Cast Iron Straight Edges are widely used for erection, commissioning and leveling purpose. I- section straight edges is used to check the surface flatness of large precision area such as surface tables and machine tables etc. Cast iron straight edges are also used for blue matching during hand scrapping operations .I-section straight edges have wide and parallel working surface for application of spirit level. Luthra I –Section straight Edge are made as per IS 5268:1991 Grade-1.

cast iron straight edges

Luthra cast iron I-Section Straight Edges are made of good quality closed grain cast iron strictly as per IS 210:1993 confirming to Grade FG-220:

Length of
Straight Edge
mm
Dimensions of parallel type straight edge
Tolerance on flatness of working
surfaces & parallelism tolerance
Width of
Working Surfaces
mm		 Overall
Height
mm		 Flange
Thickness
mm
Grade 1
Microns (um)
500 35 100 12
5
1000 35 100 12
10
1500 50 150 15
15
2000 50 150 15
20
3000 60 190 15
30
4000 75 300 18
40
5000 80 300 18
50
6000 80 300 18
60
  • Castings are stress relieved either by natural aging or by artificial seasoning.
  • Hardness 170-220 BHN.
  • Hand scrapped for surface finish of Grade-1 accuracy.
  • Wooden covers are provided with each straight edge to protect working surfaces.
  • Safe storage wooden box can also be provided on request at extra cost.
  • Actual dimensions of Straight Edges may be more or less than those mentioned in the table below therefore the sizes and dimensions of straight edges of the same length may vary.
  • Only match pair Straight edges will have the same dimensions (i.e. overall depth). The flatness and parallelism will be within specified limits of the standard and those can be used as Matched pairs.
  • I-Section Straight Edges are supplied with computerized calibration certificate traceable to National Physical Laboratory (NPL, Govt Of India ) New Delhi.