We are one of the well-known manufacturers of cast iron straight edges that are widely used for erection, commissioning and levelling 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 ageing 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 computerised calibration certificate traceable to National Physical   Laboratory   (NPL, Govt Of India ) New Delhi.

Click PDF for Technical Specification

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 computerised 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

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 computerised 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
Millimetre 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

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 computerised 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

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 computerised 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

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