Single Cylinder vs Double Cylinder Floor Spring — Technical Comparison for Fabricators

Single Cylinder vs Double Cylinder Floor Spring — Technical Comparison for Glass Door Fabricators

Reviewed by Umang Garg · Founder, Tickr Overseas · 13+ years in glass hardware industry · Author profile

Selecting the correct floor spring type is one of the most common technical decisions a glass door fabricator or glazing contractor faces at the specification stage. The choice between a single cylinder and double cylinder floor spring determines how the door behaves in use — and getting it wrong creates callbacks, adjustment disputes, and unhappy clients. This technical comparison covers the mechanism, application logic, capacity considerations, and installation differences between the two types.

What is a Single Cylinder Floor Spring?

A single cylinder floor spring contains one hydraulic control cylinder. It controls door movement in one direction — the door swings open in a single direction and the hydraulic mechanism controls the return speed back to the closed position. This is the standard configuration for virtually all commercial glass entrance doors: the user pushes the door open, walks through, and the floor spring returns the door to the closed position at a controlled speed.

The single cylinder design is mechanically simpler, more compact, and generally lower in cost than the double cylinder equivalent. It is the correct specification for all doors that are only intended to swing in one direction.

What is a Double Cylinder Floor Spring?

A double cylinder floor spring contains two hydraulic control cylinders — one for each direction of swing. It allows the door to open in both directions and close with controlled return speed from either direction. This is required for two-way traffic applications where users approach from both sides of the door and need to push it open in either direction.

Double cylinder floor springs are mechanically more complex, physically larger in the pivot body, and require a higher capacity rating because the door weight load is applied from both directions of swing. The installation procedure is also more involved because the pivot adjustment must be calibrated for both directions.

Side-by-Side Technical Comparison

ParameterSingle CylinderDouble Cylinder
Door swing directionOne direction onlyBoth directions
Hydraulic cylinders12
Mechanism complexityStandardHigher
Physical pivot sizeCompactLarger (two cylinders)
Capacity ratingStandard per door weightRequires higher-rated unit
AdjustmentSingle direction speed adjustSeparate adjust for each direction
Installation complexityStandardMore involved
Typical costLowerHigher
Most common useGlass entrance doors, commercial offices, retailHospital corridors, restaurant pass-throughs, two-way traffic doors

When to Specify Single Cylinder

Single cylinder floor springs are the correct specification for the vast majority of glass door installations in India. Specify single cylinder when:

  • The door opens in one direction only — users enter from one side and exit through a different door or route
  • The door is at a commercial entrance, retail shopfront, office lobby, hotel entrance, or similar application where foot traffic flows in one primary direction
  • The door has an access control system or security requirement that restricts two-way swing
  • The project specifies standard commercial glass hardware without special two-way traffic requirements
  • You are matching replacement hardware to an existing single-action door installation

The Tickr floor spring range for single cylinder applications covers door weights from 90 kg (TCH-7400) to 200 kg (TCH-100 Hydraulic), spanning the full range from residential premium to heavy institutional glass doors.

When to Specify Double Cylinder

Double cylinder floor springs are a minority of glass door installations but are essential in the right application. Specify double cylinder when:

  • The door is in a two-way traffic corridor — hospital wards and theatre corridors, commercial kitchen pass-throughs, fire exit corridors where the door must open from either side
  • The project specification explicitly states bi-directional or double-action door operation
  • The door separates two occupied spaces where users from either side will push through without a dedicated entry and exit route
  • Fire and safety regulations for the specific building type require two-way egress through a single door opening

Note: double cylinder floor springs for glass doors are specialist specification items. Always confirm door weight, opening force requirements, and two-way traffic volume with the client before specifying double cylinder. Over-specifying a double cylinder on a door that will only ever swing one way adds cost and complexity without benefit.

Capacity Selection — Why It Matters More for Double Cylinder

For single cylinder floor springs, capacity selection follows a straightforward rule: the floor spring must be rated for a door weight equal to or greater than the actual door weight. A 90 kg door needs a floor spring rated at minimum 90 kg.

For double cylinder floor springs, the capacity requirement is higher for the same door weight because the hydraulic mechanism must control the return force from two directions. A 90 kg door on a double cylinder installation will typically require a floor spring rated at 100-120 kg to deliver consistent closing performance in both directions. Under-rating a double cylinder floor spring leads to irregular closing speed from different directions, progressive wear, and early mechanism failure.

When in doubt on double cylinder capacity selection, contact the Tickr team with door weight, door width, and two-way traffic volume — we will advise the appropriate specification.

Installation Differences

Single Cylinder Installation

The floor socket, pivot plate, and adjustment procedure are standard across the Tickr single cylinder range. The direction of closing is fixed at installation by the pivot pin orientation. Speed adjustment (main closing speed and latching speed) is accessible via the adjustment screws on the floor spring body after installation.

Double Cylinder Installation

Double cylinder installation uses the same floor socket dimensions as single cylinder for the same capacity range — the floor preparation is identical. However, the top pivot for a double cylinder installation is a centred top pivot (not offset), which is critical for balanced two-way swing. The closing speed adjustment must be set independently for each direction. Allow additional commissioning time on double cylinder installations to balance both directions to the client’s preference.

Common Specification Mistakes to Avoid

  • Installing single cylinder on a two-way traffic door: The floor spring will work correctly in one direction but will not assist controlled closing when the door is pushed from the reverse side. The door will either stay open or slam shut depending on the situation.
  • Under-rating double cylinder capacity: As discussed above, a double cylinder on a door at the rated capacity limit will degrade faster than a single cylinder in the same installation. Size up by at least one capacity tier for two-way applications.
  • Assuming any floor spring can be converted between single and double cylinder: Single and double cylinder floor springs are not interchangeable by the end user. The internal mechanism is fundamentally different. Specify correctly at the outset.
  • Forgetting to confirm top pivot type: Single cylinder installations use offset top pivots; double cylinder uses centred top pivots. Ordering the wrong top pivot with the floor spring creates a delay on site.

Tickr Floor Springs — Single and Double Cylinder Available

Tickr Overseas manufactures and supplies both single cylinder and double cylinder floor springs in India. The range is TUV-SUD certified, carries a 7-year manufacturer warranty, and is available for wholesale dealer supply, project bulk purchase, and individual unit procurement. The Tickr team can advise on specification for any glass door project across door weight, finish, and cylinder type requirements.

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