The IS 3843:1995 standard outlines the specifications for steel back flap hinges used in building and construction hardware. It defines two categories—light and heavy duty hinges—covering their dimensions, material requirements, manufacturing standards, finishes, and testing procedures. This code serves as a vital reference for manufacturers, engineers, and quality assurance professionals to ensure hinges meet Indian regulatory standards for performance and durability.
Overview
The IS 3843:1995 standard outlines the specifications for steel back flap hinges used in building and construction hardware. It defines two categories—light and heavy duty hinges—covering their dimensions, material requirements, manufacturing standards, finishes, and testing procedures. This code serves as a vital reference for manufacturers, engineers, and quality assurance professionals to ensure hinges meet Indian regulatory standards for performance and durability.
Audience
Contents
Structure
IS 3843 defines the requirements for steel back flap hinges, including dimensions, tolerances, and quality conformity. It provides detailed tables specifying parameters such as length, width, thickness, and pin diameter along with allowable variances. Sampling and conformity evaluation procedures are also outlined, with rounding-off rules in accordance with IS 2:1960.
This section includes references to related Indian Standards critical for materials and hardware specifications, such as IS 2062 for structural steel and IS 1367 for bolts and screws. It highlights the importance of adhering to these standards to ensure proper material grades and mechanical properties.
Details on the types of steel back flap hinges (lightweight and heavyweight) with comprehensive dimension tables specifying size, length, breadth, thickness, pin diameter, knuckle width, number of screw holes, and screw size to maintain consistency and interchangeability.
Specifies the steel grades for hinge components: structural steel grades for the flap and mild steel wire for the pin, referencing appropriate IS codes to assure strength, flexibility, and durability.
Provides permissible tolerance ranges for all key hinge dimensions including length, breadth, thickness, pin diameter, and knuckle width for both lightweight and heavyweight hinges, ensuring manufacturing precision.
Defines acceptance thresholds for production lots based on defect counts, with sampling plans and criteria for acceptance or rejection to maintain product quality consistency.
Describes finish requirements for hinges including material treatments and coatings to prevent corrosion, extending the service life of the hardware.
Outlines marking requirements for traceability including manufacturer identification and standards compliance markings to facilitate quality control and product verification.
Specifies packaging quantities based on hinge sizes and mandates packaging in multiples of five when requested, ensuring safe transport and preservation of product quality.
Details sampling methods for lot inspection, acceptance and rejection criteria using statistical sampling plans to confirm conformity with the standard.
Enumerates the IS codes referenced by IS 3843 relevant to materials, fasteners, and testing methods, emphasizing the need to consult these standards for complete technical details.
Provides information about the technical committee responsible for drafting IS 3843, including key clauses related to testing and sampling protocols.
Frequently Asked
IS 3843 specifies that the flap of the hinge should be made from structural steel conforming to Grade A of IS 2062:1992, Grade O of IS 1079:1988, or tempered steel of grades H/2 or H/4 as per IS 513:1994. The hinge pin must be produced from mild steel wire meeting Grade H/2 or H/4 of IS 280:1978, ensuring adequate mechanical strength and durability.
The standard dimensions vary for lightweight and heavyweight steel back flap hinges with specific size ranges. Lengths range from 20 mm to 75 mm, breadths from 70 mm to 166 mm, thickness between 1.6 mm to 2.4 mm, and pin diameters from 3.15 mm to 5.00 mm. Tolerances are typically ±0.5 mm for length, ±1 mm for breadth, and smaller allowances for thickness and pin diameter as detailed in IS 3843 Tables 1 and 2.
According to IS 3843 Clause 6.4, the centerline of screw holes must be parallel to the hinge pin. Hinges with two holes have holes aligned in a single straight line, whereas those with more than two holes are arranged triangularly. The distances from the hinge ends and between holes depend on the hinge size, with standard wood screws of countersunk head conforming to IS 6760:1972 recommended for fastening.
Sampling involves randomly selecting hinges from at least 10% of packages, with a minimum of three hinges per package, following IS 4905:1968 methods. Inspections cover dimensions, workmanship, and finish quality. Acceptance of a lot depends on defectives being less than or equal to the acceptance number specified in IS 3843 Table 4; lots with defectives equal to or exceeding the rejection number are rejected.
Each hinge should be marked with the manufacturer's name or trademark for traceability and to demonstrate compliance with the standard. Packaging must protect the hinges from damage and preserve their finish and dimensions during transport. Hinges are packed in quantities based on size, typically 30 pieces per pack for sizes up to 25 mm and 10 pieces per pack for sizes above 25 mm, with packaging in multiples of five available upon purchaser request.
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