This standard outlines the specifications for metal office chairs featuring swivel and tilt functions, detailing requirements for dimensions, materials, construction methods, and performance standards. It is intended for manufacturers, designers, and quality inspectors to ensure ergonomic, robust, and safe office seating solutions.
Overview
This standard outlines the specifications for metal office chairs featuring swivel and tilt functions, detailing requirements for dimensions, materials, construction methods, and performance standards. It is intended for manufacturers, designers, and quality inspectors to ensure ergonomic, robust, and safe office seating solutions.
Audience
Contents
Structure
This section defines the extent of IS 3499 Part 2, covering steel office chairs with swivel and tilt actions. It specifies key dimensions, material types, and welding protocols. Test results must be rounded in accordance with IS 2-1960, maintaining the number of significant figures as required.
Key chair dimensions include an overall height of 785 mm and an overall width, including armrests, of 535 mm. The standard references related specifications for welding consumables, steel tubes for furniture, screws, and commercial timber classifications to ensure material and structural compatibility.
This part details the materials mandated for the construction of metal office chairs. Mild steel sheets must conform to Grade 0 of IS 513:1973 or IS 1079:1973. Aluminium tubing should meet IS 1285:1975 designations 62400, 63400, or 65032. Metal components must align with IS standards regarding filler rods, covered electrodes for arc welding, and resistance spot-welding electrodes to guarantee structural integrity.
Minimum overall chair dimensions are specified as 785 mm in height and 535 mm in width including armrests to ensure adequate ergonomic comfort. Aluminium tubes used in frames must comply with IS 1285-1975, and welding and finishing operations follow relevant IS codes. Dimensions must be rounded following IS 2-1960.
Metal chairs are comprised of frames, legs, armrests, seat and back supports, and welded joints, all constructed as per clauses 4.1 to 4.8 of the standard. Welding processes must adhere to IS standards for filler rods and electrodes. The overall dimensions include a minimum height of 785 mm and width of 535 mm including armrests. Test results require rounding as per IS 2:1960.
Assembly can be achieved through welding, bolting, or screwing. Aluminium welding complies with IS 2812-1964, gas welding with IS 1323-1966, arc welding with IS 816-1969, and spot welding with IS 819-1957. Electrodes used must conform to IS 1278-1972 (gas welding), IS 814 (Part 1)-1974 (arc welding), and IS 4972-1968 (spot welding). Proper surface preparation and welding sequences help ensure strong, distortion-free joints.
Surface treatment includes pickling followed by phosphating per Class C of IS 5618-1966 and IS 6005-1970. Filled surfaces use putty conforming to IS 110-1968, with aluminium primers as per IS 5660-1970. Final enamel coatings must meet IS 151-1950, IS 2932-1974, or IS 2933-1975. Corrosion resistance is verified by condensation tests according to IS 101-1964.
Test results are rounded according to IS 2-1960. Pressure testing uses mild steel samples of 0.315 mm thickness prepared per surface finish clauses, tested as per IS 101-1964 Clause 15.2. The criterion for acceptance is no exposure of metal surfaces after testing, ensuring joint integrity.
All chair components must be packaged to prevent damage during shipping. This includes cleaning and surface protection, use of cushioning materials like foam or bubble wrap, and sturdy outer packaging that resists environmental factors. Moisture barriers or desiccants are recommended to prevent corrosion, and components should be secured to avoid movement.
Purchasers should specify seat type (wooden, cushioned, or metal), backrest style (fixed or adjustable), requirement and type of castor units, finish color, and any alternative construction or finishing preferences. Metal chairs must bear the manufacturer's identification mark. Minimum overall dimensions, as detailed in clause 3.1.4, must be adhered to, and packaging should accommodate these sizes.
Frequently Asked
Per IS 3499 Part 2 (1985), the minimum overall height of metal office chairs with revolving and tilting features is 785 mm, the overall width including armrests is 535 mm, and the seat width measured at mid-depth must be at least 450 mm. The seat may be cushioned or caned in accordance with IS 5378-1969 to ensure ergonomic comfort.
The standard requires chairs to be constructed primarily from mild steel or stainless steel for frames and structural parts. Seat and backrest components may use metal sheets or frames combined with cushioning materials. Fasteners should be corrosion-resistant metals like steel or brass, and all surfaces must be treated with protective coatings such as enamel paint or powder coatings to ensure durability in office environments.
The revolving and tilting mechanism must incorporate a vertical axle enabling rotation and a horizontal axle for tilt movement, controlled by an adjustable spring system. The spring tension is modulated with a knob to vary the resistance to tilting. The mechanism must support a 150 kg load without wobbling during rotation or tilt, verified through load testing with repeated movements to ensure stability and safety.
Surface treatment involves thorough cleaning to remove burrs, grease, and rust, followed by pickling and application of a phosphate coating as per Class C of IS 5618-1966. Surfaces are then filled with putty (IS 110-1968), primed with aluminium primer (IS 5660-1970), and finished with one or more coats of enamel paint conforming to IS standards (IS 151-1950, IS 2932-1974, IS 2933-1975). Corrosion resistance is confirmed by condensation tests following IS 101-1964.
All parts must be packed to prevent mechanical damage and corrosion throughout transit. Components need to be cleaned and surface-treated before packaging. Use cushioning materials such as foam or bubble wrap, secure components to prevent movement, and enclose them in sturdy, weather-resistant boxes or crates. Including moisture barriers or desiccants is recommended to protect against environmental damage.
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