What are the different sizes of floor springs specified in this code?

The standard specifies three sizes: Size 1 (Light), Size 2 (Medium), and Size 3 (Heavy) as per Clause 3.1.

What is the required efficiency of a floor spring?

The efficiency must be a minimum of 60 percent when tested according to the procedure in Clause 8.2.4.

What is the specified time for a door to close?

The time of closing for the door from a 90° open position to fully closed shall be between 3 and 10 seconds (Clause 8.2.2).

Does this standard cover floor springs with a hold-open feature?

No, this standard is only applicable to hydraulically regulated floor springs of the non-hold-open type.

IS 6343

: 1971

Floor Springs (Hydraulic) for Doors

CurrentSpecializedSpecificationBIMArchitectural · Doors, Windows and Shutters

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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.

Quick Reference Values

Minimum Efficiency60 percent

Door Closing Time (from 90°)3 to 10 seconds

Initial Checking Action AngleEffective from at least 90°

Performance Test Cycles50,000 cycles

Allowable Leakage during TestNo leakage of oil

Practical Notes

Ensure the correct size (Light, Medium, Heavy) is chosen based on the door's weight and width, as the standard itself does not provide a selection chart.

Proper installation and alignment of the pivot point are critical for performance and longevity.

The standard is for non-hold-open types only; if a hold-open feature is required, a different or supplementary specification must be used.