The 1993 edition of IS 363 outlines the standards for hasps and staples crafted from mild steel, brass, and aluminium alloys. It details material types, dimensions, manufacturing quality, and finishing criteria, serving manufacturers, suppliers, and quality inspectors engaged in producing and verifying these essential hardware components for construction and security.
Overview
The 1993 edition of IS 363 outlines the standards for hasps and staples crafted from mild steel, brass, and aluminium alloys. It details material types, dimensions, manufacturing quality, and finishing criteria, serving manufacturers, suppliers, and quality inspectors engaged in producing and verifying these essential hardware components for construction and security.
Audience
Contents
Structure
IS 363 defines the size, material composition, and permissible tolerances for hasps and staples intended for locking mechanisms.
Material grades are specified in Table 1, including extruded aluminium alloys, aluminium sheets, cast brass, mild steel, and various wires with respective IS references.
Dimensional details for different types and materials are provided in Tables 2 through 4, covering key parameters like length, thickness, hinge pin diameter, and screw hole configuration.
Sampling methodology for quality control testing is outlined in Clause 10.2.1, referencing lot size-dependent sample sizes per Table 5 and IS 4905:1968.
Rounding of measured values follows IS 2:1960 guidelines.
Key referenced standards include specifications for materials such as aluminium alloys, brass, mild steel, phosphor bronze, and sampling methods.
Material designations correspond to IS standards like IS 733, IS 737, IS 292, IS 1079, IS 280, IS 7608, IS 1285, IS 739, IS 1868, and IS 4905.
Dimensional tables cover mild steel and brass/aluminium alloy hasps and staples across various sizes and thicknesses.
Sampling and lot inspection criteria are based on IS 4905 and the lot sizes described in Table 5.
Table 1 lists approved Indian Standard grades for materials used in manufacturing hasps and staples, including extruded aluminium alloys (IS 733, IS 1285), aluminium alloy sheets (IS 737), cast brass (IS 292), mild steel (IS 1079), and wires (IS 280, IS 7608).
Dimensional specifications include thickness ranges, hinge pin diameters, and wood screw sizes for mild steel and brass/aluminium alloy hasps and staples (Types 1 and 2), detailed in Tables 2 to 4.
Sampling procedures aligned with lot sizes are described in Clause 10.2.1.
Dimensions and permissible deviations are specified in Tables 2, 3, and 4, with illustrations in Figures 1 and 2.
Examples include mild steel Type 1 hasps with length tolerances of ±2 mm, thickness tolerances of ±0.10 mm, and hinge pin diameter tolerances of ±0.05 mm.
Material grades for components such as mild steel and brass are reiterated from Table 1.
Sampling for inspection is conducted according to lot size and IS 4905:1968.
Materials must conform to the IS grades listed in Table 1.
Dimensional requirements for various types and materials of hasps and staples are provided in Tables 2 to 4.
Sampling for quality assessment follows Clause 10.2.1, with random selection according to IS 4905:1968.
An example dimensional summary is provided for mild steel Type 1 hasps.
Finishing requirements vary by material: mild steel hasps and staples must be stove-enamelled in black; brass components require oxidation or clear lacquer after polishing; aluminium alloys are anodized to at least Grade AC 10 per IS 1868.
Hinge pins use mild steel for mild steel hardware; mild steel or brass pins for brass/aluminium hardware; phosphor bronze pins permitted for brass if requested.
Corrosive environments warrant brass or phosphor bronze hinge pins.
All sharp edges must be deburred, and screw holes countersunk appropriately.
Marking may include the Standard Mark.
Packaging must be labelled with the manufacturer's name or trademark, quantity, description, size, and type of the hasps and staples.
Dimensional tolerances for various types are provided in Tables 2 to 4.
Sampling for inspection is based on lot size and procedural requirements in IS 4905:1968.
Hasps and staples should be packed in cartons or approved containers.
Packages require labels displaying manufacturer details, quantity, product description, and size/type.
