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Manhole Covers & Frames

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This Product range includes various types of Cast Iron Manhole Cover & Frames (Light Duty, Medium Duty, and Heavy Duty), Gratings, Heavy Duty and Light Duty Recessed Cover and other castings as per Buyer’s requirements.

Our Products are compliant to the requirements of various specifications mainly BS-497/76, BS-EN-124, DIN, ASTM. UNICAST INDIA is BSI registered an ISO 9001: 2000 certified company. Besides this, Company has been consistently given feedback by its ever satisfied customers. The approval certificates can be made available to our customers on request.

Special Measures for Manhole Covers & Frames
  • Installation: During installation the frames are properly leveled to prevent rocking and lateral movement of the frame. Fixing instructions are provided with some designs and these should always be followed. In case of water tight and more particularly pressure tight designs, it is remembered that unless care is taken in the choice and application of the bedding medium for the frame sections, water penetrations of the bedding may result thus defeating the purpose of application of the product.
  • Protective Coating: All covers and frames supplied are coated with a black bituminous paint, unless specified otherwise. The coating is in accordance with BS 497 –76 requirements.
  • Surface Finish: All solid top cast iron covers are manufactured with a non-slip surface to provide adequate grip, the design of which may vary according to pattern in use.
  • Test Certificates: Test certificate can be supplied against special request.
  • Test Load Specification for BS-497/76



Product Grade (Loading)Test Load in kNBlock size in mm for Load Test
BS - 497-76
LoadingCast IronManhole Covers
A350300 mm. Dia
B150300 mm. Dia
C10300 mm. Dia
D400250 mm. Dia
Product Grade (Loading)Test Load in kNClear Opening (mm.)
BS - EN-124
LoadingCast Iron300 to 1000 mm200 to 300 mm.Below 200 mm.
A 1515250250 X 150150
B 125125250250 X 150150
C 250250250250 X 150150
D 400400250250 X 150150
E 600600250250 X 150150
F 900900250250 X 150150

Instrument Castings

The Unit also produce many Instruments Castings such as Flange Clamps and Aligning Rings for Ash slurry line, Jute machinery parts like Gabbles, Bearer. The Instrument Castings are mainly in Grade casting and in Composition castings. In case of Grade Castings the Results are given below.

Mechanical Test Requirements:


GradeU.T.S Min Mpa (N/mm2)Hardness (BHN)
FG 150150130 to 180
FG 200200160 to 220
FG 220220180 to 220
FG 260260180 to 230
FG 300300180 to 230
FG 350350207 to 241
FG 400400207 to 270
ASTM A-159 ,G 30003000Psi Min187 - 241
ASTM A-159 ,G 40003000Psi Min217 - 269

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