The standard defines the technical criteria for fanlight pivots, also called ventilator hinges, used in door and window assemblies. It details the required materials, dimensions, workmanship, marking, packaging, and sampling methods for pivots fabricated from mild steel, aluminum alloys, and brass. This specification supports manufacturers, suppliers, and engineers in ensuring product reliability, compatibility, and adherence to Indian construction hardware standards.
Overview
The standard defines the technical criteria for fanlight pivots, also called ventilator hinges, used in door and window assemblies. It details the required materials, dimensions, workmanship, marking, packaging, and sampling methods for pivots fabricated from mild steel, aluminum alloys, and brass. This specification supports manufacturers, suppliers, and engineers in ensuring product reliability, compatibility, and adherence to Indian construction hardware standards.
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Frequently Asked
IS 1837:1966 permits fanlight pivots to be manufactured from the following materials with specified properties:
| Material Category | Requirements | Representative Grades |
|---|---|---|
| Mild Steel Sheet | Must pass a bend test without cracking when folded cold; internal bend radius equals thickness | St-42-S as per IS:226-1962 |
| Aluminium Alloy | Complies with casting and sheet standards outlined by IS:617-1959 and IS:737-1955 | Grades A-5-M, A-6-M; HS 20 WP; NS 4-3/4 H |
| Brass Sheets (Rolled) | Cu content 58-60%, Pb max 0.3%, tensile strength minimum 28 kg/mm², elongation at least 30%, hardness up to 75 (Pyrimid scale) | BS 60 as per IS:410-1959 |
| Brass Sheets (Cast) | Cu content 64-70%, Pb 1-3%, tensile strength minimum 19 kg/mm², elongation minimum 12% | Grade 3 as per IS:292-1961 |
These material specifications ensure the durability and functional reliability of the fanlight pivots.
According to IS 1837, fanlight pivots are categorized into Type 1, Type 2, and Type 3, each with specific dimensional requirements detailed in Tables 2 and 3. Key dimensions A through H and diameters (D, F, H) are defined in millimeters and relate to the pivot's designation number. The thicknesses of ventilator shutters for which these pivots are suitable range between 25 mm and 35 mm.
For example, designation number 1 for Type 1 pivots includes measurements such as A = 20.0 ± 0.5 mm, B = 50.0 ± 0.5 mm, C = 3.0 ± 0.1 mm, and D diameter = 9.5 ± 0.2 mm, designed for a ventilator shutter thickness of 25 mm. Higher designation numbers correspond to larger dimensions and thicker ventilator shutters.
Per Clause 6.1 of IS 1837, each fanlight pivot must bear a clear and permanent marking of the manufacturer's name or trademark. This marking facilitates traceability and quality assurance. Additionally, the application of the ISI Certification Mark is optional but recommended to indicate conformity with Indian Standards under ISI certification supervision. These markings ensure easy identification and compliance verification of the product.
Fanlight pivots should be free from any defects such as cracks, burrs, or surface imperfections as specified in Clause 5.1 of the standard. All sharp edges must be smoothly removed to enhance safety and ease of installation. The pivots must conform to the dimensional tolerances laid out in the relevant tables and figures. While the standard does not explicitly describe the surface finish, it implies a smooth finish suitable for functionality and durability, including options like bright, natural, anodized, or satin finishes depending on the material.
The standard specifies that all fanlight pivots of the same type, designation, and material within a consignment form a lot. Sampling sizes depend on the lot size, for instance: up to 200 units require a sample of 15 with zero permissible defective units; lots of 201-300 require 20 samples allowing one defective, and so forth, as detailed in Table 4.
Samples are randomly selected from at least 10% of the packages, with a minimum of three packages represented, ensuring equal numbers from each. All sampled pivots undergo inspection for dimensional accuracy and workmanship. A lot is accepted if the number of defective pivots does not exceed the permissible limit; otherwise, it is rejected. This statistical approach ensures consistent quality control.
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