ± 0.5
80 < b ≤ 100 ± 0.6
100 < b ≤ 120 ± 0.7
120 < b ≤ 150 ± 0.8
Thickness  (t)

Range

Tolerance
t ≤ 20 ± 0.25
20 < t ≤ 40 ± 0.30
40 < t ≤ 60 ± 0.50

 

Straightness  (q) Tolerance of ( b ) plane 
q ≤ L’ nin % 0.2

Corner Radius for Profile C ( r )

Tolerance
± 2
Vertical Deviation  
(Ub)
Range  Tolerance
t ≤ 20 0.5
20 < t ≤ 40 1.0
40 < t ≤ 60 1.5

 

 

 

 

 

 

 

 

DIMENSION AND SHAPE TOLERANCES;

 

PROFILE A

 

Profile A : Round ended flat bars made of hot rolled spring steel

 

PROFILE B

 

Profile B : Half round ended flat bars made of hot rolled spring steel

 

PROFILE C

   

Profile C : Smooth and half round ended flat bars made of hot rolled spring steel

 

STRAIGHTNESS

 

    

 

Controlling the accuracy of straightness, q1 should be measured along L1 bar. After that, q2 can be identified throughtout any section of the bar with the refence length of 1000 mm L2.

 

VERTICAL DEVIATION 

   

 

According to the figure vertical deviation for Profile C, should be measured as (u), which is difference from measured width (b).

 

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