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IS 5416:2000 is the Indian Standard (BIS) for adjustable metal chairs for the use of typists and operators in telephone exchanges-specification. This standard specifies the requirements for materials, dimensions, construction, finish, and performance of adjustable metal chairs. These chairs are intended for use by typists, telephone exchange operators, and in similar office environments, focusing on ergonomic design and durability.
Adjustable metal chairs for the use of typists and operators in telephone exchanges-Specification
! The standard defines different test levels based on end-use (e.g., Level 1 for light domestic, Level 2 for general contract), which dictates the magnitude of forces and number of cycles for testing.
! Failure is not just catastrophic breakage; it also includes loosening of joints, structural instability, or significant permanent deformation after test completion.
! The shape and size of loading pads used to apply the force are standardized to ensure repeatable and comparable results across different labs.
BS EN 1335-1:2020 & BS EN 1335-2:2018BSI - British Standards Institution, UK (Adoption of European Norm)
HighCurrent
Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions & Part 2: Safety requirements
Specifies dimensions, safety, and durability for general office work chairs, which includes the scope of typist chairs.
ANSI/BIFMA X5.1-2017BIFMA - Business and Institutional Furniture Manufacturer's Association, USA
HighCurrent
General-Purpose Office Chairs - Tests
Provides performance and safety test methods for office seating, directly overlapping with the intent of IS 5416.
ISO 9241-5:1998ISO - International Organization for Standardization, International
MediumWithdrawn
Ergonomic requirements for office work with visual display terminals (VDTs) — Part 5: Workstation layout and postural requirements
Provides ergonomic principles for workstation design, including seating, which informed the purpose of IS 5416.
DIN EN 1335-1:2020DIN - Deutsches Institut für Normung, Germany
HighCurrent
Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions; German version EN 1335-1:2020
German national adoption of the European standard, essentially identical in technical content to the BS EN version.
Key Differences
≠IS 5416 is highly prescriptive, specifying materials like 'mild steel tubes' of a certain thickness. Modern standards like BIFMA X5.1 are performance-based, defining test outcomes (e.g., 'no loss of serviceability') regardless of the material used.
≠The dimensional requirements in IS 5416 provide a single range for all users. EN 1335-1 defines different chair 'Types' (e.g., Type A, B, C) with varying dimensions to better accommodate a wider range of body sizes (anthropometric data).
≠Durability testing in international standards is significantly more rigorous. BIFMA X5.1 specifies a Swivel Test of 120,000 cycles under load, whereas IS 5416 does not specify a cyclic swivel test at all.
≠IS 5416 is specific to 'typists and operators in telephone exchanges'. International standards have a broader scope, covering 'general-purpose office chairs' for a variety of tasks.
Key Similarities
≈All standards mandate a 5-point base (five-star base) with castors as a fundamental requirement for stability and mobility in an office environment.
≈The core principle of adjustability is common, with requirements for seat height adjustment, backrest height adjustment, and a tilting/adjustable backrest.
≈All standards include static load testing for the seat and backrest to ensure the chair can safely support the user's weight without structural failure.
≈The fundamental ergonomic goal is the same: to provide a stable, adjustable chair that supports a healthy posture and reduces fatigue during prolonged periods of seated work.
Parameter Comparison
Parameter
IS Value
International
Source
Seat Height Adjustment Range
420 mm to 550 mm
420 mm to 510 mm (for Type A chair)
BS EN 1335-1:2020
Base Requirement
Five prongs (legs) with a pitch circle diameter of 560 mm (min).
Five-star base is required. Test methods verify stability rather than mandating a specific diameter.
BS EN 1335-2:2018
Seat Static Load Test (Proof Load)
110 kgf (approx. 1079 N) for 1 minute
1500 N (approx. 153 kgf) for 1 minute
ANSI/BIFMA X5.1-2017
Backrest Static Load Test (Proof Load)
45 kgf (approx. 441 N)
1000 N (approx. 102 kgf)
ANSI/BIFMA X5.1-2017
Stability Test (Forward Overbalance)
Shall not overturn with a 10 kgf horizontal force at the front edge of the seat.
A 600 N vertical load is placed near the front, and the chair must not tip. (More complex test setup).
BS EN 1335-2:2018
Seat/Back Durability Cyclic Test
Drop a 50 kg sandbag on the seat 1000 times from 150 mm height.
100,000 cycles of a combined 102 kg force on the seat and 445 N force on the back.
ANSI/BIFMA X5.1-2017
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Seat Static Load (Test Level 2 - General Contract)1300 N
Back Static Load (Test Level 2 - General Contract)560 N
Seat Durability Cycles (Test Level 2 - General Contract)50000 cycles
Arm Downwards Static Load (Test Level 2 - General Contract)700 N
Leg Forward Static Load (All Levels)330 N
Tables & Referenced Sections
Key Tables
Table 1 - Schedule of Tests
Table 2 - Seat and Back Static Test Loads
Table 3 - Seat and Back Durability Test Cycles and Loads
Table 4 - Arm Static Test Loads
Key Clauses
Clause 5 - Seat and Back Static Load Test
Clause 6 - Seat Front Edge Static Load Test
Clause 8 - Seat and Back Durability Test
Clause 9 - Arm Durability Test
Clause 11 - Leg Forward Static Load Test
Frequently Asked Questions4
What is the purpose of the seat and back durability test?+
To simulate repeated loading during the chair's service life, checking for fatigue failure in the structure and joints (Clause 8).
How is the seat static load test performed?+
A specified vertical force is applied to the seat through a standardized loading pad for a defined duration to check for immediate structural failure (Clause 5).
Does this standard apply to office chairs with casters?+
Yes, it covers all types of seating. However, for ergonomic and performance requirements of office chairs, IS 15296 (based on BIFMA standards) is often used in conjunction.
What is the difference between Part 1 and Part 2 of IS 5416?+
Part 1 covers strength and durability testing (applying loads), while Part 2 covers stability testing (checking resistance to tipping over).