Sonipat, Haryana
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Straight Edges

We are instrumental in offering a qualitative range of Straight edges that are used for checking surface flatness of large precision area. Straight Edges have been designed well and ribbed in the best manner to retain their accuracy under varying conditions and are as light as possible without sacrificing rigidity.

Our range of straight edges includes cast iron straight edges, engineer''s steel straight edges, prismatic straight edges, triangular straight edges, tool maker edge, knife edge, light weight aluminum straight edges and granite straight edges.


Cast Iron Straight Edges

We are one of the well-known manufacturers of cast iron straight edges that 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.

 

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.

 

  • 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.

Click PDF for Technical Specification


Engineer's Steel Straight Edges

We provide our clients with Engineer’s steel straight edges. These are widely used for checking straightness and marking purposes. Steel straight edges are made using high quality steel and are available in hardened and unhardened form. Our steel straight edges are hand scrapped or lapped to achieve the desired accuracy as per standards. Light in weight, design of these straight edges make them ideal to use in various   industries such as Glass, Fabrication and windmill. The Engineer’s steel straight edges of bigger size are provided with milling slots to reduce weight. Our Steel Straight edges are supplied with computerized calibration certificate traceable to National Physical   Laboratory (NPL, Govt Of India ) New Delhi.


Standard sizes and accuracy of Luthra Engineer’s Steel Straight Edges as per IS:2220-1990,  Grade-1




Dimensions
L X B X H
mm
Straightness Microns
um
Parallelism Microns
um
300 x 35 x 8 12 24
450 x 35 x 8 12 24
600 x 50 x 8 15 30
1000x 50 x 8 21 42
1200 x 55 x 10 25 50
1500 x 65 x 12 29 58
2000 x 65 x 12 37 74
2500 x 65 x 12 46 92
3000 x 85 x 18 54 108
4000 x 100 x 20 71 142
5000 x 100 x 20 87 174
6000 x 120 x 20 100 200

*Other Sizes On Request

Prismatic (Triangular) Straight Edges

We offer quality prismatic straight edges that are used for checking angle and flatness of machine tools dovetailed guide ways, fixtures and slides. Triangular straight edge, two faces are scrapped and angle between the scrapped faces (30 or 45 or 60 Degree) is accurately processed. The third side is painted and recessed for weight reduction in the bigger sizes.


Some of its unique features are:


  • Luthra cast iron Prismatic Straight Edges are made of good quality closed grain cast iron strictly as per IS 210:1993 confirming to Grade FG-220.Castings are stress relieved either by natural ageing or by artificial seasoning.
  • Working surfaces are finished by hand scrapping to desired accuracy as per IS 8823:1978.
  • Provided with suitable M.S. handles on both end for easy lifting.
  • Offered in sizes with various working angles between working faces as shown in the table.
  • Prismatic   Straight edges are supplied with computerized calibration certificate traceable to National Physical   Laboratory   (NPL, Govt of India) New Delhi


Standard Size and accuracy of Luthra Triangular Straight Edges as per IS : 8823-1978, Grade-1




Length Angle between working Surfaces
(in Degrees)
Tolerance on Flatness of Working Surfaces
30 45 60
Millimeter
mm
Width of working surfaces 
mm
Microns
um
500 70 70 60 4
750 90 90 80 6
1000 110 110 100 8
1250 130 130 110 13
1500 130 130 110 13
2000 130 130 110 16


*Other Sizes On Request

Tool Maker's Knife Edges

Avail from us, a wide range of tool maker’s knife edges. These knife edges are manufactured from 100 mm to 500 mm length as per IS 3512:1966. Intended for very accurate work, these have one working edge, which is bevelled and very slightly rounded off. The working edge is finished either by grinding or lapping. We make use of high grade alloy steel in hardened form to design these edges. Further, our Knife edges are suitably heat treated to remove internal stress. Our Tool Maker’s knife edges are supplied with computerized calibration certificate traceable to National Physical   Laboratory   (NPL, Govt Of India ) New Delhi.


Standard Size and accuracy of Luthra Tool Maker's (knife Edge) as per IS 3512:1966, Grade 1


Dimensions
L X B X H
mm
Accuracy Microns
um
100 X 40 X 10 3
150 X 40 X 10 3
300 X 60 X 12 4
450 X 60 X 12 5
500 X 60 X 12 5

*Other Sizes On Request

Light Weight Aluminum Straight Edges

Aluminium straight edges are widely used in industries where along with accuracy weight is also important factor. Light weight feature of these aluminium straight edges make them easy to use especially when using longer straight edges this is undoubtedly of great significance. These straight edges are made of aluminium section with steel strip reinforced on working surfaces for better working and durability.


Each Luthra aluminium straight edges is provided with computerized calibration certificate traceable to NPL (Govt. Of India)



Standard sizes and accuracy of light weight aluminium straight edge As per Grade 1



Sizes
mm
Straightness Microns
um
Parallelism Microns
um
1000 21 42
1500 29 58
2000 37 74
2500 46 92
3000 54 108
4000 71 142
5000 87 174


*Other Sizes On Request

Granite Straight Edges

Luthra granite straight edges are produced from black granite. These granite straight edges are used for setting up machine bases by using spirit and electronic level and reference surface. Both the narrow working faces of granite straight edges are parallel and straight as per standards.  


Standard sizes and accuracy of granite straight edge as per Grade-1



Sizes
L x B x H
mm
Accuracy in Microns
um
Straightness Parallelism
1000x 150 x 75 10 10
1500 x 200 x 75 15 15
2000 x 200 x 75 20 20

*Other Sizes On Request

Luthra Engineering Works

Mr. Gaurav Luthra (Proprietor)
Luthra House, Delhi Road
Sonipat - 131001
Haryana, India
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