The standard specifies the criteria for mild steel butt hinges utilized in building and construction hardware. It details the materials, dimensions, allowable manufacturing deviations, mechanical characteristics, marking, packaging, and sampling rules to guarantee quality and compliance. This specification is crucial for manufacturers, suppliers, and professionals involved with the design, selection, and fitting of steel butt hinges in doors, windows, and furniture.
Overview
The standard specifies the criteria for mild steel butt hinges utilized in building and construction hardware. It details the materials, dimensions, allowable manufacturing deviations, mechanical characteristics, marking, packaging, and sampling rules to guarantee quality and compliance. This specification is crucial for manufacturers, suppliers, and professionals involved with the design, selection, and fitting of steel butt hinges in doors, windows, and furniture.
Audience
Contents
Structure
This section outlines the application range of the standard, covering the dimensions and allowable tolerances for mild steel butt hinges of various categories such as Light Weight and Heavy Weight Types 1 & 2. It also provides essential tables for hinge measurements including length, breadth, flap thickness, pin diameter, knuckle count, and screw hole specifications.
Details the Indian Standards referenced by this code, including those for non-ferrous hinges, mild steel wire, steel sheets, and wood screws. It also explains the sampling methods and acceptance criteria for lots of hinges, with sample sizes and permissible defective quantities based on lot sizes.
Specifies the materials used for the components of the hinges, such as mild steel for flaps conforming to IS 1079 or IS 513, and mild steel wire for pins as per IS 280. This section also details material grades and mechanical property requirements.
Describes the various types of mild steel butt hinges covered by the standard, including Broad Type and Heavy Weight Types 1 and 2, along with their key dimensional parameters and tolerances.
Provides manufacturing dimension tables and tolerances for different hinge categories, elaborating on flap thickness, pin diameter, knuckles, and screw hole arrangements.
Focuses on the finish requirements of the hinges, emphasizing dimensional accuracy, tolerance adherence, and the impact of finishing on corrosion resistance and mechanical performance.
Specifies the marking requirements for easy identification including manufacturer’s name or trademark, hinge size and type, batch number, and the necessity for clear, durable, and legible marks.
Provides guidelines on packaging quantities depending on hinge size, packaging materials, and optional packing multiples as per purchaser’s requirements.
Defines lot formation, sampling procedures, acceptance criteria, and quality control measures to ensure hinges meet dimensional and quality standards, including actions to be taken if defects exceed permissible limits.
Enumerates the related IS standards referenced within the code, providing titles and revision details for each.
Offers an in-depth explanation of sampling sizes, acceptance limits, and dimensional specifications for different hinge types and sizes, along with notes on uncranked versus cranked hinge dimensions.
Frequently Asked
The standard mandates using mild steel for the hinge leaves complying with Grade O of IS 1079:1988 or IS 513:1986, and mild steel wire with a minimum of quarter hard temper per IS 280:1978 for the hinge pins. These specifications ensure the hinges possess the necessary durability and mechanical strength required for construction applications.
Dimensions and tolerances are detailed for different hinge types such as Heavy Weight Types 1 and 2, and Broad Type hinges. Lengths have a tolerance of ±0.5 mm, breadth ranges from ±1 to ±2 mm depending on size, flap thickness varies with tolerances between ±0.06 to ±0.10 mm, and pin diameter tolerance is ±0.08 mm. The number of knuckles is typically 3 or 5, and the screw holes range from 4 to 10 depending on hinge size and type, ensuring proper fit and interchangeability.
Screw holes must be aligned with their center lines parallel to the hinge pin. For heavy and medium hinges, two holes per flap are aligned in a single row, while more than two holes are arranged in an equidistant zig-zag pattern. Lightweight hinges with three or fewer holes have them in a single line; if more than three, the holes follow a zig-zag distribution. The minimum distances from flap edges vary by hinge size to maintain strength and aesthetics, and holes are countersunk to fit IS 6760 wood screws.
The standard defines a 'lot' as hinges of the same type, size, material, and manufacturing conditions. Samples are randomly drawn—usually at least 10% of packages with a minimum of three hinges per package—and tested for dimensional and quality compliance. The lot is accepted if the number of defective hinges does not exceed permissible limits specified by lot size, ensuring consistent product quality across batches.
Markings on hinges should clearly indicate the manufacturer's name or trademark, hinge size and type, and batch or heat number to ensure traceability. Markings must remain legible and durable after handling. Packaging should protect hinges during transportation and storage, typically using cardboard boxes or approved materials, with packing quantities varying by hinge size—commonly 30 pieces for smaller sizes, 20 for medium, and 10 for larger hinges. Packaging in multiples of six is permitted when requested by the buyer.
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