IS 6343:1971 is the Indian Standard (BIS) for floor springs (hydraulic) for doors. This standard specifies the requirements for materials, dimensions, manufacture, performance, and testing of hydraulically regulated floor springs. It covers three sizes (light, medium, and heavy) intended for controlling the closing of single and double action doors without a hold-open feature.
Specifies requirements for hydraulic floor springs used for automatically closing doors.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Endurance Test Cycles | 100,000 cycles (for all types) | 500,000 cycles (mandatory minimum) | EN 1154:1996 |
| High-Grade Endurance Test | 100,000 cycles (for 'Heavy Duty') | 2,000,000 cycles (for 'Grade 1') | ANSI/BHMA A156.4-2019 |
| Classification Method | By door dimensions: Light (<205x80 cm), Medium (<210x90 cm), Heavy (<240x100 cm) | By closing moment (torque) at the spindle: Power Size 1-7 | EN 1154:1996 |
| Latch Control | A check action is required to bring the door to a close 'gently and positively'. | Adjustable latching action is a separate function, with specific test requirements for closing against a simulated latchbolt. | EN 1154:1996 |
| Overload Test | A static load test on the spindle and arm is specified. | A dynamic overload test is performed by forcing the door to close against an obstruction multiple times. | EN 1154:1996 |
| Operating Temperature Range | Not defined with performance criteria. Hydraulic oil specified for 'normal climatic conditions'. | Device must meet performance criteria at -15°C and +40°C. | EN 1154:1996 |
| Corrosion Resistance | A general requirement for protective finish is mentioned. | Mandatory salt spray test (e.g., 96 hours for Grade 3) with defined success criteria. | EN 1154:1996 |