The 2009 edition of IS 281 outlines the specifications for mild steel sliding door bolts intended for use with padlocks, integral to securing doors and gates in building construction. It details material grades, dimensions, types, manufacturing methods, surface treatments, and acceptance criteria to guarantee durability and dependable function. This standard is vital for producers, distributors, and engineering professionals involved in the selection and quality control of sliding door hardware across India.
Overview
The 2009 edition of IS 281 outlines the specifications for mild steel sliding door bolts intended for use with padlocks, integral to securing doors and gates in building construction. It details material grades, dimensions, types, manufacturing methods, surface treatments, and acceptance criteria to guarantee durability and dependable function. This standard is vital for producers, distributors, and engineering professionals involved in the selection and quality control of sliding door hardware across India.
Audience
Contents
Structure
This section defines the extent of IS 281, specifying dimensions, materials, sampling, and acceptance criteria for mild steel sliding door bolts used with padlocks.
Lists all the referenced standards pertinent to sampling, material specifications, and dimensional requirements.
Describes the two primary types of sliding door bolts: plate type and clip/bolt type, including their size ranges and construction details.
Provides detailed dimensions with allowable tolerances for various bolt sizes and types, along with hole specifications.
Specifies material grades and standards for mild steel rods, sheets, and wire used in manufacturing sliding door bolts.
Outlines production processes, sampling plans, acceptance criteria, and assembly instructions for bolts and associated components.
Details acceptable finishing methods such as black stove enameling, bright finishes with rust preventative coatings, copper oxidation, and plating options.
Describes the labeling requirements for packaging, including manufacturer identification, type, size, and quantity, as well as Standard Mark usage.
Specifies packaging methods including wrapping materials and labeling to ensure safe transit and identification.
Presents the sampling plans and permissible defect limits based on lot sizes to ensure compliance with quality standards.
Elaborates on testing protocols including bend tests, tensile strength, and inspection procedures for product validation.
Expands on sampling methodologies, conformity thresholds, and additional dimensional criteria for quality assurance.
Lists the members and organizations comprising the Builder's Hardware Sectional Committee responsible for IS 281.
Frequently Asked
According to IS 281 (2009), sliding door bolts must be manufactured using mild steel sheets and plates conforming to Grade O of IS 1079 or Grade D of IS 513, both requiring compliance with the bend test specified in Clause 5.1.2. Mild steel rods should meet Grade Fe 410 W as per IS 2062, while steel wire components must have tensile strength between 450 to 650 MPa, conform to 1/4 H of IS 280, and pass the bend test in Clause 5.2.2. These material standards ensure the mechanical robustness and durability necessary for the bolts.
IS 281 covers two main categories of mild steel sliding door bolts: Type I, the plate type with lengths of 150, 200, 250, 300, 375, and 450 millimeters; and Type II, the clip or bolt type available in sizes 200, 250, 300, 375, and 450 millimeters. The clip type includes single flap and double flap hasp designs as illustrated in Figures 2A and 2B. These bolts are designed to ensure smooth sliding operation with countersunk screw holes for wood screws and must have all sharp edges removed for safety and functionality.
IS 281 specifies dimensional tolerances primarily in Clause 6 and Table 1. The length (A) of clip or bolt type sliding door bolts is allowed a tolerance of ±2 mm for sizes 200, 250, and 300 mm, and ±3 mm for 375 and 450 mm sizes. Plate type bolts have detailed tolerances for width, height, thickness, and hole placements as per Table 1 and Figures 1A and 1B. Screw holes must be countersunk to accommodate designated wood screws according to IS 451, and all edges and corners must be smoothly finished to facilitate proper installation and use.
IS 281 permits several finishing treatments for sliding door bolts to enhance corrosion resistance and appearance. The back plate, straps, and staple plates should be stove-enameled in black prior to assembly. The hasp and sliding bolt themselves may be finished with a bright surface coated with a thin rust preventative, or alternatively undergo copper oxidation as per IS 1378, or be nickel or chromium plated according to IS 1068, depending on purchaser specifications. All components must have smooth edges and corners, and screw holes must be countersunk for flush fixing.
The sampling and acceptance approach defined in IS 281 (Clause 1.2 and Table A-2) establishes sample sizes and defect limits based on the total lot size. For lots up to 200 bolts, 15 samples are inspected with zero defects allowed; for 201 to 300 bolts, 20 samples are checked allowing one defective; for 301 to 500 and 501 to 800 bolts, 30 and 40 samples respectively are inspected with up to two defects permitted; and for lots exceeding 800 bolts, 55 samples are evaluated allowing up to three defective bolts. This statistically driven sampling method balances inspection efficiency and product quality. Additionally, manufacturers must provide certificates of compliance and ensure products are properly labeled and packaged.
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