The 2009 edition of IS 15833 outlines the standards for stainless steel barrel-type tower bolts, which are mainly used for securing doors, windows, and furniture in corrosive-prone environments. This code defines the required dimensions, materials, construction details, marking, packaging, and quality verification parameters for stainless steel tower bolts made from specified grades. It is crucial for producers, suppliers, and engineers looking for corrosion-resistant, durable hardware suitable for humid and coastal locations.
Overview
The 2009 edition of IS 15833 outlines the standards for stainless steel barrel-type tower bolts, which are mainly used for securing doors, windows, and furniture in corrosive-prone environments. This code defines the required dimensions, materials, construction details, marking, packaging, and quality verification parameters for stainless steel tower bolts made from specified grades. It is crucial for producers, suppliers, and engineers looking for corrosion-resistant, durable hardware suitable for humid and coastal locations.
Audience
Contents
Structure
IS 15833 covers the specifications for stainless steel barrel-type tower bolts, defining minimum dimensions and essential requirements (Clause 10.0). Illustrative bolt shapes in Figure 1 are non-mandatory, but dimensional parameters are compulsory. Key dimensional data for different bolt sizes (Clause 3.2) are provided, including bolt length, barrel length, barrel width, bolt diameter, socket length, steel thickness, bore diameter, and minimum number of screw holes ensuring secure installation. Tolerances for these dimensions are also specified.
The standard incorporates references to related Indian Standards essential for materials and fasteners, such as IS 6527 (stainless steel wire rods), IS 6760 (slotted countersunk head wood screws), and IS 6911 (stainless steel plates, sheets, and strips). These referenced standards form an integral part of IS 15833 and provide detailed material and fastener specifications.
Nominal sizes of tower bolts are designated by the length of the barrel (B) as per Clause 3.2. The standard specifies sizes of 100 mm, 150 mm, 200 mm, 250 mm, and 300 mm. Dimensions such as bolt length, barrel width, and bolt diameter vary with size and are detailed in Table 1. Tolerances for each dimension are provided, ensuring consistency and interchangeability of components.
Materials used for manufacturing tower bolts must comply with IS 6527 for stainless steel wire rods and IS 6911 for stainless steel plates and sheets. The standard outlines acceptable stainless steel grades, thickness ranges, and surface quality. Manufacturers are required to provide certificates confirming material compliance with Clause 4 requirements.
The construction of tower bolts should adhere strictly to the dimensional requirements. Bolt shapes illustrated are for guidance only, while actual dimensions and minimum requirements are mandatory. Quality control during manufacturing and assembly is emphasized. Sampling for conformity follows Clause 10.2 with specific lot sizes and sample quantities stipulated. Defective units beyond allowable limits result in lot rejection.
Detailed dimensions and tolerances for each size of stainless steel tower bolt are specified. Lengths of bolt and barrel, barrel width, bolt diameter, socket length, steel thickness, and bore diameter have defined permissible deviations. The bolt must be a single piece with a securely fixed knob. The surface must be polished bright and smooth to prevent corrosion and ensure proper functioning.
Stainless steel tower bolts should have a corrosion-resistant surface finish free from defects such as pits or cracks. Marking requirements follow the BIS Act 1986, whereby each carton must bear a label indicating the manufacturer’s name or trademark, bolt size, and quantity. Proper marking facilitates traceability and quality assurance.
Tower bolts are to be packed securely in cartons to prevent damage during transport. Each package must be clearly labeled with the manufacturer’s identity, bolt size, and quantity. All dimensions are provided in millimeters, and packaging must comply with regulatory standards to maintain product integrity.
Sampling for inspection is based on lot size as detailed in Clause 10.2 and Table 2. The sample size and allowable number of defective bolts are specified for different lot sizes. Inspection ensures only batches meeting quality criteria are accepted, while lots exceeding permissible defects are rejected to maintain standards.
A batch of tower bolts conforms to IS 15833 if defective units in the inspected sample do not exceed the permissible number indicated in Table 2. Manufacturers must provide certificates of compliance verifying adherence to material and dimensional requirements. Non-conforming lots must be rejected to uphold quality and safety.
The Builders' Hardware Sectional Committee, CED 15, oversees the standard. The committee includes representatives from BIS, government agencies, industry associations, and manufacturers. Sampling sizes and defective unit limits are reiterated in this annex to guide quality control practices.
Frequently Asked
IS 15833 (2009) specifies stainless steel grades according to IS 6911 for tower bolts, mainly X07Cr18Ni9 (equivalent to AISI 304) and X10Cr17Mn6Ni4N20, a nitrogen-strengthened grade. These materials ensure the required corrosion resistance and mechanical strength for durable tower bolts used in building applications.
Stainless steel tower bolts under IS 15833 come in nominal barrel lengths of 100 mm, 150 mm, 200 mm, 250 mm, and 300 mm. The standard specifies detailed dimensions such as bolt length, barrel width, and bolt diameter with allowable tolerances generally around ±0.5 mm for length and diameter. The construction requires single-piece bolts with polished bright surfaces.
Quality assessment involves verifying material conformity to specified stainless steel grades, dimensional accuracy within prescribed tolerances, and surface finish quality. Each raw material consignment is inspected per Clause 4, with bolts checked during production for dimensional and finish defects. Only bolts meeting all criteria are accepted, ensuring consistent product quality.
Manufacturers must mark cartons of stainless steel tower bolts with their name or trademark, bolt size, and quantity. Packaging should protect the bolts during handling and transport. Additionally, manufacturers must provide certificates confirming material compliance. Markings comply with the Bureau of Indian Standards Act, ensuring traceability and quality assurance.
Corrosion resistance testing is not compulsory under IS 15833 but may be performed if requested by the purchaser. The test method and requirements must be mutually agreed upon between buyer and manufacturer. Common testing methods include salt spray and electrochemical tests, allowing customization based on environmental conditions and client needs.
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