Standard Mark usage is permitted.
Sampling for quality control is performed with random selection as per lot sizes defined in Table 5 and IS 4905:1968.
Sample sizes depend on lot size according to Table 5.
Random sampling is conducted as per IS 4905:1968.
A lot is deemed conforming if the number of defective items in the sample does not exceed the acceptance number specified in Table 5, Clause 10.4.
Dimensional checks are performed against Tables 2 to 4.
Acceptance sampling follows Table 5 which correlates lot size with sample size and allowable defective quantities.
Lots with defective counts less than or equal to the acceptance number are accepted; otherwise, they are rejected.
This method ensures adherence to quality standards via statistical sampling.
A comprehensive list of IS standards referenced includes IS 280, 292, 733, 737, 739, 1079, 1285, 1868, 4905, and 7608.
These cover material specifications, sampling methods, and finishing standards essential for compliance with IS 363.
Sampling and acceptance criteria are summarized in Table 5.
The composition of the committee responsible for IS 363 is outlined in Annex B.
Key aspects include lot size sampling per Table 5, material specifications as per Table 1, and dimensional requirements per Tables 2 to 4.
An excerpt of mild steel hasps and staples dimensions is provided as an example.
Frequently Asked
IS 363 allows the use of mild steel, brass, aluminium alloys, and phosphor bronze wires for hasps and staples. Specific grades include extruded aluminium alloy (IS 733:1983 or IS 1285:1975), aluminium alloy sheet (IS 737:1986), cast brass (IS 292:1983), mild steel (IS 1079:1988), mild steel wire (IS 280:1978), and phosphor bronze wire (IS 7608:1987). Hinge pins for mild steel components must be mild steel; for brass or aluminium alloy hardware, hinge pins can be mild steel or brass, with phosphor bronze pins allowed for brass upon purchaser request. Brass or phosphor bronze pins are recommended in corrosive environments. Finishes vary accordingly to ensure durability and corrosion resistance.
The standard dimensions and tolerances for hasps and staples are detailed in Tables 2 to 4 and illustrated in Figures 1 and 2 of IS 363. For mild steel Type 1 hasps and staples, lengths range from 90 to 175 mm with thickness between 2.00 and 2.24 mm (±0.10 mm), hinge pin diameters from 4.00 to 5.00 mm (±0.05 to 0.06 mm), and specific screw hole counts. Brass and aluminium alloy hardware have slightly different thickness and hinge pin ranges. The tolerances ensure precise fitting and functionality, with length tolerances typically ±1.5 to ±2 mm.
Hinge pins for mild steel hasps and staples must be made of mild steel. For brass and aluminium alloy hasps and staples, hinge pins may be of mild steel or brass, with phosphor bronze pins permitted for brass hardware if specified by the purchaser. In corrosive environments, brass or phosphor bronze hinge pins are advised. The pins must enable smooth, free, and stable movement without looseness or misalignment. Safety-type hasps require the hinge pin ends to be riveted and properly finished to prevent hazards.
IS 363 mandates specific finishing treatments based on material type to enhance corrosion resistance. Mild steel hasps and staples must be stove-enamelled with a black finish. Brass components are polished and then either oxidized or coated with clear lacquer as per purchaser requirements. Aluminium alloy items require anodizing to at least Grade AC 10 according to IS 1868:1982. Additionally, brass or phosphor bronze hinge pins are recommended in corrosive environments. Proper deburring of sharp edges and countersinking of screw holes are also essential to ensure durability.
Conformance to IS 363 is assessed by sampling hasps and staples based on lot size, as detailed in Table 5. Sample sizes vary from 13 to 80 items depending on the lot quantity. The number of allowable defective items within the sample is specified; if the defects do not exceed this acceptance number, the lot is accepted. Exceeding the allowable defective count results in lot rejection. Sampling procedures must follow random selection methods per IS 4905:1968, ensuring statistical quality control while avoiding 100% inspection.
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