Indian Standard Angles (ISA) range:

Grade: IS 2062 E250 / E300 / E350 / E410 / E450
 
Dimension: As per IS 808,
Tolerance as per IS 1852
A(mm) x B(mm) x t(mm) 

ISA 50 x 50 x 5 / 6 mm
ISA 65 x 65 x 6 / 8 / 10 mm
ISA 75 x 75 x 5 / 6 / 8 / 10 mm 
ISA 80 x 80 x 6 / 8 / 10 mm
ISA 90 x 90 x 6 / 7 / 8 / 10 / 12 mm 
ISA 100 x 100 x 6 / 7 / 8 / 10 / 11 / 12 mm 
ISA 110 x 110 x 7 / 8 / 10 / 11 / 12 / 15 / 16 mm 
ISA 120 x 120 x 8 / 9 / 10 / 12 mm
ISA 130 x 130 x 8 / 9 / 10 / 12 / 16 mm 
ISA 150 x 150 x 10 / 12 / 13 / 14 / 15 / 16 / 18 / 20 mm 
ISA 200 x 200 x 12 / 15 / 16 / 18 / 20 / 24 / 25 mm
ISA 250 x 250 x 22 / 25 / 28 / 32 / 35 mm