The IS 364:1993 standard delineates specifications for fanlight catches utilized mainly in ventilators and fanlights within buildings. It details requirements pertaining to materials, dimensions, manufacturing standards, surface finishes, marking, and sampling inspection procedures for catches made from mild steel, aluminium alloy, and cast brass. This code is crucial for producers, vendors, and engineers to guarantee product reliability, performance, and adherence to Indian building norms.
Overview
The IS 364:1993 standard delineates specifications for fanlight catches utilized mainly in ventilators and fanlights within buildings. It details requirements pertaining to materials, dimensions, manufacturing standards, surface finishes, marking, and sampling inspection procedures for catches made from mild steel, aluminium alloy, and cast brass. This code is crucial for producers, vendors, and engineers to guarantee product reliability, performance, and adherence to Indian building norms.
Audience
Contents
Structure
This section outlines the purpose of the standard, establishing the specifications for fanlight catches and methods to assess their conformity. It also includes sampling sizes and acceptance thresholds based on lot quantities, following rounding conventions as per IS 2:1960. The section references relevant material standards such as IS 280, IS 292, IS 617, IS 733, IS 1079, and IS 4905 to ensure comprehensive quality control.
This part lists the Indian Standards referenced within IS 364, detailing the material specifications and sampling methodologies critical to compliance. Standards include those for mild steel wire, brass ingots, aluminium alloys, carbon steel sheets, and random sampling techniques. It also emphasizes the rounding off procedures and the regulatory framework for the use of the BIS Standard Mark.
Defines the various types of fanlight catches covered—mild steel (potentially stove enamelled), aluminium alloy, and cast brass. It specifies typical design parameters such as catch size, spring coil details, and screw hole dimensions, along with the associated dimensional tolerance limits to ensure precise manufacturing and fit.
Details the material standards applicable to fanlight catches including mild steel wire, aluminium and its alloys, and leaded brass, referencing respective IS codes. It also explains the sampling plan and acceptance criteria based on lot size to maintain consistent material quality.
Specifies the permissible dimensional variations for fanlight catches, categorized by measurement ranges. This section also reiterates the sampling sizes and acceptance limits for inspecting dimensional conformity, ensuring manufacturing precision.
Outlines the quality standards related to production processes, including inspection for defects such as cracks and surface irregularities, smooth operation of moving parts, and adherence to sampling and acceptance criteria to verify workmanship quality.
Describes finish requirements, such as stove enamelling for mild steel catches and anodizing for aluminium alloys with specified minimum coating thicknesses. It includes quality control procedures related to finish and the sampling acceptance framework.
Covers marking provisions, including the optional application of the BIS Standard Mark on fanlight catches to indicate compliance. It also specifies sampling and acceptance criteria for marking quality and adherence to BIS regulations.
Details packaging instructions based on material type, such as paper wrapping for mild steel and brass catches and tissue or polythene wrapping for aluminium alloy catches. Cartons must be labeled with manufacturer information, product type, and quantity, ensuring traceability and protection.
Explains the statistical sampling methodology for lot inspection, including sample sizes relative to lot quantities and the maximum allowable defects for acceptance. It highlights the random selection process and rounding rules for test results as per IS 2:1960.
Provides a comprehensive list of Indian Standards cited by IS 364 concerning materials and testing methods, such as IS 280, IS 292, IS 617, IS 733, IS 739, IS 1079, IS 4454, and IS 4905. This annex facilitates cross-referencing for detailed material and procedural requirements.
Lists the members of the Builders Hardware Sectional Committee responsible for the formulation of IS 364, including chairpersons, representatives from government agencies, industry, and research institutions, along with the member secretary from BIS. It highlights the collaborative effort ensuring the standard's relevance and enforcement.
Frequently Asked
IS 364 mandates the use of specific materials for fanlight catches, including cast brass conforming to the LCB-2 grade of IS 292:1983, aluminium alloy designated as 5230-M under IS 617:1975, and mild steel of general engineering quality. These material specifications ensure that fanlight catches are durable and suitable for building hardware applications.
As per Clause 5.1 of IS 364, dimensional tolerances are categorized based on size: ±0.2 mm for dimensions up to 5 mm, ±0.5 mm for dimensions over 5 mm up to 25 mm, and ±1.0 mm for dimensions exceeding 25 mm. These tolerances apply to key dimensions such as spring coil inner diameter and catch size to guarantee proper fit and function.
Quality evaluation involves verifying dimensional accuracy, inspecting for manufacturing defects like cracks or burrs, confirming smooth and stable plunger operation, and assessing surface finish uniformity. Packaging is also scrutinized to ensure proper wrapping and labeling. Any failure in these checks results in the fanlight catch being classified as defective.
For aluminium alloy fanlight catches, IS 364 stipulates anodizing after fabrication with a minimum anodic coating thickness of 0.015 mm for general use and 0.025 mm for outdoor exposure, with options for transparent or dyed finishes utilizing lightfast colors. Brass catches should have a satin finish or a finish specified by the purchaser to ensure aesthetic quality and corrosion resistance.
Sampling size depends on the lot quantity, ranging from 13 samples for lots up to 100 units to 80 samples for lots exceeding 1,000 units, selected randomly per IS 4905:1968. The acceptance number of defective units varies correspondingly, from zero defects allowed in small lots to a maximum of five in large lots. Lots exceeding these defect limits are rejected to maintain product quality.
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